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QD48T0180205 DC-DC Converter Data Sheet
36-75 VDC Input; 1.8 and 2.5 VDC @ 15A Output
Electrical Specifications (continued)
Conditions: T A =25oC, Airflow=300 LFM (1.5 m/s), Vin=48 Vdc, unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX
UNITS
INPUT CHARACTERISTICS
Maximum Input Current
1.8 Vdc @ 15 Adc, 2.5 Vdc @ 15 Adc,
2.1
Adc
Vin = 36 V
Input Stand-by Current
Input No Load Current (0 load on both outputs)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
See Figure 33 - 25MHz bandwidth
120Hz
3
48
6
TBD
mAdc
mAdc
mA PK-PK
dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
2
1.8 V
2.5 V
-40oC to 85oC
-40oC to 85oC
1.787
2.480
1.805
2.505
1.823
2.530
Vdc
Vdc
Over Load
Output Regulation: Over Line
3
1.8 V
2.5 V
1.8 V
2.5 V
±2
±2
-10
-10
mV
mV
mV
mV
Cross Regulation
4
1.8 V
2.5 V
For Iout2 (2.5 V) change from 0 to 15 A
For Iout1 (1.8 V) change from 0 to 15 A
-5
-5
mV
mV
Output Voltage Range
Output Ripple and Noise - 25MHz BW
1.8 V
2.5 V
1.8 V
2.5 V
Over line, load and cross regulation
Over line, load and cross regulation
Full load + 1 μF ceramic
Full load + 1 μF ceramic
1.764
2.450
25
30
1.836
2.550
40
50
Vdc
Vdc
mV PK-PK
mV PK-PK
DYNAMIC RESPONSE
Load Change: 50% to 75% to 50%
? Iout = 25% of IoutMax
di/dt = 0.1 A/μS 1.8 V
2.5 V
Co = 10 μF tant. + 1 μF ceramic (Fig.20)
Co = 10 μF tant. + 1 μF ceramic (Fig.21)
75
60
mV
mV
Setting Time to 1%
1.8 V
2.5 V
100
100
μ s
μ s
di/dt = 5 A/μS 1.8 V
2.5 V
Co = 300 μF tant. + 1 μF ceramic (Fig.22)
Co = 300 μF tant. + 1 μF ceramic (Fig.23)
100
100
mV
mV
Setting Time to 1%
1.8 V
2.5 V
60
60
μ s
μ s
EFFICIENCY
1.8 V 100% Load, 2.5 V 100% Load
1.8 V 50% Load, 2.5 V 50% Load
Additional Notes:
86
87
%
%
2.
3.
4.
No load set point is 5 mV higher than the nominal voltage, to partially compensate voltage drop on the output pins.
Load regulation is affected with resistance of the output pins (approximately 0.3 m ? ) since there is no remote sense.
Cross regulation is affected with resistance of the RETURN pin (approximately 0.3 m ? ) since there is no remote sense.
MAY 08, 2003 revised to NOV 13, 2006
Page 3 of 15
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