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ADP1048-600-EVALZ Datasheet(PDF) 16 Page - Analog Devices |
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ADP1048-600-EVALZ Datasheet(HTML) 16 Page - Analog Devices |
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16 / 84 page  ADP1047/ADP1048 Data Sheet Rev. 0 | Page 16 of 84 Figure 12 shows an example of the output voltage and the OVP thresholds set. The rising and falling thresholds, FAST_OVP_ FAULT_RISE and FAST_OVP_FAULT_FALL, respectively, are used for fast OVP protection. FAST_OVP_FAULT_RISE corresponds to OVPUP, which is the trip point for overvoltage protection (see Figure 13). FAST_OVP_FAULT_FALL corre- sponds to OVPDOWN, which is the reset point for the fast OVP. When the rising threshold is triggered, the programmed action is applied and the threshold is switched to the programmed fall- ing threshold (if the programmed falling threshold is different from the rising threshold). A blanking time is applied when the thresholds are switched to avoid spurious signals (see the timing diagram in Figure 13). A programmable debounce time is applied to the OVP signal as well to avoid false triggering. The rising and falling thresholds are programmable from 1 V to 1.5 V (at the OVP pin) using Register 0xFE2F and Register 0xFE30, respectively. Open-Loop Protection Open-loop protection detects differences between the OVP and VFB pins. Identical resistor dividers are applied to these pins; therefore, if a voltage difference is present, it means that one or more resistors in the dividers have the wrong values or are not connected. In this case, it is usually recommended that the user shut down the system to prevent damage. The open-loop protection detects a difference in voltage in excess of ~100 mV, which equates to approximately 6.6% of the full-scale range. A debounce time of 10 μs is added to avoid false triggering. If filtering capacitors are applied to the OVP and VFB pins, care must be taken to make sure that the time constant difference does not exceed 10 μs. ADC INPUT RANGE = 1.6V VOUT_OV_FAULT_LIMIT = 450V (REG 0x40) FAST OVP PROGRAMMING RANGE 1.6V 0.5V 1.0V VOUT_COMMAND = 385V (REG 0x21) VOUT_UV_FAULT_LIMIT = 200V (REG 0x44) VOUT_OV_WARN_LIMIT = 420V (REG 0x42) ADC FULL RANGE FAST_OVP_FAULT_RISE = 435V (REG 0xFE2F) FAST_OVP_FAULT_FALL = 400V (REG 0xFE30) Figure 12. Output Voltage Levels OVPUP OVPDOWN OUTPUT VOLTAGE OVP PIN OVPFLAG DEBOUNCE TIME 10µs Figure 13. OVP Thresholds and Timing Table 7. Programmable Options for Open-Loop Protection (OLP) Parameter Values or Options Comments Debounce Time 10 μs (fixed) Minimum duration of pulse to be considered Propagation Delay 200 ns (fixed) Does not include debounce Actions for OLP Immediate shutdown and wait for PSON; disable PWM until the flag is cleared; shut down and soft start; ignore (do nothing) Register 0xFE02, Bits[7:6] |
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Similar Description - ADP1048-600-EVALZ |
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