Ordering number : ENN7543 Monolithic digital IC LB11690, 11690H Pre-Driver IC for Brushless Motor Drive in Electric Bicycles Overview Package Dimensions The LB11690 and LB11690H are three-phase bipolar PWM drive pre-driver ICs that allow the output circuits to be implemented using only n-channel FETs. These ICs can implement, at low cost, high-efficiency drive circuits in applications that use motors that require high drive currents. These ICs include a built-in Hall sensor signal F/V conversion circuit and can provide a voltage that is proportional to motor speed for use, for example, in speedometers for electric bicycles. These ICs also support use in applications that holds the speed controlled at a constant rate as the load varies. unit: mm 10.16 16 8.6 30 15 0.25 1 (3.25) 0.95 3.0 3.95max 0.48 (1.04) 1.78 SANYO: DIP30SD (400 mil) 3235A-HSOP36 [LB11690H] 0.65 17.8 (6.2) 2.7 1 0.25 0.8 2.0 0.3 0.1 2.45max (2.25) (0.5) 10.5 (4.9) 36 7.9 • Three-phase bipolar PWM drive (high and low side n-channel FET drive) • Maximum supply voltage: 45 V • Gate drive voltage: about 10 V (high and low side n-channel FETs) • Hall sensor signal F/V conversion circuit (one-shot multivibrator output) • Synthesized three-phase Hall sensor signal output • Built-in current limiter and undervoltage protection circuits [LB11690] 27.0 0.51min Functions and Features 3196A-DIP30SD SANYO: HSOP36 (375 mil) 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 13004TN (OT) No. 7543-1/19 LB11690, 11690H Specifications Absolute Maximum Ratings at Ta = 25°C (Note: Ratings for the LB11690H are preliminary.) Parameter Symbol Conditions Ratings Unit Supply voltage 1 VCC max VCC pin 45 Supply voltage 2 VB max VB pin 60 V UL, VL, and WL pins, sink current 40 mA Output current 1-1 IO max1-1 Output current 1-2 IO max1-2 Output current 2 IO max2 V UL, VL, and WL pins, source current 30 mA UH, VH, and WH pins 20 mA V RF pin applied voltage VRF max 4 LVS pin applied voltage VLVS max 60 V V5 + 0.3 V V IN pin applied voltage VIN max IN1, IN2, and IN3 pins RES pin applied voltage VRES max V5 + 0.3 TOC pin applied voltage EI+ pin applied voltage VTOC max VEI+ max V5 + 0.3 V V5 + 0.3 V EI– pin applied voltage VEI– max V5 + 0.3 V RC pin applied voltage VRC max V5 + 0.3 V FV pin applied voltage VFV max V5 + 0.3 V HP pin applied voltage VHP max 45 V Allowable power dissipation Pd max1 Independent IC (LB11690 and LB11690H) 0.9 W Pd max2 Mounted on designated PCB: 114.3 × 76.1 × 1.6 mm, glass epoxy (LB11690H) 2.1 W Operating temperature Topr –20 to +100 °C Storage temperature Tstg –55 to +150 °C Ratings Unit Allowable Operating Ranges at Ta = 25°C Parameter Symbol Conditions Supply voltage range 1 VCC VCC pin 15 to 42 V Supply voltage range 2 VB VB pin VCC + 13 V Output current 1-1 IOUT1-1 UL, VL, and WL pins, sink current Output current 1-2 IOUT1-2 UL, VL, and WL pins, source current Output current 2-1 IOUT2-1 UH, VH, and WH pins, sink current Output current 2-2 IOUT2-2 UH, VH, and WH pins, source current 12 V constant voltage output current 5 V constant voltage output current 30 mA –25 mA 15 mA –15 mA I12REG –30 mA I5REG –30 mA HP pin applied voltage VHP 0 to 42 V HP pin output current IHP 0 to 5 mA Electrical Characteristics at Ta = 25°C, VCC = 36 V Parameter Current drain Symbol Conditions Ratings min ICC typ max 15 20 Unit mA [5 V Constant Voltage Output (V5 pin)] Output voltage V5REG 5.0 5.3 V Line regulation ∆V5REG1 VCC = 15 to 42 V 40 100 mV Load regulation ∆V5REG2 IO = –5 to –30 mA 10 30 Temperature coefficient ∆V5REG3 Design target value* Note :*Design target values and are not tested. IO = –5 mA 4.7 0 mV mV/°C Continued on next page. No. 7543-2/19 LB11690, 11690H Continued from preceding page. Parameter Symbol Conditions Ratings min typ max Unit [12 V Constant Voltage Output (V12 pin)] Output voltage V12REG 12.0 12.8 V Line regulation ∆V12REG1 VCC = 15 to 42 V 120 240 mV Load regulation ∆V12REG2 IO = –5 to –30 mA 10 30 Temperature coefficient ∆V12REG3 Design target value* IO = – 5 mA 11.2 0 mV mV/°C [Output Block] Conditions: UOUT = VOUT = WOUT = 18 V, when 48 V is applied to VB Output high level voltage 1 VOH1 UL, VL, and WL pins, IOH = –10 mA Output low level voltage 1 VOL1 UL, VL, and WL pins, IOL = 10 mA Output high level voltage 2 VOH2 UH, VH, and WH pins, IOH = –5 mA Output low level voltage 2 VOL2 UH, VH, and WH pins, IOL = 5 mA V12 – 1.2 V12 – 0.8 0.8 46.8 V 1.2 47.2 V V 18.2 18.6 V 46.0 48.0 50.5 V VCC – 1.9 VCC – 1.4 [Charge Pump Output (VB pin)] Output voltage VBOUT [CP1 Pin] Output high level voltage VOH (CP1) ICP1 = –2 mA Output low level voltage VOL (CP1) ICP1 = 2 mA 1.5 V 2.0 V [Integrating Amplifier] Input offset voltage Input bias current Common-mode input voltage range VIO (CONT) –10 +10 mV IB (CONT) –1 +1 µA VICM 0 V5 – 1.7 Output high level voltage VOH (CONT) Output low level voltage VOL (CONT) Open-loop gain ITOC = –0.2 mA V5 – 1.1 ITOC = 0.2 mA f (CONT) = 1 kHz V5 – 0.8 0.8 45 V V 1.1 51 V dB [PWM Oscillator (PWM pin)] Output high level voltage VOH (PWM) 2.75 3.0 3.25 Output low level voltage VOL (PWM) 1.0 1.2 1.3 V –35 –25 –19 µA External capacitor charge current ICHG Oscillator frequency f (PWM) Amplitude V (PWM) VPWM = 2.1 V C = 270 pF V 31 39 48 kHz 1.6 1.8 2.1 Vp-p [TOC Pin] Input voltage 1 VTOC1 Output duty: 100% 2.72 3.0 3.30 V Input voltage 2 VTOC2 Output duty: 0% 0.99 1.2 1.34 V Input voltage 1L VTOC1L Design target value*, 100% when V5 = 4.7 V 2.72 2.80 2.90 V Input voltage 2L VTOC2L Design target value*, 0% when V5 = 4.7 V 0.99 1.08 1.17 V Input voltage 1H VTOC1H Design target value*, 100% when V5 = 5.3 V 3.08 3.20 3.30 V Input voltage 2H VTOC2H Design target value*, 0% when V5 = 5.3 V 1.11 1.22 1.34 V 85 100 115 V [Current Limiter Circuit (RF pin)] Limit voltage Note :*Design target values and are not tested. VRF Continued on next page. No. 7543-3/19 LB11690, 11690H Continued from preceding page. Parameter Symbol Ratings Conditions min typ max Unit [Undervoltage Protection Circuit (LVS pin)] Operating voltage VSDL 3.6 3.8 4.0 Release voltage VSDH 4.1 4.3 4.5 V V Hysteresis ∆VSD 0.35 0.5 0.65 V [Reset Circuit (RES pin)] Reset operating voltage VRESL 1.17 1.27 1.37 V Reset release voltage VRESH 1.37 1.5 1.63 V Hysteresis ∆VRES 0.2 0.23 0.26 V 0.15 0.5 V 10 µA [HP Pin] Output saturation voltage VHPL Output leakage current IHP leak IO = 3 mA VHP = 42 V [RC Pin] Output high level voltage VOH (RC) 3.12 3.4 3.68 V Output low level voltage VOL (RC) 0.73 0.8 0.87 V Clamp voltage VCLP (RC) 1.5 V [FV Pin] Charge current ICHG1 VFV = 2.5 V Discharge current ICHG2 VFV = 1 V –420 –300 –230 µA 1.3 2.5 5.0 mA [IN1, IN2, and IN3 Pins] VIH (IN) 4.0 V5 V Input low level voltage VIL (IN) 0 2.5 V Input open voltage VIO (IN) V5 – 0.5 V5 V Hysteresis VIS (IN) 0.55 0.9 1.25 V Input high level current IIH (IN) VIN = V5 –10 0 +10 µA Input low level current IIL (IN) VIN = 0 V Pd max — Ta 1.0 [LB11690] 0.9 W, Independent IC 0.8 0.6 0.4 0.36 0.2 0 –20 0 20 40 60 80 Ambient temperature, Ta — °C 100 120 ILB01549 –500 Allowable power dissipation, Pd max — W Allowable power dissipation, Pd max — W Input high level voltage Pd max — Ta 2.4 µA [LB11690H] Mounted on designated PCB (114.3 × 76.1 × 1.6 mm, glass epoxy) 2.1 W 2.0 1.6 1.2 0.9 W, Independent IC 0.84 0.8 0.4 0 –20 0.36 0 20 40 60 80 Ambient temperature, Ta — °C 100 120 ILB01552 No. 7543-4/19 LB11690, 11690H Three-Phase Logic Truth Table IN1 IN2 IN3 High side gate Low side gate HP 1 H L H VH UL H 2 H L L WH UL L 3 H H L WH VL H 4 L H L UH VL L 5 L H H UH WL H 6 L L H VH WL L • In the state where the high side gate is VH and the low side gate is VL, the high side FET connected to the VH pin will be on and the low side FET connected to the UL pin will also be on. • Since the HP output is an open collector output, the high output level is the open state. Pin Assignments VB VCC V12 V5 LVS CP1 CP2 HP RC FV PWM TOC EI– EI+ RES 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 LB11690 1 2 GND RFGND 3 4 5 6 7 8 9 10 11 12 13 14 15 RF WL WOUT WH VL VOUT VH UL UOUT UH IN1 IN2 IN3 Top view NC VCC NC V12 V5 NC 36 35 34 33 32 31 LVS CP1 CP2 30 29 FRAME 28 HP RC FV PWM TOC EI– EI+ RES NC 27 26 25 23 22 21 20 19 12 13 14 UL UOUT UH 15 NC 16 IN1 17 IN2 18 IN3 24 LB11690H 1 VB 2 GND 3 RF GND 4 RF 5 WL 6 8 7 NC WOUT WH 9 VL FRAME 11 10 VOUT VH Top view No. 7543-5/19 LB11690, 11690H Pin Functions *: Items in parentheses refer to the LB11690H. Pin name Pin No. GND 1 (2) RFGND 2 (3) Ground sensing pin. Connect the ground side of the low-resistance resistor RF connected to the RF pin to this pin. RF 3 (4) Output current detection pin. Connect the low-resistance resistor RF between this pin and ground. The output current will be limited to a value determined by the equation IOUT = 0.1/RF. (Current limiter circuit) WL 4 (5) VL 7 (9) UL 10 (12) WOUT 5 (7) VOUT 8 (10) UOUT 11 (13) WH 6 (8) VH 9 (11) UH 12 (14) IN1 13 (16) Pin description Ground Low side n-channel power FET gate drive output High side n-channel power FET source voltage detection High side n-channel power FET gate drive output IN2 14 (17) IN3 15 (18) Hall sensor signal inputs. Insert capacitors between these pins and ground for stabilization. RES EI+ 16 (20) 17 (21) Integrating amplifier noninverting input EI– 18 (22) Integrating amplifier inverting input Reset input. Insert a resistor between this pin and the V5 pin, and a capacitor between this pin and ground. TOC 19 (23) PWM waveform comparison (integrating amplifier output) PWM 20 (24) PWM oscillator frequency setting. Insert a capacitor between this pin and ground. FV 21 (25) Hall sensor signal one-shot multi-pulse output RC 22 (26) Hall sensor signal one-shot multi-pulse amplitude setting. Insert a resistor between this pin and the V5 pin, and a capacitor between this pin and ground. Hall sensor signal three-phase synthesized output (open collector output) HP 23 (27) CP2 24 (28) CP1 25 (29) LVS 26 (30) Undervoltage protection voltage detection. To detect a voltage of 5 V or over, connect a zener diode in series to set the detection voltage. 5 V power supply (control circuit power supply). Insert a capacitor between this pin and ground. Charge pump capacitor connections. Connect a capacitor between pins CP1 and CP2. V5 27 (32) V12 28 (33) 12 V power supply (UL, VL, and WL output block power supply). Insert a capacitor between this pin and ground. VCC 29 (35) Power supply. Insert a capacitor between this pin and ground for power supply stabilization. VB 30 (1) Charge pump output (UH, VH, and WH output block power supply). Insert a capacitor between this pin and VCC. (FRAME) — The FRAME pin is connected to the IC lower surface metal frame. Both should be left electrically open during operation. (6) (15) (NC) (19) (31) These pins are not connected to the IC internally in the package, and thus may be used for wiring connections. (34) (36) No. 7543-6/19 LB11690, 11690H Pin Functions *: Items in parentheses refer to the LB11690H. Pin No. Pin Name 1 (2) GND Pin description Ground Equivalent circuit Ground V5 2 (3) RF GND Connect the ground side of the external resistor Rf to this pin. 2 V5 3 (4) RF Output current detection Connect the low-resistance resistor RF between this pin and ground. The maximum output current is determined by the equation IOUT = 0.1/RF. 3 V12 WL 7 (9) VL 10 (12) UL 5 (7) WOUT 8 (10) VOUT 11 (13) UOUT Outputs (Low side n-channel power FET gate drive outputs) The duty is controlled. 4 7 10 50 kΩ 4 (5) VB Voltage detection (High side n-channel power FET source voltage detection) 9 12 5 8 11 50 kΩ 6 6 (8) WH 9 (11) VH 12 (14) UH Outputs (High side n-channel power FET gate drive outputs) Continued on next page. No. 7543-7/19 LB11690, 11690H Continued from preceding page. Pin No. Pin Name Pin description Equivalent circuit 8 kΩ V5 13 (16) IN1 14 (17) IN2 15 (18) IN3 Hall sensor signal inputs When open, these pins go to the high level. Insert capacitors between these pins and ground for stabilization. 2 kΩ 13 14 15 10 kΩ V5 16 (20) RES 300 Ω Reset 16 LVSD V5 17 (21) EI+ Integrating amplifier noninverting input 300 Ω 300 Ω 17 18 RES 18 (22) EI– Integrating amplifier inverting input V5 19 TOC Integrating amplifier output (PWM waveform comparison) 300 Ω 40 kΩ 19 (23) Continued on next page. No. 7543-8/19 LB11690, 11690H Continued from preceding page. Pin No. Pin Name Pin description Equivalent circuit V5 PWM PWM oscillator frequency setting Insert a capacitor between this pin and ground. 300 Ω 20 7.5 kΩ 20 (24) V5 21 (25) FV 300 Ω Hall sensor signal one-shot multi-pulse output 21 V5 22 (26) RC Hall sensor signal one-shot multi-pulse amplitude setting Insert a resistor between this pin and the V5 pin, and a capacitor between this pin and ground. 300 Ω 22 V5 23 23 (27) HP Hall sensor signal three-phase synthesized output (Open collector output) Continued on next page. No. 7543-9/19 LB11690, 11690H Continued from preceding page. Pin No. Pin Name Pin description Equivalent circuit VCC 24 (28) CP2 VB 300 Ω 24 Charge pump capacitor connections Connect a capacitor between pins CP1 and CP2. VCC 25 (29) 300 Ω CP1 25 V5 LVS 46 kΩ Undervoltage protection voltage detection. To detect a voltage of 5 V or over, connect a zener diode in series to set the detection voltage. 26 18 kΩ 26 (30) VCC 27 (32) V5 Stabilized power supply output (5 V output) Insert a capacitor (about 0.1 µF) between this pin and ground for power supply stabilization. 27 Continued on next page. No. 7543-10/19 LB11690, 11690H Continued from preceding page. Pin No. Pin Name Pin description Equivalent circuit VCC 28 (33) V12 Stabilized power supply output (12 V output) Insert a capacitor (about 0.1 µF) between this pin and ground for power supply stabilization. 29 (35) VCC Power supply Insert a capacitor between this pin and ground for power supply stabilization. 30 (1) VB Charge pump output (UH, VH, and WH output block power supply) Insert a capacitor between this pin and VCC. (FRAME) The FRAME pin is connected to the IC lower surface metal frame internally. Both should be left electrically open during operation. (NC) These pins are not connected to the IC internally in the package, and thus may be used for wiring connections. (6) (15) (19) (31) (34) (36) 28 No. 7543-11/19 LB11690, 11690H LB11690/LB11690H Function Description 1. Output Drive Circuit This IC was designed assuming that n-channel FETs would be used in both the low and high side output circuits. Direct PWM drive was adopted as the drive method to minimize power loss in the outputs. The output transistors are always saturated when on, and the motor drive power is adjusted by changing the output on duty. The output PWM switching is performed on the low side output circuits connected to the UL, VL, and WL pins. Since the reverse recovery time for the diodes built into the high side (the non-PWM side) output FETs can become a problem, the devices used must be selected carefully. (If diodes with a short reverse recovery time are not used, through currents may flow at the instant the PWM side transistors turn on.) For oscillation prevention Capacitors (about 0.1 µF) must be inserted close to the output FETs for each of the three phases to prevent high-frequency To VCC oscillator due to the PCB pattern. UH pin If the FET switching speed is too fast and leads to problems, adjust the speed by inserting a series resistor in the gate line. If UOUT pin To the motor coil the low side (PWM side) FET on speed is too fast, through UL pin currents may flow. However if too large a resistance is inserted in the gate line, the gate waveform may become less sharp. To RF For through current When the PWM on duty is low, the gate voltage may be prevention insufficient. This can lead to excessive heating or even destruction of the low side FET. Even if a resistor is not inserted, a similar phenomenon may occur if the FET gate capacitance is relatively large. In such cases, the lowest duty used must be limited, taking the ASO of the switching device used into consideration. Depending on the FET devices used, through currents may flow when the PWN on duty is low. One workaround for this problem is to insert capacitors between the gate and source of the high side FETs. However, if the capacitor values are too high, switching may become too slow, resulting in excessive heating in the high side FETs. 2. Current Limiter Circuit The current limiter circuit limits the (peak) current at a current determined by the equation I = VRF/Rf (where VRF is 0.1 V (typical) and Rf is the value of the current detection resistor). The current limiter operates by reducing the output on duty, thus reducing the output current. This circuit can be operated at a precise current limit value by connecting both ends of the current detection resistor as close as possible to the RF and RFGND pins. If a current detection resistor with an extremely small value is used, the PCB pattern must be designed so that the wiring 3 kΩ RF pin resistance components for each phase are as close to identical Current detection as possible. If there are differences in the wiring resistance 1 kΩ resistor components between the phases, the current limit value will RFGND pin change each time the phase changes. This can lead to motor vibration and motor noise. While the reference voltage is set to 0.1 V to minimize power loss in the current detection resistor, it may be desirable to use RF pin a larger current detection resistor value in some applications. Current detection resistor In such cases, a resistor divided voltage must be input to the RFGND pin RF pin. If the resistor ratio shown in the figure is used, a current detection resistor about 4 times larger can be used. The current limiter circuit includes a built-in filter circuit so that the current limiter circuit does not operate incorrectly due to detecting the output diode reverse recovery current due to PWM operation. In most applications, the built-in filter circuit will function without problem. If problems due occur (if the diode reverse recovery current flows for more than 1 µs), add an external filter circuit such as a low-pass RC filter. However, be careful not to insert excessive delay, as that will delay detection by the current limiter circuit. No. 7543-12/19 LB11690, 11690H 3. PWM Oscillator Circuit The PWM frequency is determined by the capacitor C (rated in F) connected to the PWM pin. fPWM ≈ 1/(93000 × C) When a 270 pF capacitor is used, the frequency will be about 39 kHz. If the PWM frequency is too low, the motor will generate audible noise at the switching frequency, and if it is too high, the power loss will increase. A frequency in the range 20 to 50 kHz is desirable. Connect the ground side of this capacitor to a point as close as possible to the IC ground pin to minimize the influence of output noise. 4. Control Methods The output duty is determined by comparing the PWM oscillator waveform to the TOC pin voltage. When the TOC pin voltage is about 1.2 V or lower, the duty will be 0%, and when that voltage is 3.0 V or higher, the duty will be 100%. Normally, the integrating amplifier is used as a full feedback amplifier (with TOC the EI– pin and the TOC pin connected directly), and the control voltage is Control voltage input to the EI+ pin. (Here, the output duty increases as the EI+ voltage increases.) When the EI+ pin is set to the reset operating state by the RES pin, the EI pin voltage is lowered to a level close to the ground level by an IC EI– internal transistor. (This is to discharge the capacitor.) Therefore, do not EI+ connect a low-impedance power supply directly to this pin, but rather input the voltage through a resistor. Also, a pull-down resistor must be inserted between the EI+ pin and ground so that the motor does not operate when the control voltage is in the open state. If there is noise on the control voltage or if To the FV pin it is desirable to suppress rapid fluctuations in the control voltage, a noise TOC rejection capacitor must be inserted between the EI+ pin and ground. The operating voltage range can be expanded by inputting the control voltage to the EI+ pin through a resistor voltage divider as shown in the figure. Control voltage EI– A speed control circuit using the FV pin can be implemented as shown in the figure to control the motor so that a constant speed is maintained to a certain EI+ degree despite variations in the load. A resistor of 25 kΩ or larger must be used between the FV and EI+ pin. The feedback capacitor must be selected so that the TOC pin voltage is adequately stable at low speeds. 5. Charge Pump Circuit The charge pump steps up the supply voltage to generate the high side FET gate voltage. The capacitor CP connected between the CP1 and CP2 pins is used for step up, and charge is stored on the capacitor CB connected between the VB and VCC pins. The capacitances of CP and CB must have the following relationship. CB ≥ CP × 4 The CP capacitor is charged and discharged based on the PWM frequency. While increasing the capacitance of the capacitor C increases current capacity of the VB power supply, if the capacitance is too large, the charge and discharge operation may be inadequate. Note that the larger the capacitance of the capacitor VB, the more stable the VB voltage will be. However, if that capacitance is too large, the time before the VB voltage is generated when power is first applied will increase. While testing and evaluation is required to set the values of the capacitors CP and CB, use the following table as a reference for the initial values. When the VCC supply voltage is under 20 V, the VB power supply current capacity falls rapidly causing the VB voltage to fall. Care is required in application design to assure that this does not become a problem. VCC voltage 24 V 36 V CP 0.1 µF 6800 pF CB 1 µF 0.47 µF No. 7543-13/19 LB11690, 11690H 6. Hall Sensor Input Signals The outputs of the Hall sensor IC are connected to this IC's Hall sensor inputs. Since the IC includes internal pull-up resistors (about 10 kΩ) to the 5 V regulator, normally, there is no need for external pull-up resistors. If a Hall sensor IC with built-in pull-up resistors is used, no problems will occur as long as the Hall sensor IC uses a 5 V power supply. However, pull-down resistors and voltage clamping 12 V zener diodes must be added to assure that voltages over 5 V are Hall sensor IC 5V LB11690, not applied to this IC if the Hall sensor IC uses a 12 V power 11690H supply. IN The inputs are comparator inputs with a hysteresis of about 0.9 V. If noise becomes a problem, noise rejection capacitors must be inserted between the inputs and ground. If all three of the Hall input signals go to the same input state, all the outputs, both the high side and low side, will go to the off state. 7. Undervoltage Protection Circuit The undervoltage protection circuit detects the voltage applied to the LVS pin and if that voltage falls under the operating voltage (3.8 V typical), the drive outputs are all set to the off state. This circuit has hysteresis to prevent the circuit from repeatedly turning the outputs on and off when the supply voltage is close to the protection operating voltage. Therefore, the output will not recover unless the supply voltage rises to about 0.5 V above the circuit's operating voltage. Also, the RES pin voltage goes to the low level in the protection operating state. The protection operating voltage is set to be the detection level To the detected power supply for a 5 V system. The detection level can be increased by Vz inserting a zener diode in the LVS pin to level shift the detection level. (The detection voltage will then be the zener voltage (Vz) LVS pin plus 3.8 V (typical).) The LVS pin sink current during detection is about 62 µA. If it is necessary to stabilize the zener diode voltage increase and to minimize variations in the zener voltage, insert a resistor between the LVS pin and ground to increase the zener current. It is also possible to increase the detection voltage To the detected power supply without using a zener diode by using a resistor voltage divider. If the circuit in the figure is used, the detection and release R1 voltages will be as follows. LVS pin Detection voltage ≈ ((3.8 ÷ R2) + 62 µA) × (R1 + R2) R2 Release voltage ≈ ((4.3 ÷ R2) + 70 µA) × (R1 + R2) If R1 is 13 kΩ and R2 is 2.2 kΩ, the detection voltage will be about 27 V and the release voltage will be about 31 V. Note that errors in the detection voltage due to temperature and sample-to-sample variations increase as the value of the resistor R2 increases. If this protection circuit is not used, the LVS pin must not be left open (the outputs are turned off when this pin is open). Rather, a voltage at a level at which the circuit does not operate must be applied. 8. RES Circuit When power is first applied, the application must apply an initial reset to the RES pin to assure stable operation. The initial reset performs the following operations. • All the drive outputs are turned off. • The EI+ pin voltage is forced to the low level. • The FV pin voltage is forced to the low level. Normally, a resistor and a capacitor are inserted between the RES pin and the V5 pin and the RES pin and ground, respectively, to set the reset time. A resistor with a value of 2.7 kΩ or higher must be used. The time constant must be set to a value such that R × C ≥ 1 ms (if a 10 kΩ resistor is used, the capacitor must be 0.1 µF or larger). However, in cases where it is necessary to completely discharge the capacitors on the EI+ and FV pins, the reset time must be set to cover those discharge times. It is also desirable to set the reset time to be longer than the time required to stabilize the VB voltage after power is first applied. Continued on next page. No. 7543-14/19 LB11690, 11690H Continued from preceding page. To the V5 pin RES EI+ 47 kΩ RES Figure 3 RES pin EI+ pin Figure 1 To the V5 pin RES pin Thermistor Figure 2 To the control voltage (1 V to 4 V) EI+ 47 kΩ 10 kΩ To the control voltage (1 V to 4 V) To the V5 pin To the control voltage 10 kΩ The IC remains in the reset state as the RES pin voltage goes from 0 V to about 1.5 V. Since the reset circuit has a hysteresis of about 0.23 V, the IC will not return to the reset state unless the RES pin voltage falls to under 1.27 V. In addition to the initial reset, the RES pin can also be used to apply a reset when the control voltage is low as shown in figure 1. This circuit sets all the drive outputs to the off state when the control voltage reaches about 0.67 V (1.27 V - VBE). Here, the reset release voltage is about 0.9 V (0.67 V + 0.23 V). In the state when 0% duty (1.2 V or lower) is set up with just the control voltage, the circuit will function as a brake if the motor is operated in the reverse direction. Thus the circuit shown here can be useful if braking is not required during reverse rotation. If the control voltage cannot be lowered below 1 V, a circuit such as that shown in figure 3 can be used. Applications that use a thermistor to detect the temperature and prevent thermal destruction of the FETs can also be considered. The FETs can be protected by adjusting the value of the external resistor connected as shown in figure 2. Figure 4 shows how to combine this application circuit with the application circuit shown in figure 3. Figure 4 9. RC and FV Circuits The RC pin sets the pulse width (the high-level period) of the signal generated at the FV pin at each edge (both rising and falling edges) of the HP signal (the three-phase synthesized Hall signal). The pulse width is set by connecting a resistor between the RC pin and the V5 pin and a capacitor between the RC pin and ground. The pulse width, TRC, can be calculated with the following formula. To the V5 pin TRC (seconds) ≈ 1.1 × R × C The FV pin is normally smoothed with an RC circuit such as that shown in the figure. A resistor with a value of 25 kΩ or higher must be used. Choose a RC pin capacitance such that the FV voltage is smoothed adequately at low motor speeds. Normally, TRS is set to meet the following condition when the HP signal frequency at the highest motor speed is fHP (Hz). TRC (seconds) ≤ 1 ÷ (2 × fHP) FV voltage Here, the FV voltage will vary from 0 to about 5 V according to the motor speed. FV pin The FV voltage can be used for speed feedback or speedometer display by using an analog meter or level meter IC. If the FV output is not used, the RC pin must be connected to ground and the FV pin must be left open. 10. Power Supply Stabilization Since this IC uses a switching based drive technique, it can easily cause voltage fluctuations in the power supply lines. This means that capacitors fully adequate to stabilize the supply voltage must be inserted between the VCC pin and ground. If diodes are inserted in the power supply lines to prevent damage when the power supply is connected with the polarity reversed, voltage fluctuations in the power supply lines can occur even more easily. In such applications, even larger capacitors are required. No. 7543-15/19 LB11690, 11690H 11. Regulator Output Voltage Stabilization Capacitors of 0.1 µF or larger must be inserted between the V5 (5 V control circuit power supply) and V12 (12 V low side drive output circuit power supply) pins and ground. The ground sides of these capacitors must be connected to points as close as possible to an IC ground pin. VCC While each of these outputs can provide currents of up to 30 mA to external circuits, care is required since this can increase IC heating. If this V5 or Hall sensor IC power supply IC is used as the power supply for the Hall sensor IC and other circuits and V12 pin heating becomes a problem, use an external transistor as shown in the figure so that this heating load is born by that transistor. Hall Sensor Input to Drive Output Timings Hall sensor input IN1 IN2 IN3 Pre-driver output UL VL WL UH VH WH Hall sensor signal pulse output HP FV output T ≈ 1.1RC denotes a PWM output. No. 7543-16/19 Speed control PWM EI+ EI– TOC PWM OSC + – + – RES V5 One-shot multi RES FV GND RC V5 or V12 Logic LVSD HP HP V5 IN1 CP1 IN2 Hall HYS comp Hall logic Logic Charge pump CP2 IN3 5-V REG V5 RFGND CURR LIM PRI driver 12-V REG RF WL WOUT WH VL VOUT VH UL UOUT UH LVS VB VCC V12 Zener diode 36 V LB11690, 11690H Sample Application Circuit No. 7543-17/19 Speed control Thermistor PWM EI+ EI– TOC V5 PWM OSC + – + – One-shot multi RES RES FV GND RC HP V5 or V12 Logic LVSD HP V5 IN1 CP1 IN2 Hall HYS comp Hall logic Logic Charge pump CP2 IN3 5-V REG V5 RFGND CURR LIM PRI driver 12-V REG RF WL WOUT WH VL VOUT VH UL UOUT UH LVS VB VCC V12 Zener diode 36 V LB11690, 11690H Sample Application Circuit (Closed Loop Speed Control) No. 7543-18/19 LB11690, 11690H 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 January, 2004. Specifications and information herein are subject to change without notice. PS No. 7543-19/19