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參數(shù)資料
| 型號(hào)： | MB3789 |
| 廠商： | Fujitsu Limited |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 21/28頁(yè) |
| 文件大?。?/td> | 214K |
| 代理商： | MB3789 |
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21
MB3789
3.
Operation of the Bootstrap Capacitor
When voltage V
OUT
at the OUT pin (pin 15) is “L” level, the voltages (V
C1
) at both ends of the bootstrap capacitor
C
BS
is charged up to the V
CC
2 voltage level by charge current (i
C
).
When V
OUT
changes from “L” level to “H” level, the CB pin (pin 13) voltage V
CBS
rises to 2
×
V
CC
2 and V
OUT
reaches almost the V
CC
2 level.
The charge accumulated at C
BS
at this time is released by discharge current i
d
(output unit supply current).
See Figure 12 for circuit operation.
~
12
10
8
6
4
2
0
6
4
2
0
0
20
40
60
80
100
t
ON
t
OFF
2 V
2 V
10
μ
s
*2
O
O
C
C
Time t (
μ
s)
(V
CC
1 = 5 V, V
CC
2 = 6 V, C
BS
= 4700 pF)
V
CBS*1
V
OUT
*1: Use the device with a setting of V
CBS
18 V.
*2: The slant of V
CBS
is determined by the value of discharge current i
d
(output unit supply current).
Figure 14 Bootstrap operating waveform
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