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QMS DC-DC Series Data Sheet
Wide-Range Input, 70 to 82W Quarter-Brick Converters
Output Specifications
All specifications apply over specified input voltage, output load, and @ 40 O C ambient temperature, unless
otherwise noted.
QMS25DE: 3.3V / 25A
Parameter
Output Voltage (Set-point)
Line Regulation
Load Regulation
Temperature Coefficient
Total Error Band
1
Output Power
Conditions/Description
Vin = 36V, Io =25A
Vi =18V to 60V, Io =50% Io.max
Vin =36V, Io.min to Io.max
-40 ? C < T AMB < +85 ? C
(Line, Load, Temperature,
Ripple, Life)
w/ proper thermal derating
Min
3.25
3.12
Nom
3.30
Max
3.35
10
0.3
25
0.75
0.02
3.48
+/- 5.5
82.5
Units
VDC
mV
%
mV
%
%/ ? C
VDC
%
W
Output Current
1
w/ proper thermal derating
0
25
A
Output Current Limit Threshold
Vin = 36 V, Vo < 90%Vonom
125
150
%Iomax
Output Ripple
2
Over line and load,
-40 ? C < T AMB < +85 ? C
(DC to 20 MHz)
50
1.5
17
100
3.0
35
mV P-P
%
mV RMS
Dynamic Regulation
4
Efficiency
3
Peak Deviation
Settling Time
Peak Deviation
Settling Time
(T AMB =40 ? C)
75-100-75% load step change,
to 1% error band, Co=0 μF
Slew = 1.0A/ ? s >>>
Slew = 0.1A/ ? s >>>
Vin NOM , I O = I RATED
+/-165
500
+/-165
500
90
+/-330
1,000
+/-330
1,000
mV
? s
mV
? s
%
Turn-on Overshoot
5
Overall input voltage, load,
and temperature conditions
5
10
%Vout
Turn-On Time
f
(VIN)
5
Time from Vin=UVLO to
90% of Vout NOM
2
10
150
ms
Turn-On Time
f
(On/Off)
6
Time from enable to
90% of Vout NOM
50
250
ms
Rise Time
5
From 10 to 90% of Vout NOM
1
2
ms
Admissible Load Capacitance
7
I rated , Nom Vin
330
8,220
? F
Switching Frequency
300
kHz
see Figures 37 and 40
see Figure 18 for ripple waveform and Figure 46 for measurement method.
see Figures 12 and 15
see Figure 3
see Figure 6
see Figure 9
A minimum 330 μ F (AVX, TPSD337K006R0045) is recommended for operation over full load, line and temperature range.
Notes:
1
2
3
4
5
6
7
MCD10143 Rev.1.1, 30--Aug-10
Page 4 of 20
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