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SI-8001FDE 数据表(PDF) 3 Page - Sanken electric |
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SI-8001FDE 数据表(HTML) 3 Page - Sanken electric |
3 / 9 page 3 SANKEN ELECTRIC CO., LTD. DC-to-DC Step-Down Converter SI-8001FDE 27469.056 SI-8000FDE (a) VO on/off control only (c) VO on/off and soft start control (b) Soft start only C3 SS 5 SI-8000FDE SS 5 SI-8000FDE SS 5 System TTL C3 System TTL ELECTRICAL CHARACTERISTICS1, valid at TA = 25°C, VO = 5 V (adjusted), R1 = 4.2 kΩ, R1 = 0.8 kΩ Characteristic Symbol Test Conditions1 Min. Typ. Max. Units Reference Voltage VADJ VIN = 15 V, IO = 0.2 A 0.784 0.800 0.816 V Reference Voltage Temperature Coefficient ∆VADJ/∆TVIN = 15 V, IO = 0.2 A, TC = 0 to 100 °C – ±0.1 – mV/°C Efficiency2 η VIN = 15 V, IO = 2 A – 83 – % Operating Frequency fO VIN = 15 V, IO = 2 A 270 300 330 kHz Line Regulation VLine VIN = 10 to 30 V, IO = 2 A – – 80 mV Load Regulation VLoad VIN = 15 V, IO = 0.2 to 3.5 A – – 50 mV Overcurrent Protection Threshold Current IS VIN = 15 V 3.6 – – A SS Terminal On/Off Operation Threshold Voltage VSSL – – 0.5 V SS Terminal On/Off Operation Outflow Current ISSL VSSL = 0 V – 6 30 μA Quiescent Current 1 Iq VIN = 15 V, IO = 0 A – 6 – mA Quiescent Current 2 Iq(off) VIN = 15 V, VSS = 0 V – 200 600 μA 1 Using circuit shown in Typical Application Circuit diagram. 2 Efficiency is calculated as: η(%) = ([VO × IO] × [VIN × IIN]) × 100. Terminal List Table Name Number Function IN 1 Supply voltage SW 2 Regulated supply output GND 3 Ground terminal ADJ 4 Terminal for resistor bridge feedback SS 5 The SS terminal is used to enable soft start and to control on/off operation of the IC output, VO (see figure 2). If neither soft start nor on/off control is used, leave pin open. To enable soft start, connect a capacitor between SS and ground. To control on/off operation, connect an NPN bipolar transistor, in a TTL open collector output configuration, between the SS terminal and GND. Turn off is done by decreasing VSSL below its rated level. When both soft start and VO on/off are used, a protection measure such as current limiting is required because, if the capacitance of C3 large, the discharge current of C3 flows across the transistor for on/off operation. Because a pull-up type resistor is provided inside the IC, no external voltage can be applied. Pin-out Diagram Figure 2. Alternative configurations for SS pin. If neither soft start nor VO on/off is required, the SS pin is left open. 12 3 4 5 |
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