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UC1832J bảng dữ liệu(PDF) 5 Page - Texas Instruments |
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UC1832J bảng dữ liệu(HTML) 5 Page - Texas Instruments |
5 / 18 page UC1832 UC2832/3 UC3832/3 APPLICATION AND OPERATION INFORMATION (cont.) UDG-92042-1 UDG-92043-1 PNP Pass (Low Drop-Out Regulator) (UCx833) NPN Pass (Medium Power, Low Drop-Out Regulator) (UCx832) For any power supply, the rate at which the total output capacitance can be charged depends on the maximum output current available and on the nature of the load. For a constant-current current-limited power supply, the out- put will come up if the load asks for less than the maxi- mum available short-circuit limit current. To guarantee recovery of a duty-ratio current-limited power supply from a short-circuited load condition, there is a maximum total output capacitance which can be charged for a given unit ON time. The design value of ON time can be adjusted by changing the timing capacitor. Nominally, TON = 0.693 x 10k x CT. Typically, the IC regulates output current to a maximum of IMAX = K x ITH, where ITH is the timer trip-point current, and K = Current Sense Amplifier Offset Voltage 100 mA ≈1.35 for UCx833, and is variable from 1.35 to 3.05 with VADJ for the UCx832. For a worst-case constant-current load of value just less than ITH, CMAX can be estimated from: CMAX = ((K−1)ITH) ( TON VOUT ), where VOUT is the nominal regulator output voltage. For a resistive load of value RL, the value of CMAX can be estimated from: CMAX = TON RL • 1 In [ (1− VOUT K • ITH • RL) −1 ] . Estimating Maximum Load Capacitance 5 |
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