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TPS60403 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS60403 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 29 page  Start FF R S Q VI – VCFLY+ < 0.5 V VI MEAS VI < 1 V VI VO > Vbe VO MEAS VO OSC OSC CHG 50 kHz VO > –1 V VI / VO MEAS VI VO VCO_CONT VO < –VI – Vbe Phase Generator DC_ Startup C(fly) + Q3 Q2 Q1 Q4 VI VO GND Q5 Q Q B DC_ Startup C(fly) 1 µF S2 S1 S3 S4 CO 1 µF VO (–VI) GND VI GND TPS60400, TPS60401 TPS60402, TPS60403 SLVS324B – JULY 2001 – REVISED APRIL 2015 www.ti.com 8 Detailed Description 8.1 Overview The TPS60400, TPS60401 charge pumps invert the voltage applied to their input. For the highest performance, use low equivalent series resistance (ESR) capacitors (for example, ceramic). During the first half-cycle, switches S2 and S4 open, switches S1 and S3 close, and capacitor (C(fly)) charges to the voltage at VI. During the second half-cycle, S1 and S3 open, S2 and S4 close. This connects the positive terminal of C(fly) to GND and the negative to VO. By connecting C(fly) in parallel, CO is charged negative. The actual voltage at the output is more positive than -VI, since switches S1-S4 have resistance and the load drains charge from CO. Figure 20. Operating Principle 8.2 Functional Block Diagram 10 Submit Documentation Feedback Copyright © 2001–2015, Texas Instruments Incorporated Product Folder Links: TPS60400 TPS60401 TPS60402 TPS60403 |
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