The PTB4851x 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 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
ICs for the AC-7 ADSL
chipset. Other voltage options will power 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, over-temperature protection, and input under-voltage lockout (UVLO). The PTB48511
adds output over-voltage 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.