2

Tyco Electronics Corp.

Advance Data Sheet

March 1999

36 Vdc to 75 Vdc Inputs; 25 W

LW025 Single-Output-Series Power Modules:

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the devices. These are

absolute stress ratings only. Functional operation of the devices is not implied at these or any other conditions in

excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for

extended periods can adversely affect device reliability.

* Maximum case temperature varies based on power dissipation. See derating curves, Figures 15—16, for details.

Electrical Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature

conditions.

Table 1. Input Specifications

Fusing Considerations

CAUTION: This power module is not internally fused. An input line fuse must always be used.

This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone

operation to an integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fus-

ing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. The

safety agencies require a normal-blow fuse with a maximum rating of 5 A (see Safety Considerations section).

Based on the information provided in this data sheet on inrush energy and maximum dc input current, the same

type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data for further information.

Parameter

Symbol

Min

Max

Unit

Input Voltage:

Continuous

Transient (100 ms)

0

0

80

100

Vdc

V

Operating Case Temperature (See Figure 16.)

–40

110*

°C

Storage Temperature

–40

120

°C

I/O Isolation Voltage

—

—

1500

Vdc

Parameter

Symbol

Min

Typ

Max

Unit

Operating Input Voltage

36

48

75

Vdc

Maximum Input Current

——

1.2

A

Inrush Transient

—

0.1

Input Reflected-ripple Current

(50 Hz to 20 MHz; 12 µH source impedance,

—3

—

mAp-p

Input Ripple Rejection (100 Hz—120 Hz)

—

—

60

—

dB