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PT4841—48V

65-W Triple Output Isolated DC/DC

Converter for DSL Applications

PT4841 Electrical Specifications

PT4841

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

Output Power

Each output:

—

—

—

—

W

—

—

Total (all three outputs)

—

—

W

Output Current

0

—

2.7

0

—

6

(2)

A

0

—

7

(2)

——11

(2)

A

Input Voltage Range

36

—

75

V

Set-Point Voltage

—

15.2

—

—

3.3

—

V

—1.5

—

Temperature Variation

–40°C

—

±0.5

—

—

±0.8

—

Line Regulation

—

0.10.5

Load Regulation

All outputs, 0

—

0.2

0.5

Cross Regulation

Any one output vs. other outputs

—

—

1.0

Total Output Voltage Variation

Includes set-point, line, load,

15

—

–40°C

3.2

—

3.4

(3)

V

1.45

—

Efficiency

η

—

85

—

%

—50

(0 to 20MHz bandwidth)

—20

—20

Transient Response

—

30

—

µSec

—

5

—

Output Adjust Range

±10

Current Limit Threshold

—4

—

A

—16

—

Over Current Shutdown Delay

Time period prior to latched shutdown

—

—ms

Switching Frequency

450

500

550

kHz

Under Voltage Lockout

—

34

—

V

—

32

—

Enable Control (pins 2 & 3)

High-Level Input Voltage

4.0

—

V

Low-Level Input Voltage

–0.2

—

Low-Level Input Current

—

0.16

0.25

mA

Standby Input Current

pins 2 & 4 connected

—

8

mA

Internal Input Capacitance

—2

—µF

External Output Capacitance

0

—

330

(7)

0

—

µF

0

—

Temperature Sense

Output voltage at temperatures:-

–40°C

—

—

V

100°C

—

—

Primary/Secondary Isolation

1500

—

—

V

—1500

—pF

10

——M

Ω

(3) Limits are guaranteed by design.

(4) The ripple and noise is measured with a 10µF tantalum capacitor across each output.

(5) After latched shutdown, the module may be reset cycling the input power.

input power is applied. The maximum open-circuit voltage is 5.1V.

(7) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. For more information refer to the application

note regarding capacitor selection.

descriptions for more information.

SLTS142C - DECEMBER 2000 -REVISED SEPTEMBER 2002