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PT4741 Datasheet

  • PT4741

  • 70-W Quad-Output DC/DC Converter for DSL

  • 10頁

  • TI

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PT4741鈥?8V
70-W Quad-Output
DC/DC Converter for DSL
SLTS167A - APRIL 2002 - REVISED NOVEMBER 2002
Features
鈥?/div>
Input Voltage: 36V to 75V
鈥?/div>
Designed for AC6 ADSL
Line-Interface Driver/Receivers
鈥?/div>
Powers up to 64 Channels
鈥?/div>
Quad Outputs (鹵8V, 鹵3.75V)
鈥?/div>
Dual Logic On/Off Control
鈥?/div>
Output Current Limit
鈥?/div>
Unbalanced Load Protection
鈥?/div>
Fixed Frequency Operation
鈥?/div>
Over-T
emperature Shutdown
Under-Voltage Lockout
1500VDC Isolation
Solderable Copper Case
Space-Saving Package
1.9 sq. in. PCB Area (suffix N)
鈥?/div>
Safety Approvals:
UL60950
CSA 22.2 950
VDE EN60950 (Pending)
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Description
The PT4741 Excalibur鈩?power
module is a 70-watt quad-output
DC/DC converter that is designed
to meet the power requirements of
Texas Instruments鈥?TNETD7112.
The TNETD7112 is a dual-channel
line-interface driver/receiver that
compliments the AC6 ADSL chipset
for use in POTS (plain old telephone
service) applications. To conserve
power, the TNETD7112 line drivers
require two pairs of complimentary
power supply voltages. These are
鹵8V and 鹵3.75V respectively.
The PT4741 module operates
from a standard (鈥?8V) telecom
central office supply and provides
all four supply voltages as two com-
plimentary balanced loads.
(This
product is not suitable for unbalanced
load applications.)
The load capacity
allows the PT4741 to operate up to
32 line-driver ICs, representing 64
ADSL channels.
The PT4741 incorporates many
features to simplify system integra-
tion. These include a flexible On/Off
enable control, input under-voltage
lock-out, and over-temperature pro-
tection. All outputs are short-circuit
protected, and internally sequenced
to meet the TNETD7112 power-up
and power-down requirements.
The module is packaged in a
space-saving solderable copper case,
requires no heat sink, and can occupy
as little as 1.9 in
2
of PCB area.
Ordering Information
PT4741o
= 鹵8.0/鹵3.75V
PT Series Suffix
(PT1234
x
)
Case/Pin
Configuration
Vertical
Horizontal
SMD
Order
Suffix
Package
Code
(EKD)
(EKA)
(EKC)
N
A
C
(Reference the applicable package code drawing for
the dimensions and PC layout)
Typical Application
To
Additional Channels
Power Filter
PT4741
鹵Vo
1
Adj
+Vo
1
1
+V
IN
21
18
Co
1
33碌F
Co
2
33碌F
+
+8V
VEEH VCCH
VEEHS VCCHS
+V
IN
COM 19
+
鈥?V
3
4
EN2
EN1
鈥揤o
1
20
錕?frac12; Dual-Channel
ADSL Driver/Receiver
(TNETD7112)
TXP
AGND
RXP
RXN
TXN
VEEL
Power Filter
VCCL
26
鹵Vo
2
Adj
+Vo
2
23
Co
3
150碌F
Co
4
150碌F
鈥揤o
2
25
+
+3.75V
DGND
鈥揤
IN
2
鈥揤
IN
COM 24
+
鈥?.75V
Co
1
, Co
2
Co
3
, Co
4
EN1 & EN2 pins:
= Required 33碌F
= Required 150碌F
See On/Off Enable Logic
For technical support and more information, see inside back cover or visit www.ti.com

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