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.