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LTC4210-2IS6 Datasheet(PDF) 9 Page - Linear Technology |
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LTC4210-2IS6 Datasheet(HTML) 9 Page - Linear Technology |
9 / 20 page 9 LTC4210-1/LTC4210-2 421012f SENSE RESISTOR CURRENT FLOW TO LOAD TRACK WIDTH W: 0.03" PER AMP ON 1 OZ COPPER W TO VCC TO SENSE 4210 F01 CURRENT FLOW TO LOAD Figure 1. Making PCB Connections to the Sense Resistor APPLICATIO S I FOR ATIO Current Limit Circuit Breaker Function The LTC4210 features a current limiting circuit breaker instead of a traditional comparator circuit breaker. When there is a sudden load current surge, such as a low impedance fault, the bus supply voltage can drop signifi- cantly to a point where the power to an adjacent card is affected, causing system malfunctions. The LTC4210 fast response error amplifier (EA) instantly limits current by reducing the external MOSFET GATE pin voltage. This minimizes the bus supply voltage drop and permits power budgeting and fault isolation without affecting neighbor- ing cards. A compensation circuit should be connected to the GATE pin for current limit loop stability. Sense Resistor Consideration The nominal fault current limit is determined by a sense resistor connected between VCC and the SENSE pin as given by Equation 1. I V R mV R LIMIT NOM CB NOM SENSE NOM SENSE NOM () () () () == 50 (1) The power rating of the sense resistor should be rated at the fault current level. Table 2 in the Appendix lists some common sense resistors. For proper circuit breaker operation, Kelvin-sense PCB connections between the sense resistor and the LTC4210 VCC and SENSE pins are strongly recommended. The drawing in Figure 1 illustrates the connections between the LTC4210 and the sense resistor. PCB layout should be balanced and symmetrical to minimize wiring errors. In addition, the PCB layout for the sense resistor should include good thermal management techniques for optimal sense resistor power dissipation. Calculating Current Limit For a selected RSENSE, the nominal load current is given by Equation 1. The minimum load current is given by Equation 2: I V R mV R LIMIT MIN CB MIN SENSE MAX SENSE MAX () () () () == 44 (2) where RR R SENSE MAX SENSE TOL () • =+ 1 100 The maximum load current is given by Equation 3: I V R mV R LIMIT MAX CB MAX SENSE MIN SENSE MIN () () () () == 56 (3) where RR R SENSE MIN SENSE TOL () •– = 1 100 |
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