FEATURES
High efficiency: 84.5% @ 3.3V/3A
Standard footprint: 2.0” ×1.0”
Industry standard pin out
Low profile
Open Frame: 9.1mm (0.36”)
Encapsulated: 10.7mm (0.42”)
Fixed frequency operation
Input UVLO, Output OCP, OVP
No minimum load required
2:1 input voltage range
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing
facility
UL/cUL 60950 (US & Canada)
Recognized, and TUV (EN60950)
Certified
CE mark meets 73/23/EEC and
93/68/EEC directives
Delphi Series S48SR, 15W 2”x1” Family
DC/DC Power Modules: 48V in, 3.3V/3A out
OPTIONS
The Delphi Series S48SR printed circuit board mounted, 48V input,
single output, isolated DC/DC converters are the latest offering from a
world leader in power system and technology and manufacturing
―
Delta Electronics, Inc. This product family provides up to 15 watts of
power or up to 4.5A of output current (for 3.3V and below) in an industry
standard footprint. With creative design technology and optimization of
component placement, the Delphi Series Small Power converters
possess outstanding electrical and thermal performance, as well as
extremely high reliability under highly stressful operating conditions. All
models are protected from abnormal input/output voltage and current
conditions. An encapsulated version is available for the most robust
performance in harsh environments.
Short pin lengths
APPLICATIONS
Telecom/DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Test Equipment
DATASHEET
DS_S48SR3R303_04102006
1
Delta Electronics, Inc.
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 (100ms)
Operating Case Temperature
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
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 to 1% of Final value
Turn-On Transient
Start-Up Time, From Input
Maximum Output Capacitance
EFFICIENCY
100% Load
ISOLATION CHARACTERISTICS
Isolation Voltage
Isolation Resistance
Isolation Capacitance
FEATURE CHARACTERISTICS
Switching Frequency
Output Voltage Trim Range
Output Over-Voltage Protection
GENERAL SPECIFICATIONS
Calculated MTBF
Weight (Encapsulated)
Weight (Open Frame)
NOTES and CONDITIONS
S48SR3R303ER A/B/C/D
Min.
Typ.
Max.
80
100
100
125
48
34.5
33.5
2
25
0.01
5
50
3.23
3.30
±5
±5
100
TBD
50
15
0
3.6
5.5
50
50
600
35
3.37
±15
±15
300
TBD
100
25
3
6.5
75
75
50
470
75
35.8
34.5
3
0.5
Units
Vdc
Vdc
°C
°C
Vdc
V
V
V
V
A
mA
A
2
s
mA
dB
V
mV
mV
ppm/℃
V
mV
mV
A
A
mV
mV
µs
ms
µF
%
V
MΩ
pF
+10
140
kHz
%
%
M hours
grams
grams
100ms
1 minute
-40
-55
1500
36
33.8
32.0
1
100% Load, 36Vin
P-P thru 12µH inductor, 5Hz to 20MHz
120 Hz
Vin=48V, Io=50%Io.max, Tc=25℃
Io=Io,min to Io,max
Vin=36V to 75V
Tc=-40℃ to 100℃
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
Full load; 5% overshoot of Vout at startup
82
1500
100
500
290
Across Trim Pin & +Vo or –Vo, Pout≦max rated
Over full temp range; % of nominal Vout
Io=80% of Io, max; Tc=40°C
-10
115
125
3
25.5
12.5
84.5
2
ELECTRICAL CHARACTERISTICS CURVES
36Vin
48Vin
75Vin
POWER DISSIPATION (W)
EFFICIENCY (%)
90
85
80
75
70
65
60
55
50
0.5
1
1.5
2
2.5
3
OUTPUT CURRENT (A)
4.0
36Vin
48Vin
75Vin
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.5
1
1.5
2
2.5
3
OUTPUT CURRENT(A)
Figure 1:
Efficiency vs. load current for minimum, nominal, and
Figure 2:
Power dissipation vs. load current for minimum,
maximum input voltage at 25
°
C
nominal, and maximum input voltage at 25
°
C
INPUT CURRENT (A)
0.40
Io=3A
Io=1.8A
Io=0.3A
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
30
35
40
45
50
55
60
65
70
75
INPUT VOLTAGE (V)
Figure 3:
Typical input characteristics at room temperature
Figure 4:
Turn-on transient at full rated load current (resistive
load) (10 ms/div). Top Trace: Vin (20V/div); Bottom Trace:
Vout (1V/div).
3
ELECTRICAL CHARACTERISTICS CURVES
Figure 5:
Turn-on transient at zero load current (10 ms/div).
Top Trace: Vin (20V/div) Bottom Trace:Vout (1V/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, 100m
Ω
ESR tantalum capacitor and 1µF
ceramic capacitor. Top Trace: Vout (50mV/div), Bottom
Trace: Iout (2A/div).
Figure 7
:
Test set-up diagram showing measurement points
for Input Reflected Ripple Current (Figure 8).
Note: Measured input reflected-ripple current with a
simulated source Inductance (L
TEST
) of 12
µH.
Capacitor Cs
offset possible battery impedance.
Figure 8:
Input Reflected Ripple Current, is , at full rated
output current and nominal input voltage with 12
µ
H source
impedance and 68
µ
F electrolytic capacitor (2 mA/div).
4
ELECTRICAL CHARACTERISTICS CURVES
Copper Strip
Vo(+)
10u
Vo(-)
1u
SCOPE
RESISTIVE
LOAD
Figure 9:
Output voltage noise and ripple measurement test
setup. 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.
OUTPUT VOLTAGE (V)
Figure 10:
Output voltage ripple at nominal input voltage
and rated load current (50 mV/div). Load capacitance: 1
µ
F
ceramic capacitor and 10
µ
F tantalum capacitor.
Bandwidth: 20 MHz.
3.5
3.0
2.5
2.0
1.5
1.0
0.5
Vin=48V
0.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
LOAD CURRENT (A)
Figure 11:
Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
5
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