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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4212CMS датащи(PDF) 20 Page - Linear Technology |
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LTC4212CMS датащи(HTML) 20 Page - Linear Technology |
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20 / 24 page  20 LTC4212 4212f OPERATIO by the SLOW COMP’s threshold, VCB(SLOW) = 50mV, and occurs should a load current fault condition exist for more than 18 µs. The current level at which the electronic circuit breaker trips is given by Equation 8: I V R mV R TRIP SLOW CB SLOW SENSE SENSE () () == 50 (8) The second trip point is set by the FAST COMP’s threshold, VCB(FAST) = 150mV, and occurs during fast load current transients that exist for 500ns or longer. The current level at which the circuit breaker trips in this case is given by Equation 9: I V R mV R TRIP FAST CB FAST SENSE SENSE () () == 150 (9) As a design aid, the currents at which electronic circuit breaker trips for common values for RSENSE are shown in Table 4. Table 4. ITRIP(SLOW) and ITRIP(FAST) vs RSENSE RSENSE ITRIP(SLOW) ITRIP(FAST) 0.005 Ω 10A 30A 0.006 Ω 8.3A 25A 0.007 Ω 7.1A 21A 0.008 Ω 6.3A 19A 0.009 Ω 5.6A 17A 0.01 Ω 5A 15A For proper circuit breaker operation, Kelvin-sense PCB connections between the sense resistor and the LTC4212’s VCC and SENSE pins are strongly recommended. The drawing in Figure 7 illustrates the correct way of making connections between the LTC4212 and the sense resistor. PCB layout should be balanced and symmetrical to mini- mize wiring errors. In addition, the PCB layout for the sense resistor should include good thermal management techniques for optimal sense resistor power dissipation. The power rating of the sense resistor should accommo- date steady-state fault current levels so that the compo- nent is not damaged before the circuit breaker trips. Table 5 in the Appendix lists sense resistors that can be used with the LTC4212’s circuit breaker. Calculating Circuit Breaker Trip Current For a selected RSENSE value, the nominal load current that trips the circuit breaker is given by Equation 10: IRC-TT SENSE RESISTOR LR251201R010F OR EQUIVALENT 0.01 Ω, 1%, 1W CURRENT FLOW TO LOAD CURRENT FLOW TO LOAD TO VCC TO SENSE TRACK WIDTH W: 0.03" PER AMP ON 1 OZ COPPER W 4212 F07 Figure 7. Making PCB Connections to the Sense Resistor I V R mV R TRIP NOM CB NOM SENSE NOM SENSE NOM () () () () == 50 (10) The minimum load current that trips the circuit breaker is given by Equation 11. I V R mV R TRIP MIN CB MIN SENSE MAX SENSE MAX () () () () == 40 (11) where RR R SENSE MAX SENSE NOM TOL () ( ) • =+ 1 100 The maximum load current that trips the circuit breaker is given in Equation 12. I V R mV R TRIP MAX CB MAX SENSE MIN SENSE MIN () () () () == 60 (12) where RR R SENSE MIN SENSE NOM TOL () ( ) •– = 1 100 |
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