Ordering number : EN8793B
Monolithic Digital IC
Fan Motor Driver
The LB11961 is a single-phase bipolar drive motor driver that easily implements direct PWM motor drive systems with
excellent efficiency. The LB11961 is optimal for fan motor drive in personal computer power supply systems and CPU
cooling fan systems.
• Single-phase full-wave drive (16V, 1.0A transistors are built in)
• Built-in variable speed function controlled by a thermistor input
The LB11961 can implement quiet, low-vibration variable speed control using externally clocked high side transistor
direct PWM drive.
• Built-in regenerative diode (Di); only requires a minimal number of external components.
• Built-in HB
• Minimum speed setting pin (allows full-speed mode operation at startup)
• Operates in full-speed mode when the thermistor is removed.
• Built-in lock protection and automatic recovery circuits
• FG (speed detection) and RD (lock detection) outputs
• Built-in thermal shutdown circuit
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"standard application", intended for the use as general electronics equipment. The products mentioned herein
shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life,
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the performance, characteristics, and functions of the described products in the independent state, and are not
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92111 SY 20110915-S00002/31407 TI PC 20070206-S00002 B8-6878 No.8793-1/7