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XC9237A0ACMR Datasheet(PDF) 11 Page - Torex Semiconductor

Part # XC9237A0ACMR
Description  600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
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Manufacturer  TOREX [Torex Semiconductor]
Direct Link  http://www.torex.co.jp
Logo TOREX - Torex Semiconductor

XC9237A0ACMR Datasheet(HTML) 11 Page - Torex Semiconductor

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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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