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VCTA25201B-R33MS6 数据表(PDF) 9 Page - Richtek Technology Corporation |
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VCTA25201B-R33MS6 数据表(HTML) 9 Page - Richtek Technology Corporation |
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9 / 50 page  RTQ2134-QA Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DSQ2134-QA-02 May 2022 www.richtek.com 9 BOOT HOT Die OT OV UV PG Rising Falling BOOT Event Flag HOT Die Event Flag OT Event Flag OV Event Flag UV Event Flag PG Event Flag BOOT Mask HOT Die Mask OT Mask OV Mask UV Mask PG Mask To INT Rising Falling Rising Falling Rising Falling Rising Falling Rising Falling Figure 7. Overall Detection Function Watchdog Function The RTQ2134 implements a watchdog function which resets each Buck output voltage, DVSx, and ENDVSx registers to factory default setting value. Register 0x25 can enable or disable watchdog function of each Buck and provide the debounce time for selection. The minimum watchdog debounce time is 100 s when 0x25[2:0] is set to 000. The operation of watchdog reset is shown in Figure 8. Table 1 shows the registers will be reset when WDOG_RST pin is pulled low. The I2C command needs to be after the WDOG_RST is pulled high. VOUT of BUCKx WDOG_RST Default Voltage Lower VSET DVS Slew Rate DEBOUNCE Time Register Setting Higher VSET Reset Related Register Figure 8. Watchdog Reset Operation Table 1. Watchdog Reset Register BUCK1_WDT BUCK2_WDT BUCK3_WDT 0x48 0x62 0x7C 0x49[0] 0x63[0] 0x7D[0] 0x4A 0x64 0x7E 0x4B[0] 0x65[0] 0x7F[0] 0x52 0x6C 0x86 Over-Current Protection The RTQ2134 features cycle-by-cycle current-limit protection on both HSFET and LSFET to prevent the device from the catastrophic damage in output short-circuit, over-current or inductor saturation conditions. The HSFET over-current protection is achieved by an internal current comparator that monitors the current in the HSFET during each on-time. The switch current is compared with the HSFET peak-current limit (ILIM_H) after a certain amount of delay when the HSFET is turned on each cycle. If an over-current condition occurs, the converter will immediately turn off the HSFET and turn on the LSFET to prevent the inductor current from exceeding the HSFET current limit. The LSFET over-current protection is achieved by measuring the inductor current through the LSFET |
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