XC9236 Torex Semiconductor, XC9236 Datasheet - Page 11

• Manufacturer Part Number: XC9236
• Description: 600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
• Manufacturer: Torex Semiconductor

■OPERATIONAL DESCRIPTION (Continued)
＜C
XC9235B(C)/ XC9236B(C)/ XC9237B(C) series can quickly discharge the electric charge at the output capacitor (C
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
discharged so that it may avoid application malfunction. Discharge time of the output capacitor (C
auto-discharge resistance (R) and the output capacitor (C
value [R] and an output capacitor value (C
channel transistor is calculated by the following formulas.
V = V
L
V : Output voltage after discharge
V
t: Discharge time,
τ: C x R
High Speed Discharge＞
OUT(E)
OUT(E)
C= Capacitance of Output capacitor (C
R= C
x e
: Output voltage
L
–t/
auto-discharge resistance
τ
, or t=τln (V
X
pin and the V
OUT(E)
100
90
80
70
60
50
40
30
20
10
0
SS
/ V)
0
pin. When the IC is disabled, electric charge at the output capacitor (C
L
) as τ(τ=C x R), discharge time of the output voltage after discharge via the N
10
Output Voltage Dischage Characteristics
L
)
20
30
Discharge Time t (ms)
L
). By setting time constant of a C
40
50
Rdischg
60
70
= 300Ω TYP
CL=10uF
CL=20uF
CL=50uF
80
（
90
XC9235/XC9236/XC9237
L
auto-discharge resistance
100
）
L
) is set by the C
L
) is quickly
L
L
) when
Series
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