FEATURES
High efficiency: 85.5% @ 1.2V/ 12A
Size: 47.2mm x 29.5mm x 8.5mm
(1.86" x 1.16" x 0.33")
Low profile: 0.33"
Industry standard footprint and pin out
Surface mountable
Fixed frequency operation
Input UVLO, Output OCP, OVP, OTP
No minimum load required
2:1 input voltage range
Basic insulation
2250 isolation
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing
facility
UL/cUL 60950 (US & Canada) recognized,
and TUV (EN60950) certified
Delphi Series S24SA, 2”x1” Family
DC/DC Power Modules: 18~36Vin, 1.2V, 12A out
The Delphi Series S24SA, surface mountable, 24V 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 36 watts of power or up to 12A of
output current (for output voltage 1.8V or below) in a low profile 2”x1”
industry standard form factor and pinout. The S24SA operates from a
wide input range of 18V to 36V, output ranges from 1.2V to 12V. For 1.2V
at 12A full load, the efficiency is up to 85.5%. With creative design
technology and optimization of component placement, these 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, and feature 2250V input/output isolation and basic insulation.
OPTIONS
Positive on/off logic
SMD or Through hole mounting
APPLICATIONS
Telecom/DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Test Equipment
DATASHEET
DS_S24SA1R212_05102006
Delta Electronics, Inc.
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=200 LFM, V
in
=24Vdc, nominal Vout unless otherwise noted.)
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Operating 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
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 to 1% of Final value
Turn-On Transient
Start-Up Time, From On/Off Control
Start-Up Time, From Input
Maximum Output Capacitance
EFFICIENCY
100% Load
ISOLATION CHARACTERISTICS
Isolation Voltage
Isolation Resistance
Isolation Capacitance
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control, (Logic Low-Module ON)
Logic Low
Logic High
ON/OFF Current
Leakage Current
Output Voltage Trim Range
Output Over-Voltage Protection(Hiccup)
GENERAL SPECIFICATIONS
Calculated MTBF
Weight
Over-Temperature Shutdown
NOTES and CONDITIONS
Min.
-0.3
-40
-55
18
13
1
100% Load, 18Vin
S24SA1R212NRFA
Typ.
Max.
Units
50
110
125
2250
24
17
15
2
40
7
0.01
5
50
1.17
1.20
±2
±2
100
1.15
20
5
0
13.2
30
30
200
1.23
±10
±5
300
1.25
50
15
12
18
75
75
12
12
2200
85.5
2250
10
1500
330
36
18
3
2.2
Vdc
°C
°C
Vdc
V
V
V
V
A
mA
mA
A
2
s
mA
dB
V
mV
mV
ppm/℃
V
mV
mV
A
A
mV
mV
µs
ms
ms
µF
%
V
MΩ
pF
kHz
0.8
15
1
50
+10
160
6.2
18
115
V
V
mA
uA
%
%
Mhours
grams
°C
Please refer to Fig. 18 For measuring point
P-P thru 12µH inductor, 5Hz to 20MHz
120 Hz
Vin=24V, Io=50%Io.max, Ta=25℃
Io=Io,min to Io,max
Vin=18V to36V
Ta=-40℃ to 85℃
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
24V, 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
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
Across Trim Pin & +Vo or –Vo, Pout≦max rated
Over full temp range; % of nominal Vout
Io=80% of Io, max; Ta=25°C, Airflow=200LFM
Please refer to Fig.18 For measuring point
0
-10
115
2
DS_S24SA1R212_05102006
ELECTRICAL CHARACTERISTICS CURVES
POWER DISSIPATION (W)
EFFICIENCY (%)
95
90
85
80
75
70
65
60
55
50
45
40
1
2
3
4
5
6
7
8
9
10 11 12
18Vin
24Vin
36Vin
4.0
3.5
3.0
2.5
2.0
1.5
1.0
18Vin
0.5
0.0
1
2
3
4
5
6
7
8
9
24Vin
36Vin
10 11 12
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Figure 1:
Efficiency vs. load current for minimum, nominal, and
maximum input voltage at 25
°
C.
INPUT CURRENT (A)
Figure 2:
Power dissipation vs. load current for minimum,
nominal, and maximum input voltage at 25
°
C.
1.2
Io=12A
1.0
0.8
0.6
0.4
0.2
0.0
15
20
25
Io=7.2A
Io=1.2A
30
35
INPUT VOLT AGE (V)
Figure 3:
Typical input characteristics at room temperature.
Figure 4:
Turn-on transient at full rated load current (1 ms/div).
Top Trace: Vout (500mV/div); Bottom Trace: ON/OFF Control
(5V/div).
3
DS_S24SA1R212_05102006
ELECTRICAL CHARACTERISTICS CURVES
Figure5
:
Turn-on transient at zero load current (1 ms/div). Top
Trace: Vout (500mV/div); Bottom Trace: ON/OFF Control
(5V/div).
Figure 6:
Output voltage response to step-change in load
current (50%-75% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF,
100 m
Ω
ESR tantalum capacitor and 1µF ceramic capacitor.
Top Trace: Vout (50mV/div), Bottom Trace: Iout (5A/div).
i
s
Vi (+)
Cs : 220uF
ESR < 0.1
Ω
@20
℃
100KHZ
Cs :100uF
ESR < 0.5
Ω
@20
℃
100KHZ
Vi (-)
Figure 7
:
Output voltage response to step-change in load
current (75%-50% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF, 100 m
Ω
ESR tantalum capacitor and 1µF ceramic
capacitor.
Top Trace: Vout (50mV/div), Bottom Trace: Iout
5A/div).
Figure 8:
Test set-up diagram showing measurement points
for Input Reflected Ripple Current (Figure 9).
Note: Measured input reflected-ripple current with a simulated
source Inductance (L
TEST
) of 12
µH.
Capacitor Cs offset
possible battery impedance.
4
DS_S24SA1R212_05102006
ELECTRICAL CHARACTERISTICS CURVES
Copper Strip
Vo(+)
10u
Vo(-)
1u
SCOPE
RESISTIVE
LOAD
Figure 9
:
Input Reflected Ripple Current, is, at full rated output
current and nominal input voltage with 12
µ
H source impedance
and 100
µ
F electrolytic capacitor (2 mA/div).
Figure 10:
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)
1.4
1.2
1.0
0.8
0.6
0.4
Vin=24V
0.2
0.0
0.0
2.0
4.0
6.0
8.0
10.0 12.0
14.0 16.0
LOAD CURRENT (A)
Figure 11:
Output voltage ripple at nominal input voltage and
rated load current (10 mV/div). Load capacitance: 1
µ
F ceramic
capacitor and 10
µ
F tantalum capacitor. Bandwidth: 20 MHz.
Figure 12:
Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
5
DS_S24SA1R212_05102006
