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PT4660 Series

30-A Dual Output Isolated

DC/DC Converter

Pin Descriptions

+Vin:

The positive input supply for the module with respect

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, EN 2, TEMP, and AUX

signals. When the module is powered from a +48-V supply,

this input is connected to the 48-V Return.

EN 1:

This an open-collector (open-drain) negative logic

input that enables the module output. This pin is TTL

enables the module’s outputs, and a logic ‘1’ or high

impedance disables the module’s outputs. If not used,

EN 2:

An open-collector (open-drain) positive logic input

that enables the module output. This pin is TTL compat-

enables the module’s outputs. If not used, the pin should

be left open circuit.

AUX:

Produces a regulated output voltage of 11.6 V ±5 %,

pin must be limited to 10mA. The voltage may be used

to indicate the output status of the module to a primary

referenced circuit, or power a low-current amplifer.

TEMP:

This is the output voltage produced by the module’s

internal temperature sensor. The voltage at this pin is

from an intital value of 0.1 VDC at –40 °C.

The signal is available whenever the module is supplied

with a valid input voltage, and is independant of the enable

Ω will

adversly affect the module’s over-temperature shutdown threshold.

Use a high-impedance input when monitoring this signal.)

The higher regulated output voltage, which is refer-

enced to the COM node.

The lower regulated output voltage, which is refer-

enced to the COM node.

COM:

The secondary return reference for the module’s two

regulated output voltages. It is dc isolated from the input

supply pins.

be adjusted higher or lower than the preset value. If not

used, this pin should be left open circuit.

be adjusted higher or lower than the preset value. If not

used, this pin should be left open circuit.

On/Off Logic

Pin 3

Pin 4

Output Status

1

×

Off

01

On

×

0

Off

Pin-Out Information

Pin

Function

1+Vin

2-Vin

3

EN 1

4

EN 2

5

TEMP

6

AUX

7

Do Not Connect

8

Do Not Connect

Pin

Function

10

11

12

13

14

COM

15

COM

16

COM

17

COM

18

COM

Notes:

Logic 1 =Open collector

Logic 0 = –Vin (pin 2) potential

For positive Enable function, connect pin 3

to pin 2 and use pin 4.

For negative Enable function, leave pin 4

open and use pin 3.

Note: Shaded functions indicate signals that are

referenced to the input (-Vin) potential.

Pin

Function

19

COM

20

21

+Vo

2

22

+Vo

2

23

+Vo

2

24

+Vo

2

25

Do Not Connect

26

Do Not Connect

SLTS140C – MAY 2001 – REVISED OCTOBER 2003