參數(shù)資料
型號: VN5770AK-E
廠商: 意法半導體
英文描述: Quad smart power solid state relay for complete H bridge configurations
中文描述: 四完整的智能功率H橋配置固態(tài)繼電器
文件頁數(shù): 20/31頁
文件大?。?/td> 429K
代理商: VN5770AK-E
Application information
VN5770AK-E
20/31
4
Application information
Figure 33.
Typical application schematic
Figure 34.
Recommended motor operation
M
Input 1
Input 3
Micro
5V
Vcc
Source 1
Source 2
Source 3
Source 4
Drain 3
Drain 4
GND
Vbatt
Vz 32V > 40V
Motor inducuctance
energy recirculation
Control
Control
Control
C
D
Z
I M
Input 2
Input 4
Current Sense
Mostly motor bridge drivers use a reverse battery protection diode (D) inside supply rail. This diode prevents a reverse
current flow back to Vbatt in case the bridge gets disabled via the logic inputs while motor inductance still carries
energy. In order to prevent a hazardous overvoltage at circuit supply terminal (Vcc), a blocking capacitor (C) is needed
to limit the voltage overshoot. As basic orientation, 50μF per 1A load current in recommended. In alternative, also a
Zener protection (Z) is suitable.
Even if a reverse polarity diode is not present, it is recommended to use a capacitor or zener at Vcc because a similar
problem appears in case supply terminal of the module has intermittent electrical contact to the battery or gets
disconnected while motor is operating.
Input 1
Input 2
Input 3
Input 4
+I M
- I M
Vz
Vcc
t
t
oeain
by Zener diode Z
into capacitor C
current protection tim e
Dead tim e to avoid cross conduction
Cokwseoeain
oeain
Pasvemoo tp
Cokws prto
Flyback clamped
Flyback energy charged
Flyback spike during cross
Pasvemoo tp
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