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LB11961 Fiches technique(PDF) 6 Page - Sanyo Semicon Device

No de pièce LB11961
Description  Single-Phase Full-Wave Fan Motor Driver
Download  7 Pages
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Fabricant  SANYO [Sanyo Semicon Device]
Site Internet  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LB11961 Fiches technique(HTML) 6 Page - Sanyo Semicon Device

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LB11961
No.8793-6/7
Control Timing Chart
1. Set minimum speed mode
A VTH voltage level is generated when the thermistor detects the set temperature. At low temperatures, the fan
motor turns at the lowest speed, which is set with the RMI pin. The LB11961 compares the CPWM oscillator
voltage with the RMI pin voltage and sets the duty for the lowest drive state.
2. High speed
↔ low speed mode
The PWM signal is controlled by comparing the CPWM oscillation voltage that cycles between 1.2V and 3. 8V
and the VTH voltage.
When the VTH voltage is lower, the high and low side transistors are turned on, and when the VTH voltage is
higher, the high side transistor is turned off and the coil current is regenerated through the low side transistor.
Thus the output on duty increases as the VTH voltage becomes lower, the coil current increases, and the motor
speed increases.
Rotation speed feedback is provided by the FG output.
3. Full-speed mode
The LB11961 switches to full-speed mode above a certain temperature.
4. Thermistor removed mode
If the thermistor is removed, the VTH input voltage will rise. However, the output will go to full drive at 100%
and the motor will run at full speed.
Thermistor removed
VCC
CPWM
3.6V
2.0V
PWM control variable speed mode
Full speed mode
0V
0V
12V
f = 25kHz (CP=100pF)
Low on duty
High on duty
FG
Set minimum
speed
RMI voltage
Internal lowest speed setting voltage
(VCC × 30%)
(VCC × 16%)
(VCC × 28%)
High
temperature
Low
temperature


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