Features
• Dual Complementary Outputs
(±5 V, ±12 V)
• Input Voltage Range:
36 V to 75 V
• On/Off Enable for Sequencing
• 1500 VDC Isolation
• Over-Current Protection
• Over-Temperature Shutdown
• Under-Voltage Lockout
• Temp Range: –40 to +85 °C
• Industry Standard Outline
• Fixed Frequency Operation
• Synchronizes with PTB48500
• Powers line driver ICs for AC-7
and other xDSL chipsets
• Safety Approvals: (Pending):
EN60950
UL/cUL60950

Description
The PTB48580 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 30 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. The outputs can also be
easily configured for single-ended use.
The modules incorporate an On/Off
enable control, output current limit,
over-temperature protection, and input
under-voltage lockout (UVLO) as standard
features.
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 PTB48580 series to be
directly controlled from a PTB48500.
Together a PTB48500 and a PTB48580A
converter meet all the system power
and sequencing requirements of an AC-7
ADSL chipset.
The PTB48580 series uses doublesided
surface mount contruction. The
package size is based on an industry
standard outline and does not require a
heatsink. Both through-hole and surface
mount pin configurations are available.