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TCV7103AF Datasheet(PDF) 8 Page - Toshiba Semiconductor |
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TCV7103AF Datasheet(HTML) 8 Page - Toshiba Semiconductor |
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8 / 17 page  TCV7103AF 2012-02-28 8 Overcurrent Protection（OCP） TCV7103AF has an overcurrent protection with latch function. When a peak current of LX pin exceeds a ILIM = 8.5A (typ.)@ VIN = 5V, ON time of high-side switch (internal) is limited. When OCP is in operation, and VFB input voltage drops below latch detection voltage VLOC = 0.3V (typ.) for more than latch detection time tLOC = 2ms (typ.), TCV7103AF will halt the output voltage and this state is latched. When the EN pin level changes from high to low, or the input voltage becomes under VUV=2.45V (typ.), releases the latch. While soft-start feature is in operation, OCP does not operate. In the condition with low input voltage, the current limitation value tends to decrease. In the condition of less than VIN =3.8V, please use it below output current IOUT =6.0A (max). Figure 4 Overcurrent Protection Operation Undervoltage Lockout (UVLO) The TCV7103AF has undervoltage lockout (UVLO) protection circuitry. The TCV7103AF does not provide output voltage (VOUT) until the input voltage (VIN2) has reached VUVR = 2.55 V (typ.). UVLO has hysteresis of 0.1 V (typ.). After the switch turns on, if VIN2 drops below VUV = 2.45 V (typ.), UVLO shuts off the switch at VOUT. Figure 5 Undervoltage Lockout Operation Soft start VIN2 Hysteresis: ΔVUV Undervoltage lockout detection voltage VUV Switching operation stops GND VOUT GND Undervoltage lockout recovery voltage VUVR Switching operation starts ILX (peak) VLOC =0.3V (typ.) ILIM =8.5A (typ.) Overcurrent period tLOC =2ms(typ.) Output voltage stop VFB =0.8V (typ.) VFB |
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