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| Ordering number: EN5243 Monolithic Digital IC LB1694N 3-phase Brushless Motor Driver Overview The LB1694N is a 3-phase brushless motor driver IC that is ideal for driving DC fan motors in air conditioners, hot-water supply systems, and the like. Package Dimensions unit : mm 3037A-DIP20H [LB1694N] Features . 3-phase brushless motor driver. . Withstand voltage: 45 V; output current: 2.5 A. . Current limiter built in. . Low-voltage protector circuit built in. . Thermal shutdown protector built in. . Hall amplifier with hysteresis built in. . FG output function. Specifications Absolute Maximum Ratings at Ta = 25 C Parameter Maximum supply voltage Output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC max VM max IO Pd max1 Pd max2 Topr Tstg Independent IC With arbitrarily large heat sink Conditions SANYO : DIP20H Ratings 10 45 2.5 2.2 15.2 -20 to +100 -55 to +120 Unit V V A W W C C Allowable Operating Ranges at Ta = 25 C Parameter Supply voltage range Power supply voltage rise rate Symbol VCC VM VCC/ t VM/ t VCC = VLVSD(OFF) point *1 VM = 0 V point*1 Conditions Ratings 4.5 to 5.5 5 to 42 to 0.04 to 0.16 Unit V V V/s V/s *1 If the supply voltage rise rate is fast when power is applied, through current may flow to output. SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN D3095HA (II) No.5243-1/8 LB1694N Allowable power dissipation, Pd max -- W With arbitrarily large heat sink Independent IC Ambient temperature, Ta -- C Electric Characteristics at Ta = 25 C, VCC = 5 V, VM = 30 V Parameter Supply current Output saturation voltage Output leak current Hall amplifier Input bias current Common-mode input voltage range Hysteresis width Input voltage L H Input voltage H L FG pin (rate pulse output) Low level output voltage Pull-up resistance F/R operation Forward F/R operation Reverse Current limit operation limiter Thermal shutdown operation temperature Hysteresis width Reduced voltage protection operation voltage Reduced voltage protection release voltage Hysteresis width C pin charge current C pin discharge current C pin charge start voltage C pin discharge start voltage Output current neglect time Output off time Symbol ICC VOsat1 VOsat2 IO(leak) IHB VICM VIN VSLH VSHL VFGL RFG VFR1 VFR2 VRF TSD TSD VLVSD VLVSD(OFF) VLVSD ICL ICH VCL VCH tsm tso R R R R R R = = = = = = 33 33 33 33 33 33 k k k k k, C = 4700 pF k, C = 4700 pF 0.4 30 90 0.3 1.5 58 164 IFG = 5 mA 7.5 4.2 0.42 Design target Design target 3.5 120 10 0 5.0 0.5 150 30 3.8 4.3 0.5 40 120 0.4 2.0 68 193 4.1 4.5 0.6 50 150 0.5 2.5 78 222 1.5 21 5 -25 30 15 -15 Conditions Forward IO = 1 A, VO (sink) + VO (source) IO = 2 A, VO (sink) + VO (source) min typ 13 2.1 3.0 max 19 3.0 4.2 100 4 3.2 37 25 -5 0.4 12.5 0.8 0.6 Unit mA V V A A V mV mV mV V k V V V C C V V V A A V V s s 1 No.5243-2/8 LB1694N Truth Table Input IN1 1 2 3 4 5 6 H H H L L L IN2 L L H H H L IN3 H L L L H H F/R 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 L L L H H H FG2 L H L H L H F/R Forward Reverse L H 0.0 to 0.8 V 4.2 to 5.0 V FG output FG1 FG2 Pin Assignment No.5243-3/8 LB1694N Block Diagram and Peripheral Circuit Diagram No.5243-4/8 LB1694N Pin Functions Pin No. 1 2 Pin Name VCC R Pin Voltage Equivalent Circuit Diagram Pin Function Supplies power to all circuits except output block. Sets the C pin charge/discharge current. 3 C Sets the output off time and output current neglect time during current limiter operation. 5 6 7 8 OUT1 OUT2 OUT3 RF Output pin 1 Output pin 2 Output pin 3 Output current detection pin. By inserting resistor Rf between this pin and GND, the output current is detected as voltage. The output current is limited to a current value set by VRF/Rf (current limit operation). Power supply pin providing output. GND for other than output. The minimum potential of output transistor is the RF pin voltage. 0.0 V min VCC max Forward/reverse control pin. 10 11 VM GND 12 F/R 17, 18, 15, 16, 13, 14 IN1+, IN1- IN2 , IN2 + - 1.5 V min VCC-1.8 V max Hall device input pin. Logic ``H'' represents IN+ > IN-. IN3+, IN3- 19 20 FG2 FG1 Rate pulse output pin 2. Pull-up resistor built in. Rate pulse output pin 1. Pull-up resistor built in. No.5243-5/8 LB1694N 1. Hall input circuit The Hall input circuit is a differential amplifier with hysteresis (30 mV typ). The operating DC level must be within the common-mode input voltage range (1.5 V to VCC - 1.8 V). An input level that is at least three times greater than the hysteresis (from 120 to 160 mVp-p) is recommended to be independent of noise, etc. If the handling capability needs to be considered in noise evaluation, etc., connect a capacitor (about 0.01 F) between the Hall inputs IN+ and IN-. 2. Protectors 2-1. Reduced voltage protector If VCC drops below the prescribed voltage (VLVSD), the output transistor on the sink side turns off. This protector prevents malfunction which may occur when VCC is reduced. 2-2. Thermal shutdown protector If the junction temperature exceeds the prescribed temperature (TSD), the output transistor on the sink side turns off. This protector prevents the IC from being damaged by heat. Thermal design must be such that no operation is performed in other modes than abnormality. 3. FG output circuit IN1, IN2, and IN3 Hall input signals are composited and wave shaped to be output. FG1 has the same frequency as for Hall input, while FG2 3-fold as many. 4. Forward/reverse controller No forward/reverse (F/R) switching is assumed to be performed during motor running period. If F/R switching is performed during motor running period, through current flows to output and ASO needs to be considered. It is recommended that F/R switching be performed when the VM power supply is off (in motor stop mode). 5. VCC and VM power supplies If the supply voltage (VCC, VM) rise rate is fast when power is applied, through current flows to output and ASO needs to be considered. The supply voltage rise rate must be such that VCC/t = 0.04 V/s or less and VM/t = 0.16 V/s or less. The desirable order of applying power is VCC on first and then VM on. The desirable order of turning off power supply is VM off first and then VCC off after motor stop. If, after VM is turned off, VCC is turned off during motor's inertial running, some types of motors have a possibility that VM voltage rises, exceeding the withstand voltage. 6. Power supply stabilization capacitor Great fluctuations in the VCC line may cause the reduced-voltage protector, etc. to malfunction. A capacitor (several F) needs to be connected to the VCC line (between VCC and GND) for stabilization. Since a large switching current flows in the VM line, wiring inductance component, etc. fluctuates. Because there are also fluctuations in the GND line, a capacitor needs to be connected to the VM line (between VM and GND) for stabilization thus preventing malfunction and keeping the withstand voltage from being exceeded. Especially when the routing of wiring (VM, VCC, or GND) is long, be sure to connect capacitors with adequate capacity for power line stabilization. 7. Current limiter The current limiter turns off the sink side output transistor when the output current-set current value (limiter value) is reached. The output current is limited by the limit value. The RF pin is used to detect the output current. The output current is detected as voltage by connecting resistor Rf between RF pin and GND. When the RF pin voltage reaches 0.5 V (typ), the current limiter operates so that the output current is limited to the 0.5/Rf-set limiter value. No.5243-6/8 LB1694N 7-1. Output off time The current limiter is so designed that current limit function turns on to turn off the sink side output transistor and then turn on the transistor again after off period of a fixed time (output off time) has elapsed. Since the LB1694N uses this output switching method for the current limiter, it is hardly necessary to consider ASO in current limiter operated mode as compared with the output unsaturated current limited one. The output off time depends on charge time of capacitor C connected to the C pin. When the current limiter turns on, C begins charging and the output is kept off until C is charged up to 2 V (typ). When C has been charged up to 2 V, the sink side output turns on again. The C charging current is a constant-regulated current which depends on resistor R connected to the R pin. The C charging current ICL and output off time toff are calculated as follows: ICL 6 1.3/R (R must be set to be 13 k and 100 k.) toff 6 C/ICL x 2.0 6 1.53 x R x C 7-2. Output current neglect time While the current limiter turns on and the sink side output is off, the regeneration current flows through the external diode used for absorbing the regeneration current above the output that was turned off. After the output off time elapses and the sink side output is turned on again, reverse current flows momentarily through the external diode (for the diode's reverse recovery time), causing the current that reaches the limiter value to flow momentarily through the output. Because this current will cause current limiter to turn on again, turning off the output, the average current decreases, causing the torque to be decreased at motor start-up, etc. Therefore, in order to prevent this current from being detected, the current limiter is designed so that the output current is not detected for a fixed period of time after the sink side output is turned on again. This length of time is the output current neglect time. The output current neglect time is determined by the discharge time of the capacitor C connected to the C pin. When current limiter turns on and C charges to 2 V, C begins discharging, and the output current neglect time is the time it takes for C to discharge to the point where the voltage at C is 0.4 V (typ). The C discharge current is a constant current, and is set at about 3 times charge current ICL, As a result, the output current neglect time is about 1/3 of the output off time. The C discharge current ICH and the output current neglect time tsm are determined according to the following equations: ICL 6 1.3/R x 3 tsm 6 C/ICL x 1.6 6 0.41 x R x C Because there is a slope to the time at which the sink side output is turned on again, the reverse current is not very large, even if a rectifier diode (a diode in which the reverse recovery time is not short) is used as the external diode for absorbing the regeneration current in the current limiter. 7-3. Output off time setting It is necessary to set the output off time to a suitable level for the type of motor being used. (The output off time is set by the external resistors connected to the R pin, and by the external capacitor connected to the C pin.) Fig. 1 shows the current limiter operation waveform. (1) When the output off time is set short The output current neglect time is set by a circuit within the IC to about 1/3 of the output off time. Therefore, if the output off time is set to a very short length of time, the output current neglect time may not be adequate. If the output current neglect time is inadequate, the current limiter will turn on in response to reverse current from the external diode used to absorb the regeneration current. (Refer to Section 7-2.) Furthermore, if the output off time is short, the diode reverse current becomes large and ASO must be considered. No.5243-7/8 LB1694N (2) When the output off time is set long If the output off time is set to a very long length of time, the average current decreases, with the result that the torque at motor start-up drops. Depending on the type of motor, it may be impossible to shift from the current limiter operation state to the normal rotation state. C pin voltage RF pin voltage Fig. 1 Current Limiter Operation Waveform 8. Calculation of the IC's internal power dissipation Pd = (VCC x ICC) + (VM x IM) - (power dissipated by the motor coil) Measuring the increase in the IC's temperature Because the temperature of the IC chip cannot be measured directly, the temperature is normally measured using one of the following methods. 9. 9-1. Measurement using a thermocouple In order to measure the temperature by using a thermocouple, mount the thermocouple on the fin. Although this method of measurement is simple, if the rate of heat generation has not stabilized, the measurement error is great. 9-2. Measurement using the characteristics of a diode within the IC It is recommended that the parasitic diode between FG1 and GND be used to measure the temperature of the IC. Set FG1 high (the ``off'' state), measure the parasitic diode voltage VF, and calculate the temperature based on the temperature characteristics of the voltage VF. (Sanyo's data: IF = -1 mA, VF temperature characteristics: approximately -2 mV/ C) No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. 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 December, 1995. Specifications and information herein are subject to change without notice. No.5243-8/8 |
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