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Pin Function

1+Vin

2–Vin

3

EN 1

4

EN 2

5

TEMP

6

Do Not Connect

7

Do Not Connect

8

Pin Not Present

9

Pin Not Present

PT4840 Series—48V

65-W Triple Output Isolated DC/DC

Converter for DSL Applications

Pin Function

10

Pin Not Present

11

12

COM

13

COM

14

Pin Not Present

Pin Function

18

COM

19

COM

20

COM

22

23

24

Pin Not Present

25

Do Not Connect

26

Do Not Connect

On/Off Enable Logic

Pin Configuration

Pin Descriptions

Pin 3

Pin 4

Output Status

1

×

Off

01On

×

0

Off

Notes:

Logic 1 =Open collector

Logic 0 = –Vin (pin 2) potential

For positive Enable function, connect pin 3

to pin 2 and use pin 4.

For negative Enable function, leave pin 4

open and use pin 3.

+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, EN 2, and TEMP

inputs. When powering the module from a +48V

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

EN 1:

The negative logic input that activates the

low-level voltage at this pin enables the module’s

outputs, and a high impedance impedance disables

the module’s outputs. If not used, the pin must be

EN 2:

The positive logic input that activates the

high impedance at this pin enables the module’s

outputs. If not used, the pin should be left open

circuit.

TEMP:

This pin produces an output signal that tracks

a temperature that is approximately the module’s

metal case. The output voltage is referenced to –Vin

and rises approximately 10mV/°C from an intital

value of 0.1VDC at –40°C. The signal is available

whenever the module is supplied with a valid input

voltage, and is independant of the enable logic status.

Ω will adversly

affect the module’s over-temperature shutdown threshold.

Use a high-impedance input when monitoring this signal.)

Vo 1:

The highest regulated output voltage, which is

referenced to the COM node. The output may be

used to power analog support circuitry.

Vo 2:

The regulated output that is designed to power

logic or I/O circuitry. It is referenced to the COM

node.

Vo 3:

The low-voltage regulated output that provides

power for a micro, processor, ASIC, or DSP core,

and is referenced 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.

Note: Shaded functions indicate those pins that are at primary-side potential.

SLTS142C - DECEMBER 2000 -REVISED SEPTEMBER 2002

Environmental Specifications

Characteristics

Symbols

Conditions

Min

Typ

Max

Units

Operating Temperature Range

–40

—

°C

Over-Temperature Protection

OTP

Case temperature

100

—

—

°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 N

—

—

G’s

20-2000 Hz

Suffix A, C

—

—

Weight

—

Vertical/Horizontal

—

90

—

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