LB11620T-TLM-E Datasheet, PDF (13/13 Pages) ON Semiconductor – Brushless Motor Driver

LB11620T
11. Power Supply Stabilization
Since this IC uses a switching drive technique, the power supply line level can be disturbed easily. Therefore capacitors
with adequate capacitance to stabilize the power supply line must be inserted between VCC and ground.
If diodes are inserted in the power supply lines to prevent destruction if the power supply is connected with reverse
polarity, the power supply lines are even more easily disrupted, and even larger capacitors are required.
If the power supply is turned on and off by a switch, and if there is a significant distance between that switch and the
stabilization capacitor, the supply voltage can be disrupted significantly by the line inductance and surge current into
the capacitor. As a result, the withstand voltage of the device may be exceeded. In application such as this, the surge
current must be suppressed and the voltage rise prevented by not using ceramic capacitors with a low series impedance,
and by using electrolytic capacitors instead.
12. VREG Stabilization
To stabilize the VREG voltage, which is the control circuit power supply, a 0.1μF or larger capacitor must be inserted
between the VREG pin and ground. The ground side of this capacitor must connected to the IC ground pin with a line
that is as short as possible.
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PS No.A0662-13/13