PQ65180QGA06 Datasheet, PDF (11/13 Pages) SynQor Worldwide Headquarters – 100 Watt, No Heatsink, Isolated DC/DC Converter

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.
Technical Specification
Quarter
Brick
48Vin 18Vout 5.6A
More detailed information is available in the application note
titled “EMI Characteristics” on the SynQor website.
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 com-
ponents. 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 specified in the “Input Characterisitcs” section.
Vin(+)
Vout(+)
Electrolytic
Vsense(+)
Vin
External
Input
Capacitor
47µF
ON/OFF
R_trim-up
Trim
or
Filter
Vsense(^_)
R_trim-down C_load
I_load
Vin(^_)
Vout(^_)
Figure D: Typical application circuit (negative logic unit, permanently enabled).
L
Vin(+)
C
Vin(^_)
Figure E: Internal Input Filter Diagram (component values listed on page 3).
Product # PQ65180QGA06
Phone [phone]
Doc.# 005-2QG581D Rev. B
9/14/04
Page 11