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UC2832-EP データシート(PDF) 6 Page - Texas Instruments |
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UC2832-EP データシート(HTML) 6 Page - Texas Instruments |
6 / 13 page UC2832-EP PRECISION LOW DROPOUT LINEAR CONTROLLER SGLS147A – JANUARY 2003 – REVISED MARCH 2003 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION AND OPERATION INFORMATION Estimating Maximum Load Capacitance 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 output will come up if the load asks for less than the maximum available short-circuit limit current. To ensure 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 10 kΩ 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 and is variable from 1.35 to 3.05 with VADJ. For a worst-case constant-current load of value just less than ITH, CMAX can be estimated from: C MAX + K * 1 TH T ON V OUT where VOUT is the nominal regulator output voltage. For a resistive load of value RL, the value of CMAX can be estimated from: C MAX + T ON R L 1 In 1 * V OUT K I TH R L –1 320 280 260 240 220 200 180 160 300 140 120 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.5 2.25 VADJ (Pin 11) – V Figure 2. Current Sense Amplifier Offset Voltage vs VADJ |
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同様の説明 - UC2832-EP |
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