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參數(shù)資料
| 型號： | AN8041S |
| 廠商： | PANASONIC CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Liquid crystal backlight control IC |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 153K |
| 代理商： | AN8041S |
13
Voltage Regulators
AN8041S
I
Application Notes (continued)
[3] Function descriptions (continued)
8. Output block, bootstrap circuit
In the case of the step-down type DC-DC converter control, the bootstrap circuit is required if n-channel
MOSFET is used as the switching device.
The bootstrap circuit is used for keeping the voltage between the gate and the source higher than the gate
threshold voltage of n-channel MOSFET by increasing the high-level of the Out terminal (pin 13) to a level higher
than V
CC
when turning on the n-channel MOSFET. The output block including the external circuit and the bootstrap
circuit are shown in figure 6, and the operation waveform in figure 7.
V
CC
V
CBH
V
OH
V
CC
V
DS(ON)
[V]
V
CC
0.7 [V]
V
F
V
OL
CB terminal waveform
Out terminal waveform
M1 source-side waveform
0 V
t
2
M1 On
Figure 7. Bootstrap circuit operation waveform
t
3
M1 Off
t
1
M1 Off
Turn-on
Turn-off
CB
D1
CB
14
CT
DTC
FB1
FB2
Q1
Q2
Out
13
V
C
1
PWM comparator
SBD
V
OUT
Figure 6. Output block and bootstrap circuit
V
S
V
GS
V
CB
I
1
I
2
V
D1
M1
The bootstrap circuit operation is described below.
1) N-channel MOSFET (M1) off time: t
1
While the M1 is off, energy is being supplied from the schottky barrier diode (SBD) to the choke coil, and
the M1 source side voltage V
S
is fixed to
V
F
. The capacitor for boost C
B
is charged from the V
CC
terminal
(pin 15) through the diode inside the IC (D1). The CB terminal voltage (pin 14) V
CB
is given by the following
equation:
V
S
=
V
F
V
CB
=
V
CC
V
D1
V
F
: forward voltage of SBD
V
D1
: forward voltage of D1
Therefore, the charged voltage of boost C
B
is given by the following equation:
V
CB
V
S
=
V
CC
V
D1
+
V
F
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