FEATURES

· Dual Outputs (Independently Regulated)

· Input Voltage Range: 36 V to 75 V

· Power-Up/Down Sequencing

· 1500 VDC Isolation

· Over-Current Protection

· Over-Temperature Shutdown

· Under-Voltage Lockout

· Fixed Frequency Operation

· Temp Range: –40°C to 85°C

· Industry Standard Outline

· Operates with PTB4851x for Complete AC7

Power Solution

· Powers up to 64 DSL Ports

· Safety Approvals:

– UL/cUL 60950

– EN 60950

DESCRIPTION

The PTB4850x power modules are a dual-output

isolated DC/DC converter, designed to provide the

logic supply voltages for AC-7 based xDSL

applications. The PTB48500 is rated for 13 A of total

output current, making it suitable for 32-channel

xDSL applications. The PTB48501 and PTB48502

provide output current for powering up to 64 xDSL

channels. The PTB48501 is rated for 16.5 A total

output current, and the PTB48502, 21 A. The

PTB48502 incorporates 10 W of additional capacity

for powering peripheral circuitry. Any of these

converters can be used for other applications with

similar power requirements.

The modules operate from a standard telecom

(–48 V) central office (CO) supply and include an

on/off enable control, output current limit,

over-temperature protection, input under-voltage

lockout (UVLO). The PTB48500 and PTB48501 also

incorporates a power-up reset (POR) output.

The modules are designed to operate with one of the

PTB4851x DC/DC converter modules. The

combination of PTB4850x and PTB4851x converter

provides the complete the power supply for an AC7

chipset. The EN Out and Sync Out pins provide

compatible output signals for controlling both the

power up sequence and switching frequency the

PTB48510.

The PTB4850x modules employ double-sided

surface mount construction, and are an industry

standard size.