Data Sheet

March 26, 2008

JHC/JHW350 Power Module; dc-dc Converter

18 – 36Vdc or 36 – 75Vdc Input; 28Vdc Output; 350W

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

JHC

-0.3

40

Vdc

Continuous

JHW

-0.3

80

Vdc

Transient (100ms)

JHC

-0.3

50

Vdc

Transient (100ms)

JHW

-0.3

100

Vdc

Operating Ambient Temperature

(See Thermal Considerations section)

All

-40

100

°C

Storage Temperature

All

-55

125

°C

I/O Isolation Voltage

All

⎯

⎯

1500

Vdc

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

JHC

18

24

36

Vdc

JHW

36

48

75

Vdc

Maximum Input Current

JHC

23

Adc

JHW

11

Adc

Inrush Transient

All

I

2

A

Input Reflected Ripple Current, peak-to-peak

All

7

15

mAp-p

Input Ripple Rejection (120Hz)

All

60

dB

Fusing Considerations

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 an

integrated part of a sophisticated 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 20A for JHW series and 30A for JHC series(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.