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S8540 Datasheet(PDF) 18 Page - Seiko Instruments Inc |
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S8540 Datasheet(HTML) 18 Page - Seiko Instruments Inc |
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18 / 36 page  STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER S-8540/8541 Series Rev.4.0_01 18 Standard Circuits 1. Fixed output voltage (Pch MOS FET) + − − + − + L SD RSENSE Tr VIN CIN SENSE VREF =1.0 V PWM, PWM/PFM switching control circuit Shutdown soft start circuit 125mV Error amplifier PWM comparator Triangular wave oscillation circuit Phase compensation circuit Power for IC VIN EXT COUT VSS VOUT CVREF VON/OFF ON/OFF One point ground Voltage/current reference Figure 13 2. Feed back type (Pch MOS FET) L SD RSENSE Tr VIN CIN SENSE + − VREF=1.0 V 125mV VIN EXT + − + − COUT VSS VOUT CFB RB RA FB PWM, PWM/PFM switching control circuit Shutdown soft start circuit Error amplifier PWM comparator Triangular wave oscillation circuit Phase compensation circuit Power for IC Voltage/current reference CVREF VON/OFF ON/OFF One point ground Figure 14 Caution The above connection diagram and constant will not guarantees successful operation. Perform through evaluation using the actual application to set the constant. |
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