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S-8521E35MC-BLUT2x Datasheet(PDF) 21 Page - Seiko Instruments Inc |
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S-8521E35MC-BLUT2x Datasheet(HTML) 21 Page - Seiko Instruments Inc |
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21 / 44 page  STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.9.0_01 S-8520/8521 Series 21 Standard Circuits 1. Using a bipolar transistor VSS VOUT + VIN CIN L SD COUT Reference voltage source with soft start VIN Tr Cb Rb EXT + + − PWM control or PWM / PFM switching control circuit Oscillation circuit VON/OFF ______ ON/OFF ______ Figure 12 2. Using a Pch MOS FET transistor VSS VOUT L SD COUT + + − VIN Tr + EXT VIN CIN Oscillation circuit Reference voltage source with soft start PWM control or PWM / PFM switching control circuit VON/OFF ______ ON/OFF ______ Figure 13 Caution The above connection diagram and constant will not guarantee successful operation. Perform through evaluation using the actual application to set the constant. |
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