1

+V

I

2

Sync In

3

Enable

4

-V

I

5

V

O1

6

V

7

COM

8

*V

O2

PTB4851x

L

O

A

D

L

O

A

D

COM

+V

I

-V

I

I

O1

I

O2

UDG-07040

*V

*V

Not Recommended for New Designs

PTB48510

PTB48511

www.ti.com

SLTS219F – FEBRUARY 2004 – REVISED MARCH 2007

DUAL COMPLEMENTARY-OUTPUT DC/DC CONVERTER FOR DSL

Check for Samples: PTB48510, PTB48511

1

FEATURES

•

Dual Complementary Outputs

(±5 V, ±12 V, or ±15 V)

•

Input Voltage Range: 36 V to 75 V

•

On/Off Enable for Sequencing

•

•

Overcurrent Protection

•

Overvoltage Protection (PTB48511 only)

•

Over Temperature Shutdown

DESCRIPTION

•

Undervoltage Lockout

The PTB4851x series of isolated DC/DC converter

•

Temperature Range: –40°C to 85°C

modules produce a complementary pair of regulated

•

Industry Standard Outline

supply voltages for powering line-driver devices in

•

Fixed Frequency Operation

xDSL telecom applications. The modules operate

from a standard telecom (–48 V) central office (CO)

•

Synchronizes with PTB48500

supply and can provide up to a 72 W of power in a

•

Powers Line Drivers for AC-7 and Other xDSL

balanced load configuration.

Chipsets

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

•

Safety Approvals:

line driver devices for the AC-7 ADSL chipset. Other

–

EN 60950

voltage options powers other analog applications

–

UL/cUL 60950

requiring a complementary supply with relatively

balanced loads.o

STAND-ALONE APPLICATION

Both the PTB48510 and PTB48511 include an

“on/off” enable control, output current limit, over-

temperature

protection,

and

input

under-voltage

lockout

(UVLO).

The

PTB48511

adds

output

overvoltage protection (OVP).

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 PTB4851x

modules to be directly controlled from a PTB48500.

Together the PTB48500 and PTB4851xA converters

meet

all

the

system

power

and

sequencing

requirements of the AC- ADSL chipset.

The PTB4851x uses double-sided surface mount

technology contruction. The package size is based on

the industry standard outline and does not require a

heatsink. Both through-hole and surface mount pin

configurations are available.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2007, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.