PTB48600A Datasheet, PDF (1/10 Pages) Texas Instruments – 85 W Dual Complementary-Output DC/DC Converter for DSL

Not Recommended for New Designs
PTB48600 —48-V Input
85 W Dual Complementary-Output
DC/DC Converter for DSL
SLTS239 JANUARY 2005
Features
• Dual Complementary Outputs
(±5 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
• Fixed Frequency Operation
• Synchronizes with PTB4850x
• Powers line driver ICs for AC-7
and other xDSL chipsets
• Safety Approvals: (Pending)
EN60950
UL/cUL60950
Description
The PTB48600A is one of a series
of isolated DC/DC converter modules
that provide a pair of complementary
supply voltages for powering line-driver
ICs in xDSL telecom applications. These
modules operate from a standard telecom
(-48 V) central office supply and can
provide up to a 85 W of power in a bal-
anced load configuration.
The A-suffix module (±5 V) is designed
to power the line driver ICs for the AC-7
ADSL chipset. It will also power any
other applications that require a comple-
mentary supply with relatively balanced
loads. The two compliementary outputs
can also be configured as a single output
of twice the voltage magnitude. As an
example, the outputs of a PTB48600A
can be adjusted up to ±6 V, and config-
ured as a single 12-V output.
Stand-Alone Application
The PTB48600 includes an output
“on/off” enable control, output current
limit, over-temperature protection, and
input under-voltage lockout (UVLO).
The control inputs, “Enable” and
“Sync In,” are compatible with the “EN
Out” and “Sync Out” signals of the
PTB4850x DC/DC converter. This
allows the power-up and switching fre-
quency of a PTB48600 module to be
directly controlled from a PTB48500.
Together the PTB48500 and PTB48600
converters meet all the system power
and sequencing requirements of the AC-7
ADSL chipset.
The PTB48600 employs double-sided
surface mount construction. The pack-
age options include both through-hole
and surface mount pin configurations.
Pin Configuration
Pin Function
1 +VI
2 Sync In
3 Enable *
4 –VI
5 +VO
6 COM
7 VO Adjust
8 –VO
Shaded functions indicate signals
that are referenced to –Vin.
* Denotes negative logic:
Open = Outputs Off
–Vin = Normal operation
+V_I
–VI
PTB48600
1 _+VI
+VO ⁵
+VO
Complementary
Output & Load
Single-Ended
Output & Load
L
2 _{Sync In}
O
A
3 _Enable
±VO Adj ⁷
COM ⁶
COM
D
OR
L
O
A
4 _–VI
D
L
O
A
D
–VO ⁸
–V_O
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