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RT8511B Datasheet(PDF) 8 Page - Richtek Technology Corporation |
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RT8511B Datasheet(HTML) 8 Page - Richtek Technology Corporation |
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8 / 11 page  RT8511B 8 DS8511B-05 February 2015 www.richtek.com © Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Mode2 Mode3 Figure 4. Power On Sequence Mode1 Mode2 Mode3 Figure 5. Power Off Sequence VIN VOUT soft-start EN VIN VOUT EN PWM soft-start VIN VOUT EN PWM VIN VOUT EN PWM VIN VOUT EN PWM Shutdown Delay Mode1 VIN VOUT soft-start EN PWM Soft-Start The RT8511B provides a built-in soft-start function to limit the inrush current, while allowing for an increased PWM frequency for dimming. Current Limiting Protection The RT8511B can limit the peak current to achieve over current protection. The IC senses the inductor current through the LX pin in the charging period. When the value exceeds the current limiting threshold, the internal N- MOSFET will be turned off. In the off period, the inductor current will descend. The internal MOSFET is turned on by the oscillator during the beginning of the next cycle. Power Sequence In order to assure that the normal soft-start function is in place for suppressing the inrush current, the input voltage and enable voltage should be ready before PWM pulls high. Figure 4 and Figure 5 show the power on and power off sequences. |
Similar Part No. - RT8511B |
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Similar Description - RT8511B |
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