Ordering number : EN5802 Monolithic Digital IC LB1695M DC Fan Motor Driver Overview Package Dimensions The LB1695M is a 3-phase brushless motor driver IC that is optimal for driving the DC fan motors used in home appliances such as water heaters. unit: mm 3216A-MFP30S Allowable power dissipation, Pd max - mW [LB1695M] Glass epoxy board with a 56% wiring density (When mounted) SANYO: MFP30S Ambient temperature, Ta - °C Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Supply voltage Output current Allowable power dissipation Symbol Conditions Ratings Unit VCC 10 V VM 45 V IO 2 A 2 W Pd max When mounted on a printed circuit board (114.3 × 76.1 × 1.6 mm, glass epoxy) Operating temperature Topr –20 to +100 °C Storage temperature Tstg –55 to +150 °C Ratings Unit Allowable Operating Ranges at Ta = 25°C Parameter Operating supply voltage range Voltage slew rate at power on Symbol Conditions VCC 4.5 to 5.5 V VM 5 to 42 V ∆VCC/∆t At the point VCC = VLVSD (OFF)* Under 0.04 V/µs ∆VM/∆t At the point VM = 0 V* Under 0.16 V/µs Note: For the items marked with asterisks (*), through currents may flow in the outputs if the power supply voltage slew rate is excessive. SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN 12398HA(OT) No. 5802-1/6 LB1695M Electrical Characteristics at Ta = 25°C, VCC = 5 V, VM = 30 V Parameter Symbol Current drain ICC Output saturation voltage Ratings Conditions min typ Unit max Forward rotation 13 19 mA VO(sat)1 IO = 0.5 A VO(sink) + VO(source) 1.8 2.4 V VO(sat)2 IO = 1.0 A VO(sink) + VO(source) 2.1 2.8 V 100 µA 4 µA Output leakage current IO leak [Hall Amplifier] Input bias current IHB 1 Common-mode input voltage range VICM 1.5 Hysteresis ∆VIN 21 3.2 V 30 37 mV Input voltage low → high VSLH 5 15 25 mV Input voltage high → low VSHL –25 –15 –5 mV 0.4 V 7.5 10.0 12.5 kΩ 0.0 0.8 [FG Pin] (Speed pulse output) Output low-level voltage VFGL Pull-up resistance RFG IFG = 5 mA [Forward/Reverse Operation] Forward VFR1 Reverse VFR2 4.2 5.0 VRF 0.42 0.50 150 180 °C 40 °C V V [Current Limiter Operation] Limiter 0.60 V [Thermal Protection Circuit] Operating temperature Hysteresis TSD *1 ∆TSD *1 [Low Voltage Protection Circuit] Operating voltage VLVSD Release voltage 3.5 VLVSD(OFF) ∆VLVSD Hysteresis 0.4 3.8 4.1 V 4.3 4.5 V 0.5 0.6 V [C Pin] Charge current ICL R = 33 kΩ 30 40 50 µA Discharge current ICH R = 33 kΩ 90 120 150 µA Charge start voltage VCL R = 33 kΩ 0.3 0.4 0.5 V Charge start voltage VCH R = 33 kΩ 1.5 2.0 2.5 V Output current ignored time tsm R = 33 kΩ, C = 4700 pF 58 68 78 µs Output off time tso R = 33 kΩ, C = 4700 pF 164 193 222 µs Note: Items marked with an asterisk are design target values and are not tested. Truth Table Input IN1 IN2 Forward/reverse control Output F/R Source → sink L OUT2 → OUT1 H OUT1 → OUT2 IN3 1 H L H 2 H L L 3 H H L 4 L H L 5 L H H 6 L L H F/R L OUT3 → OUT1 H OUT1 → OUT3 L OUT3 → OUT2 H OUT2 → OUT3 L OUT1 → OUT2 H OUT2 → OUT1 L OUT1 → OUT3 H OUT3 → OUT1 L OUT2 → OUT3 H OUT3 → OUT2 FG output FG1 FG2 L L L H L L H H H L H H FG output Forward (low): 0.0 to 0.8 V Reverse (high): 4.2 to 5.0 V No. 5802-2/7 LB1695M Pin Assignment Pin Functions Pin No. Symbol Pin voltage (V) Equivalent circuit Pin function 1, 2, 14, 15, FRAME • Pins provided for heat dissipation. These pins must be electrically open. 3 VCC • Power supply for blocks other than the output block. 4 FG1 5 FG2 6 IN1– 7 IN1+ 8 IN2– 9 + IN2 10 IN3– 11 IN3+ 12 F/R 13 GND 16, 17, 29, 30 • Speed pulse output 1 A pull-up resistor is built in. • Speed pulse output 2 A pull-up resistor is built in. 1.5 V min VCC – 1.8 V max • Hall inputs. The logic high state is when IN+ > IN–. 0.0 V min VCC max • Forward reverse control • Ground for blocks other than the output block. The RF pin voltage will be the lowest potential taken on be the output transistors. Continued on next page. No. 5802-3/7 LB1695M Continued from preceding page. Pin No. Symbol Pin voltage (V) Equivalent circuit Pin function 18 VM • Power supply pin that provides the IC output. 19 RF • Output current detection. Connect the resistor Rf between this pin and ground. The output current is limited to the value set by the ratio VRF/Rf (current limiter operation). 22 OUT3 • Output 3 23 OUT2 • Output 2 24 OUT1 • Output 1 27 C • Sets the output off time during current limiter operation and the output current ignored time. 28 R • Sets the C pin charge/discharge current. Block Diagram and Peripheral Circuit Diagram No. 5802-4/7 LB1695M LB1695M Functional Description 1. Hall input circuit The Hall input circuit is a differential amplifier with a hysteresis of 30 mV (typical). The operating DC level must fall within the common-mode input voltage range (1.5 V to VCC - 1.8 V). We recommend providing inputs with a swing of at least three times the hysteresis, i.e. 120 to 160 mV p-p, to prevent noise from interfering with circuit operation. Insert capacitors in the Hall amplifier IN+ and IN– inputs if capacity is found to be problematic during noise evaluation. 2. Protection circuits • Low voltage protection circuit If the VCC voltage falls below a stipulated level (VLVSD), the sink side output transistor is turned off. This circuit prevents incorrect operation at low VCC voltages. • Thermal protection circuit If the junction temperature exceeds a stipulated temperature (TSD), the sink side output transistor is turned off. This circuit protects the IC from thermal damage. Applications must be designed so that this circuit only operates in abnormal conditions. 3. FG output circuit This circuit outputs signals that are synthesized from the IN1, IN2, and IN3 Hall amplifier input signals and to which wave shaping has been applied. FG1 has the same frequency as the Hall inputs, and FG2 has a frequency three times that of the Hall inputs. 4. Forward/reverse control circuit This IC is designed assuming that applications will not perform motor forward/reverse (F/R) control operations while the motor is turning. Through currents will flow in the output if the motor direction is switched while the motor is turning and ASO will become a problem. We recommend performing F/R control operations with the VM power supply in the off state, i.e. when the motor is stopped. 5. VCC and VM power supplies If the power supply slew rate at power on is excessive, through currents will flow in the output and ASO will become a problem. The power supply slew rates must not exceed ∆VCC/∆t = 0.04 V/µs and ∆VM/∆t = 0.16 V/µs. Also, at power on it is desirable to bring up the VCC voltage first, and then bring up the VM voltage. At power off, it is desirable to bring down VM first, and then bring down VCC only after the motor has stopped. If VCC is turned off after VM but while the motor is still turning due to inertia, the VM voltage may rise beyond the voltage handling capacity of the IC. 6. Power supply stabilization capacitors If large fluctuation occur in the VCC line, the low-voltage protection circuit may operate incorrectly. Capacitors (with values of a few µF) must be inserted in the VCC line (between VCC and ground) to stabilize the power supply. Since large switching current flow in the VM line, fluctuations in the IC VM voltage may occur due to inductances in the wiring pattern. Capacitors must be inserted in the VM line (between VM and ground) so that incorrect operation and voltages in excess of the IC voltage handling capacity do not occur. In particular, if the application wiring lines (VM, VCC, and ground) are long, capacitors adequate to stabilize the power supply lines must be used. 7. Current limiter circuit When the output current reaches the current set as the output current (the limit value), the current limiter circuit turns off the sink side output transistor to limit the output current to the limit value. The RF pin is used to detect the output current. In particular, the output current is detected as a voltage using the Rf resistor, which is inserted between the RF pin and ground. The current limiter operates when the Rf pin reaches 0.5 V (typical) and thus the output current is limited to a value of 0.5/Rf. • Output off time After the current limiter circuit operates and limits the current by turning off the sink side output transistor, it provides a fixed off period (referred to as the output off time), after which it turns the transistor back on. As opposed to current limiter techniques that operated the output in an unsaturated state, the use of an output switching system of this type for the current limiter has the advantage that ASO during current limiter operation is less likely to be a problem. The output off time is determined by the charging time of the capacitor connected to the C pin. When the current limiter operates, the circuit starts to charge the C pin capacitor, and the output off time is the time required to charge the capacitor to a voltage of 2 V (typical). When the capacitor voltage reaches 2 V, the sink side output is turned on again. The capacitor charge current is a fixed current determined by the resistor R connected to the R pin. The C charge No. 5802-5/7 LB1695M current ICL and the output off time tOFF are related as follows: ICL ≈ 1.3/R (R must have a value in the range 13 kΩ to 100 kΩ) tOff ≈ C/ICL × 2.0 ≈ 1.53 × R × C • Output current ignored time A regenerative current flows in the external diode provided to absorb regenerative currents in the upper side of the output that was turned off while the sink side of that output is turned off by the operation of the current limiter. When the output off time has elapsed and the sink side output has been turned on again a reverse current flows instantaneously in this diode, due to the reverse recovery period of the diode. This results in a current that may reach the current limit value instantaneously. If this current were to cause the current limiter circuit to operate again, the average current produced by the IC would be reduced, and the torque produced during motor drive could be reduced. Therefore, to assure that this current is not detected, the current limiter circuit provides a period (referred to as the output current ignored time) during which the output current is not detected for a fixed period after the sink side output is turned on again after being turned off. The output current ignored time is determined by the discharge time of the capacitor C connected to the C pin. Discharge starts at the point the capacitor has been charged to 2 V after the current limiter circuit operates, and the output current ignored time is the time until the capacitor is discharged to 0.4 V (typical). The capacitor discharge current is a fixed current set to be about three times the charge current ICL. Accordingly, the output current ignored time is about 1/3 the output off time. The C discharge current ICH and the output current ignored time tsm are related as follows: ICH ≈ 1.3/R × 3 tsm ≈ C/ICH × 1.6 ≈ 0.41 × R × C Since the current limiter circuit provides a slope in the on time at the point when the sink side output is turned back on, reverse currents will not increase significantly, even if a rectifying diode (that is, a diode whose reverse recovery time is relatively long) is used as the regenerative current absorbing diode. • Output off time setting Applications must set up the output off time to be optimal for the type of motor used. (This time is set by the external resistor connected to the R pin and the external capacitor connected to the C pin.) Figure 1 shows the waveforms during current limiter operation. — If the output off time is too short: Since the ratio between the output off time and the output current ignored time is fixed at about 3:1 by IC internal circuits, it is not possible to set these parameters independently. This means that if a relatively short output off time is used, the output current ignored time may be insufficient. If the output current ignored time is insufficient, the current limiter circuit may operate due to the reverse current in the regenerative current absorption diode. (See section 7 above.) Also, if the output off time is too short, the reverse current may increase leading to ASO problems. — If the output off time is too long: Setting up a relatively long output off time can reduce the average current produced by the IC, which can result in reduced motor torque. For certain motor types, this may make it impossible to switch from the current limiter operating state to steady state operation at motor startup. No. 5802-6/7 LB1695M C pin voltage RF pin voltage Figure 1 Current Limiter Circuit Operating Waveforms 8. IC internal power dissipation calculation Pd = (VCC × ICC) + (VM × IM) – (the power dissipated in the motor coils) 9. Techniques for measuring IC temperature increases Since it is not possible to measure the IC chip temperature directly, use one of the following techniques. • Thermocouple measurement When measuring the IC temperature using a thermocouple, attach the thermocouple to the heat sink. While this technique is simple, it suffers from large measurement errors when the thermal generation within the IC is not stable. • Measurement using IC internal diode characteristics We recommend using the parasitic diode between FG1 and ground to measure the operating temperature of this IC. To measure the temperature, set FG1 to the high (off) state, measure the VF voltage of the parasitic diode, and calculate the temperature from the temperature characteristics of the VF voltage. According to Sanyo data: IF = –1 mA, and the VF temperature characteristics are about –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: ➀ 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: ➁ 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 January, 1998. Specifications and information herein are subject to change without notice. PS No. 5802-7/7