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2

SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003

Pin Function

1

EN 1

2

EN 2

3+Vin

4–Vin

5

Do Not Connect

6

Pin Not Present

7

Pin Not Present

8

Pin Not Present

9

COM

10

COM

11

PT4820 Series

35-W Triple Output Isolated DC/DC

Converter for Logic Applications

Pin Function

12

13

14

COM

15

16

17

18

COM

19

20

21

On/Off Enable Logic

Pin Configuration

Pin Descriptions

Pin 1

Pin 2

Output Status

×1

Off

10

On

0×

Off

Notes:

Logic 1 =Open collector

Logic 0 = –Vin (pin 2) potential

For positive Enable function, connect pin 2

to pin 4 and use pin 1.

For negative Enable function, leave pin 1

open and use pin 2.

For automatice power-up connect pin 2 to

pin 4 and leave pin 1 open.

+Vin:

The positive input supply for the module with

respect to –Vin. When powering the module from a

–48V telecom central office supply, this input is

connected to the primary system ground.

–Vin:

The negative input supply for the module, and

the 0VDC reference for the EN 1, and EN 2 inputs.

When powering the module from a +48V supply,

this input is connected to the 48V(Return).

EN 1:

The positive logic input that activates the

module output. If not used, this pin should be left

open circuit. Connecting this input to –Vin disables

the module’s outputs.

EN 2:

The negative logic input that activates the

module output. This pin must be connected to –Vin

to enable the module’s outputs. A high impedance

disables the module’s outputs.

Vo 1:

The highest regulated output voltage, which is

referenced to the COM node.

Vo 2:

The regulated output that is designed to power

logic circuitry. It is referenced to the COM node.

Vo 3:

The low-voltage regulated output that provides

power for a µ-processor or DSP core, and is refer-

enced to the COM node.

COM:

The secondary return reference for the module’s

three regulated output voltages. It is DC isolated from

the input supply pins.

to be adjusted higher or lower than the preset value.

If not used, this pin should be left open circuit.

to be adjusted higher or lower than the preset value.

If not used, this pin should be left open circuit.

to be adjusted higher or lower than the preset value.

If not used, this pin should be left open circuit.

Note: Shaded functions indicates those pins that are at primary-side

potential. All other pins are referenced to the secondary.

Environmental Specifications

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

Ambient Temperature Range

–40

—

°C

Case Temperature

Measured at center of case

—

—

+100

°C

ShutdownTemperature

OTP

115

125

°C

Solder Reflow Temperature

Surface temperature of module pins or case

—

—

°C

Storage Temperature

—

–40

—

+125

°C

Mechanical Shock

Per Mil-STD-883D, Method 2002.3

1 msec, ½ Sine, mounted

—

500

—

G’s

Mechanical Vibration

Mil-STD-883D, Method 2007.2

Suffix A, C

—

—

G’s

20-2000 Hz

Weight

—

Vertical/Horizontal

—

50

—

grams

Flammability

—

Meets UL 94V-O

Notes:

(i) See SOA curves or consult factory for appropriate derating.

(ii) During solder reflow of SMD package version, do not elevate the module case, pins, or internal component temperatures above a peak of 215°C. For

further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051).

(iii) The case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing.