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S-8521 Datasheet(PDF) 3 Page - Seiko Instruments Inc |
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S-8521 Datasheet(HTML) 3 Page - Seiko Instruments Inc |
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3 / 44 page  STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.9.0_01 S-8520/8521 Series 3 Block Diagrams 1. S-8520 Series VOUT VSS L SD COUT VON/OFF ______ + VIN Tr EXT VIN CIN + Oscillation circuit PWM control circuit Reference voltage source with soft-start − + ON/OFF ______ Remark All the diodes in the figure are parasitic diodes. Figure 1 2. S-8521 Series VOUT VSS L SD COUT + VIN Tr EXT VIN CIN + − + VON/OFF ______ ON/OFF ______ Oscillation circuit PWM / PFM switching control circuit Reference voltage source with soft-start Remark All the diodes in the figure are parasitic diodes. Figure 2 |
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