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| Ordering number : EN6205 LB1695D Monolithic Digital IC LB1695D Three-Phase Brushless Motor Driver for DC Fan Overview The LB1695D is a driver IC for 3-phase brushless DC fan motors such as used in water heaters and other domestic electrical appliances. Package Dimensions unit: mm 3037A-DIP20H [LB1695D] 20 11 * * * * * * * Three-phase brushless motor driver Withstand voltage 45V, output current 2A Built-in current limiter Built-in low-voltage protection circuit Built-in thermal shutdown circuit Built-in Hall amplifier with hysteresis FG output function R1.7 12.7 11.2 8.4 Features 1 20.0 27.0 10 2.07 2.54 0.6 1.3 4.0 4.0 SANYO : DIP20H Specifications Absolute Maximum Ratings at Ta = 25C Parameter Maximum supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max VM max IO max Pd max1 Pd max2 Topr Tstg Conditions Ratings 10 45 2.0 3 20 -20 to +100 -55 to +150 Unit V V A W W C C IC only With an arbitrary large heat sink Allowable Operating Ranges at Ta = 25C Parameter Power supply voltage range Power supply startup voltage slew rate Symbol VCC VM VCC/t VM/t Conditions Ratings 4.5 to 9.0 5 to 42 Up to 0.04 Up to 0.16 Unit V V V / s V / s VCC = VLVSD (OFF) point VM = 0V point *1 *1 *1 After power-on, if the power supply voltage rise is fast, there may be some feedthrough current in the output. Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO 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 products described or contained herein. SANYO Electric Co.,Ltd. Semiconductor Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 63099RM(KI) No. 6205-1/10 0.4 LB1695D Electrical Characteristics at Ta = 25C, VCC = 5V, VM = 30V Parameter Power supply current Output saturation voltage Symbol ICC VOsat1 VOsat2 IO leak Conditions Forward IO = 0.5A VO (sink) + VO (source) IO = 1.0A VO (sink) + VO (source) min Ratings typ 13 1.8 2.1 max 19 2.4 2.8 100 Unit mA V V A A V mV mV mV V k V V V C C 4.1 4.5 0.6 50 150 0.5 2.5 78 222 V V V A A V V s s Output leakage current [Hall amplifier] Input bias current I HB Common mode input voltage range VICM Hysteresis width VIN Input voltage L -> H VSLH Input voltage H -> L VSHL [FG pin (Speed pulse output)] Output Low level voltage VFGL Pull-up resistor value RFG [Forward/reverse operation] Forward VFR1 Reverse VFR2 [Current limiter operation] Limiter VRF [Thermal shutdown operation] Operating temperature TSD Hysteresis width TSD [Low-voltage protection circuit operation] Operating voltage VLVSD Release voltage VLVSD(OFF) Hysteresis width VLVSD [C pin] Charge current ICL Discharge current ICH Charge start voltage VCL Discharge start voltage VCH Output current ignore time t sm Output off time t so 1.5 21 5 -25 IFG = 5 mA 7.5 0 4.2 0.42 Design target value Design target value 150 4 VCC-1.8 30 37 15 25 -15 -5 0.4 12.5 0.8 VCC 0.5 180 40 3.8 4.3 0.5 40 120 0.4 2.0 68 193 0.6 1 10 3.5 0.4 R = 33 k R = 33 k R = 33 k R = 33 k R = 33 k, C = 4700 pF R = 33 k, C = 4700 pF 30 90 0.3 1.5 58 164 No. 6205-2/10 LB1695D Truth Table IN1 1 2 3 4 5 6 H H H L L L Input IN2 L L H H H L IN3 H L L L H H Forward/reverse control F/R L H L H L H L H L H L H Output Source -> Sink OUT2 -> OUT1 OUT1 -> OUT2 OUT3 -> OUT1 OUT1 -> OUT3 OUT3 -> OUT2 OUT2 -> OUT3 OUT1 -> OUT2 OUT2 -> OUT1 OUT1 -> OUT3 OUT3 -> OUT1 OUT2 -> OUT3 OUT3 -> OUT2 FG output FG1 FG2 L L L H H H L H L H L H F/R Forward Reverse L H 0.0 to 0.8V 4.2 to 5.0V FG output FG1 FG2 Block Diagram and Peripheral Circuitry F/R FG1 FG2 + + VCC Reg Hys.Amp 1.3V 2.3V LVSD VM VM + IN1 - + IN2 - Logic OUT1 OUT2 OUT3 + IN3 - RF Rf TSD Current Limiter 0.5V GND R C No. 6205-3/10 LB1695D Pin Description Pin name VCC R C NC OUT1 OUT2 OUT3 RF VM GND F/R IN1+, IN1- IN2+, IN2- IN3+, IN3- FG1 FG2 Pin number 1 2 3 4, 9 5 6 7 8 10 11 12 17, 18 15, 16 13, 14 20 19 Function Power supply pin for blocks except output C pin charge/discharge current set pin Setting pin for current limiter output off time and output current ignore time May be used for wiring Output pin 1 Output pin 2 Output pin 3 Output current detection pin. Insert a resistor (Rf) between this pin and ground. The output current will be limited to the value determined by VRF/Rf (output current limiter). Power supply pin for output Ground for blocks except output Lowest electrical potential of output transistors is voltage at RF pin. Forward/reverse control pin Hall input pin Logic High refers to IN+ > IN- Hall input pin Logic High refers to IN+ > IN- Hall input pin Logic High refers to IN+ > IN- Speed pulse output pin 1 with built-in pull-up resistor Speed pulse output pin 2 with built-in pull-up resistor Pin Assignment FG1 FG2 IN1- IN1+ IN2- IN2+ IN3- IN3+ F/R GND 20 19 18 17 16 15 14 13 12 11 LB1695D Top view 1 VCC 2 R 3 C 4 5 6 7 8 NC OUT1OUT2 OUT3 RF 9 NC 10 VM Pdmax - Ta 24 Allowable power dissipation, Pdmax - W 20 With an arbitrary large heat sink 16 12 8 8.0W 4 3 0 -20 0 20 40 Without heat sink 1.2W 60 80 100 120 Ambient temperature, Ta - C No. 6205-4/10 LB1695D Pin Equivalent Circuit Pin number 3 2 Pin name C R Pin voltage Equivalent circuit Vcc 2.0V 3 2 200 x4 Vcc 2.0V 0.4V 200 5 6 7 8 10 OUT1 OUT2 OUT3 RF VM Vcc 10 567 0.5V 200 8 12 F/R 0.0V min VCC max Vcc 10 k 10 k 10 k 20 k 12 Continued on next page No. 6205-5/10 LB1695D Continued from preceding page Pin number 17 18 15 16 13 14 Pin name IN1+ IN1- IN2+ IN2- IN3+ IN3- Pin voltage 1.5V min VCC-1.8V max Equivalent circuit Vcc 13 15 17 200 200 14 16 18 20 19 FG1 FG2 Vcc 10k 19 20 No. 6205-6/10 LB1695D Description of the LB1695D 1. Hall input circuit The Hall input circuit is a differential amplifier with a hysteresis of 30 mV (typ.). The operating DC level must be within the common mode input voltage range (1.5V to VCC - 1.8V). To prevent noise and other adverse influences, the input level should be at least 3 times the hysteresis (120 to 160 mVp-p). If noise evaluation at the Hall input shows a problem, a noise-canceling capacitor (about 0.01 F) should be connected across the Hall input IN+ and IN- pins. 2. Protection circuits 2-1. Low voltage protection circuit When the VCC voltage falls below a certain level (VLVSD), the low voltage protection circuit cuts off the sink-side output transistors to prevent malfunction caused by a VCC voltage drop. 2-2. Thermal shutdown circuit When the junction temperature rises above a certain value (TSD), the thermal shutdown circuit cuts off the sink-side output transistors to prevent IC damage due to overheating. Design the application heat characteristics so that the protection circuit will not be triggered under normal circumstances. 3. FG output circuit The Hall input signal at IN1, IN2, and IN3 is synthesized and subject to waveform shaping before appearing at this output. The signal at FG1 has the same frequency as the Hall input, and the signal at FG2 has a frequency that is three times higher than the Hall input. 4. Forward/Reverse control circuit This IC is designed under the assumption that forward/reverse (F/R) switching will not be carried out while the motor is running. If switching is carried out while the motor is running, a feedthrough current flows in the output and a problem will be caused regarding ASO. F/R switching should be carried out while the VM power supply is off (motor is stopped). 5. VCC, VM power supply When the power supply voltage (VCC, VM) rises very quickly at power-on, a feedthrough current may flow in the output and a problem will be caused regarding ASO. The power supply rise speed should be kept below VCC/t = 0.04V/S and VM/t = 0.16V/S. For the power-up sequence, VCC should be turned on before VM. The sequence at power-down should be VM first, and then motor stop, and then VCC. With some motors, if VCC is switched off immediately after VM, while the motor is still rotating due to inertia, the VM voltage may rise and exceed the withstand voltage. 6. Power supply stabilizing capacitors If the VCC line fluctuates drastically, the low-voltage protection circuit may be activated by mistake, or other malfunctions may occur. The VCC line should therefore be stabilized by connecting a capacitor of at least several F between VCC and ground. Because a large switching current flows in the VM line, wiring inductance and other factors can lead to VM voltage fluctuations. As the GND line also fluctuates, the VM line must be stabilized by connecting a capacitor of at least several F between VM and ground, to prevent malfunction or exceeding the withstand voltage. Especially when long wiring runs (VM, VCC, GND) are used, sufficient capacitance should be provided to ensure power supply stability. Continued on next page No. 6205-7/10 LB1695D Continued from preceding page 7. Current limiter circuit The current limiter circuit cuts off the sink-side output transistors when the output current reaches a preset value (limiter value). This limits the output current peak value. For detection of output current, the RF pin is used. By connecting the resistance Rf between the RF pin and ground, the output current can be detected as a voltage. When the RF pin voltage reaches 0.5V (typ.), the current limiter is activated. This limits the output current to the value determined by 0.5/Rf. 7-1. Output off time When the current limiter circuit was triggered and has switched off the sink-side output transistors, it will turn them on again after a preset interval (power off time). By switching the output in this way, the current limiter circuit of the LB1695D reduces the likelihood of ASO problems as compared to current limiters using the non-saturation output principle. The output off time is determined by the charge time for the capacitance C connected to the C pin. When the limiter is triggered, C starts to charge, and the time required for the C voltage to reach 2V (typ.) is the output off time. When C was charged to 2V, the sink-side output is turned on again. The charge current for C is constant-current and is determined by the resistance R connected to the R pin. The C charge current ICL and the output off time toff are calculated according to the following equations. . ICL = 1.3/R (R should be between 13 k to 100 k) . . toff = C/ICL x 2.0 . . = 1.53 x R x C . 7-2. Output current ignore time While the sink-side output is turned off by the current limiter, a regenerative current flows in the upper side regenerative current absorption diode connected externally. When the output off time has elapsed and the sink-side output is turned on again, a momentary reverse current flows in the external diode (due to the reverse recovery time of the diode), which causes a limiter-value current to flow momentarily in the output. If this triggers the current limiter again, the output will be turned off, which lowers the average current and causes a reduction in motor torque for example during startup. To prevent this, the circuit is designed not to monitor the output current for a certain period after the sink-side output were turned off and on again. This is called the output current ignore time. The output current ignore time is determined by the discharge time of the capacitance C connected to the C pin. After the current limiter was triggered and C was charged to 2V, the discharge process starts. The time required to discharge to a voltage of 0.4V (typ.) is the output ignore time. The discharge current for C is constant-current and is about 3 times the charge current (ICL). Therefore the output current ignore time is about 1/3 of the output off time. The C discharge current ICH and the output current ignore time tsm are calculated according to the following equations. . ICH = 1.3/R x 3 . . tsm = C/ICH x 1.6 . . = 0.41 x R x C . Continued on next page No. 6205-8/10 LB1695D Continued from preceding page Because the current limiter circuit is slanted towards the ON time for turning the sink-side output on again, the reverse current will not be so large even if a rectifying diode (without a short reverse recovery time) is used as regenerative current absorption diode connected externally. 7-3. Output off time setting The output off time must be optimized for the type of motor that is being controlled. The output off time setting is controlled by the external resistance connected to the R pin and the external capacitance connected to the C pin. Figure 1 shows the current limiter operating waveform. (1) Short output off time setting Because the IC is designed internally to give a ratio of about 3:1 for the output off time and output current ignore time, the two values cannot be set independently. If the output off time is set to a very small value, the output current ignore time may be too short. In such a case, the external regenerative current absorption diode acts to limit current flow by its reverse current (see section 7-2). If the output off time is small, the diode reverse current will increase, which can lead to ASO problems. (2) Long output off time setting If the output off time is set to a very high value, the average current will be reduced, resulting in lower motor startup torque. Depending on the motor type, the circuit may not change from the current limiter operating state to the normal rotation state. tso tsm 2.0V C pin voltage 0.4V 0.0V RF pin voltage 0.5V 0.0V toff Figure. 1 Current limiter operating waveform Continued on next page No. 6205-9/10 LB1695D Continued from preceding page 8. Internal power dissipation calculation Pd = (VCC x ICC) + (VM x IM) - (motor coil power dissipation) 9. IC temperature rise measurement Because the chip temperature of the IC cannot be measured directly, measurement should be carried out according to one of the following procedures. 9-1. Thermocouple measurement method A thermocouple element is mounted to the IC heat dissipation fin. This measurement method is easy to implement, but it will be subject to measurement errors if the temperature is not stable. 9-2. Measurement using internal diode characteristics of IC This is the recommended measurement method. It makes use of the parasitic diode incorporated in the IC between FG1 and GND. Set FG1 to High (off) and measure the voltage VF of the parasitic diode to calculate the temperature. (Sanyo data: for IF = -1 mA, VF temperature characteristics are about -2 mV/C) Specifications of any and all SANYO 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. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or 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 products(including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining 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 permission of SANYO Electric 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 product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of June, 1999. Specifications and information herein are subject to change without notice. PS No. 6205-10/10 |
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