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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
De
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TECHNICAL SPECIFICATIONS (T =25°C, airflow rate=200 LFM, V =24Vdc, nominal Vout unless otherwise noted.) A in PARAMETER NOTES and CONDITIONS S24SA1R812NRFA Min. Typ. Max. Uni Unit ts s ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous -0.3 50 Vdc Operating Temperature Please refer to Fig. 18 For measuring point -40 110 °C Storage Temperature -55 125 °C Input/Output Isolation Voltage 2250 Vdc INPUT CHARACTERISTICS Operating Input Voltage 18 24 36 V Input
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ELECTRICAL CHARACTERISTICS CURVES 5.0 95 18Vin 24Vin 36Vin 18Vin 24Vin 36Vin 4.5 90 4.0 85 3.5 80 3.0 75 2.5 70 2.0 65 1.5 60 1.0 55 0.5 50 0.0 0.1 2 4 6 8 10 12 0.1 2 4 6 8 10 12 OUTPUT CURRENT(A) 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. 1.60 Io=12A Io=7.2A Io=1.2A 1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00 15 20 2
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ELECTRICAL CHARACTERISTICS CURVES Figure5: Turn-on transient at zero load current (2 ms/div). Top Figure 6: Output voltage response to step-change in load Trace: Vout (1mV/div); Bottom Trace: ON/OFF Control current (50%-75% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF, (5V/div). 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 Ω ESR < 0.5 Ω @20 ℃ 100KHZ @20 ℃ 100KHZ Vi (-)
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ELECTRICAL CHARACTERISTICS CURVES Copper Strip Vo(+) SCOPE RESISTIVE 10u 1u LOAD Vo(-) Figure 10: Output voltage noise and ripple measurement test Figure 9: Input Reflected Ripple Current, i , at full rated output s setup. Scope measurement should be made using a BNC current and nominal input voltage with 12µH source impedance cable (length shorter than 20 inches). Position the load and 100µF electrolytic capacitor (2 mA/div). between 51 mm to 76 mm (2 inches to 3 inches) from
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DESIGN CONSIDERATIONS This power module is not internally fused. To achieve Input Source Impedance optimum safety and system protection, an input line fuse is highly recommended. The safety agencies The impedance of the input source connecting to the require a normal-blow fuse with 5A maximum rating to DC/DC power modules will interact with the modules be installed in the ungrounded lead. A lower rated fuse and affect the stability. A low ac-impedance input can be used based on
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FEATURES DESCRIPTIONS Vi(+) Vo(+) Over-Current Protection Sense(+) The modules include an internal output over-current ON/OFF protection circuit, which will endure current limiting for Sense(-) an unlimited duration during output overload. If the output current exceeds the OCP set point, the modules Vi(-) Vo(-) will automatically shut down (hiccup mode). The modules will try to restart after shutdown. If the Figure 13: Remote on/off implementation overload condition still exis
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23.8(100 + ∆Vo%) −1089 FEATURES DESCRIPTIONS (CON.) Rtrim − up = −104[] ΚΩ ∆Vo% Output Voltage Adjustment (TRIM) Ex. When trim-up +10% (1.8V X 1.1 = 1.98V) To increase or decrease the output voltage set point, the modules may be connected with an external resistor 23.8(100 +10) −1089 Rtrim − up = −104 = 48.9 [ ΚΩ ] between the TRIM pin and either the Vo+ or Vo -. The 10 TRIM pin should be left open if this feature is not used. Care should be taken to ensure that the maximu
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THERMAL CURVES THERMAL CONSIDERATIONS Thermal management is an important part of the system design. To ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire temperature range of the module. Convection cooling is usually the dominant mode of heat transfer. Hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel. Thermal Testing Setup Delta’s DC/DC power modules are characterized
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PICK AND PLACE LOCATION SURFACE-MOUNT TAPE & REEL RECOMMENDED PAD LAYOUT (SMD) 10 DS_S24SA1R812_05092006
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LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE Peak temp. 2nd Ramp-up temp. 210~230 °C 5sec. 1.0~3.0 °C /sec. 250 Pre-heat temp. 140~180 °C 60~120 sec. 200 Cooling down rate <3 °C /sec. Ramp-up temp. 150 0.5~3.0 °C /sec. 100 Over 200 °C 40~50sec. 50 0 1 60 20 180 240 300 Time ( sec. ) Note: The temperature refers to the pin of S24SA, measured on the pin +Vout joint. LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE Temp. Peak Temp. 240 ~ 245 ℃ 217 ℃ Ramp
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MECHANICAL DRAWING Surface-mount module Through-hole module Pin No. Name Function 1 +Vout Positive output voltage 2 -Vout Negative output voltage 6 Trim Output voltage trim 8 ON/OFF ON/OFF logic 11 -Vin Negative input voltage 12 +Vin Positive input voltage Optional Pin Name Function 4 +Sense (Option) Positive sense pin 5 -Sense (Option) Negative sense pin 12 DS_S24SA1R812_05092006
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PART NUMBERING SYSTEM S 24 S A 1R8 12 N R F A Form Input Number of Product Output Output ON/OFF Pin Type Option Factor Voltage Outputs Series Voltage Current Logic Code S- Small 24V S- Single A- Advanced 1R2-1.2V 03- 3.0A N- Negative R- SMD A －6 pins, no F- RoHS 6/6 Power 1R5-1.5V 06- 6.6A P- Positive T- Through sense (Lead Free) 1R8-1.8V 10- 10A hole B －8 pins, with 2R5-2.5V 12- 12A sense 3R3- 3.3V 050- 5.0V 120- 12.0V MODEL LIST MODEL NAME INPUT OUTPUT EFF @ 100% LOAD S24SA1R2
