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PTB48500 Datasheet(PDF) 1 Page - Texas Instruments

Part No. PTB48500
Description  Dual-Output, 48-V Input Isolated DC/DC Converter for xDSL
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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PTB48500 Datasheet(HTML) 1 Page - Texas Instruments

 
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For technical support and further information visit http://power.ti.com
Stand-Alone Application
Pin Configuration
Pin
Function
1+VI
2
Sync Out
3
Enable #
4
EN Out
5–VI
6+VO 2
7
COM
8
POR* / COM †
9Vo2 Adjust
10
+VO 1
Shaded functions indicate signals
that are referenced to –VI.
# Denotes positive logic:
Open
= Normal operation
–VI
= Outputs Off
* Denotes negative logic:
High
= Normal operation
Low
= Reset
† This pin is COM on the PTB48502
Features
Dual Outputs
(Independently Regulated)
Input Voltage Range:
36 V to 75 V
Power-up/Down Sequencing
1500 VDC Isolation
Over-Current Protection
Over-Temperature Shutdown
Under-Voltage Lockout
Fixed Frequency Operation
Temp Range: –40 to 100 °C
Industry Standard Outline
Operates with PTB4851x for
Complete AC7 Power Solution
Powers up to 64 DSL Ports
Safety Approvals:
UL/cUL 60950
EN 60950
Description
The PTB4850x power modules are a
dual-output isolated DC/DC converter,
designed to provide the logic supply volt-
ages for AC-7 based xDSL applications.
The PTB48500 is rated for 13 A of total
output current, making it suitable for
32-channel xDSL applications. The
PTB48501 and PTB48502 provide output
current for powering up to 64 xDSL chan-
nels. The PTB48501 is rated for 16.5 A
total output current, and the PTB48502,
21 A. The PTB48502 incorporates 10 W
of additional capacity for powering periph-
eral circuitry. Any of these converters can
be used for other applications with simi-
lar power requirements.
The modules operate from a standard
telecom (-48 V) central office (CO) supply
and include an “on/off” enable control,
output current limit, over-temperature
protection, input under-voltage lockout
(UVLO). The PTB48500 and PTB48501
also incorporates a power-up reset (POR)
output.
The modules are designed to operate
with one of the PTB4851x DC/DC con-
verter modules. The combination of a
PTB4850x and PTB4851x converter
provides the complete the power supply
for an AC7 chipset. The “EN Out” and
“Sync Out” pins provide compatible out-
put signals for controlling both the power
up sequence and switching frequency of
the PTB48510.
The PTB4850x modules employ
double-sided surface mount construction,
and are an industry standard size.
PTB4850x
+VI
Enable
–VI
Vo1
Vo2
COM
10
6
7, (8) *
L
O
A
D
L
O
A
D
Vo1
Vo2
+VI
–VI
1
3
5
COM
Sync Out
EN Out
Vo2 Adj
2
4
9
(8) *
POR
* Pin 8 is ‘COM’ on PTB48502
PTB48500, PTB48501, PTB48502
Dual-Output, 48-V Input Isolated
DC/DC Converter for xDSL
SLTS218B - SEPTEMBER 2003 - REVISED NOVEMBER 2004


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