BD6973FV-LB データシートの表示（PDF） - ROHM Semiconductor
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BD6973FV-LB Datasheet PDF : 20 Pages
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BD6973FV-LB
Datasheet
Safety Measure
1. Measures against Reverse-connection of Power Supply
Because the current flows in the reverse-connection of the power supply in different pathways when it is normal, it
causes IC destruction or deterioration. When reverse-connection is possible, reverse connection protection diode must
be added between power supply and Vcc.
After reverse connection
In normal energization
Reverse power connection
destruction prevention
Vcc
Circuit
I/O
Block
Vcc
Circuit
I/O
Block
Vcc
Circuit
I/O
Block
GND
GND
GND
Internal circuit impedance is high
Amperage small
Large current flows
Thermal destruction
Figure 28. Flow of Current When Power Supply is Connected Reversely
No destruction
2. Measure against Vcc Voltage Rise by Induction (Back) Electromotive Force
Induction electromotive force (and/or Back electromotive force) generates regenerative current to power supply.
However, when reverse connection protection diode is connected, or power supply doesn't have the current inflow
ability with enough, Vcc and Motor driving outputs voltage rise at regenerative braking.
ON
Phase
Switching
ON
ON
ON
Figure 29. Vcc and Motor Driving Outputs Voltage Rise by Induction (Back) Electromotive Force
When the absolute maximum rated voltage may be exceeded due to voltage rise by induction electromotive force,
place Capacitor or Zenner diode between Vcc and GND. If necessary, add both.
(A) Capacitor
(B) Zenner diode
(C) Capacitor & Zenner diode
ON
ON
ON
ON
ON
ON
Figure 30. Measure against Vcc and Motor Driving Outputs Voltage Rise at Regenerative Braking
3. Problem of GND Line PWM Switching
Do not perform PWM switching of GND line because GND pin potential cannot be kept to a minimum.
4. Protection of Rotation Speed Pulse (FG) and/or Lock Alarm (AL) Open-drain Output
It is possible to protect it so as not to become destruction by putting the protection resistor in the motor unit when the
connector is mistaken and it is connected directly with the power supply exceeding the absolute maximum rating.
Motor Unit
Controller
Vcc
Motor
M
Driver
GND
PWM Input
Driver
AL
FG
Protectio n
Resistor
Pull-up
Resistor
SIG
Connecto r
Prohibit
Figure 31. GND Line PWM Switching Prohibited
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© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/17
Figure 32. Protection of FG/AL Pin
TSZ02201-0H1H0B100820-1-2
27.Feb.2014 Rev.002
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