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DEVICE INFORMATION

PTB48500

PTB48501

PTB48502

SLTS218C – SEPTEMBER 2003 – REVISED AUGUST 2006

TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NAME

NO.

1

central office supply, this input is connected to the primary system ground.

The negative input supply for the module, and the 0 VDC reference for the Enable, EN Out, and Sync Out

5

signals. When the module is powered from a +48-V supply, this input is connected to the 48-V Return.

10

The higher regulated power output voltage, which is referenced to the COM node.

6

The lower regulated power output voltage, which is referenced to the COM node.

The secondary return reference for the module's two regulated output voltages. It is dc isolated from the input

COM

7

supply pins.

9

this pin should be left open circuit.

This is an open-collector (open-drain) positive logic input that enables the module output. This pin is

3

outputs. If not used the pin should be left unconnected.

This open-collector output may be used to enable the output of other DC/DC converters in applications where

the power-up sequence of the related voltages must be precisely controlled. The output is used principally to

EN Out

4

control the startup up of a PTB4851xx module when powering ADSL circuits based on the AC7 chipset. The

The signal generated by this pin is designed to be used exclusively with the PTB48510 in AC7 ADSL

Sync Out

2

applications. When the Sync Out of this converter is connected directly to the Sync In pin of the PTB48510,

both modules will operate at the same switch conversion frequency.

(POR: Available to PTB48500 and PTB48501 only.) This pin produces an active-low power-on reset signal that

8

signal is referenced to the COM node, and has a 3.3-k

Ω internal pull-up resistor to V

(1)

(2)

(3)

Denotes negative logic: High = Normal operation, Low = Reset

(4)

This pin is COM on the PTB48502.

6

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