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S8550 Datasheet(PDF) 2 Page - Seiko Instruments Inc |
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S8550 Datasheet(HTML) 2 Page - Seiko Instruments Inc |
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2 / 31 page  STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS S-8550 Series Rev.5.0_01 2 Block Diagram 1. SOT-23-5 L ON/OFF VIN + − + − CIN FB VIN CONT VSS CFB RFB1 RFB2 VOUT COUT *1 *1 Reference voltage PWM comparator PWM control circuit UVLO circuit ON/OFF circuit IC internal power supply Current limit circuit Error amplifier Triangular wave generation circuit *1. Parasitic diode Figure 1 2. SNT-8A L ON/OFF VIN + − + − CIN FB VIN CONT PVSS CFB RFB1 RFB2 VOUT COUT *1 *1 Reference voltage PWM comparator PWM control circuit UVLO circuit ON/OFF circuit IC internal power supply Current limit circuit Error amplifier Triangular wave generation circuit VSS *1. Parasitic diode Figure 2 |
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