Product # PQ60018HPAA0

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-2HP618A Rev. C

3/08/05

Page 11

Input:

Input:

Output:

Output:

Current:

Current:

P

ackage:

35-75 V

35-75 V

1.8 V

1.8 V

100 A

100 A

Half-brick

Half-brick

T

pecification

200 ms the converter will automatically restart.

Over-Temperature Shutdown: A temperature sensor on the

converter senses the average temperature of the module. The

thermal shutdown circuit is designed to turn the converter off

when the temperature at the sensed location reaches the Over-

Temperature Shutdown value. It will allow the converter to turn on

again when the temperature of the sensed location falls by the

amount of the Over-Temperature Shutdown Restart Hysteresis

value.

APPLICATION CONSIDERATIONS

Input System Instability: This condition can occur because

any DC/DC converter appears incrementally as a negative

resistance load. A detailed application note titled “Input

System Instability” is available on the SynQor web site

(www.synqor.com) which provides an understanding of why

this instability arises, and shows the preferred solution for cor-

recting it.

Application Circuits: Figure D below provides a typical cir-

cuit diagram which details the input filtering and voltage trim-

ming.

Input Filtering and External Capacitance: Figure E below

provides a diagram showing the internal input filter components.

This filter dramatically reduces input terminal ripple current,

which otherwise could exceed the rating of an external input

electrolytic capacitor. The recommended external input capaci-

tance is specified in the “Input Characteristics” section. More

detailed information is available in the application note titled

“EMI Characteristics” on the SynQor website.

External

Input

Filter

Trim

L

or

ON/OFF

Figure D: Typical application circuit (negative logic unit, permanently enabled).

Electrolytic

Capacitor

47µF