Ordering number : EN8793B Monolithic Digital IC LB11961 Single-Phase Full-Wave Fan Motor Driver 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) • 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 Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "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, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for new introduction or other application different from current conditions on the usage of automotive device, communication device, office equipment, industrial equipment etc. , please consult with us about usage condition (temperature, operation time etc.) prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' s products or equipment. 92111 SY 20110915-S00002/31407 TI PC 20070206-S00002 B8-6878 No.8793-1/7 LB11961 Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol VCC maximum output voltage VCC max OUT pin maximum output IOUT max Conditions Ratings current OUT pin output voltage Unit 18 V 1.0 A VOUT max 18 V HB maximum output current IHB max 10 mA VTH input pin voltage VTH max 6 V RD/FG output pin output voltage VRD/FG max 18 V RD/FG output current IRD/FG max 10 mA Allowable power dissipation 1.1 W Operating temperature Pd max Topr When mounted on a circuit board *1 -30 to +90 °C Storage temperature Tstg -55 to +150 °C *1 Specified circuit board : 114.3 × 76.1 × 1.6mm3, glass epoxy. Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time. Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details. Recommended Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings Unit VCC supply voltage VCC 4.5 to 16 V VTH input level voltage range VTH 0 to 9 V Hall sensor input common-mode VICM 0.2 to 3 V input voltage range Electrical Characteristics Unless otherwise specified Ta = 25°C, VCC = 12V Ratings Parameter Symbol Conditions Unit min Circuit current 6VREG voltage HB voltage ICC1 Drive mode ICC2 Lock protection mode V6VREG VHB I6VREG = 5mA IHB = 5mA typ max 12 18 24 mA 8 11 16 mA V 5.8 6 6.2 1.10 1.25 1.40 V CPWM high-level voltage VCRH 3.45 3.6 3.75 V CPWM low-level voltage VCRL 1.95 2.05 2.15 V CPWM oscillator frequency FPWM 18 25 32 CT pin high-level voltage VCTH 3.45 3.6 3.75 V CT pin low-level voltage VCTL 1.55 1.7 1.85 V C = 100pF kHz ICT charge current ICT1 1.5 2 2.5 μA ICT discharge current ICT2 0.15 0.2 0.25 μA ICT charge/discharge current RCT 8.5 10 11.5 ratio OUT output low saturation VOL IO = 200mA 0.2 0.3 V VOH IO = 200mA 0.9 1.1 V Zero peak value (including offset and 10 20 mV 0.2 0.3 V 30 μA voltage OUT output high saturation voltage Hall sensor input sensitivity VHN hysteresis) RD/FG output pin low-level VRDL/FGL IRD/FG = 5mA IRDL/FGL VRD/FG = 7V voltage RD/FG output pin leakage current No.8793-2/7 LB11961 Package Dimensions unit : mm (typ) 3313 6.5 Pd max – Ta 1.2 0.5 6.4 Allowable power dissipation, Pd max – W 8 4.4 14 1 1.3 7 0.22 0.15 0.65 0.1 (1.3) 1.5max (2.35) 1.5 Specified circuit board : 114.3×76.1×1.6mm3 glass epoxy board 1.1 1.0 0.8 0.6 0.53 0.4 0.2 0 – 30 – 10 10 30 50 70 90 110 Ambient temperature, Ta – °C SANYO : HSSOP14(225mil) Truth Table VTH IN- IN+ Low High Low (open) Low High High High Low Low High - High Low - Low High CPWM CT High Low Low - High OUT1 OUT2 FG High Low Low Low High Off Off Low Low Low Off Off High Off Low Off High Off RD Mode During rotation − drive (PWM off) On During rotation − regeneration (PWM on) Off Lock protection 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. No.8793-3/7 LB11961 Pin Assignment F-GND (P-GND) F-GND (P-GND) OUT2 1 14 OUT1 VCC 2 13 S-GND RMI 3 12 CT VTH 4 11 6VREG CPWM 5 10 IN- FG 6 9 HB RD 7 8 IN+ LB11961 Top view F-GND (P-GND) : The motor system ground and the heat sink. Since the heat generated Since the heat generated by the chip is dissipated through F-GND, the thermal resistance is lowered by increasing the area of the copper foil and solder surface in the printed circuit pattern. S-GND : Control system ground Block Diagram FG RD Thermal protection circuit VCC Constant voltage 6VREG Delay circuit Control circuit 1.3V HB Hall OUT2 M IN+ Delay circuit OUT1 IN− Amplifier with hysteresis Charge/discharge circuit S-GND CT VTH Oscillator circuit CPWM P-GND No.8793-4/7 LB11961 Application Circuit Example *2 CM VCC HB *7 IN− H FG *3 IN+ 6VREG RD *6 *5 RMI *8 OUT1 VTH OUT2 CPWM CP = 100pF *4 CT F-GND *1 CT = 0.47μF to 1μF S-GND F-GND *1. Power supply and ground lines P-GND is connected to the motor power supply system and S-GND is connected to the control circuit power supply system. These two systems should be formed from separate lines and the control system external components should be connected to S-GND. *2. Regeneration power supply stabilization capacitor The capacitor CM provides power supply stabilization for both PWM drive and kickback absorption. A capacitor with a value of over 0.1µF is used for CM. A large capacitor must be used when the coil inductance is large or when the coil resistance is low. Since this IC adopts a technique in which switching is performed by the high side transistor and regeneration is handled by the low side transistor, the pattern connecting CM to VM and P-GND must be as wide and as short as possible. *3. Hall sensor input Lines that are as short as possible must be used to prevent noise from entering the system. The Hall sensor input circuit consists of a comparator with hysteresis (20mV). We recommend that the Hall sensor input level be at least three times this hysteresis, i.e. at least 60mVp-p. *4. PWM oscillator frequency setting capacitor If a value of 100pF is used for CP, the oscillator frequency will be f = 25kHz, and this will be the basic frequency of the PWM signal. *5. RD output This is an open collector output. It outputs a low level when the motor is turning and a high level when it is stopped. This pin must be left open if unused. *6. FG output This is an open collector output, and a rotation count detection function can be implemented using this FG output, which corresponds to the phase switching. This pin must be left open if unused. *7. HB pin 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.) No.8793-5/7 LB11961 Control Timing Chart (VCC × 28%) Thermistor removed Internal lowest speed setting voltage f = 25kHz (CP=100pF) High on duty 3.6V (VCC × 30%) RMI voltage CPWM 2.0V (VCC × 16%) Low on duty 0V Set minimum speed Full speed mode PWM control variable speed mode Low temperature High temperature 12V VCC 0V FG 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. No.8793-6/7 LB11961 SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.,Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO Semiconductor Co.,Ltd. product that you intend to use. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. 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 September, 2011. Specifications and information herein are subject to change without notice. PS No.8793-7/7