TEA1532CT/N1,118-CUT TAPE - NXP SEMICONDUCTORS

1. General description

The GreenChip II is the second generation of controller ICs intended for green ﬂyback

Switched Mode Power Supplies (SMPS). Its high level of integration allows the design of a

cost effective power supply with a very low number of external components.

The TEA1532BT; TEA1532CT can also be used in ﬁxed frequency, Continuous

Conduction Mode (CCM) converter designs for low voltage and high current applications.

At low power (standby) levels the system operates in cycle skipping mode which

minimizes the switching losses during standby.

The special built-in green functions allow the efﬁciency to be optimum at all power levels.

This holds for quasi-resonant operation at high power levels, as well as ﬁxed frequency

operation with valley switching at medium power levels. At low power (standby) levels, the

system operates in cycle skipping mode with valley detection.

The proprietary high voltage BCD800 process makes direct start-up possible from the

rectiﬁed universal mains voltage in an effective and energy efﬁcient way. A second low

voltage, Bipolar CMOS (BICMOS) IC is used for accurate, high speed protection functions

and control.

The TEA1532BT; TEA1532CT enables highly efﬁcient and reliable supplies to be

designed easily.

2. Features

2.1 Distinctive features

nUniversal mains supply operation (70 V to 276 VAC)

nHigh level of integration resulting in a very low external component count

nFixed frequency Continuous Conduction Mode (CCM) operation capability

nQuasi-Resonant (QR) Discontinuous Conduction Mode (DCM) operation capability

2.2 Green features

nValley or zero voltage switching for minimum switching losses in QR operation

nCycle skipping mode at very low loads; input power < 300 mW at no-load operation for

a typical adapter application

nOn-chip start-up current source

2.3 Protection features

nSafe restart mode for system fault conditions

nZero current switch-on in QR mode

TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

Rev. 01 — 18 January 2007 Product data sheet

Product data sheet Rev. 01 — 18 January 2007 2 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

nUndervoltage protection (fold back during overload)

nIC OverTemperature Protection (OTP) (latched)

nLow and adjustable OverCurrent Protection (OCP) trip level

nSoft (re)start

nMains voltage-dependent operation-enabling level

nTEA1532CT: general purpose input for latched or safe restart protection and timing,

e.g. to be used for OverVoltage Protection (OVP), output short-circuit protection or

system OTP

nTEA1532BT: general purpose input for latched protection and timing, e.g. to be used

for OVP, output short-circuit protection or system OTP

nBrown-out protection

3. Applications

nAdapters and open frame ﬂyback power supplies. The device can also be used in all

applications that demand an efﬁcient and cost-effective solution up to 250 W.

4. Ordering information

Table 1. Ordering information

Type number Package

Name Description Version

TEA1532BT SO8 plastic small outline package; 8 leads; body width

3.9 mm SOT96-1

TEA1532CT

Product data sheet Rev. 01 — 18 January 2007 3 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

5. Block diagram

(1) Switch S3 is not controlled in the TEA1532BT (ﬁxed as drawn).

Fig 1. Block diagram

SUPPLY

MANAGEMENT

internal

supply UVLO start

Vmains(oper)(en)

VCC 1

GND S1

CTRL

OSCILLATOR

DCM

AND

CCM

DETECTION

LOGIC

BROWN-OUT

PROTECTION

soft

start

OVER-

TEMPERATURE

PROTECTION

UVLO Q

MAXIMUM

ON-TIME

PROTECTION

POWER-ON

RESET

−1

VALLEY

clamp

DRIVER

START-UP

CURRENT SOURCE

0.5 V

6SENSE

7DRIVER

coa047

5DEM

8DRAIN

OCP

LEB

blank

Istartup(soft)

∆Isc/∆t

0.63 V

VCC < 4.5 V Q

−50

TEA1532BT

TEA1532CT

Osc_Rdy

Duty_Max

SLOPE

COMPENSATION

5.6 V

control

detect

Ich

PROTECT

5.6 V

Idch

300 Ω

protect

detect

3 V

2.5 V

(1)

DCM and CCM

Product data sheet Rev. 01 — 18 January 2007 4 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

6. Pinning information

6.1 Pinning

6.2 Pin description

7. Functional description

The TEA1532BT; TEA1532CT is a controller for a compact ﬂyback converter with the IC

situated on the primary side. An auxiliary winding of the transformer provides

demagnetization detection and powers the IC after start-up; see Figure 3.

Fig 2. Pin conﬁguration: TEA1532BT and TEA1532CT (SOT96-1)

TEA1532BT

TEA1532CT

VCC DRAIN

GND DRIVER

PROTECT SENSE

CTRL DEM

001aaf068

Table 2. Pin description

Symbol Pin Description

VCC 1 supply voltage

GND 2 ground

PROTECT 3 protection and timing input

CTRL 4 control input

DEM 5 input from auxiliary winding for demagnetization timing

SENSE 6 programmable current sense input

DRIVER 7 MOSFET gate driver output

DRAIN 8 drain of the external MOS switch, input for start-up current and

valley sensing

Product data sheet Rev. 01 — 18 January 2007 5 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

The TEA1532BT; TEA1532CT can operate in multi modes; see Figure 4.

In QR mode, the next converter stroke is started only after demagnetization of the

transformer current (zero current switching), while the drain voltage has reached the

lowest voltage to minimize switching losses (green function). The primary resonant circuit

of primary inductance and drain capacitor ensures this quasi-resonant operation. The

design can be optimized in such a way that zero voltage switching can extend over most of

the universal mains range.

Fig 3. Basic conﬁguration

Fig 4. Multi mode and FF-CCM operation

coa048

CVCC

CVIN

TEA1532BT

TEA1532CT

Cycle

skip fixed FF-CCM

P (W)

coa049

(kHz)

125

Product data sheet Rev. 01 — 18 January 2007 6 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

To prevent very high frequency operation at lower loads, the quasi-resonant operation

changes smoothly in ﬁxed frequency Pulse Width Modulation (PWM) control.

In ﬁxed frequency continuous conduction mode, which can be activated by grounding

pin DEM, the internal oscillator determines the start of the next converter stroke.

In both operating modes, a cycle skipping mode is activated at very low power (standby)

levels.

7.1 Start-up, mains enabling operation level and undervoltage lock out

Refer to Figure 9 and Figure 10. Initially, the IC is self supplying from the rectiﬁed mains

voltage via pin DRAIN. Supply capacitor CVCC (at pin 1) is charged by the internal start-up

current source to a level of about 4 V or higher, depending on the drain voltage. Once the

drain voltage exceeds the Vmains(oper)(en) (mains-dependent operation-enabling level), the

start-up current source will continue charging capacitor CVCC (switch S1 will be opened);

see Figure 1. The IC will activate the power converter as soon as the voltage on pin VCC

passes the Vstartup level. At this moment the IC supply from the high voltage pin is stopped

(green function). The IC supply is taken over by the auxiliary winding of the ﬂyback

converter.

The moment the voltage on pin VCC drops below Vth(UVLO) (undervoltage lock out), the IC

stops switching and performs a safe restart from the rectiﬁed mains voltage. In the safe

restart mode the driver output is disabled and pin VCC voltage is recharged via pin DRAIN.

7.2 Supply management

All (internal) reference voltages are derived from a temperature compensated, on-chip

band gap circuit.

7.3 Oscillator

The ﬁxed frequency of the oscillator is set by an internal current source and capacitor.

7.4 Cycle skipping

At very low power levels a cycle skipping mode activates. An internal control voltage

(Vsense(max)) lower than 25 mV will inhibit switch-on of the external power MOSFET until

this voltage increases to a higher value; see Figure 5.

7.5 Current control mode

Current control mode is used for its good line regulation behavior.

The primary current is sensed across an external resistor and compared with the internal

control voltage. The driver output is latched in the logic, preventing multiple switch-on.

The internal control voltage is inversely proportional to the external pin CTRL voltage, with

an offset of 1.5 V. This means that a voltage range from 1 V to approximately 1.5 V on

pin CTRL will result in an internal control voltage range from 0.5 V to 0 V (a high external

control voltage results in a low duty cycle).

Product data sheet Rev. 01 — 18 January 2007 7 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

7.6 OverCurrent Protection (OCP)

The primary peak current in the transformer is measured accurately cycle-by-cycle using

the external sense resistor Rsense. The OCP circuit limits the voltage on pin SENSE to an

internal level equal to 1.5 V −VCTRL (see also Section 7.5). The OCP detection is

suppressed during the leading edge blanking period, tleb, to prevent false triggering

caused by the switch-on spikes.

7.7 Demagnetization (QR operation)

The system will be in Discontinuous Conduction Mode (DCM) (QR operation) when

resistor RDEM is applied. The oscillator will not start a new primary stroke until the previous

secondary stroke has ended.

Demagnetization features a cycle-by-cycle output short-circuit protection, which

immediately reduces the frequency (longer off-time), thereby reducing the power level.

Demagnetization recognition is suppressed during the ﬁrst tsup(xfmr_ring) time (typical

1.5 µs). This suppression may be necessary in applications where the transformer has a

large leakage inductance and at low output voltages or start-up.

7.8 Valley switching

Refer to Figure 6. A new cycle starts when the power switch is activated. After the on-time

(determined by the sense voltage and the internal control voltage), the switch is opened

and the secondary stroke starts. After the secondary stroke, the drain voltage shows an

oscillation with a frequency of approximately

where Lp is the primary self inductance of the transformer and Cd is the capacitance on

the drain node.

As soon as the oscillator voltage is high again and the secondary stroke has ended, the

circuit waits for the lowest drain voltage before starting a new primary stroke. This method

is called valley detection. Figure 6 shows the drain voltage, valley signal, secondary stroke

signal and the oscillator signal.

Fig 5. The Vsense(max) voltage as a function of VCTRL

VCTRL (V)

1 V

(typ)

0.52 V

1.5 V

(typ)

coa016

Vsense(max) (V)

cycle

skip

active

25 mV

2π× LpCd

××

------------------------------------------

Product data sheet Rev. 01 — 18 January 2007 8 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

In an optimum design, the reﬂected secondary voltage on the primary side will force the

drain voltage to zero. Thus, zero voltage switching is possible, preventing large capacitive

switching losses , and allowing high frequency operation, which

results in small and cost-effective magnetics.

7.9 Continuous Conduction Mode (CCM)

It is also possible to operate the IC in the so-called Fixed Frequency Continuous

Conduction Mode (FF CCM). This mode is activated by connecting pin DEM to ground

and connecting pin DRAIN to the rectiﬁed VI voltage; see Figure 12.

7.10 Adjustable slope compensation

A slope compensation function has been added at pin CTRL; see Figure 7. The slope

compensation function prevents sub-harmonic oscillation in CCM at duty cycles over

50 %. The CTRL voltage is modulated by sourcing a (non-constant) current out of

pin CTRL and adding a series resistor Rslopecomp. This increases the CTRL voltage

proportionally with the on-time, which therefore limits the OCP level. Thus, a longer

on-time results in a higher CTRL voltage. However, this increase in CTRL voltage will

actually decrease the on-time. Slope compensation can be adjusted by changing the

(1) Start of new cycle at lowest drain voltage.

(2) Start of new cycle in a classical PWM system at high drain voltage.

Fig 6. Signals for valley switching

---CV

×f××=





drain

secondary

stroke

mgu235

secondary

ringing

primary

stroke

valley

(2) (1)

secondary

stroke

oscillator

Product data sheet Rev. 01 — 18 January 2007 9 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

value of Rslopecomp. Slope compensation prevents modulation of the on-time (duty cycle)

while operating in FF CCM. A possible drawback of sub-harmonic oscillation can be

output voltage ripple.

7.11 Minimum and maximum on-time

The minimum on-time of the SMPS is determined by the Leading Edge Blinking (LEB)

time (typically 400 ns). The IC limits the on-time to a maximum time, which is dependent

on the mode of operation:

QR mode: When the system requires an ‘on-time’ of more than 25 µs, a fault condition is

assumed (e.g. CVCC removed). The IC stops switching and enters the safe restart mode.

CCM: The driver duty cycle is limited to 70 %. So the maximum on-time is correlated to

the oscillator time, which results in an accurate limit of the minimum input voltage of the

ﬂyback converter.

7.12 Soft start-up (pin SENSE)

To prevent transformer rattle at start-up or during hiccup, the transformer peak current is

slowly increased by the soft start function. This can be achieved by inserting a resistor

and a capacitor between pin SENSE (pin 6) and sense resistor Rsense. An internal current

source charges the capacitor to VSENSE =I

startup(soft) ×Rss (about 0.5 V maximum).

The start level and the time constant of the increasing primary current level can be

adjusted externally by changing the values of Rss and Css.

Fig 7. Slope compensation

001aaa830

CTRL −1

slope compensation

current

0.63 V

control

detect

5.6 V

RCTRL

Rsc

DM Vsense max)( Istartup soft)( Rss

×)(–

Rsense

---------------------------------------------------------------------------------------

τRss Css

×=

Product data sheet Rev. 01 — 18 January 2007 10 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

The charging current Istartup(soft) will ﬂow as long as the voltage on pin SENSE is

below approximately 0.5 V. If the voltage on pin SENSE exceeds 0.5 V, the soft start

current source will start limiting current Istartup(soft).AtV

startup, the Istartup(soft) current source

is completely switched off; see Figure 8.

Since the soft start current is supplied from pin DRAIN, the Rss value will not affect VCC

current during start-up.

7.13 Control pin protection

If the pin CTRL becomes open-circuit or is disconnected, a fault condition is assumed and

the converter will stop switching immediately. Operation recommences when the fault

condition is removed.

7.14 PROTECT and timing input

The PROTECT input (pin 3) is a multi-purpose (high-impedance) input, which can be used

to switch off the IC and create a relatively long timing function. As soon as the voltage on

this pin rises above 2.5 V, switching stops immediately. For the timing function, a current of

typically 50 µA ﬂows out of pin PROTECT and charges an external capacitor until the

activation level of 2.5 V is reached. This current source is only activated when the

converter is not in regulation, which is detected by the voltage on pin CTRL

(VCTRL < 0.63 V). A (small) discharge current is also implemented to ensure that the

capacitor is not charged, for example, by spikes. A MOSFET switch is added to discharge

the external capacitor and ensure a deﬁned start situation. For the TEA1532CT, the

voltage on pin CTRL determines whether the IC enters latched protection mode, or safe

restart protection mode:

•When the voltage on pin CTRL is below 0.63 V, the IC is assumed to be out of

regulation (e.g. the control loop is open). In this case activating pin PROTECT

(VPROTECT > 2.5 V) will cause the converter to stop switching. Once VCC drops below

Vth(UVLO), capacitor CVCC will be recharged and the supply will restart. This cycle will

be repeated until the fault condition is removed (safe restart mode).

•When the voltage on pin CTRL is above 0.63 V, the output is assumed to be in

regulation. In this case activating pin PROTECT (VPROTECT > 2.5 V), by external

means, will activate the latch protection of the IC: The voltage on pin VCC will cycle

between Vstartup and Vth(UVLO), but the IC will not start switching again until the latch

Fig 8. Soft start-up

Css

Rss

SENSE

Rsense

Iss

Vocp

start-up

mgu237

0.5 V

Product data sheet Rev. 01 — 18 January 2007 11 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

protection is reset. The latch is reset as soon as VCC drops below 4.5 V (typical value)

(this only occurs when the mains has been disconnected). The internal

overtemperature protection will also trigger this latch; see also Figure 1.

For the TEA1532BT the IC always enters the latched mode protection independent of the

voltage on pin CTRL.

A voltage higher than 3 V on pin PROTECT will always latch the IC. This is independent of

the state or the version of the IC.

7.15 OverTemperature Protection (OTP)

The IC provides accurate OTP. The IC will stop switching when the junction temperature

exceeds the thermal shutdown temperature. When VCC drops to Vth(UVLO), capacitor CVCC

will be recharged to the Vstartup level, however switching will not restart. Subsequently, VCC

will drop again to Vth(UVLO), etc.

Operation only recommences when VCC drops below a level of about 4.5 V (typically,

when Vmains is disconnected for a short period).

7.16 Brown-out protection

During the so called brown-out test, the input voltage is slowly decreased. Since the

on-time depends on Vi, long on-times at low Vi can damage the (external) power device.

This is prevented by stopping the converter when the input voltage drops too low.

When the voltage on pin DEM drops below −50 mV during the on-time (QR mode), the

maximum on-time is set to 25 µs. The maximum on-time will be reached while Vi is low.

Subsequently, the IC stops switching and VCC drops below Vth(UVLO). Capacitor CVCC will

only be recharged and the supply will restart only when voltage VI is high enough

(Vmains(oper)(en), also see Section 7.1). In addition to this, a VI level at which the converter

has to enter a safe restart can be set with a demagnetization resistor. During the primary

stroke, the rectiﬁed mains input voltage is measured by sensing the current drawn from

pin DEM. This current depends on the mains voltage, according to the following equation:

Where: (ratio of the number of auxiliary to the number of primary windings)

The latter function requires an on-time of at least 2 µs. This on-time ensures that a reliable

demagnetization current can be measured.

When pin DEM is grounded (CCM), the brown-out protection is disabled. In this case the

duty cycle is limited to 0.7, so at low mains voltage the on-time is limited and therefore the

dissipation in the FET is limited.

7.17 Driver

The driver circuit to the gate of the power MOSFET has a current sourcing capability of

typically 170 mA and a current sink capability of typically 700 mA. This permits fast

turn-on and turn-off of the power MOSFET for efﬁcient operation.

DEM Vaux

RDEM

---------------NV

mains

RDEM

----------------------------

≈≈

NNaux

------------

Product data sheet Rev. 01 — 18 January 2007 12 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

A low driver source current has been chosen to limit the ∆V/∆t at switch-on. This reduces

ElectroMagnetic Interference (EMI) and also limits the current spikes across Rsense.

8. Limiting values

[1] Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.

[2] Equivalent to discharging a 200 pF capacitor through a 0.75 µH coil and a 10 Ω resistor.

9. Thermal characteristics

Table 3. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol Parameter Conditions Min Max Unit

Voltages

VCC supply voltage continuous −0.4 +20 V

VPROTECT voltage on pin PROTECT continuous −0.4 +5 V

VCTRL voltage on pin CTRL −0.4 +5 V

VDEM voltage on pin DEM current limited - - V

VSENSE voltage on pin SENSE current limited −0.4 - V

VDRAIN voltage on pin DRAIN −0.4 +650 V

Currents

ICTRL current on pin CTRL d < 10 % - 50 mA

IDEM current on pin DEM −1000 +250 µA

ISENSE current on pin SENSE −1 +10 mA

IDRIVER current on pin DRIVER d < 10 % −0.8 +2 A

IDRAIN current on pin DRAIN - 5 mA

General

Ptot total power dissipation Tamb <70°C - 0.5 W

Tstg storage temperature −55 +150 °C

Tjjunction temperature −20 +145 °C

ESD

VESD electrostatic discharge

voltage class 1

human body model pins 1 to 7 [1] - 2000 V

pin 8 (DRAIN) [1] - 1500 V

machine model [2] - 200 V

Table 4. Thermal characteristics

Symbol Parameter Conditions Typ Unit

Rth(j-a) thermal resistance from junction to

ambient in free air 150 K/W

Product data sheet Rev. 01 — 18 January 2007 13 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

10. Characteristics

Table 5. Characteristics

Symbol Parameter Conditions Min Typ Max Unit

Start-up current source (pin DRAIN)

IDRAIN current on pin DRAIN VDRAIN > 100 V

VCC = 0 V 1.0 1.2 1.4 mA

with auxiliary supply - 100 300 µA

VBR breakdown voltage 650 - - V

Vmains(oper)(en) mains-dependent

operation-enabling

voltage

60 - 100 V

Supply voltage management (pin VCC)

Vstartup start-up voltage 10.3 11 11.7 V

Vth(UVLO) undervoltage lockout

threshold voltage 8.1 8.7 9.3 V

Vhys hysteresis voltage Vstartup −Vth(UVLO) 2.0 2.3 2.6 V

Ich(high) high charging current VDRAIN > 100 V;

VCC <3V −1.2 −1−0.8 mA

Ich(low) low charging current VDRAIN > 100 V;

3V<V

CC <V

th(UVLO)

−1.2 −0.75 −0.45 mA

Irestart restart current VDRAIN > 100 V;

Vth(UVLO) <V

CC <V

startup

−650 −550 −450 µA

ICC(oper) operating supply

current no load on pin DRIVER 1.1 1.3 1.5 mA

Demagnetization management (pin DEM)

Vth(DEM) threshold voltage on pin

DEM 50 80 110 mV

Vth(det)(CCM) continuous conduction

mode detection

threshold voltage

−80 −50 −20 mV

VCL(neg) negative clamp voltage IDEM =−500 µA−0.5 −0.45 −0.40 V

VCL(pos) positive clamp voltage IDEM = 250 µA 0.5 0.7 0.9 V

tsup(xfmr_ring) transformer ringing

suppression time at start of secondary

stroke 1.1 1.5 1.9 µs

Pulse width modulator

ton(min) minimum on-time - tleb -ns

ton(max) maximum on-time QR mode 20 25 30 µs

δmax maximum duty cycle 67 70 73 %

Oscillator

fosc oscillator frequency VCTRL < 1 V 100 125 150 kHz

Product data sheet Rev. 01 — 18 January 2007 14 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

Duty cycle control (pin CTRL)

Vmin(δmax) minimum voltage

(maximum duty cycle) - 1.0 - V

Vmax(δmin) maximum voltage

(minimum duty cycle) - 1.5 - V

∆Isc/∆t slope compensation

current −1.2 −1−0.8 µA/µs

VCTRL(detect) detection voltage on pin

CTRL 0.56 0.63 0.70 V

Protection and timing input (pin PROTECT)

Vtrip trip voltage [1] 2.37 2.5 2.63 V

Vtrip(latch) latch trip voltage 2.85 3 3.15 V

VVCC(latch)(reset) latch reset voltage on

pin VCC VPROTECT < 2.3 V - 4.5 - V

Ich charge current VCTRL < 0.63 V −57 −50 −43 µA

Idch discharge current - 100 - nA

Valley switch (pin DRAIN)

(∆V/∆t)vrec valley recognition

voltage change with

time

−43 - +43 V/µs

td(vrec-swon) valley recognition to

switch-on delay time [2] - 150 - ns

Overcurrent and winding short-circuit protection (pin SENSE)

Vsense(max) maximum sense

voltage ∆V/∆t = 0.1 V/µs 0.48 0.52 0.56 V

tPD propagation delay ∆V/∆t = 0.5 V/µs - 140 185 ns

tleb leading edge blanking

time 330 400 470 ns

Istartup(soft) soft startup current VSENSE <0.5V 456075µA

Brown-out protection (pin DEM)

Iprot(bo) brownout protection

current A constant Iprot(bo) is

drawn from pin DEM. [3] −68 −60 −52 µA

ten(prot)bo brownout protection

enable time 1.5 2 2.5 µs

Table 5. Characteristics

…continued

Symbol Parameter Conditions Min Typ Max Unit

Product data sheet Rev. 01 — 18 January 2007 15 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

[1] TEA1532CT: safe restart; TEA1532BT: latch.

[2] Guaranteed by design.

[3] Vi detection level. Set by the demagnetization resistor RDEM; see Section 7.16.

11. Application information

A converter with the TEA1532BT; TEA1532CT consists of an input ﬁlter, a transformer

with a third winding (auxiliary), and an output stage with a feedback circuit.

Capacitor CVCC buffers the IC supply voltage, which is powered via the internal current

source, that is connected to the rectiﬁed mains during start-up and, via the auxiliary

winding, during operation.

A sense resistor Rsense converts the primary current into a voltage at pin SENSE. The

value of Rsense deﬁnes the maximum primary peak current.

Figure 9 shows a ﬂyback conﬁguration using the discontinuous conduction mode.

Pin PROTECT is used in this example for external overvoltage protection and open loop

or output short-circuit protection. If this pin is not used, it must be tied to ground. Figure 12

shows a ﬂyback conﬁguration using the continuous conduction mode. The pin PROTECT

is used in this example for external overtemperature protection and open loop or output

short-circuit protection.

Driver (pin DRIVER)

Isource source current VCC = 9.5 V;

VDRIVER =2V -−170 −88 mA

Isink sink current VCC = 9.5 V

VDRIVER = 2 V - 300 - mA

VDRIVER = 9.5 V 400 700 - mA

Vo(max) maximum output

voltage VCC > 12 V - 11.5 12 V

Temperature protection

Tpl(max) maximum protection

level temperature 130 140 150 °C

Tpl(hys) protection level

hysteresis temperature VCC >2V - 8 - °C

Table 5. Characteristics

…continued

Symbol Parameter Conditions Min Typ Max Unit

Product data sheet Rev. 01 — 18 January 2007 16 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

Fig 9. Flyback conﬁguration using the discontinuous conduction mode

VCC

Vmains

RCTRL RDEM

Rsense

GND

PROTECT

CTRL

DRAIN

power

MOSFET

SENSE

DEM

DRIVER

Rss

Css

coa050

TEA1532BT

TEA1532CT

Product data sheet Rev. 01 — 18 January 2007 17 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

(1) In CCM, the brown-out protection is implemented by the maximum duty cycle in combination

with pin PROTECT.

Fig 10. Typical waveforms 1

001aaf069

VDRIVER

VPROTECT

start-up

sequence normal

operation OVP

TEA1532CT normal

operation output

short-circuit

TEA1532CT

brown-out(1)

VCC

Vstartup

drain of power

MOSFET

Vth(UVLO)

2.5 V

Product data sheet Rev. 01 — 18 January 2007 18 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

(1) When VPROTECT is forced above 3 V, the protection is always latched. So the IC is not started at

Vstartup unless the VCC voltage drops below the VVCC(latch)(reset) level. This is the same action

used for external OTP compensation described in Section 7.15.

(2) External OTP for TEA1532BT and TEA1532CT; OVP and output short circuit for TEA1532BT.

Fig 11. Typical waveforms 2

001aaa841

VDRIVER

VPROTECT(1)

start-up

sequence normal

operation

VCC

Vstartup

VDRAIN

Vth(UVLO)

2.5 V

protection

active(2)

Product data sheet Rev. 01 — 18 January 2007 19 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

12. Test information

12.1 Quality information

The

General Quality Speciﬁcation for Integrated Circuits, SNW-FQ-611

is applicable.

(1) The pin PROTECT is used in this example for external OTP and open loop or output

short-circuit protection. Slope compensation is determined by the value of Rslopecomp.

Fig 12. Flyback conﬁguration using the continuous conduction mode

TEA1532BT

TEA1532CT

VCC

Vmains

RCTRL

Rsense

GND

PROTECT(1)

CTRL

DRAIN

power

MOSFET

SENSE

DEM

DRIVER

Rss

Css

coa051

Rslopecomp

Product data sheet Rev. 01 — 18 January 2007 20 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

13. Package outline

Fig 13. Package outline SOT96-1 (SO8)

UNIT A

max. A1A2A3bpcD

(1) E(2) (1)

ELL

pQZywv θ

REFERENCES

OUTLINE

VERSION EUROPEAN

PROJECTION ISSUE DATE

IEC JEDEC JEITA

inches

1.75 0.25

0.10 1.45

1.25 0.25 0.49

0.36 0.25

0.19 5.0

4.8 4.0

3.8 1.27 6.2

5.8 1.05 0.7

0.6 0.7

0.3 8

0.25 0.10.25

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

Notes

1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.

2. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.

1.0

0.4

SOT96-1

detail X

vMA

(A )

pin 1 index

076E03 MS-012

0.069 0.010

0.004 0.057

0.049 0.01 0.019

0.014 0.0100

0.0075 0.20

0.19 0.16

0.15 0.05 0.244

0.228 0.028

0.024 0.028

0.012

0.010.010.041 0.004

0.039

0.016

0 2.5 5 mm

scale

SO8: plastic small outline package; 8 leads; body width 3.9 mm SOT96-1

99-12-27

03-02-18

Product data sheet Rev. 01 — 18 January 2007 21 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

14. Revision history

Table 6. Revision history

Document ID Release date Data sheet status Change notice Supersedes

TEA1532BT_TEA1532CT_1 20070118 Product data sheet - -

Product data sheet Rev. 01 — 18 January 2007 22 of 23

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

15. Legal information

15.1 Data sheet status

[1] Please consult the most recently issued document before initiating or completing a design.

[2] The term ‘short data sheet’ is explained in section “Deﬁnitions”.

[3] The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status

information is available on the Internet at URL http://www.nxp.com.

15.2 Deﬁnitions

Draft — The document is a draft version only. The content is still under

internal review and subject to formal approval, which may result in

modiﬁcations or additions. NXP Semiconductors does not give any

representations or warranties as to the accuracy or completeness of

information included herein and shall have no liability for the consequences of

use of such information.

Short data sheet — A short data sheet is an extract from a full data sheet

with the same product type number(s) and title. A short data sheet is intended

for quick reference only and should not be relied upon to contain detailed and

full information. For detailed and full information see the relevant full data

sheet, which is available on request via the local NXP Semiconductors sales

ofﬁce. In case of any inconsistency or conﬂict with the short data sheet, the

full data sheet shall prevail.

15.3 Disclaimers

General — Information in this document is believed to be accurate and

reliable. However, NXP Semiconductors does not give any representations or

warranties, expressed or implied, as to the accuracy or completeness of such

information and shall have no liability for the consequences of use of such

information.

Right to make changes — NXP Semiconductors reserves the right to make

changes to information published in this document, including without

limitation speciﬁcations and product descriptions, at any time and without

notice. This document supersedes and replaces all information supplied prior

to the publication hereof.

Suitability for use — NXP Semiconductors products are not designed,

authorized or warranted to be suitable for use in medical, military, aircraft,

space or life support equipment, nor in applications where failure or

malfunction of a NXP Semiconductors product can reasonably be expected to

result in personal injury, death or severe property or environmental damage.

NXP Semiconductors accepts no liability for inclusion and/or use of NXP

Semiconductors products in such equipment or applications and therefore

such inclusion and/or use is at the customer’s own risk.

Applications — Applications that are described herein for any of these

products are for illustrative purposes only. NXP Semiconductors makes no

representation or warranty that such applications will be suitable for the

speciﬁed use without further testing or modiﬁcation.

Limiting values — Stress above one or more limiting values (as deﬁned in

the Absolute Maximum Ratings System of IEC 60134) may cause permanent

damage to the device. Limiting values are stress ratings only and operation of

the device at these or any other conditions above those given in the

Characteristics sections of this document is not implied. Exposure to limiting

values for extended periods may affect device reliability.

Terms and conditions of sale — NXP Semiconductors products are sold

subject to the general terms and conditions of commercial sale, as published

at http://www.nxp.com/proﬁle/terms, including those pertaining to warranty,

intellectual property rights infringement and limitation of liability, unless

explicitly otherwise agreed to in writing by NXP Semiconductors. In case of

any inconsistency or conﬂict between information in this document and such

terms and conditions, the latter will prevail.

No offer to sell or license — Nothing in this document may be interpreted

or construed as an offer to sell products that is open for acceptance or the

grant, conveyance or implication of any license under any copyrights, patents

or other industrial or intellectual property rights.

15.4 Trademarks

Notice: All referenced brands, product names, service names and trademarks

are the property of their respective owners.

GreenChip — is a trademark of NXP B.V.

16. Contact information

For additional information, please visit: http://www.nxp.com

For sales ofﬁce addresses, send an email to: salesaddresses@nxp.com

Document status[1][2] Product status[3] Deﬁnition

Objective [short] data sheet Development This document contains data from the objective speciﬁcation for product development.

Preliminary [short] data sheet Qualiﬁcation This document contains data from the preliminary speciﬁcation.

Product [short] data sheet Production This document contains the product speciﬁcation.

NXP Semiconductors TEA1532BT; TEA1532CT

GreenChip II SMPS control IC

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: salesaddresses@nxp.com

Date of release: 18 January 2007

Document identifier: TEA1532BT_TEA1532CT_1

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section ‘Legal information’.

17. Contents

1 General description. . . . . . . . . . . . . . . . . . . . . . 1

2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.1 Distinctive features . . . . . . . . . . . . . . . . . . . . . . 1

2.2 Green features . . . . . . . . . . . . . . . . . . . . . . . . . 1

2.3 Protection features . . . . . . . . . . . . . . . . . . . . . . 1

3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

4 Ordering information. . . . . . . . . . . . . . . . . . . . . 2

5 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3

6 Pinning information. . . . . . . . . . . . . . . . . . . . . . 4

6.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

6.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4

7 Functional description . . . . . . . . . . . . . . . . . . . 4

7.1 Start-up, mains enabling operation level and

undervoltage lock out . . . . . . . . . . . . . . . . . . . . 6

7.2 Supply management. . . . . . . . . . . . . . . . . . . . . 6

7.3 Oscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

7.4 Cycle skipping. . . . . . . . . . . . . . . . . . . . . . . . . . 6

7.5 Current control mode . . . . . . . . . . . . . . . . . . . . 6

7.6 OverCurrent Protection (OCP) . . . . . . . . . . . . . 7

7.7 Demagnetization (QR operation) . . . . . . . . . . . 7

7.8 Valley switching. . . . . . . . . . . . . . . . . . . . . . . . . 7

7.9 Continuous Conduction Mode (CCM). . . . . . . . 8

7.10 Adjustable slope compensation . . . . . . . . . . . . 8

7.11 Minimum and maximum on-time. . . . . . . . . . . . 9

7.12 Soft start-up (pin SENSE). . . . . . . . . . . . . . . . . 9

7.13 Control pin protection . . . . . . . . . . . . . . . . . . . 10

7.14 PROTECT and timing input . . . . . . . . . . . . . . 10

7.15 OverTemperature Protection (OTP) . . . . . . . . 11

7.16 Brown-out protection. . . . . . . . . . . . . . . . . . . . 11

7.17 Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

8 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 12

9 Thermal characteristics. . . . . . . . . . . . . . . . . . 12

10 Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 13

11 Application information. . . . . . . . . . . . . . . . . . 15

12 Test information. . . . . . . . . . . . . . . . . . . . . . . . 19

12.1 Quality information . . . . . . . . . . . . . . . . . . . . . 19

13 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 20

14 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 21

15 Legal information. . . . . . . . . . . . . . . . . . . . . . . 22

15.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 22

15.2 Deﬁnitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

15.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 22

15.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 22

16 Contact information. . . . . . . . . . . . . . . . . . . . . 22

17 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23