FEATURES
High efficiency : 95.2% @ 12V/25A
Size:
57.9x36.8x11.2mm (2.28”x1.45”x0.44”)
(W/o heat spreader)
57.9*36.8*12.7mm (2.28”*1.45”0.50”)
(With heat spreader)
Standard footprint
Industry standard pin out
Fixed frequency operation
Input UVLO, Output OCP, OVP, OTP
Hiccup output over current protection
(OCP)
Hiccup output over voltage protection
(OVP)
Auto recovery OTP and input UVLO
2250V isolation and basic insulation
No minimum load required
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing
facility
UL/cUL 60950-1 (US & Canada)
recognized
Delphi Series Q48SK, Quarter Brick Family
DC/DC Power Modules:
36~75V in, 12V/25A out, 300W
The Delphi series Q48SK12025, quarter brick, 36~75V input, single output,
isolated DC/DC converter is the latest offering from a world leader in power
system and technology and manufacturing
―
Delta Electronics, Inc. This
product provides up to 300 watts of power in an industry standard footprint
and pin out. With creative design technology and optimization of component
placement, these converters possess outstanding electrical and thermal
performances, as well as extremely high reliability under highly stressful
operating conditions. The Q48SK12025 offers more than 95.2% high
efficiency at 25A full load. The Q48SK12025 is fully protected from abnormal
input/output voltage, current, and temperature conditions and meets all
safety requirements with basic insulation.
OPTIONS
Latched over current protection
Positive On/Off logic
Heat spreader available for
extended operation.
APPLICATIONS
Telecom / Datacom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial / Testing Equipment
DATASHEET
DS_Q48SK12025_07012010
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc, nominal Vout unless otherwise noted;
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Transient
Operating Hot Spot Temperature (Without heat spreader)
Operating Case Temperature (With heat spreader)
Storage Temperature
Input/Output Isolation Voltage
INPUT CHARACTERISTICS
Operating Input Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current
No-Load Input Current
Off Converter Input Current
Inrush Current (I
2
t)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
Positive Step Change in Output Current
Negative Step Change in Output Current
Settling Time (within 1% Vout nominal)
Turn-On Transient
Start-Up Time, From On/Off Control
Start-Up Time, From Input
Maximum Output Capacitance
EFFICIENCY
100% Load
60% Load
ISOLATION CHARACTERISTICS
Input to Output
Isolation Resistance
Isolation Capacitance
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On)
Logic High (Module Off)
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off)
Logic High (Module On)
ON/OFF Current (for both remote on/off logic)
Leakage Current (for both remote on/off logic)
Output Over-Voltage Protection
GENERAL SPECIFICATIONS
MTBF(with
heat spreader)
Weight(without heat spreader)
Weight(with heat spreader)
Over-Temperature Shutdown ( Without heat spreader)
Over-Temperature Shutdown
(With heat spreader)
NOTES and CONDITIONS
Q48SK12025 (Standard)
Min.
Typ.
Max.
80
100
118
112
125
2250
48
34.0
32.0
2
160
10
1
10
-30
11.4
11.7
±30
±50
±100
11.2
12.0
±80
75
36.0
34.0
11
Units
Vdc
Vdc
°C
°C
°C
Vdc
Vdc
Vdc
Vdc
Vdc
A
mA
mA
A
2
s
mA
dB
Vdc
mV
mV
mV
Vdc
mV
mV
A
%
mV
mV
µs
ms
ms
µF
%
%
2250
10
1000
160
Vdc
MΩ
pF
kHz
0.8
50
0.8
50
1
50
140
2.6
50.5
65.5
126
122
V
V
V
V
mA
uA
%
M hours
grams
grams
°C
°C
100ms
Refer to figure 18 for measuring point
Refer to figure 20 for measuring point
-40
-40
-55
36
32.0
30.0
100% Load, 36Vin
Vin=48V, Io=0A
Vin=48V, Io=0A
P-P thru 12µH inductor, 5Hz to 20MHz
120 Hz
Vin=48V, Io=0, Tc=25°C
Vin=48V, Io=Io,min to Io,max
Vin=36V to 75V, Io=Io min
Vin=48V, Tc=-40°C to 85°C
over sample load, line and temperature
5Hz to 20MHz bandwidth
Full Load, 1µF ceramic, 10µF tantalum
Full Load, 1µF ceramic, 10µF tantalum
Output Voltage 10% Low
48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
50% Io.max to 75% Io.max
75% Io.max to 50% Io.max
12.0
120
50
25
140
300
300
300
70
80
0
110
Full load;
Vin=48V
Vin=48V
95.2
94.7
20000
Von/off at Ion/off=1.0mA
Von/off at Ion/off=0.0 µA
Von/off at Ion/off=1.0mA
Von/off at Ion/off=0.0 µA
Ion/off at Von/off=0.0V
Logic High, Von/off=15V
Over full temp range; % of nominal Vout
Io=100% of Io, max; Tc=40°C;Airflow=600LFM
Refer to figure 18 for measuring point
Refer to figure 20 for measuring point
0
2
0
2
115
DS_Q48SK12025_07012010
2
ELECTRICAL CHARACTERISTICS CURVES
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0
2
4
6
8
48V
36V
75V
20
18
16
14
12
10
8
6
4
2
0
10 12 14 16 18 20 22 24 26
48V
36V
75V
0
2
4
6
8 10 12 14 16 18 20 22 24 26
Figure 1:
Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 85°C.
Figure 2:
Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 85°C.
9
8
INPUT CURRENT (A)
7
6
5
4
3
2
30
35
40
45
50
55
60
INPUT VOLTAGE (V)
65
70
75
Figure 3:
Typical full load input characteristics at room
temperature.
DS_Q48SK12025_07012010
3
ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 4:
Turn-on transient at zero load current) (20ms/div).
Top Trace: Vout; 5V/div; Bottom Trace: ON/OFF input: 2V/div.
Figure 5:
Turn-on transient at full rated load current (20
ms/div). Top Trace: Vout: 5V/div; Bottom Trace: ON/OFF input:
2V/div.
For Input Voltage Start up
Figure 6:
Turn-on transient at zero load current (20 ms/div).
Top Trace: Vout; 5V/div; Bottom Trace: input voltage: 30V/div.
Figure 7:
Turn-on transient at full rated load current (20
ms/div). Top Trace: Vout; 5V/div; Bottom Trace: input voltage:
30V/div.
DS_Q48SK12025_07012010
4
ELECTRICAL CHARACTERISTICS CURVES
Figure 8:
Output voltage response to step-change in load
current (75%-50% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF,
tantalum capacitor and 1µF ceramic capacitor. Top Trace: Vout;
100mV/div; Bottom Trace: output current: 10A/div
Figure 9:
Output voltage response to step-change in load
current (50%-75% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF,
tantalum capacitor and 1µF ceramic capacitor. Top Trace:
Vout; 100mV/div; Bottom Trace: output current: 10A/div
Figure 10:
Test set-up diagram showing measurement points
for Input Terminal Ripple Current and Input Reflected Ripple
Current.
Note: Measured input reflected-ripple current with a simulated
source Inductance (L
TEST
) of 12 µH. Capacitor Cs offset
possible battery impedance. Measure current as shown above.
Figure 11:
Input Terminal Ripple Current, i
c
, at full rated output
current and nominal input voltage with 12µH source impedance
and 33µF electrolytic capacitor (200 mA/div
，
2us/div).
DS_Q48SK12025_07012010
5
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