LB11850VA 데이터 시트보기 (PDF) - ON Semiconductor

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LB11850VA

Single‐phase Full‐wave Pre‐driver with Speed Control Function for Fan Motor

ON Semiconductor 

1. Speed Control Diagram

(RPM)

LB11850VA

DESCRIPTION OF SPEED CONTROL BLOCK

The speed slope is determined by the constant of the RC pin.

CR time constant small

CR time constant large

Rotation speed

Minimum speed

Determined by LIM pin voltage

0%

Small ← CTL signal (PWMDUTY) → Large

Large ← EO pin voltage (V) → Small

Minimum speed

setting rotation

Variable speed

ON−Duty small

CTL pin

100%

Full speed

ON−Duty large

5VREG

EO pin

0V

2. Timing at Startup (Soft Start)

Figure 4. Speed Control Diagram

LIM voltage

EO voltage

VCC pin

CTL pin

SOFT pin

Stop

Stop

Full speed

Soft start

The slope changes according to the capacitance of SOFT pin.

(Large → Large of slope)

Full speed

Figure 5. Timing at Startup (Soft Start)

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