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LTC4224IDDB-2-TRPBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC4224IDDB-2-TRPBF Datasheet(HTML) 8 Page - Linear Technology |
8 / 16 page LTC4224-1/LTC4224-2 8 422412fa APPLICATIONS INFORMATION If the voltage across the sense resistor R1 becomes too high, the inrush current is limited by the internal current limit circuitry. Turn-Off Sequence The MOSFETs can be turned off by the conditions sum- marized in Table 1. Table 1. Turn-Off Conditions CONDITION RESULT CHANNEL 1 CHANNEL 2 CLEARED BY ON1 Goes High Turns Off No Effect ON1 Low ON2 Goes High No Effect Turns Off ON2 Low UVLO on VCC Turns Off Turns Off VCC > UVLO UVLO on VCC1 Turns Off No Effect VCC1 > UVLO UVLO on VCC2 No Effect Turns Off VCC2 > UVLO CH1 Overcurrent Fault Turns Off No Effect ON1 High, UVLO on VCC1 CH2 Overcurrent Fault No Effect Turns Off ON2 High, UVLO on VCC2 When ON1 or ON2 is pulled high, the corresponding GATE pin is pulled to ground by 1.5mA. With the MOSFET off, the load current discharges the load capacitor. Figure 4 shows VCC1 supply turning off by pulling ON1 high with RLOAD1 = 4.7Ω discharging CLOAD1 = 150μF. Overcurrent Fault The LTC4224 features an adjustable current limit with circuit breaker function that protects external MOSFETs against short circuits or excessive load current. The voltage across the external sense resistor is monitored by the active cur- rent limit (ACL) amplifier and the electronic circuit breaker (ECB) comparator. An overcurrent condition results in the current being limited by the ACL amplifier. During current limiting, the ECB is activated and initiates a chain of logic and timing events to handle the fault. Figure5illustratestheLTC4224’sresponsetoanovercurrent condition on one supply output. Start-up and overcurrent control for the two supplies are independent. Before time point t1, the ON pin is high and the part is in reset. When the ON pin goes low, a 10ms debounce delay is started. After 10ms (time point t2), the external MOSFET is turned on by charging GATE with 10μA. The load capacitor starts to charge up and the output voltage increases. At the same Figure 4. Normal Power-Down Sequence Figure 5. Fault Handling Sequence 0.2ms/DIV ON1 2V/DIV VOUT1 5V/DIV GATE1 5V/DIV 422412 F04 422412 F05 5ms ECB Arm RESET t3 t2 t1 t6 t5 t4 IDLE OVERCURRENT 5ms ECB BLANKING DELAY 5ms START-UP BLANKING DELAY 10ms DEBOUNCE DELAY ON FAULT VOUT IOUT ILIMIT ILIMIT |
Similar Part No. - LTC4224IDDB-2-TRPBF |
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