Technical Specification
Quarter
48V 3.3/1.8V
77W
out
in
Brick Dual
DQ63318QGL08 ELECTRICAL CHARACTERISTICS
TA=25°C, airflow rate=300 LFM, Vin=48Vdc unless otherwise noted; full operating temperature range is -40°C to +100°C ambient
temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
Typ.
Max.
Units Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
100
80
V
V
continuous
Operating
continuous
Operating Transient Protection
100
2000
100
125
18
V
100ms transient
Basic level, Pollution Degree 2
Isolation Voltage (input to output)
Operating Temperature
V
-40
-55
-2
°C
°C
V
Storage Temperature
Voltage at ON/OFF input pin
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
35
48
75
V
32
28.5
2.5
33
29.5
3.5
34
30.5
4.5
3
V
V
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
V
Maximum Input Current
A
100% Load, 35 Vin
No-Load Input Current
60
2
80
3
mA
mA
Disabled Input Current
2
Inrush Current Transient Rating
Response to Input Transient
0.03
5
A s
mV
mA
A
1000V/ms input transient
Input Reflected-Ripple Current
Recommended Input Fuse
3
RMS thru 10µH inductor; Figs. 17 & 19
fast blow external fuse recommended
20
Input Filter Component Values (L\C)
Recommended External Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage Set Point (1.8V)
Output Voltage Set Point (3.3V)
Output Voltage Regulation (1.8V)
Over Line
4.7\1x2
47
µH\µF internal values, see Figure E
33
µF
see Figure 17
1.76
3.26
1.80
3.30
1.84
3.34
V
V
48Vin, 50% load on each voltage
48Vin, 50% load on each voltage
+
+
+
0.05 \ 2
0.8 \ 15
0.15 \ 5
1.7 \ 30
%\mV
%\mV
mV
+
Over Load
+
+
50
Over Temperature
30
Total Output Voltage Regulation (3.3V)
Over Line
+
+
+
+
0.05 \ 2
0.5 \ 17
0.15 \ 5
1.0 \ 33
%\mV
%\mV
mV
Over Load
+
+
Over Temperature
50
70
Total Output Voltage Range (1.8V)
Total Output Voltage Range (3.3V)
Output Voltage Ripple and Noise (1.8V & 3.3V)
Peak-to-Peak
1.72
3.19
1.88
V
over sample, line, load, temperature & life
over sample, line, load, temperature & life
20MHz bandwidth; Fig. 17 & 20
Full Load, see Figures 17 & 20
3.41
V
50
100
20
mV
mV
A
RMS
10
Full Load, see Figures 17 & 2
Operating Output Current Range (1.8V)
Operating Output Current Range (3.3V)
Output DC Current-Limit Inception (1.8V)
Output DC Current-Limit Inception (3.3V)
Short-Circuit Protection - redundant shutdown (1.8V)
Short-Circuit Protection - redundant shutdown (3.3V)
Output DC Current-Limit Shutdown Voltage (1.8V)
Output DC Current-Limit Shutdown Voltage (3.3V)
Back-Drive Current Limit while Enabled
Back-Drive Current Limit while Disabled
Maximum Output Capacitance (1.8V)
Maximum Output Capacitance (3.3V)
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection (1.8V \ 3.3V)
Output Voltage during Load Current Transient
Step Change in 1.8V Output Current (.1A/µs)
Step Change in 3.3V Output Current (.1A/µs)
Settling Time
0
15
0
15
A
15.2
15.2
17
17
19.4
19.4
A
Output Voltage 10% Low; Figs. 21-22
Output Voltage 10% Low; Figs. 21-22
Figures 23-24
A
17
A
17
A
Figures 23-24
0.6
1.0
1.0
10
V
V
A
Negative current drawn from output
Negative current drawn from output
1.8V at 15A resistive load
mA
mF
mF
10
10
3.3V at 15A resistive load
80\80
dB
120 Hz; Figs. 27-28
100
100
300
mV
mV
µs
50% to 75% to 50% Iout max; Figure 15
50% to 75% to 50% Iout max; Figure 16
to within 1% Vout nom
Turn-On Transient
Turn-On Time
6
200
0
12
ms
ms
%
Full load, Vout=90% nom.; Figs. 13 & 14
-40°C to +125°C; Figure F
Start-Up Inhibit Time
180
215
Output Voltage Overshoot
10mF load capacitance, Iout = 0A
EFFICIENCY
100% Load
87.5
87.5
%
%
48Vin, 100% load each Vout; Figs 1 - 6
48Vin, 50% load each Vout; Figs 1 - 6
50% Load
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
125
125
125
°C
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 7 - 12 for derating curves
Transformer Temperature
Product # DQ63318QGL08
Phone 1-888-567-9596
Doc.# 005-2DQ638D Rev. B
10/7/03
Page 3
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