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
文件頁數(shù): 19/28頁
文件大小: 214K
代理商: MB3789
19
MB3789
I
SETTING THE BOOTSTRAP CAPACITOR
When a bootstrap capacitor is connected, it raises the output-ON voltage (at the OUT pin (pin 15) when the
external MOS FET is turned “ON”) to the V
CC
2 level. It can therefore drive the MOS FET at a higher threshold
voltage (V
th
).
Connecting the bootstrap capacitor
1.
Connect the bootstrap capacitor between the CB pin (pin 13) and OUT pin (pin 15).
Calculation of bootstrap capacitance
t
ON
(max): Maximum ON duty time
~
CB
OUT
10 k
V
CC
2
V
CC
2
V
CC
1
V
CBS
V
OUT
C
BS
External
MOS FET
: Charge current i
c
: Discharge current i
d
I
i
d
i
C
13
14
15
Figure 12 Circuit with a bootstrap capacitor connected and current flow
500
×
10
6
V
CC
2 – 2.6
C
BS
×
t
ON
(max) [pF]
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