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RT9629BZQW Datasheet(PDF) 4 Page - Richtek Technology Corporation |
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RT9629BZQW Datasheet(HTML) 4 Page - Richtek Technology Corporation |
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4 / 14 page  RT9629B 4 DS9629B-06 July 2015 www.richtek.com © Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Operation POR (Power On Reset) POR block detects the voltage at VCC1 pin and VCC2 pin. When the VCC1 and VCC2 pin voltage is higher than POR rising threshold, POR pin output voltage (POR output) is high. POR output is low when VCC1 and VCC2 are not both higher than POR rising threshold. When the POR pin voltage is high, UGATEx and LGATEx can be controlled by PWMx pin voltage. With low POR pin voltage, both UGATEx and LGATEx will be pulled to low. Tri-State Detect When the POR block output voltage is high, UGATEx and LGATEx can be controlled by PWMx input. There are three PWMx input modes, which are high, low, and shutdown state. If PWMx input is within the shutdown window, both UGATEx and LGATEx output are low. When PWMx input is higher than its rising threshold, UGATEx is high and LGATEx is low. When PWMx input is lower than its falling threshold, UGATEx is low and LGATEx is high. Bootstrap Control Bootstrap control block controls the integrated bootstrap switch. When LGATEx is high (low side MOSFET is turned on), the bootstrap switch is turned on to charge the bootstrap capacitor connected to BOOTx pin. When LGATEx is low (low side MOSFET is turned off), the bootstrap switch is turned off to disconnect VCCx pin and BOOTx pin. Turn-Off Detection Turn-off detection block detects whether high side MOSFET is turned off by monitoring PHASEx pin voltage. To avoid shoot through between high side and low side MOSFETs, low side MOSFET can be turned on only after high side MOSFET is effectively turned off. Shoot-Through Protection : Shoot-through protection block implements the dead time when both high side and low side MOSFETs are turned off. With shoot-through protection block, high side and low side MOSFET are never turned on simultaneously. Thus, shoot through between high side and low side MOSFETs is prevented. |
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