65-W +/- 5-V, Dual Complementary-Output DC/DC Converter With OVP
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.
By Texas Instruments
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