60

Application Notes

Mechanical Outline

Product Selector Guide

Revised 5/15/98

PT4205

3-7 WATT 24V INPUT

ISOLATED DC-DC CONVERTER

Ordering Information

Through-Hole

PT4205A = 3.3V/1.8A

PT4206A = 5V/1.2A

Surface Mount

PT4205C = 3.3V/1.8A

PT4206C = 5V/1.2A

Pin-Out Information

Pin

Function

3

Do not connect

4

Do not connect

5

Do not connect

6

Do not connect

7

Sync input

8*

9*

Nominal output

voltage resistor

10

Turn-on/off input

voltage adjust

11

Remote on/off

12

Do not connect

13

Do not connect

14

Do not connect

15

Do not connect

16

Do not connect

17

+Vin

18

-Vin

* Please note that when the

Vout adjust is not used, pin 8

must be connected to pin 9.

18V to 36V

Power Trends’ PT4205 series of isolated DC to

DC converters advance the state-of-the-art for board-

mounted converters by employing high switching

frequencies, thick-film technology and a high degree

of silicon integration. The high reliability and very low

package height makes these converters ideal for

Telecom and Datacom applications requiring input-

to-output isolation with board spacing down to 0.6”.

The PT4205 series is offered in a unique molded

through-hole or SMD-DIP package with single

output voltages of 3.3V and 5V.

Series

(For dimensions and PC

board layout, see Package

Style 900.)

Specifications

Characteristics

PT4205 SERIES

(T

Symbols

Conditions

Min

Typ

Max

Units

Output Current

0

—

1.8

A

0

—

1.2

A

Current Limit

2.0

—

3.0

A

1.3

1.6

2.4

A

On/Off Standby Current

—

0.5

—

mA

Short Circuit Current

—

2.5

—

A

—

2.0

—

A

Inrush Current

—

0.6

1.0

A

On start-up

—

1.0

2.0

mSec

Input Voltage Range

18**

24

36

V

Output Voltage Tolerance

—

±4

—

Idling Voltage

—

3.65

4.0

V

—

5.6

6.0

V

Ripple Rejection

RR

—

60

—

dB

Line Regulation

—

±0.5

—

Load Regulation

—

±3

—

—

30

70

Transient Response

50% load change

—

100

300

µSec

—

3.0

5.0

Efficiency

η

—

79

—

%

—

84

—

%

Switching Frequency

520

—

688

kHz

Pin Temperature

@ Pin 1

—

—

+95

°C

Operating Temperature

-40

—

+85

°C

Free air convection, (40-60LFM)

Storage Temperature

—

-55

—

+125

°C

Mechanical Shock

—

Per Mil-STD-202F, Method 213B,

—50

—

G’s

6mS, half-sine, mounted to a PCB

Mechanical Vibration

—

Per Mil-STD-202F, Method 204D,

—10

—

G’s

10-500Hz, mounted to a PCB

Weight

—

—

—

20

—

grams

Isolation

—

—

1500

—

—

VDC

Flammability

—

Materials meet UL 94V-0

** Minimum input voltage is adjustable - See application note.

Standard Application

PT4205

18

17

16

15

14

13

12

11

10

1

2

3

4

5

6

7

8

9

-Vin

+Vin

NC

RC

TOA

+Vout

-Vout

NC

S y nc

Vad j

NOR