Delta Electronics S24SA User Manual

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FEATURES

 High efficiency: 87.5% @ 1.8V/ 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, 1.8V, 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 12

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 1.8

at 12A full load, the efficiency is up to 87.5%. 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.

models are protected from abnormal input/output voltage and curren

conditions, and feature 2250V input/output isolation and basic insulation.

OPTIONS

 Positive on/off logic

 SMD or Through hole mounting

ll

APPLICATIONS

 Telecom/DataCom

 Wireless Networks

 Optical Network Equipment
 Server and Data Storage

 Industrial/Test Equipment

DATASHEET
DS

S24SA1R812_05092006

Delta Electronics, Inc.

TECHNICAL SPECIFICATIONS

A

pp

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(TA=25°C, airflow rate=200 LFM, Vin=24Vdc, nominal Vout unless otherwise noted.)

PARAMETER

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Continuous
Operating Temperature Please refer to Fig. 18 For measuring point -40 110 °C
Storage Temperature
Input/Output Isolation Voltage 2250 Vdc

INPUT CHARACTERISTICS

Operating Input Voltage
Input Under-Voltage Lockout

Turn-On Voltage Threshold

Turn-Off Voltage Threshold

Lockout Hysteresis Voltage

Maximum Input Current 100% Load, 18Vin 2.2 A
No-Load Input Current 50 mA
Off Converter Input Current 7
Inrush Current(I2t) 0.01 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 5 mA
Input Voltage Ripple Rejection 120 Hz 50 dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point
Output Voltage Regulation

Over Load Io=Io,min to Io,max ±2 ±10 mV

Over Line Vin=18V to36V ±2 ±5 mV

Over Temperature

Total Output Voltage Range Over sample load, line and temperature 1.73 1.87 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 20 50 mV

RMS Full Load, 1µF ceramic, 10µF tantalum 5 15 mV

Operating Output Current Range 0 12 A
Output DC Current-Limit Inception Output Voltage 10% Low 13.2 18 A

DYNAMIC CHARACTERISTICS

Output Voltage Current Transient 24V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs

Positive Step Change in Output Current 50% Io,max to 75% Io,max 30 75 mV

Negative Step Change in Output Current 75% Io,max to 50% Io.max 30 75 mV

Settling Time to 1% of Final value 200 µs

Turn-On Transient

Start-Up Time, From On/Off Control 12 ms

Start-Up Time, From Input 12

Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 2200 µF

EFFICIENCY

100% Load

ISOLATION CHARACTERISTICS

Isolation Voltage 2250 V
Isolation Resistance 10 MΩ
Isolation Capacitance 1500 pF

FEATURE CHARACTERISTICS

Switching Frequency 330 kHz
ON/OFF Control, (Logic Low-Module ON)

Logic Low Von/off at Ion/off=1.0mA 0 0.8 V

Logic High Von/off at Ion/off=0.0 µA 15 V

ON/OFF Current Ion/off at Von/off=0.0V 1 mA

Leakage Current Logic High, Von/off=15V 50 u
Output Voltage Trim Range
Output Over-Voltage Protection(Hiccup) Over full temp range; % of nominal Vout 115 160 %

GENERAL SPECIFICATIONS

Calculated MTBF Io=80% of Io, max; Ta=25°C, Airflow=200LFM 5.7 M hours
Weight 18 grams
Over-Temperature Shutdown Please refer to Fig.18 For measuring point 115 °C

87.5 %

NOTES and CONDITIONS S24SA1R812NRFA

Min. Typ. Max. Units Units

Vin=24V, Io=50%Io.max, Ta=25℃

Ta=-40℃ to 85℃

cross Trim Pin & +Vo or –Vo, Pout≦max rated

-0.3 50 Vdc

-55 125 °C

18 24 36 V

17 18 V

13 15 V

1 2 3 V

1.77 1.80 1.83

100 300

-10 +10 %

m

V

m/℃

ms

DS_S24SA1R812_05092006

2

ELECTRICAL CHARACTERISTICS CURVES

95

90

85

EFFICIENCY (%)

80

75

70

65

60

55

50

18Vin 24Vin 36Vin

0.1 2 4 6 8 10 12

OUTPUT CURRENT (A)

POWER DISSIPATION (W)

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

18Vin 24Vin 36Vin

0.1 2 4 6 8 10 12

OUT PUT CURRENT (A)

Figure 1: Efficiency vs. load current for minimum, nominal, and

maximum input voltage at 25

°C.

1.60

1.40

INPUT CURRENT (A)

1.20

1.00

0.80

0.60

0.40

0.20

0.00
15 20 25 30 35

Io= 12A Io= 7.2A Io= 1.2A

INPUT VOLTAGE (V)

Figure 2: Power dissipation vs. load current for minimum,

nominal, and maximum input voltage at 25

°C.

Figure 3: Typical input characteristics at room temperature. Figure 4: Turn-on transient at full rated load current (2 ms/div).

Top Trace: Vout (1V/div); Bottom Trace: ON/OFF Control
(5V/div).

DS_S24SA1R812_05092006

3

ELECTRICAL CHARACTERISTICS CURVES



)

Figure5: Turn-on transient at zero load current (2 ms/div). Top

Trace: Vout (1mV/div); Bottom Trace: ON/OFF Control
(5V/div).

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
capacitor. Top Trace: Vout (50mV/div), Bottom Trace: Iout
5A/div).

Ω

ESR tantalum capacitor and 1µF ceramic

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 Cs :100uF
ESR < 0.1 ESR < 0.5
@20 100KHZ℃

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
possible battery impedance.

Ω Ω

@20 100KHZ

℃

of 12 µH. Capacitor Cs offset

TEST

Vi (-)

DS_S24SA1R812_05092006

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