Data Sheet

March 27, 2008

QBW018A0B Series Power Modules, DC - DC Converters:

36 – 75Vdc Input; 12Vdc Output; 18A Output Current

2

Absolute Maximum Ratings

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

absolute stress ratings only, functional operation of the device 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 the device reliability.

Parameter

Device

Symbol

Min

Max

Unit

Input Voltage*

Continuous

-0.3

75

Vdc

Non- operating continuous

-0.3

80

Vdc

Operating Ambient Temperature

All

-40

85

°C

(See Thermal Considerations section)

Storage Temperature

All

-55

125

°C

I/O Isolation Voltage (100% factory Hi-Pot tested)

All

⎯

⎯

1500

Vdc

* Input over voltage protection will shutdown the output voltage when the input voltage exceeds threshold level.

Electrical Specifications

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

conditions.

Parameter

Device

Symbol

Min

Typ

Max

Unit

Operating Input Voltage

36

48

75

Vdc

Maximum Input Current

-

-

7

Adc

Inrush Transient

All

I

-

-

1

A

Input Reflected Ripple Current, peak-to-peak

All

-

24

-

mAp-p

Input Ripple Rejection (120Hz)

All

-

-50

-

dB

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

This power module can be used in a wide variety of applications, ranging from simple standalone operation to being

part of a complex power architecture. To preserve maximum flexibility, internal fusing is not included, however, to

achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a fast-

acting fuse with a maximum rating of 15 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 sheet for further information.