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XC6207A122PL Datasheet(PDF) 11 Page - Torex Semiconductor |
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XC6207A122PL Datasheet(HTML) 11 Page - Torex Semiconductor |
11 / 33 page 11/32 XC6207 Series Ta=25OC INPUT VOLTAGE CL AUTO-DISCHARGE RESISTANCE 2.0V 750Ω (TYP.) 3.0V 550Ω (TYP.) 4.0V 500Ω (TYP.) 5.0V 480Ω (TYP.) 6.0V 470Ω (TYP.) ■OPERATIONAL EXPLANATION (Continued) <CL Auto-Discharge Function> XC6207B 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 VOUT pin and the VSS pin (cf. BLOCK DIAGRAM). In this state, the application is protected from a glitch operation caused by the electric charge at the output capacitor (CL). The CL auto- discharge resistance at this time depends on the input voltage. Moreover, 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), the output voltage after discharge via the N channel transistor is calculated by the following formulas. V = VOUT x e –t/τ, or t=τIn (VOUT / V) ( V : Output voltage after discharge, VOUT(E): Output voltage, t: Discharge time, τ: CL auto-discharge resistance R×Output capacitor (CL) value C) (ex.) When input voltage: 4.0V, CL auto-discharge resistance: 500Ω (TYP.); output capacitor (CL): 10μF, VOUT:3.0V, CE voltage=Changing from 4.0V to 0V (The CE pin L level signal) 1τ(500μs) after CE OFF signal is inputted, VOUT(E) becomes: 3.0V×0.368 = approx. 1.104V 2τ(1000μs) after CE OFF signal is inputted, VOUT(E) becomes: 3.0V×0.135 = approx. 0.405V 3τ(1500μs) after CE OFF signal is inputted, VOUT(E) becomes: 3.0V×0.050 = approx. 0.150V 4τ(2000μs) after CE OFF signal is inputted, VOUT(E) becomes: 3.0V×0.018 = approx. 0.055V |
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