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Pin Function

1+Vin

2–Vin

3

EN 2

4

EN 1

5

Do Not Connect

6

Do Not Connect

7

Do Not Connect

On/Off Enable Logic

Pin Descriptions

Pin 3

Pin 4

Output Status

×1

Off

10

On

0×

Off

Notes:

Logic 1 =Open collector

Logic 0 = –Vin (pin 2) potential

For positive Enable function, connect pin 4

to pin 2 and use pin 3.

For negative Enable function, leave pin 3

open and use pin 4.

+Vin:

The positive input supply for the module with

–48-V telecom central office supply, this input is

connected to the primary system ground.

–Vin:

The negative input supply for the module, and

the 0-VDC reference for the EN 1, and EN 2 inputs.

When powering the module from a +48-V supply,

this input is connected to the input source return.

EN 1:

The negative logic input that activates the

to enable the module’s outputs. A high impedance

disables the module’s outputs.

EN 2:

The positive logic input that activates the

module output. If not used, this pin should be left

the module’s outputs.

+Vo 1:

This is the positive DC output voltage with

–Vo 1:

The negative output supply voltage with

secondary ground, a positive voltage is produced at

+Vo 2:

This is the positive DC output voltage with

node is connected to the secondary ground, a nega-

–Vo 2:

The negative output supply voltage with

secondary ground, a positive voltage is produced

Using a single resistor, this pin allows

higher or lower by up to 10%. If not used this pin

should be left open circuit.

Using a single resistor, this pin allows

higher or lower by up to 10%. If not used this pin

should be left open circuit.

Pin Function

8

Pin Not Present

9

Pin Not Present

10

Pin Not Present

11

Pin Not Present

12

Pin Not Present

13

Pin Not Present

14

Pin Configuration

Note: Shaded functions indicates those pins that are at primary-side

potential. All other pins are referenced to the secondary.

Pin Function

15

Not Connected

16

17

18

19

Not Connected

20

21

PT4711—48V

45-W Dual-Output Isolated

DC/DC Converter

SLTS225 APRIL 2004