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S8540 Datasheet(PDF) 2 Page - Seiko Instruments Inc |
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S8540 Datasheet(HTML) 2 Page - Seiko Instruments Inc |
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2 / 36 page  STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER S-8540/8541 Series Rev.4.0_01 2 Block Diagrams 1. A, C types (fixed output voltage) VSS VOUT SD PWM or PWM / PFM switching control circuit Phase compensation circuit Triangular wave oscillation circuit VIN L EXT Voltage/current reference Shutdown soft start circuit VIN Pch Power MOS FET Power for IC RSENSE SENSE PWM comparator Error amplifier CIN COUT VREF =1.0 V 125 mV CVREF CVL ON/OFF VON/OFF CSS RSS Figure 1 2. B, D types (feed back) VSS VOUT SD Phase compensation circuit Triangular wave oscillation circuit VIN L EXT Voltage/current reference Shutdown soft start circuit VIN Pch Power MOS FET Power for IC RSENSE SENSE PWM comparator Error amplifier FB CFB RB CIN COUT VREF =1.0 V 125 mV CVREF CVL ON/OFF VON/OFF CSS RSS VOUT RA PWM or PWM / PFM switching control circuit Figure 2 |
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