FEATURES
High efficiency: 94.5% at 12V/38A
Industry standard Quarter brick footprint
Size: 57.9mm x 36.8mm x 12.7mm
(2.28in x 1.45in x 0.50in)
2250V isolation
Low output ripple and noise
Output over current/voltage protection
Latch after OCP & Output OVP shutdown
Over-temperature protection
Parallel operation (droop current sharing)
Power Good (POK) (option)
RoHS 6/6 (lead free)
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing
facility
UL/cUL 60950-1 (US & Canada)
Recognized, and TUV (EN60950-1)
Certified
CE mark meets 73/23/EEC and 93/68/EEC
directives
Delphi Series D48S1238, 450W Quarter Brick
DC/DC Power Modules: 48V in, 12V/38A out
The Delphi series D48S1238, quarter Brick, 43~57V 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 family provides up to 450 watts of
regulated 12V output power in an industry standard quarter brick
footprint and pinout. 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. All models are fully
protected from abnormal input/output voltage, current, and temperature
conditions. The Delphi Series converters meet all safety requirements
with basic insulation.
OPTIONS
Positive On/Off logic
Heatspreader
Case ground pin
Power Good pin
APPLICATIONS
Data Communication
Distributed power architecture
Servers and workstations
LAN / WAN applications
Data processing applications
DATASHEET
DS_D48S1238_05142009
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=300 LFM, V
in
=48Vdc, nominal Vout unless otherwise noted;
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Operating Case Temperature (open frame)
Operating Case Temperature (with heatspreader)
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
Initial Set Point Accuracy
Output Voltage Regulation
Over Load
Over Line
Total Output Voltage Range
Output Voltage Ripple and Noise
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
Rise Time
Capacitive Loading
Overshoot at Turn-On/Turn-Off
PROTECTION
Short Circuit Protection
Over Current Protection (OCP)
Over Voltage Protection (OVP)
EFFICIENCY
100% 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 Current (for both remote on/off logic)
Leakage Current (for both remote on/off logic)
Power Good Assertion Time
Power Good out of regulation
GENERAL SPECIFICATIONS
MTBF
Weight
NOTES and CONDITIONS
Please refer to Figure13
Please refer to Figure14
1 minute
D48S1238 (Standard)
Min.
43
-40
-40
-40
43
Typ.
48
Max.
57
110
90
125
2250
57
Units
Vdc
°C
°C
°C
Vdc
Vdc
Vdc
Vdc
Vdc
A
mA
mA
A
2
s
mA
dB
Vdc
Vdc
Vdc
Adc
mVp-p
A
%
Vdc
Vdc
uS
mS
mS
mS
µF
µF
Vdc
48
42
40
2
100% Load, 43Vin
TBD
TBD
P-P thru 12µH inductor, 5Hz to 20MHz
120 Hz
Vin=51.4V, Io=20A
Io=Io,min to Io,max
Vin=43V to 57V
over load, line and temperature
Cout 2200µF x2 (max ESR 20 mΩ) with 10µF Tantalum &
0.47µF Ceramic cap. 5Hz to 20MHz Bandwidth
Output Voltage 10% Low
48V, 2200µFx2pcs load cap, 0.1A/µs
50% Io.max to 75% Io.max
75% Io.max to 50% Io.max
From On/Off falling edge to 10%Vo,set
From 90% of Vin to Vo = 10%Vo,set
10% of Vo to 90% of Vo
For D48S1238-2 A/E
For D48S1238-2C
Vin=48V, Io=min-max
Withstand continuous short-circuit, latch mode
Vin=48V, Vo=12V shall exist for at least 250ms ~ 1Sec
Vin=48V
Vin=48V, Vo=12V, Io=38A
10
1000
350
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
From 90% of Vo to Power Good fell to ground
From 90% of Vo (falling) to Power Good rise
Io=80% of Io, max; Tc=40°C
Io=80% of Io, max; Tc=25°C
With heatspreader
0
12.19
11.4
11.4
11.4
35
3.75
105
11.4
11.4
TBD
0
10
1
1000
4400
TBD
TBD
TBD
12.5
TBD
TBD
TBD
12.21
12.6
12.6
12.6
70
38
130
12.6
12.6
10
40
30
25000
25000
TBD
105
12.9
94.5
130
14.2
% of Io
Vdc
%
2250
Vdc
MΩ
pF
KHz
1
0
1
1.3
61
0.8
15
1
50
10
2
V
V
mA
uA
mS
mS
M hours
grams
DS_D48S1238-2_04142009
2
ELECTRICAL CHARACTERISTICS CURVES
96
95
94
93
92
91
90
89
88
0
10
20
Output Current (A)
35
Power Dissipation (W)
30
25
20
15
10
5
0
0
10
20
30
40
Output Current (A)
48V
57V
43V
Efficiency (%)
48V
57V
43V
30
40
Figure 1:
Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25°C.
Figure 2:
Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
14
14
13
Vout (V)
13
12
12
11
11
10
48V
57V
43V
0
10
20
30
40
Output Current (A)
Figure 3:
Output voltage regulation vs. load current showing
typical current limit curves and converter shutdown point for
minimum, nominal, and maximum input voltage at room
temperature.
DS_D48S1238-2_04142009
3
ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
CH 3
CH 2
CH 3
CH 2
Figure 4:
Turn-on transient at full load current) (2ms/div).
Ch3 : Vout; 2V/div; Ch2 : ON/OFF input: 2V/div.
Figure 5:
Turn-on transient at zero load current (2 ms/div).
Ch3 : Vout; 2V/div; Ch2: ON/OFF input: 2V/div
Figure 6:
Output voltage response to step-change in load
current (50%-75%-50% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF, tantalum capacitor and 0.47µF ceramic capacitor. Trace:
Vout (500mV/div). Scope measurement should be made using
a BNC cable (length shorter than 20 inches). Position the load
between 51mm to 76mm (2 inches to 3 inches) from the
module.
DS_D48S1238-2_04142009
4
ELECTRICAL CHARACTERISTICS CURVES
Figure 7:
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 8:
Input Terminal Ripple Current, i
c
, at full rated output
current and nominal input voltage with 12µH source impedance
and 33µF electrolytic capacitor (50 mA/div).
Figure 9:
Output voltage noise and ripple measurement test
setup.
Figure 10:
Output voltage ripple at nominal input voltage and
rated load current (20mV/div). Load capacitance: 2200uF*2
electrical capacitor, 0.47µF ceramic capacitor and 10µF
tantalum capacitor. Bandwidth: 20 MHz. Scope measurement
should be made using a BNC cable (length shorter than 20
inches). Position the load between 51 mm to 76 mm (2 inches
to 3 inches) from the module.
DS_D48S1238-2_04142009
5
京公网安备 11010802033920号
EEWORLD
