PQ60050QTA30 Datasheet, PDF (11/13 Pages) SynQor Worldwide Headquarters – Quarter-brick DC/DC Converter

Technical Specification
Input: 35-75 V
Output: 5.0 V
Current: 30 A
Package: Quarter-brick
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 correcting it.
Application Circuits: Figure D below provides a typical circuit
diagram which details the input filtering and voltage trimming.
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 electrolytic input
capacitor. The recommended external input capacitance is speci-
fied in the “Input Characterisitcs” section. More detailed informa-
tion is available in the application note titled “EMI Characteristics”
on the SynQor website.
Vin(+)
Vout(+)
External
Electrolytic
Capacitor
Vsense(+)
Vin
Input
ON/OFF
Trim
Filter
Vsense(^_)
Vin(^_)
Vout(^_)
Figure D: Typical application circuit (negative logic unit, permanently enabled).
R
trim-up
or
R_trim-down
C
load
I
load
Vin(+)
C₁
C₂
Vin(^_)
Figure E: Internal Input Filter Diagram (component values
listed on page 3).
Product # PQ60050QTA30
Phone [phone]
www.synqor.com
Doc.# 005-2QT650C Rev. E
05/20/09
Page 11