PTB48510 Datasheet, PDF (1/13 Pages) Texas Instruments – Dual Complementary-Output DC/DC Converter for DSL

PTB48510, PTB48511
Dual Complementary-Output
DC/DC Converter for DSL
SLTS219C - FEBRUARY 2004 - REVISED OCTOBER 2004
Features
• 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
• Over-Current Protection
• Over Voltage Protection
(PTB48511 only)
• Over-Temperature Shutdown
• Under-Voltage Lockout
• Temp Range: –40 to +100 °C
• Industry Standard Outline
• Fixed Frequency Operation
• Synchronizes with PTB48500
• Powers line driver ICs for AC-7
and other xDSL chipsets
• Safety Approvals:
EN60950
UL/cUL60950
Description
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 mod-
ules 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.
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 fre-
quency 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-7
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.
Pin Configuration
Pin Function
1 +Vin
2 Sync In
3 Enable *
4 –Vin
5 +Vout
6 COM
7 Vo Adjust
8 –Vout
Shaded functions indicate signals
that are referenced to –Vin.
* Denotes negative logic:
Open = Outputs Off
–Vin = Normal operation
Stand-Alone Application
+VIN
–VIN
PTB4851x
1 _+Vin
+VOUT ⁵
+VOUT
L
2 _{Sync In}
O
A
3 _Enable
±Vo Adj ⁷
COM ⁶
COM
D
4 _–Vin
L
O
A
D
–VOUT ⁸
–V_OUT
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