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參數(shù)資料
| 型號(hào)： | AN8014 |
| 廠商： | Panasonic Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Step-down, step-up, or inverting DC-DC converter control IC |
| 中文描述： | 降壓，升壓或反相的DC - DC轉(zhuǎn)換器控制IC |
| 文件頁數(shù)： | 12/18頁 |
| 文件大?。?/td> | 151K |
| 代理商： | AN8014 |
AN8014S
Voltage regulators
12
I
Application Notes (continued)
[1] Function descriptions (continued)
9. Bootstrap circuit of output block
If the n-channel MOSFET is used as a switching device for DC-DC converter control of step down method,
a bootstrap circuit is required.
Bootstrap circuit ensures that the gate-source voltage is gate threshold voltage or higher by going up the high
level of the Out pin (pin 13) than V
CC
voltage when n-channel MOSFET turns on. Figure 7 shows the output of
bootstrap circuit including the external circuit. Figure 8 shows the operating waveform of the bootstrap circuit.
14
Figure 7. Bootstrap circuit of output block
PWM comparator
CT
DTC
FB
V-Out
V
S
M1
V
GS
V
CB
SBD
C
B
V
CC
V
D1
I
1
I
2
15
13
Out
CB
Q1
D1
Q2
t
1
M1 Off
t
2
M1 On
Figure 8. Bootstrap circuit operating waveform
t
3
M1 Off
V
CBH
V
OH
V
CC
V
DS(ON)
[V]
V
CC
0.7 [V]
V
OL
V
F
V
CC
Turns off
Turns off
CB pin waveform
Out pin waveform
M1 source side waveform
0 V
The following describes the operation of the bootstrap circuit.
1) N-channel MOSFET (M1) off time: t
1
While the M1 is turned off, the choke coil is provided with energy from the schottky barrier diode (SBD)
and the source-side voltage V
S
of the M1 is fixed to
V
F
. The bootstrap capacitor C
B
is charged from the V
CC
pin (pin 15) through the AN8014S's internal diode D1.
The voltage V
CB
on the CB pin (pin 14) is expressed by the following.
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 bootstrap capacitor C
B
is expressed by the following.
V
CB
V
S
=
V
CC
V
D1
+
V
F
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AN8014S | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Step-down, step-up, or inverting DC-DC converter control IC |
| AN8014S-E1 | 功能描述:IC REG CTRLR BST INV PWM SO16 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| AN8015SH | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Single-channel step-down, step-up, or inverting use DC-DC converter control IC |
| AN8015SH-E1 | 功能描述:IC REG CTRLR BST INV PWM 10-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
| AN8015SH-E1V | 功能描述:IC REG CTRLR BST INV PWM SSOP10 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁面:1316 (CN2011-ZH PDF) |
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