LV8804V Sanyo Semiconductor Corporation, LV8804V Datasheet - Page 8

• Manufacturer Part Number: LV8804V
• Description: PC and Server Fan Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

Application Circuit Example
*1. Power supply and GND wiring
*2. Power-side power stabilization capacitor
*3. COMIN and FIL pins
*4. CT pin
PWM
The GND is connected to the control circuit power supply system.
For the power-side power stabilization capacitor, use a capacitor of 10µF or more.
Connect the capacitor between V CC and GND with a thick and along the shortest possible route.
The V CC pins (pins 32, 33, 34, and 35) must be short-circuited on the print pattern.
The GND pins (pins 18 and 19) and the SUB_GND pin (pin 23) must be short-circuited on the print pattern.
These pins are used to connect the filter capacitor. The LV8804 uses the back EMF signal generated when the motor is
running to detect the information on the rotor position. The IC determines the timing at which the output block applies
current to the motor based on the position information obtained here. Insert a filter capacitor with a capacitance
ranging from 1,000pF to 10,000pF (reference value) between the COMIN pin and FIL pin to prevent any motor startup
miss-operation that is caused by noise. However, care must be taken since an excessively high capacitance will give
rise to deterioration in efficiency and delays in the output power-on timing while the motor is running at high speed.
Furthermore, connect the capacitor between the COMIN pin and FIL pin as close as possible in order to avoid the
effects of noise from other sources.
This pin is used to connect the lock detection capacitor.
The constant-current charging and constant-current discharging circuits incorporated causes locking when the pin
voltage reaches 2.5V, and releasing the lock protection when it drops to 0.5V. This pin must be connected to the GND
when it is not going to be used.
1µF/10V
10kΩ
68kΩ
22kΩ
47kΩ
27kΩ
*4
1µF
*2
10µF/25V
0.1µF
47kΩ
47kΩ
*6
1µF
1µF
*9
*9
0.1µF
*8
*7
1000pF
VG
CP
CPC
VREG
MINSP
CTL
FR
CT
SOFTST
OSC
LV8804V
*1
GND SUB
V CC
COMIN
GND
1/2FG
COM
WO
UO
VO
FIL
RD
FG
RF
0.25Ω
*5
*3
0.01µF
RFG, R1/2FG
=10k to 100kΩ
RRD=10k to 100kΩ
No.A1407-8/10