PQ60120QEX25 Datasheet, PDF (12/13 Pages) SynQor Worldwide Headquarters – Quarter-brick DC/DC Converter

Technical Specification
Input: 35-75 V
Output: 12 V
Current: 25 A (300W)
Package: Quarter-brick
Application Circuits: Figure E below provides a typical circuit
diagram which details the input filtering and voltage trimming.
Input Filtering and External Input Capacitance: Figure F
below shows the internal input filter components. This filter dra-
matically reduces input terminal ripple current, which otherwise
could exceed the rating of an external electrolytic input capacitor.
The recommended external input capacitance is specified in the
Input Characteristics section on the Electrical Specifications page.
More detailed information is available in the application note
titled “EMI Characteristics” on the SynQor website.
Output Filtering and External Output Capacitance:
Figure F below shows the internal output filter components. This
filter dramatically reduces output voltage ripple. However, some
minimum external output capacitance is required, as specified in
the Output Characteristics section on the Electrical Specifications
page. No damage will occur without this capacitor connected,
but peak output voltage ripple will be much higher.
Vin(+)
Vout(+)
Electrolytic
Capacitor
Vsense(+)
Vin
External
Input
100µF
ESR @0.2W
ON/OFF
Trim
R_trim-up
or
Filter
Vsense(^_)
R_trim-down C_load
I_load
Vin(^_)
Vout(^_)
Figure E: Typical application circuit (negative logic unit, permanently enabled).
Vin(+)
C₁
Vin(^_)
L_in
C₂
Regulation
Stage
Current
Sense
Isolation
Stage
Vout(+)
Vout(^_)
Figure F: Internal Input and Output Filter Diagram (component values listed on specifications page).
Product # PQ60120QEA25
Phone [phone]
www.synqor.com
Doc.# 005-2QE612J Rev. B
03/24/09
Page 12