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Pin Configuration

Pin

Function

2

Sync In

3

Enable *

6

COM

Shaded functions indicate signals

* Denotes negative logic:

Open

= Outputs Off

= Normal operation

Stand-Alone Application

PTB48580 Series

Dual Complementary-Output

DC/DC Converter for DSL

Features

(±5 V, ±12 V)

36 V to 75 V

and other xDSL chipsets

EN60950

UL/cUL60950

Description

The PTB48580 series of isolated

DC/DC converter modules produce a

complementary pair of regulated supply

voltages for powering line-driver ICs in

xDSL telecom applications. The mod-

ules operate from a standard telecom

(-48 V) central office (CO) supply and

can provide up to a 30 W of power in a

balanced load configuration.

The A-suffix module (±5 V) is designed

to power the line driver ICs for the AC-7

ADSL chipset. Other voltage options will

power other analog applications requiring

a complementary supply with relatively

balanced loads. The outputs can also be

easily configured for single-ended use.

The modules incorporate an On/Off

enable control, output current limit,

over-temperature protection, and input

under-voltage lockout (UVLO) as stan-

dard features.

The control inputs, “Enable” and

“Sync In,” are compatible with the

“EN Out” and “Sync Out” signals of

the PTB48500 DC/DC converter.

This allows the power-up and switching

frequency of the PTB48580 series to be

directly controlled from a PTB48500.

Together a PTB48500 and a PTB48580A

converter meet all the system power

and sequencing requirements of an AC-7

ADSL chipset.

The PTB48580 series uses double-

sided surface mount contruction. The

package size is based on an industry

standard outline and does not require a

heatsink. Both through-hole and surface

mount pin configurations are available.

PTB48580

Enable

COM

6

8

L

O

A

D

1

3

4

COM

Sync In

7

2

5

L

O

A

D

SLTS240 DECEMBER 2004

Not Recommended for New Designs