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IR36021 датащи(PDF) 18 Page - International Rectifier |
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IR36021 датащи(HTML) 18 Page - International Rectifier |
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18 / 41 page ![]() IR36021 DIGITAL POL BUCK CONTROLLER with I2C AND PMBus Interface February 27, 2013 | Rev 3.5 18 TABLE 2: SLEW RATES mV/µs Fast Rate ½ Multiplier ¼ Multiplier 10 1 5.0 0.5 2.50 0.25 15 1.5 7.5 0.75 3.75 0.375 20 2 10 1 5.00 0.5 25 2.5 12.5 1.25 6.25 0.625 It should be noted that shutting down with Enable is always a soft shutdown meaning that Vout is ramped down to 0V (Figure 14). On the other hand, shutdown due to input under‐voltage or most of the faults is a hard shutdown meaning that both high side and low side FETs are turned off (Figure 15). TABLE 3: OPTIONS FOR STARTUP SEQUENCING DELAY (COMMON EN) Delay [ms] 0 0.25 0.5 1 2.5 5 10 Figure 12: Enable‐based Startup, loop1 follows loop2 with a delay of 2.5ms from PGood2 rising edge. Figure 13: Enable‐based startup, both loops start with a delay of 2.5ms from EN1 going high. Figure 14: Enable based shutdown, both loops configured to follow EN1. Vout1 and Vout2 are ramped down to 0V. Figure 15: Vin based shutdown, the high side and low side FETs are turned off as soon as Vin falls below UVLO threshold. |
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