lb11961 Sanyo Semiconductor Corporation, lb11961 Datasheet
lb11961
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lb11961 Summary of contents
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... LB11961 Overview 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. Features • Single-phase full-wave drive (16V, 1.0A transistors are built in) • ...
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... OUT output high saturation V OH voltage Hall sensor input sensitivity VHN RD/FG output pin low-level VRDL/FGL voltage RD/FG output pin leakage IRDL/FGL current LB11961 Conditions When mounted on a circuit board * glass epoxy. Conditions Conditions Drive mode Lock protection mode I6VREG = 5mA IHB = 5mA ...
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... Low High - High Low - - Low High CPWM – High is the state where CPWM > VTH, and CPWM– Low is the state where CPWM < VTH. Open : The LB11961 operates in full-speed mode when the thermistor is removed. LB11961 1.2 Specified circuit board : 114.3×76.1×1.6mm 1.1 1.0 0.8 0.6 0.4 0.2 0 – ...
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... V CC Constant voltage 6VREG 1.3V HB Hall IN+ IN− Amplifier with hysteresis Charge/discharge circuit S-GND CT LB11961 F-GND (P-GND OUT1 S-GND 2 13 LB11961 6VREG IN IN+ Top view RD FG Delay circuit Control circuit Delay circuit Oscillator circuit ...
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... This pin provides a Hall effect sensor bias constant-voltage output of 1.25V. *8. RMI pin Connect this pin to VTH if unused. Even if unused, the IC is set internally to operate at a 10% drive duty at the voltage corresponding to the lowest speed. (The capacitor is used to set up full-speed mode at startup.) LB11961 * ...
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... 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. ...
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... SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of March, 2007. Specifications and information herein are subject to change without notice. LB11961 PS No.8793-7/7 ...