vn5770akp-e STMicroelectronics, vn5770akp-e Datasheet - Page 20

• Manufacturer Part Number: vn5770akp-e
• Description: Quad Smart Power Solid State Relay For Complete H-bridge Configurations
• Manufacturer: STMicroelectronics

Application information
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Note:
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Application information
Figure 33. Typical application schematic
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.
5V
5V
Micro
Micro
Current Sense
Input 1
Input 2
Input 3
Input 4
Doc ID 17772 Rev 1
Control
Control
Control
Control
Control
Control
GND
GND
Vcc
Vcc
Source 3
Source 3
Source 2
Source 2
Drain 3
Drain 3
Drain 4
Drain 4
Source 4
Source 4
Source 1
Source 1
C
C
Z
Z
I M
I M
M
M M
Vz 32V > 40V
Vz 32V > 40V
D
D
Motor inducuctance
Motor inducuctance
energy recirculation
energy recirculation
VN5770AKP-E
Vbatt
Vbatt