lb11852fv Sanyo Semiconductor Corporation, lb11852fv Datasheet - Page 8

• Manufacturer Part Number: lb11852fv
• Description: For Fan Motor Single-phase Full-wave Pre-driver With Speed Control Function
• Manufacturer: Sanyo Semiconductor Corporation

Description of Speed Control Block
1. Speed control diagram
2. Timing at startup (soft start)
CTL pin
EO pin
Minimum speed setting rotation
Minimum speed
5VREG
Rotational speed
0V
On-duty small
(RPM)
V CC pin
CTL pin
SOFT pin
0%
CR time constant small
Small ← CTL signal (PWMDUTY) → Large
Large ←
Stop
Stop
Variable speed
The slope is determined by the RC pin constant.
LB11852FV
Full speed
EO pin voltage (V)
Full speed
Soft start
The slope changes depending on the
capacitance of the SOFT pin
(large capacitance large slope).
Determined by LIM pin voltage
→ Small
On-duty large
CR time constant large
Full speed
EO voltage
100%
LIM voltage
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