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S-8540A18FN-IADT2G Datasheet(PDF) 20 Page - Seiko Instruments Inc |
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S-8540A18FN-IADT2G Datasheet(HTML) 20 Page - Seiko Instruments Inc |
20 / 36 page STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER S-8540/8541 Series Rev.3.2_00 20 Seiko Instruments Inc. Application Circuits 1. External adjustment of output voltage The output voltage can be adjusted or changed in the output voltage setting range (1.5 to 6.0 V) by adding external resistors (RA, RB) and a capacitor (CFB) in the S-8540/8541B00AFN and S- 8540/8541D00AFN, as shown in Figure 15. Temperature gradient can be given by inserting a thermistor in series to RA and RB. L SD R SEN SE Tr VIN CIN SENSE + − VREF=1.0 V 125m V VIN EXT + − + − COUT VSS VOUT CFB RB RA FB PW M, PW M/PFM switching control circuit Shu tdo wn s of t start circuit Error amplifier PWM comparator T riangular wave oscillation cir cuit Phase comp ensation circuit Power for IC Voltage/ current referenc e CVREF V ON/OFF ON/OFF One point ground Figure 15 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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