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S-8540 Datasheet(PDF) 2 Page - Seiko Instruments Inc |
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S-8540 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.3.2_00 2 Seiko Instruments Inc. Block Diagrams 1. A, C types (fixed output voltage) VSS VO UT SD PWM or PWM / PFM switch ing Phase com pen satio n circuit Triangu lar wave oscillation circu it VIN L EXT Vo ltage/c urrent ref eren ce Sh ut do wn sof t start circuit VIN Pch Pow er MO S FET Po we r f or IC R SENS E SENSE PWM comp arato r Erro r a mplif ier CIN COUT VREF=1.0 V 125 mV CVREF CVL ON/OFF V ON/ OFF CSS RSS Figure 1 2. B, D types (feed back) VSS VOUT SD PWM o r PWM / PF M swit chin g Phase com pen satio n circuit Trian gula r wave oscill ation circu it VI N L EXT Voltag e/current reference Sh ut down sof t start circ uit VIN Pch Pow er MO S FET Po wer f or IC R SENSE SENSE PWM com parato Error amp lifier FB C FB RB CIN COUT VREF=1.0 V 125 mV CVREF CVL ON/OFF V ON/ OFF CSS RSS V OUT RA Figure 2 |
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