1FEATURES

• Dual Complementary Outputs

(±5 V, ±12 V, or ±15 V)

• Input Voltage Range: 36 V to 75 V

• On/Off Enable for Sequencing

• 1500 VDC Isolation

• Overcurrent Protection

• Overvoltage Protection (PTB48511 only)

• Over Temperature Shutdown

• Undervoltage Lockout

• Temperature Range: –40°C to 85°C

• Industry Standard Outline

• Fixed Frequency Operation

• Synchronizes with PTB48500

• Powers Line Drivers for AC-7 and Other xDSL

Chipsets

• Safety Approvals:

– EN 60950

– UL/cUL 60950

DESCRIPTION

The PTB4851x series of isolated DC/DC converter

modules produce a complementary pair of regulated

supply voltages for powering line-driver devices in

xDSL telecom applications. The modules operate

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

supply and can provide up to a 72 W of power in a balanced load configuration.

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

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

voltage options powers other analog applications

requiring a complementary supply with relatively

balanced loads.o

Both the PTB48510 and PTB48511 include an

“on/off” enable control, output current limit, overtemperature

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.