SLTS142C datasheet(5/14 Pages) TI1

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PT4842—48V

65-W Triple Output Isolated DC/DC

Converter for DSL Applications

PT4842 Specifications (Unless otherwise stated, the operating conditions are:- Ta =25°C, Vin =48V, and Ion =0.5Ionmax)

PT4842

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

Output Power

Each output:

Vo1 ( 12V)

—

32.4 (1)

Vo2 (3.3V)

—

(1)

Vo3 (1.8V)

—

12.6 (1)

Total (all three outputs)

—

(1)

Output Current

Io1 ( 12V)

—

2.7

Io2 (3.3V)

—

(2)

Io3 (1.8V)

—

(2)

Maximum (Io2 + Io3)

——11

(2)

Current Limit Threshold

ILIM

Io1

—4

—

Io2 + Io3

—16

—

Over Current Shutdown Delay (3)

tsd

Time period prior to latched shutdown

—

200

—

Input Voltage Range

Vin

—

Under Voltage Lockout

Von

Vin increasing

—

Voff

Vin decreasing

—

Internal Input Capacitance

Cint

—2

—µF

Output Voltage

Vo1 ( 12V)

11.64

12.0

12.36

Vo2 (3.3V)

3.2

3.3

3.4

Vo3 (1.5V)

1.74

1.8

1.86

Output Adjust Range

Voadj

Vo2 / Vo3

±10

——%Vo

Line Regulation

Regline

All outputs, Over Vin range

—

0.11

%Vo

Load Regulation

Regload

All outputs, 0

≤Io≤Iomax

—

0.2

1.0

%Vo

Cross Regulation

Regcross

Any one output vs. other outputs

—

1.0

%Vo

Vo Ripple/Noise

(4)

Cout =10µF tantalum capacitor

Vo1 ( 12V)

—

100

(0 to 20MHz bandwidth)

Vo2 (3.3V)

—

mVpp

Vo3 (1.5V)

—

Transient Response

(5)

ttr

25% load step

—

µSec

Vos

Vo over/undershoot

—

%Vo

Efficiency

Po =Pomax

—

Switching Frequency

ƒs

Over Vin and Io ranges

450

500

550

kHz

On/Off Control

Referenced to –Vin

Logic ‘0’

—

0.8

Off

Logic ‘1’

2.4

—

(6)

Open cct. voltage

Istby

Input current in ‘Off’ state

—

Primary/Secondary Isolation

V iso

1500

—

C iso

—1500

—pF

R iso

——M

Ω

Temperature Sense

(7)

Vtemp

Output voltage at temperatures:-

–40°C

—

0.1—

100°C

—

1.5

—

External Output Capacitance

(8)

Cout

Co10

—

330

Co2

—

5,000

µF

Co3

—

10,000

Notes: (1) The sum total power delivered from all three regulated outputs, Vo1, Vo2, and Vo3, cannot exceed 62 watts.

(2) The sum-total current from outputs Vo2, and Vo3 cannot exceed 11ADC.

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

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

(5) The transient response is measured with a 25% load step from Io =0.5Iomax, and di/dt =0.2A/µs.

(6) Pins 3 & 4 are diode protected and can be connected to +Vin.

(7) Voltage output at “TEMP” pin is defined by the equation:- VTEMP = 0.5 + 0.01·T, where T is the sensed temperature in degrees centigrade. See pin

descriptions for more information.

(8) 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.

SLTS142C - DECEMBER 2000 -REVISED SEPTEMBER 2002

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