Input:
Output:
35-75 V
2.5 V
Current:
Package:
15 A
Eighth-brick
Technical Specification
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 website
(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 elec-
trolytic input capacitor. The recommended external input capac-
itance is specified in the “Input Characteristics” section. More
detailed information is available in the application note titled
“EMI Characteristics” on the SynQor website.
Vout(+)
Vin(+)
Vsense(+)
Electrolytic
Capacitor
External
Input
R
trim-up
or
47µF
Vin
Trim
ON/OFF
Filter
C
R
load
trim-down
Iload
_
Vsense( )
_
_
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 the specifications page).
Product # PQ60025EML15
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2EM625E Rev. C
09/08/05
Page 11
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