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PT4701鈥?8V

35-W Quad-Output

DC/DC Converter for DSL

SLTS182A - FEBRUARY 2003 - REVISED APRIL 2003

Features

鈥?/div>

Input Voltage: 36 V to 75 V

鈥?/div>

Designed for AC6 ADSL

Line-Interface Driver/Receivers

鈥?/div>

Powers up to 32 Channels

鈥?/div>

Quad Outputs (鹵8 V, 鹵3.75 V)

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

鈥?/div>

Under-Voltage Lockout

鈥?/div>

1500 VDC Isolation

鈥?/div>

Space-Saving Solderable Case

1.2 sq. in. PCB Area (suffix N)

鈥?/div>

Surface Mountable

鈥?/div>

IPC Lead Free 2

鈥?/div>

Safety Approvals: (Pending)

UL60950

CSA 22.2 950

Description

The PT4701 Excalibur鈩?power

module is a 35-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8 V and 鹵3.75 V respectively.

The PT4701 module operates

from a standard (鈥?8 V) 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 PT4701 to operate up to

16 line-driver ICs, representing 32

ADSL channels.

The PT4701 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 1.2 in

2

of PCB area.

Ordering Information

鉂?/div>

PT4701鉂?/div>

= 鹵8.0/鹵3.75 V

PT Series Suffix

(PT1234

x

)

Case/Pin

Configuration

Vertical

Horizontal

SMD

Order

Suffix

Package

Code

(ENM)

(ENN)

(ENP)

N

A

C

(Reference the applicable package code drawing for

the dimensions and PC layout)

Typical Application

To

Additional Channels

Power Filter

PT4701

鹵Vo

1

Adj

+Vo

1

+V

IN

17

14

Co

1

33 碌F

Co

2

33 碌F

+

+8 V

VEEH VCCH

VEEHS VCCHS

+V

IN

COM 15

+

鈥? V

3

4

EN2

EN1

鈥揤o

1

16

錕?frac12; Dual-Channel

ADSL Driver/Receiver

(TNETD7112)

TXP

AGND

RXP

RXN

TXN

VEEL

Power Filter

VCCL

21

鹵Vo

2

Adj

+Vo

2

18

Co

3

150 碌F

Co

4

150 碌F

鈥揤o

2

20

+

+3.75 V

DGND

鈥揤

IN

2

鈥揤

IN

COM 19

+

鈥?.75 V

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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