LV11961HA Datasheet, PDF (12/14 Pages) ON Semiconductor – Single-phase FAN Motor Driver

Application Circuit Example
LV11961HA
M
Power
Sup pl y
*1
*2
CM
*1
PGND
(Frame)
1 OUT2
R6
R7
*7
R1
R5
R4
*6
*5
R2
C2
C3
PWM
signal Input
MN1
R3
Rotational
*10
signal output
Lock detection
*9
signal output
2 VCC
3 RMI
4 VTH
5 CPWM
6 FG
7 RD
Fig.8
PGND
*1
(Frame)
OUT1 14
*1
SGND 13
SFS 12
REG 11
*4
IN2 10
*8
C4
*3
C1
HB 9
H
IN1 8
C5
*4
*1 < Wiring of VCC and GND >
PGND (Frame) is connected to power MOSFETs and SGND is to internal circuits. Wiring of those should
be separated each other to stabilize SGND by cutting out the influence of the switching noise of power
FETs. In the event that external parts for IC are connected to GND, it should be done with SGND.
In addition, PGND (Frame) pins are effective for heat radiation. Therefore, the larger the wiring area of
PGND is, the greater the effect is. Considering heat radiation along with the switching noise, the wiring of
PGND should be widened as much as possible.
Similarly to PGND, the wiring of VCC should be widened and shortened for surpressing the noise.
*2 < Capacitor for power stabilization >
The capacitor for power stabilization should be enough value to ensure a stable operation. Of course, this
capacitor must not be removed.
Under the condition that the value of coil inductance is larger or the value of coil resistance is smaller, the
current ripple grows further. Under that condition, it should use the capacitor with larger value to absorb
this current ripple. If cannot by capacitor, it must use power-clamp with zener diode.
This capacitor should be set as close to VCC pin and PGND pin as possible.
*3 < Capacitor for stabilization of REG output voltage >
REG output voltage is the regulated voltage as power supplier to inner control circuits. Therefore, it is
necessary to stabilize by using a capacitor with enough value for preventing inner control circuits from
false operation.
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