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XC9237A0ACMR Datasheet(PDF) 11 Page - Torex Semiconductor |
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XC9237A0ACMR Datasheet(HTML) 11 Page - Torex Semiconductor |
11 / 28 page 11/28 XC9235/XC9236/XC9237 Series Output Voltage Dischage Characteristics Rdischg () = 300Ω TYP Discharge Time t (ms) 0 10 20 30 40 50 60 70 80 90 100 0 10 20304050 607080 90 100 CL=10uF CL=20uF CL=50uF ■OPERATIONAL DESCRIPTION (Continued) <CL High Speed Discharge> XC9235B(C)/ XC9236B(C)/ XC9237B(C) series can quickly discharge the electric charge at the output capacitor (CL) when a low signal to the CE pin which enables a whole IC circuit put into OFF state, is inputted via the N-channel transistor located between the LX pin and the VSS pin. When the IC is disabled, electric charge at the output capacitor (CL) is quickly discharged so that it may avoid application malfunction. Discharge time of the output capacitor (CL) is set by the CL auto-discharge resistance (R) and the output capacitor (CL). By setting time constant of a CL auto-discharge resistance value [R] and an output capacitor value (CL) as τ(τ=C x R), discharge time of the output voltage after discharge via the N channel transistor is calculated by the following formulas. V = VOUT(E) x e –t/τ, or t=τln (VOUT(E) / V) V : Output voltage after discharge VOUT(E) : Output voltage t: Discharge time, τ: C x R C= Capacitance of Output capacitor (CL) R= CL auto-discharge resistance |
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