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參數(shù)資料
| 型號(hào)： | AN8041S |
| 廠商： | PANASONIC CORP |
| 元件分類： | 模擬信號(hào)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(yè)數(shù)： | 14/15頁(yè) |
| 文件大小： | 153K |
| 代理商： | AN8041S |
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14
AN8041S
Voltage Regulators
I
Application Notes (continued)
[3] Function descriptions (continued)
8. Output block, bootstrap circuit (continued)
2) N-channel MOSFET (M1) turn-on time: t
2
When the PWM comparator output reverses, the Out terminal (pin 13) is switched over to high-level. The
Out terminal voltage V
O
rises toward the CB terminal voltage.
V
O
=
V
CB
V
CE
(sat)
At that time, M1 voltage between the gate and source becomes:
V
GS
=
V
O
+
V
F
When the Out terminal voltage V
O
rises to the gate threshold voltage, the M1 is turned on. The M1 source-
side voltage after the turn-on rises to the value expressed in the following equation:
V
S
=
V
CC
V
DS(ON)
Since the bootstrap capacitor C
B
is connected between the M1 source-side and the CB terminal, the CB
terminal voltage is capacitance-coupled, and rises according to the M1 source-side voltage. It is expressed in
the following equation:
V
CB
=
V
S
+
V
CC
V
D1
+
V
F
=
2
×
V
CC
V
D1
+
V
DS(ON)
+
V
F
3) N-channel MOSFET (M1) turn-off time: t
3
The Out terminal voltage drops to the saturation voltage of the transistor Q1 and it is turned off.
The M1 source side voltage decreases to
V
F
, and in the same way the CB terminal voltage is capacitance-
coupled, and drops to V
CC
V
D1
volt, and returns to the condition described in a).
Bootstrap circuit usage notes
(1) Operating supply voltage range when the step-down circuit is used
When the step-down circuit is used for the DC-DC converter control : As described in the above, when
the n-channel MOSFET of the switching device turns on, the voltage of CB terminal (pin 14) rises to the voltage
about two times higher than the V
CC
. Since the allowable applied voltage for the CB terminal is 35 V, use the
boost circuit at an operating supply voltage of 3.6 V or more.
V
CB
=
2
×
V
CC
V
D1
V
DS(ON)
+
V
F
<
35 [V]
35
+
V
D1
+
V
DS(ON)
V
F
[V]
2
<
17 [V]
V
CC
<
(2) Value setting for bootstrap capacitor
The bootstrap capacitor is capacitors-coupled with the n-channel MOSFET source-side at its turn-on time
to increase the CB terminal voltage over the V
CC
. At this time, the bootstrap capacitor is discharged by the
n-channel MOSFET gate drive current. If the capacitance value of the bootstrap capacitor is set at too low
value, it causes the efficiency decrease due to increase in switching loss.
Therefore, set the capacitance at a sufficiently high value compared with the n-channel MOSFET gate
input capacitance.
CB
>>
Ciss
Study with the actual mounting board and set the optimum value.
(3) CB terminal connection when the booster circuit is used
In the case of using the step-up type DC-DC converter control, the bootstrap circuit is not required since
the n-channel MOSFET source side is grounded. Therefore, use it by short-circuiting the CB terminal (pin
14) to the V
CC
terminal (pin 15).
For that reason, the operating supply voltage range is 3.6 V to 34 V in the case of using the step-up circuit
type.
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