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XCL205/XCL206/XCL207 Series
■ OPERATIONAL DESCRIPTION (Continued)
＜ C L High Speed Discharge ＞
The XCL205B(C,G)/ XCL206B(C,G)/ XCL207B(C,G) series can quickly discharge the electric charge at the output capacitor (C L )
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 L X pin and the V SS pin. When the IC is disabled, electric charge at the output capacitor (C L ) is quickly
discharged so that it may avoid application malfunction. Discharge time of the output capacitor (C L ) is set by the C L
auto-discharge resistance (R) and the output capacitor (C L ). By setting time constant of a C L auto-discharge resistance value [R]
and an output capacitor value (C L ) as τ ( τ =C x R), discharge time of the output voltage after discharge via the N channel
transistor is calculated by the following formula.
V = V OUT(T) x e –t/ τ or t= τ ln (V OUT(T) / V)
V : Output voltage after discharge
V OUT(T) : Output voltage
t: Discharge time,
τ : C x R
C= Capacitance of Output capacitor (C L )
R= C L auto-discharge resistance
Output Voltage Discharge Characteristics
R DCHG =300 Ω (TYP.)
100
80
60
40
20
0
CL=10uF
CL=20uF
CL=50uF
0
20
40
60
80
100
Discharge Time ｔ(ms)
12/25
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