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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4221IGN датащи(PDF) 18 Page - Linear Technology |
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LTC4221IGN датащи(HTML) 18 Page - Linear Technology |
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18 / 28 page  18 LTC4221 4221f The LTC4221 can also be configured to automatically retry after a fault condition. As shown in Figure 10, the FAULT (which has an internal 3.8µA pull-up current source) and both ON pins are connected together. The timing diagram in Figure 11 illustrates a simultaneous start-up sequence where the LTC4221 is powered up into a load overcurrent condition on channel 1. After the slow comparators are armed at the end of the start-up cycle at time point 4, slow comparator 1 immediately trips and FILTER ramps up. FILTER ramps past its high threshold at time point 6 and trips the circuit breaker. FAULT and both ON pins are pulled low by an internal N-channel MOSFET and over- shoots below the 0.4V reset threshold of the ON1 pin. Once ON1 < 0.4V for more than 15µs, the internal fault APPLICATIO S I FOR ATIO + VCC1 ON1 SENSE1 ON2 FAULT RF2 15k LTC4221* GATE1 FB1 4221 F10 1 16 7 10 9 CTIMER 1µF GND TIMER RF1 56k VOUT1 3.3V 5A VOUT2 2.5V 5A Q1 IRF7413 RSENSE1 0.004Ω CLOAD1 8 CFILTER 1nF FILTER Z1 Q2: 2N7002LT1 Z1: SMAJ10 * ADDITIONAL DETAILS OMITTED FOR CLARITY RX1 10Ω CX1 100nF CON1 0.47µF R1 1M LONG VCC1 LONG PCB EDGE CONNECTOR (MALE) SHORT BACKPLANE CONNECTOR (FEMALE) LONG VCC2 FAULT Figure 10. Using FAULT to Configure Autoretry 2 13 4 5 6 7 8 9 20µA ELECTRONIC CIRCUIT BREAKER ARMED 20µA2µA 1.8µA 0.4V 0.4V 0.851V VFILTER(TH) VSENSE(FC) VSENSE(SC) 9.5µA 105µA 1.9µA VTMR(L) VTMR(H) 0.851V TIMER ON n, FAULT FILTER GATE1 SENSE1 VOUT1 RESET CHANNEL START-UP FILTER RAMP RESET tON tINITIAL OFF INITIAL TIMING 4221 F11 INITIAL TIMING tINITIAL tSTARTUP tFILTER SLOW COMPARATORS ARMED Figure 11. Autoretry Timing Waveforms |
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