PT4242A - Texas Instruments

For technical support and more information, see inside back cover or visit www.ti.com

Standard Application

Features

•10W Output Power

•Input Voltage: 18V to 36V

•Output Voltages: 1.2V to 13.2V

•1500 VDC Isolation

•Temp Range: –40°C to +85°C

•Remote On/Off Control

•Undervoltage Lockout

•Output Current Limit

Ordering Information

PT4241¨ =1.8V/3A (5.4W)

PT4242¨ =3.3V/3A

PT4243¨ =5.0V/2A

PT4244¨ =12.0V/0.85A

PT4245¨ =2.5V/3A (7.5W)

PT4246¨ =1.5V/3A (4.5W)

† PT4247¨ =1.3V/3A (3.9W)

†Adjustable to 1.2V

Description

The PT4240 power modules are a

series of DC/DC converters housed in

an ultra-low profile (8mm) solderable

copper case. The series includes a num-

ber of preset output voltages ranging

from 1.3V

† up to 12V, all fully approved

for Telecom use. They may also be used

in many other applications that require

input-output isolation over an extended

temperature range. The modules are an

ideal choice for low-power digital and

analog circuits, including DSPs and

microcontrollers. The flexibility of

input-output isolation also allows the

output to be configured for negative

voltage operation.

The PT4240 series is made available

in both horizontal and vertical pin con-

figurations, including surface mount.

•Short-Circuit Protection

•Low-Profile Package (8mm)

•Space Saving Package

•Solderable Copper Case

•Safety Agency Approvals:

UL 60950

CSA 22.2 60950

PT Series Suffix (PT1234x)

Case/Pin Order Package

Configuration Suffix Code

Vertical N(EPE)

Horizontal A(EPF)

SMD C(EPG)

(Reference the applicable package code draw-

ing for the dimensions and PC board layout)

PT4240 Series

10-W Low-Profile 24V-Input

Isolated DC/DC Converter SLTS145A

(Revised 1/14/2002)

PT4240 +Vout

-Vout

+Vin

-Vin Remote

On/Off V

(

5 8, 9

6, 7

-V

out

-V

out

Pin-Out Information

Pin Function

1 Remote On/Off *

2 Do not connect

3–V

4 Do not connect

5+V

6-V

out

7-V

out

8+V

out

9+V

out

10 Vout Adj *

* For further information, see

application notes.

Not Recommended For New Designs

For technical support and more information, see inside back cover or visit www.ti.com

PT4240 Series

10-W Low-Profile 24V-Input

Isolated DC/DC Converter

Specifications (Unless otherwise stated, Ta =25°C, Vin =24V, Cin =0µF, Cout =0µF, and Io =Iomax)

PT4240 SERIES

Characteristic Symbol Conditions Min Typ Max Units

Output Current IoOver Vin range Vo ≤ 3.3V 0.1 (1) —3

Vo =5.0V 0.1 (1) —2

Vo = 12V 0.1 (1) — 0.85

Input Voltage Range Vin Over Io Range 18.0 24.0 36.0 VDC

Set Point Voltage Tolerance Vo tol —±1±2%V

Temperature Variation Regtemp –40° ≤Ta ≤ +85°C, Io =Iomin — ±0.2 — %Vo

Line Regulation Regline Over Vin range — ±1 — mV

Load Regulation Regload Over Io range — ±5 — mV

Total Output Voltage Variation ∆Votot Includes set-point, line, load, — ±1.5 ±3 %Vo

–40° ≤Ta ≤ +85°C

Efficiency ηVo = 12V — 86 —

Vo = 5.0V — 84 —

Vo = 3.3V — 80 —

Vo = 2.5V — 77 — %

Vo = 1.8V — 72 —

Vo = 1.5V — 70 —

Vo = 1.3V — 64 —

Vo Ripple (pk-pk) Vr20MHz bandwidth Vo ≤ 5.0V — 50 — mVpp

Vo = 12V — 100 —

Transient Response ttr 1A/µs load step, 50% to 100% Iomax — 75 — µs

∆Vtr Vo over/undershoot Vo ≤ 5.0V — ±150 — mV

Vo = 12V — ±350 —

Output Voltage Adjust Vadj Vo ≥2.5V ±10 — — %Vo

Current Limit Threshold Ilim Vin =18V, ∆Vo = –1% — 150 — %Iomax

Switching Frequency ƒsOver Vin range 250 300 350 kHz

Under-Voltage Lockout UVLO — 16 — V

Remote On/Off (Pin 1) Referenced to –Vin (pin 3)

Input High Voltage VIH 4.5 — Open (3) V

Input Low Voltage VIL –0.2 — +0.8

Input Low Current IIL — –0.5 — mA

Standby Input Current Iin standby pins 1 & 3 connected — 1 — mA

Internal Input Capacitance Cin — 0.66 — µF

External Output Capacitance Cout Vo ≤ 5.0V 0 (5) — 1000 µF

Vo = 12V 0 (5) — 330

Isolation Voltage Input–output/input–case 1500 — — V

Capacitance Input to output — 1,100 — pF

Resistance Input to output 10 — — MΩ

Operating Temperature Range TaOver Vin range -40 — +85 (4) °C

Storage Temperature Ts— -40 — +125 °C

Reliability MTBF Per Bellcore TR-332 4.7 — — 106 Hrs

50% stress, Ta =40°C, ground benign

Mechanical Shock — Per Mil-Std-883D, method 2002.3, — 500 — G’s

1mS, half-sine, mounted to a fixture

Mechanical Vibration — Mil-Std-883D, Method 2007.2 — 20 (6) —G’s

20-2000Hz, all case styles soldered to PC

Weight — — — 20 — grams

Flammability — Materials meet UL 94V-0

Notes: (1) The DC/DC converter will operate at no load with reduced specifications.

(2) The maximum output current reduces the output power of the following devices to less than 10W:-

PT4245 =7.5W; PT4241 =5.4W; PT4246 =4.5W; PT4247 =3.9W.

(3) The Remote On/Off (pin 1) has an internal pull-up, and if it is left open circuit the converter will operate when input power is applied. The open-circuit

voltage is typically 5V. Refer to the application notes for interface considerations.

(4) See Safe Operating Area curves or contact the factory for the appropriate derating.

(5) An output capacitor is not required for proper operation.

(6) The case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing.

Not Recommended For New Designs

For technical support and more information, see inside back cover or visit www.ti.com

Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the converter.

Note B: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

PT4242, Vo =3.3VDC (See Note A)

PT4240 Series

10-W Low-Profile 24V-Input

Isolated DC/DC Converter

Efficiency vs Output Current

Output Ripple vs Output Current

Power Dissipation vs Output Current

Safe Operating Area @Vin =24V (Note B)

PT4243, Vo =5.0VDC (See Note A)

Efficiency vs Output Current

Output Ripple vs Output Current

Power Dissipation vs Output Current

Safe Operating Area @Vin =24V (Note B)

PT4244, Vo =12.0VDC (See Note A)

Efficiency vs Output Current

Output Ripple vs Output Current

Power Dissipation vs Output Current

Safe Operating Area @Vin =24V (Note B)

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Iout (A)

Ambient Temperature (°C)

200LFM

120LFM

60LFM

Nat conv

Airflow

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

0.0 0.4 0.8 1.2 1.6 2.0

Iout (A)

Ambient Temperature (°C)

200LFM

120LFM

60LFM

Nat conv

Airflow

0.5

1.5

2.5

00.511.522.53

Iout (A)

Pd - Watts

18.0V

24.0V

30.0V

36.0V

VIN

00.511.522.53

Iout (A)

Ripple - mV

18.0V

24.0V

30.0V

36.0V

VIN

0 0.5 1 1.5 2 2.5 3

Iout (A)

Efficiency - %

36.0V

30.0V

24.0V

18.0V

VIN

0.5

1.5

2.5

0 0.4 0.8 1.2 1.6 2

Iout (A)

Pd - Watts

36.0V

24.0V

30.0V

18.0V

VIN

0 0.4 0.8 1.2 1.6 2

Iout (A)

Ripple - mV

18.0V

24.0V

30.0V

36.0V

VIN

0 0.4 0.8 1.2 1.6 2

Iout (A)

Efficiency - %

36.0V

30.0V

24.0V

18.0V

VIN

0.5

1.5

2.5

0 0.2 0.4 0.6 0.8 1

Iout (A)

Pd - Watts

18.0V

24.0V

30.0V

36.0V

VIN

100

120

0 0.2 0.4 0.6 0.8 1

Iout (A)

Ripple - mV

18.0V

24.0V

30.0V

36.0V

VIN

0 0.2 0.4 0.6 0.8 1

Iout (A)

Efficiency - %

36.0V

30.0V

24.0V

18.0V

VIN

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

0.0 0.2 0.4 0.6 0.8 1.0

Iout (A)

Ambient Temperature (°C)

Nat conv

60LFM

120LFM

200LFM

Airflow

Not Recommended For New Designs

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT4220/4240 Series

Using the Remote On/Off with the PT4220/4240

Isolated 10W Excalibur DC/DC Converters

For applications requiring output voltage On/Off control,

the PT4220/4240 DC/DC converter series incorporates

a “Remote On/Off” control (pin 1). This feature can be

used to switch the module off without removing the

applied input source voltage.

The converter functions normally with Pin 1 open-circuit,

providing a regulated output voltage when a valid source

voltage is applied to +Vin (pin 5), with respect to –Vin

(pin 3). When a low-level 1 ground signal is applied to

pin 1, the converter output will be turned off.

Figure 1 shows an application schematic, which details

the typical use of the Remote On/Off function. Note the

discrete transistor (Q1). The pin has its own internal

pull-up, allowing it to be controlled with an open-collector

or open-drain device (See notes 2 & 3). Table 1 gives the

threshold requirements.

When placed in the “Off” state, the standby current drawn

from the input source is typically reduced to less than 1mA.

Table 1; Pin 1 Remote On/Off Control Parameters 1

Parameter Min Typ Max

Enable (VIH) 4.5V — —

Disable (VIL) — — 0.8V

Vo/c [Open-Circuit] 5.0V

Iin [pin 1 at –Vin] — — –0.5mA

Notes:

1. The Remote On/Off control uses –Vin (pin 3) as its ground

reference. All voltages specified are with respect to –Vin.

2. Use an open-collector device (preferably a discrete

transistor) for the Remote On/Off input. A pull-up resistor

is not necessary. To disable the output voltage, the control

pin should be pulled low to less than +0.8VDC.

3. The Remote On/Off pin may be controlled with devices that

have a totem-pole output. This is provided the drive

voltage meets the threshold requirements in Table 1.

Do not apply more than +20V. If a TTL gate is used, a

pull-up resistor may be required to the logic supply voltage.

4. The PT4220/4240 converters incorporate an “Under-

Voltage Lockout” (UVLO). The UVLO will keep the

module off when the input voltage to the converter is

low, regardless of the state of the Remote On/Off control.

Table 2 gives the UVLO input voltage thresholds.

Figure 1

Turn-On Time: In the circuit of Figure 1, turning Q1 on

applies a low-voltage to pin 1 and disables the converter

output. Correspondingly, turning Q1 off allows pin 1 to

be pulled high by an internal pull-up resistor. The con-

verter produces a regulated output voltage within 60ms.

Figure 2 shows shows the output response of a PT4223

(5.0V) following the turn-off of Q1. The turn off of Q1

corresponds to the drop in Q1 Vgs. Although the rise-

time of the output voltage is short (<5ms), the indicated

delay time will vary depending upon the input voltage

and the module’s internal timing. The waveform was

measured with a 48Vdc input voltage, and a 1.4A resis-

tive load.

Figure 2

10k

BSS138

-V

Vdd

1 =OFF

Note 1

U1a

Note 1

PT4220/4240

+Vout

-Vout

+Vin

-Vin Remote

On/Off V

(adj)

5 8, 9

6, 7

Table 2; UVLO Thresholds 4

Series Vin Range UVLO Threshold

PT4220 36 – 75V 32V ±2V

PT4240 18 – 36V 15.8V ±2V

Vo (2V/Div)

Iin (0.2A/Div)

Q1Vgs (10V/Div)

HORIZ SCALE: 10ms/Div

Delay Time

Not Recommended For New Designs

Application Notes

For technical support and more information, see inside back cover or visit www.ti.com

Adjusting the Output Voltage of the 10W-Rated

Excalibur™ Series of Isolated DC/DC Converters

The factory pre-set output voltage of Power Trends’ 10W

Excalibur series of isolated DC-DC converters may be

adjusted over a narrow range. This is accomplished with

the addition of a single external resistor. For the input

voltage range specified in the data sheet, Table 1 gives the

allowable adjustment range for each model as Vo (min)

and Vo (max).

Adjust Up: An increase in the output voltage is obtained

by adding a resistor, R2 between pin 10 (Vo adjust), and

pins 6 & 7 (–Vout).

Adjust Down: Add a resistor (R1), between pin 10 (Vo adjust)

and pins 8 & 9 (+Vout).

Refer to Figure 1 and Table 2 for both the placement and value

of the required resistor, (R1) or R2.

The values of (R1) [adjust down], and R2 [adjust up], can

also be calculated using the following formulas.

(R1)= 56.2 (Va – 1.225) – RskΩ

Vo – Va

Table 1

DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS

Series Pt #

24V Bus PT4247 PT4246 PT4241 PT4245 PT4242 PT4243 PT4244

48V Bus PT4227 PT4226 PT4221 PT4225 PT4222 PT4223 PT4224

Rated Current 33A 3A 3A 3A 3A 2A 0.85A

Vo(nom) 1.3V 1.5V 1.8V 2.5V 3.3V 5.0V 12.0V

Vo(min) 1.2V 1.45V 1.7V 2.25V 2.95V 4.5V 10.8V

Vo(max) 1.4V 1.65V 1.98V 2.75V 3.65V 5.5V 13.2V

Rs (kΩΩ

ΩΩ

Ω)340.0 243.0 243.0 187.0 187.0 110.0 49.9

Figure 1

PT4220/4240

+Vout

-Vout

+Vin

-Vin Remote

On/Off V

(adj)

5 8, 9

6, 7

10 L

-V

–V

(R1)

Adj Down

Adjust Up

R2= 68.845 – RskΩ

Va – Vo

Where, Vo= Original output voltage

Va= Adjusted output voltage

Rs= Internal resistance (Table 1)

Notes:

1. Use only a single 1% resistor in either the (R1) or R2

location. Place the resistor as close to the ISR as possible.

2. Never connect capacitors to Vo adjust. Any capacitance

added to the Vo adjust control pin will affect the stability of

the ISR.

3. The output power is limited to 10W. If the output

voltage is increased, the maximum load current must be

derated according to the following equation.

Io(max) = 10

In any instance, the load current must not exceed the

converter’s rated current (See Table 1).

PT4220/4240 Series

Not Recommended For New Designs

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

continued

Table 2

DC/DC CONVERTER ADJUSTMENT RESISTOR VALUES

Series Pt #

24V Bus PT4247 PT4246 PT4241 PT4245 PT4242 PT4243 PT4244

48V Bus PT4227 PT4226 PT4221 PT4225 PT4222 PT4223 PT4224

Vo(nom) 1.3V 1.5V 1.8V 2.5V 3.3V 5.0V 12.0V

Va(req’d) Va(req’d)

R1 = (Blue) R2 = Black

1.2 (0.0)kΩ

1.25 (340.0)kΩ

1.3

1.35 340.0kΩ

1.4 0.0.0kΩ

1.45 (9.9)kΩ

1.5

1.55 1130.0kΩ

1.6 445.0kΩ

1.65 216.0kΩ

1.7 (23.9)kΩ

1.75 (347.0)kΩ

1.8

1.85 1130.0kΩ

1.9 445.0kΩ

1.95 216.0kΩ

2.25 (43.4)kΩ

2.3 (115.0)kΩ

2.35 (235.0)kΩ

2.4 (473.0)kΩ

2.45 (1190.0)kΩ

2.5

2.55 1190.0kΩ

2.6 501.0kΩ

2.65 272.0kΩ

2.7 157.0kΩ

2.75 88.4kΩ

2.95 (90.0)kΩ

3.0 (146.0)kΩ

3.05 (223.0)kΩ

3.1 (340.0)kΩ

3.15 (534.0)kΩ

3.2 (923.0)kΩ

3.25 (2090.0)kΩ

3.3

3.35 1190.0kΩ

3.4 501.0kΩ

3.45 272.0kΩ

3.5 157.0kΩ

3.55 88.4kΩ

3.6 42.5kΩ

3.65 9.7kΩ

4.5 (258.0)kΩ

4.6 (364.0)kΩ

4.7 (541.0)kΩ

4.8 (895.0)kΩ

4.9 (1960.0)kΩ

5.0

5.1 578.0kΩ

5.2 234.0kΩ

5.3 119.0kΩ

5.4 62.1kΩ

5.5 27.7kΩ

10.8 (399.0)kΩ

11.0 (499.0)kΩ

11.5 (1110.0)kΩ

12.0

12.5 87.8kΩ

13.0 18.9kΩ

13.2 7.5kΩ

PT4220/4240 Series

Not Recommended For New Designs

PACKAGE OPTION ADDENDUM

www.ti.com 28-Aug-2012

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status (1) Package Type Package

Drawing Pins Package Qty Eco Plan (2) Lead/

Ball Finish MSL Peak Temp (3) Samples

(Requires Login)

PT4242A NRND SIP MODULE EPF 10 15 TBD Call TI Level-1-215C-UNLIM

PT4242C NRND SIP MODULE EPG 10 15 TBD Call TI Level-3-215C-168HRS

PT4243A NRND SIP MODULE EPF 10 15 TBD Call TI Level-1-215C-UNLIM

PT4243C NRND SIP MODULE EPG 10 15 TBD Call TI Level-3-215C-168HRS

PT4243N NRND SIP MODULE EPE 10 15 TBD Call TI Level-1-215C-UNLIM

PT4244A NRND SIP MODULE EPF 10 15 TBD Call TI Level-1-215C-UNLIM

PT4244C NRND SIP MODULE EPG 10 15 TBD Call TI Level-3-215C-168HRS

PT4244N NRND SIP MODULE EPE 10 15 TBD Call TI Level-1-215C-UNLIM

PT4247A OBSOLETE SIP MODULE EPF 10 TBD Call TI Call TI

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability

information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.

Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that

lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.

Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between

the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.

Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight

in homogeneous material)

(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

PACKAGE OPTION ADDENDUM

www.ti.com 28-Aug-2012

Addendum-Page 2

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