TEA1721FT/N1 - NXP - Datasheet.Live

1. Product profile

1.1 General description

The TEA1721 is a small and low cost module Switched Mode Power Supply (SMPS)

controller IC for low power applications (up to 5 W) and operates dir ectly from the rectified

universal mains input. The device includes a high voltage power switch (700 V) and has

been optimize d fo r flyb ac k con ve rte r to po lo gie s to provide high-efficiency over the entire

load range with ultra-low power consumption in the no-load co nditio n. It provide s a circuit

for start-up directly from the rectified mains voltage without any external bleeder circuits.

The converter operates as a regulated voltage source from no-load up to the maximum

output current and operates as current source that delivers the maximum current over a

broad output voltage range. Using the TEA1721, a low power converter can be built at

minimum cost and with the minimum number of external components.

The controller reg ulates the output volt age with primar y-side sensing wh ich eliminates the

need for an additional secondary feedback circ uitry and simplifies the design. At higher

power levels, a frequency and current control mode is used. It operates with Burst mode

control at low power levels and no-load condition. The burst mode minimizes audible

noise and provides an energy saver state which reduces the power consumption in

no-load condition. The Burst mode frequency of 1750 Hz enables no-load power

consumptio n be low < 30 mW at hig h m ain s input .

1.2 Features and benefits

Power features:

Low power SMPS controller with inte grated power switch designed for applications up

to 5 W

700 V high voltage power switch for global mains operation

Primary sensing for control of the output voltage without optocoupler and secondary

feedback circuitry

Minimizes audible noise in all operation modes

USB battery charging and Energy Star 2.0 compliant

Jitter function for reduced EMI

TEA1721FT

HV st art-up flyback controller with integrated MOSFET for 5 W

applications, 1750 Hz burst frequency

Rev. 1.1 — 7 June 2012 Product data sheet

Product data sheet Rev. 1.1 — 7 June 2012 2 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

Green features:

Enables no-load power consumption < 30 mW

Very low supply current in no-load condition with energy saver mode

Incorporates a high voltage start-up circuit with zero current consumption under

normal switching operation

Available in halogen-free and Restriction of Hazardous Substances (RoHS) SO7

package

Protective functions:

OverVoltage Protection (OVP) on Feedback control (FB) pin with auto-restart

UnderVoltage LockOut (UVLO) protection on IC supply pin

OverTemperature Protection (OTP)

Soft-start by reduced peak current for zero and low output voltage

Demagnetization protection for guaranteed discontinuous conduction mode operation

Open and short- circuit protectio n of the Fee db a ck con tr ol (F B) pin

Short-circ uit pr ot ec tio n of th e ch arge r ou tp ut

1.3 Applications

Battery charg ers for cellula r ph o ne s an d ot he r low po we r ad a pt ers up to 5 W

Standby supply for TV and desktop PC

Power supply for White Goods applications

1.4 Quick reference data

Table 1. Quick reference data

Symbol Parameter Conditions Min Typ Max Unit

Power switch (Pin: DRAIN)

RDSon drain-source

on-state

resistance

Ids = 30 mA; Tj = 100 C 13 15.5 17 Ω

Oscillator (Pins: DRAIN and SOURCE)

fburst burst frequency burst frequency in CVB mode,

without jitter 1575 1750 1925 Hz

fosc-high oscillator

frequency High maximum switching frequency

in CV and CC mode, without

jitter

48 50.5 53 kHz

Supply (Pin: VCC)

VCC(startup) start-up supply

voltage 15 17 19 V

VCC(stop) stop supply

voltage undervoltage lockout of IC 7.5 8.5 9.5 V

Product data sheet Rev. 1.1 — 7 June 2012 3 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

2. Ordering information

3. Block diagram

3.1 Block diagram

Table 2. Ordering information

Type number Package

Name Description Version

TEA1721FT/N1 SO7 plastic small outline package; 7 leads; body width 3.9 mm SOT1175-1

Fig 1. Block diagram

START

STOP

VCC

GND

REFERENCES

AND

TEMPERATURE

PROTECTION

fosc,

VSOURCE AND

JITTER

REGULATOR

OSCILLATOR

BURST

REGULATOR

CONTROL

LOGIC

SOURCE

DRAIN

SENSOR

start-up source

VSOURCE

comparator

fburst

fSW

VOVP(FBS)

VFBS

OTP

enable

Vref

controller and cable

compensation

demag

driver

power

switch

Vpeak

001aan293

TEA1721

Product data sheet Rev. 1.1 — 7 June 2012 4 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

4. Pinning information

4.1 Pinning

4.2 Pin description

5. Functional description

5.1 Start-up

The TEA1721 starts up by charging the VCC capacitor until the VCC(start) level. The

charging current flows from the high voltage DRAIN pin via an internal start-up current

source to the VCC pin.

Once the start level has been reached the start-up current source is switched off. During

switching operation, the start-up current source remains current-less and has zero

bleeder loss.

5.2 Primary sensing

The FB input senses the reflected secondary voltage on the primary side. The FB input

has a sample and hold function that samples the FB voltage on the secondary stroke to

control the output voltage.

The sampled VFBS voltage is the input for the TEA1721 ’s control loop and defines the

operating mode.

Fig 2. Pinning top view

TEA1721

GND1 DRAIN

GND2

GND3 SOURCE

FB VCC

001aan294

Pin Pin name I/O type Pin description

1 GND1 ground

2 GND2 ground

3 GND3 ground

4 FB I feedback input for voltage sensing

5 VCC I supply input

6 SOURCE O source for power switch

7 DRAIN I drain of power switch

- - high voltage spacer

Product data sheet Rev. 1.1 — 7 June 2012 5 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

5.3 Operati ng modes

The TEA1721 operates in three modes, one of which is active at the time. The three

modes in order of decreasing load impedance are:

•CVB: Constant Voltage with Burst mode

•CV: Constant Voltage mode

•CC: Constant Current mode

The converter acts as a voltage source in CVB and CV modes.

The converter acts as a current source in CC mode.

5.3.1 Constant Voltage with Burst mode (CVB)

At low power, the TEA1721 operates in Burst mode.

Burst mode operates with a VSOURCE = 100 mV, a switching frequency of 22.5 kHz and

burst duty-cycle regulation by sensing the FB voltage.

The TEA1721 features an energy save function that puts the main part of the analogue

blocks in a sleep mode with low supply current in burst mode. The burst mode enables the

energy save mode in the non-switching part of the burst. The IC switches to the nominal

supply just before new burst starts.

Transition from burst mode to CV mode happens at 100 % burst duty cycle: a burst

completely filled with 32 pulses. This 100 % pulse train is identical to the lowest power

level of the CV mode. The TEA1721 changes directly from burst mode to CV mode if the

FB voltage drops below 2.4 V in burst mode.

5.3.2 Constant Voltage mode (CV)

At higher power levels, the TEA1721 operates in CV mode. The outpu t voltage is sensed

by the FB pin and the control keeps the output voltage constant over the power range.

CV mode starts at 22.5 kHz switching frequency and ISOURCE regulation at the VSOURCE

minimum level of 100 mV.

With an increasing power output, the VSOURCE level and the switching frequency are also

increased.

CV mode is exited when the maximum power level is reached. Maximum powe r occurs at

ISOURCE regulation at the VSOURCE maximum level of 555 mV and a maximum switching

frequency of 50.5 kHz.

Product data sheet Rev. 1.1 — 7 June 2012 6 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

5.3.3 Constant Current mode (CC)

The CC mode st arts at m aximum power delivery and keep s the output current const ant for

decreasing output voltage.

CC mode is enabled when the converter is operating at the maximum switching

frequency, with the maximum primary peak current when the FB voltage drops below the

regulated level.

CC mode operation controlled is by regulation of the switching frequency from 50.5 kHz

down to 22.5 kHz and by ISOURCE regulation fro m th e ma xim u m V SOURCE level of 555 mV

until level of VSOURCE is 0.21 V. The VSOURCE level of 0.21 V equ als the level at start-up

with zero output voltage and the output capacitor discharged or on a short-circuit of the

charger output.

5.4 Jitter

The TEA1721 features a jitter function for ElectroMagnetic Interference (EMI) reduction.

The switching frequency is 7 % typical for the spread spectrum. The sweep frequency is a

low frequency of approximately 200 Hz. To keep the output power constan t, the VSOURCE

level is jittered with the opposite polarity. The jitter is active in all operation modes except

burst mode.

Product data sheet Rev. 1.1 — 7 June 2012 7 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

6. Limiting values

[1] Human body model: equivalent to discharging a 100 pF capacitor through a 1.5 kΩ series resistor.

7. Thermal characteristics

Table 3. Limiting values

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

Symbol Parameter Conditions Min Max Unit

Tamb ambient temperature -40 +85 °C

Tjjunction temperature -40 +150 °C

Tstg storage temperature -55 +150 °C

VESD electrostatic discharge voltage CDM; all pins -500 +500 V

HBM; all pins, except pin 7 [1] -2000 +2000 V

HBM; pin 7 [1] -1000 +1000 V

Voltages

VDRAIN voltage on pin DRAIN -2 +700 V

VSOURCE voltage on pin SOURCE -0.3 +5 V

VCC voltage on pin VCC -0.3 +35 V

VFB voltage on pin FB -20 +5 V

Currents

IDRAIN current on pin DRAIN -0.1 +0.7 A

ISOURCE current on pin SOURCE -0.7 +0.1 A

Table 4. Thermal characteristics

Symbol Parameter Conditions Min Typ Max Unit

Rth(j-a) thermal resistance

from junction to

ambient

in free air; SO7 package; on open PCB

of 2.2 cm X 2.2 cm; 2-layer; 70 µm Cu - 136 - K/W

in free air; SO7 package; on open PCB

of 3 cm X 6 cm; 1-layer; 35 µm Cu - 136 - K/W

Product data sheet Rev. 1.1 — 7 June 2012 8 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

8. Characteristics

Table 5. Characteristics

VCC = 20 V; VFB = 0 V; Rsource = 1.5 Ω; Tj-switch = 25 °C; T j-controller = 25 °C; all voltages referenced to GND,

positive currents flow into the IC, unless otherwise specified.

Symbol Parameter Conditions Min Typ Max Unit

Supply (Pin: VCC)

ICC(startup)0V start-up supply current VCC = 0 V -1.6 -1.2 -0.8 mA

ICC(startup)20V start-up supply current VCC = VCC(startup) -1.6 -0.7 -0.2 mA

ICC(energysave) supply current in

energy save VFB = 2.8 V, non-switching 90 130 170 µA

ICC(50kHz) supply current at

50 kHz in CC mode 530 750 970 µA

VCC(startup) start-up supply voltage 15 17 19 V

VCC(stop) stop supply voltage undervoltage lockout of IC 7.5 8.5 9.5 V

Totp overtemperature

protection threshold

temperat ure on

controller die

140 150 160 °C

Totp(hys) overtemperature

protection temperature

hysteresis

-50-°C

Feedback (Pin: FB)

Vth(ovp)fbck feedback overvoltage

protection threshold

voltage

3.1 3.2 3.3 V

Vref(fbck) feedback reference

voltage 2.5 2.55 2.6 V

Vth(fbck)CV constant voltage mode

feedback threshold

voltage

in burst mode operation 2.35 2.4 2.45 V

Vth(det)demag(fb) demagnetization

detection voltage level

on FB pin

25 50 75 mV

Oscillator (Pins: DRAIN and SOURCE)

fburst burst frequency burst frequency in CVB mode, without

jitter 1575 1750 1925 Hz

fjit/fsw jitter frequency to

switching frequency

ratio

in all operation modes except in CVB

mode 579%

fosc-high oscillator frequency

High maximum switching frequency in CV

and CC mode, without jitter 48 50.5 53 kHz

fosc-low oscillator frequency

Low minimum switching frequency in CV

and CC mode, without jitter. Switching

frequency in CVB mode

21 22.5 24 kHz

fsweep jitter sweep frequency In current source operation 150 200 250 Hz

δmax maximum duty cycle 72 75 78 %

Product data sheet Rev. 1.1 — 7 June 2012 9 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

Power switch (Pin: DRAIN)

Idrain(off) off-state drain current VDRAIN = 325 V - 1 - µA

RDSon drain-source on-state

resistance Tj=25°C; I

ds = 30 mA 13 15.5 17 Ω

V(BR)DS drain-source

breakdown voltage 700--V

Peak current comparator (Pin: SOURCE)

tPD propagation delay time dV/dt = 0.2 V/µs - 100 - ns

tleb leading edge blanking

time 290 325 360 ns

Vref-peak-high reference voltage, high

peak voltage maximu m peak voltage in CV and CC

modes, without jitter 0.525 0.555 0.585 V

Vref-peak-low referen c e voltage, low

peak voltage in CVB mode 0.085 0.1 0.115 V

Vref-0 V reference voltage at

start-up or 0 V

feedback voltage

in CC mode wi th VFBS = 0 V 0.18 0.2 1 0 .24 V

Table 5. Characteristics …continued

VCC = 20 V; VFB = 0 V; Rsource = 1.5 Ω; Tj-switch = 25 °C; T j-controller = 25 °C; all voltages referenced to GND,

positive currents flow into the IC, unless otherwise specified.

Symbol Parameter Conditions Min Typ Max Unit

Product data sheet Rev. 1.1 — 7 June 2012 10 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

9. Package outline

Fig 3. Package outline SOT1175-1 (SO7)

References

Outline

version European

projection Issue date

IEC JEDEC JEITA

SOT1175-1 - - -

- - -

sot1175-1_po

10-03-30

10-04-21

Unit

mm max

nom

min

1.75 0.250

0.175

0.100 0.25 0.49

0.40

0.36

5.0

4.9

4.8

Dimensions

Note

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.

A1A2

1.45

1.35

1.25

A3bp

1.0

0.7

0.4

0.70

0.67

0.60 0.25

LpQvc

0.25

0.20

0.19

4.0

3.9

3.8

1.27 1.05

6.2

6.0

5.8

HEL

0.1

0.7

0.5

0.3

8°

4°

0°

yZθ

0.25

2.50 5 mm

scale

SO7: plastic small outline package; 7 leads; body width 3.9 mm SOT1175-1

detail X

HEvA

pin 1 index

ebpw

Product data sheet Rev. 1.1 — 7 June 2012 11 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

10. Revision history

Table 6. Revision history

Document ID Release date Data sheet status Change notice Supersedes

TEA1721FT v.1.1 20120607 Product data sheet - TEA1721FT v.1

Modifications: •Symbo l td(OCP) changed to tPD in table 5 on page 8.

•Data sheet title changed.

TEA1721FT v.1 20120508 Product data sheet - -

Product data sheet Rev. 1.1 — 7 June 2012 12 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

11. Legal information

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[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 URLhttp://www.nxp.com.

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Preview — The document is a preview version only. The document is still

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Quick reference data — The Quick reference dat a is an extract of the

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

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

damage to the device. Limiting values are stress rating s only and (proper)

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

the Recommended operating conditions section (if present) or the

Characteristics sections of this document is not warranted. Constant or

repeated exposure to limiting values will permanent ly and irreversibly affect

the quality and reliability of the device.

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

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

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

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

Product data sheet Rev. 1.1 — 7 June 2012 13 of 14

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

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Notice: All refe renced brands, produc t names, service names and trademarks

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Adelante,Bitport,Bitsound,CoolFlux,CoReUse,DESFire,EZ-HV,FabKey,G

reenChip,HiPerSmart,HITAG,I²C-bus

logo,ICODE,I-CODE,ITEC,Labelution,MIFARE,MIF ARE Plus,MIFARE

Ultralight,MoReUse,QLPAK,Silicon

Tuner,SiliconMAX,SmartXA,STARplug,TOPFET,TrenchMOS,TriMedia

andUCODE — are trademarks of NXP B.V.

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Corporation.

12. Contact information

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

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

NXP Semiconductors TEA1721FT

HV start-up flyback controller with integrated MOSFET for 5 W

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

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

Date of release: 7 June 2012

Document iden tifier: TEA1721FT

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

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

13. Contents

1 Product profile . . . . . . . . . . . . . . . . . . . . . . . . . . .1

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

1.2 Features and benefits. . . . . . . . . . . . . . . . . . . . .1

1.3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

1.4 Quick reference data . . . . . . . . . . . . . . . . . . . . .2

2 Ordering information. . . . . . . . . . . . . . . . . . . . . .3

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

3.1 Block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . .3

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

4.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

4.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . .4

5 Functional description . . . . . . . . . . . . . . . . . . . .4

5.1 Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

5.2 Primary sensing . . . . . . . . . . . . . . . . . . . . . . . . .4

5.3 Operating modes . . . . . . . . . . . . . . . . . . . . . . . .5

5.4 Jitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5.3.1 Constant Voltage with Burst mode (CVB). . . . . .5

5.3.2 Constant Voltage mode (CV) . . . . . . . . . . . . . . .5

5.3.3 Constant Current mode (CC) . . . . . . . . . . . . . . .6

6 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . .7

7 Thermal characteristics . . . . . . . . . . . . . . . . . . .7

8 Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . .8

9 Package outline . . . . . . . . . . . . . . . . . . . . . . . . .10

10 Revision history. . . . . . . . . . . . . . . . . . . . . . . . .11

11 Legal information. . . . . . . . . . . . . . . . . . . . . . . .12

11.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . .12

11.2 Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

11.3 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . .12

11.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . .13

12 Contact information. . . . . . . . . . . . . . . . . . . . . .13