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QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
Pre-bias Conditions
The QMS converters will start-up into a pre-bias voltage of
50% Vo NOM without damage.
Overvoltage Protection
The output overvoltage protection consists of a separate
control loop, independent of the primary control loop. This
Figure 26. QMS14DG, Induced OVP Behavior (typ.)
secondary control loop has a higher voltage set point than
the primary loop. In a fault condition, the converter
enters a “Hiccup” mode of operation, and ensures that the
Conditions: Vin = 36 V,
Channel 1- Vo,
Iout = 75% load.
Scale: 1 V/div., 1 sec.div.
output voltage does not exceed V ovp max.
Figure 27. QMS14DG, Induced OVP Behavior (typ.)
Figure 24. QMS25DE, Induced OVP Behavior (typ.)
Conditions: Vin = 36V,
Channel 1- Vo,
Iout = minimum load.
Scale: 1 V/div., 1 sec.div.
Conditions: Vin = 36 V,
Channel 1- Vo,
Iout = 75% load.
Scale: 1 V/div., 1 sec.div.
Figure 28. QMS07DH, Induced OVP Behavior (typ.)
QMS25, min load, 36 Vin
Figure 25. QMS25DE, Induced OVP Behavior (typ.)
Conditions: Vin = 36 V,
Channel 1- Vo,
Iout = 75% load.
Scale: 1 V/div., 1 sec.div.
Conditions: Vin = 36 V,
Iout = minimum load.
Channel 1- Vo,
MCD10143 Rev.1.1, 30--Aug-10
Scale: 1 V/div., 1 sec.div.
Page 12 of 20
Figure 29. QMS07DH, Induced OVP Behavior (typ.)
Conditions: Vin = 36 V,
Iout = minimum load.
Channel 1- Vo,
Scale: 1 V/div., 1 sec.div.
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