Ordering number : ENA1271 LV8105W Bi-CMOS IC Three-Phase Brushless Motor Predriver for Variable Speed Control http://onsemi.com Overview The LV8105W is a predriver IC designed for variable speed control of 3-phase brushless motors. It can be used to implement a high- and low-side output n-channel power FET drive circuit using a built-in charge pump circuit. High-efficiency drive is possible through the use of low noise PWM drive and synchronous rectifying systems. Functions Speed discriminator and PLL speed control system Built-in VCO circuit for generating the speed discriminator reference signal Speed lock detection output Hall bias switch Braking circuit (short braking) Full complement of on-chip protection circuits, including current limiter and lock protection circuits. Specifications Absolute Maximum Ratings at Ta = 25C Parameter Symbol Conditions Ratings Unit Supply voltage VCC max VCC = VG 42 V Charge pump output voltage VG max VG pin 42 V Output current IO max1 Pins UL, VL, WL -15 to 15 mA IO max2 Pins UH, VH, WH, UOUT, VOUT and WOUT -20 to 20 mA Pd max1 Independent IC 0.45 W Pd max2 Mounted on the specified board * 1.30 W Allowable power dissipation Operating temperature Topr -20 to +80 C Storage temperature Tstg -55 to +150 C * Specified board:114.3mm × 76.1mm × 1.6mm, glass epoxy board. Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. SQFP48(7X7) ORDERING INFORMATION See detailed ordering and shipping information on page 21 of this data sheet. Semiconductor Components Industries, LLC, 2013 July, 2013 82008MSPC 20080710-S00008 No.A1271-1/21 LV8105W Allowable Operating range at Ta = 25C Parameter Symbol Conditions Ratings Unit Supply voltage range VCC 16 to 28 V 5V constant voltage output current IREG 0 to -10 mA HB pin output current IHB 0 to -25 mA LD pin applied voltage VLD ILD 0 to 6 V 0 to 5 mA VFGS IFGS 0 to 6 V 0 to 5 mA LD pin output current FGS pin applied voltage FGS pin output current Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability. Electrical Characteristics at Ta 25C, VCC = 24V Parameter Symbol Supply current 1 ICC1 Supply current 2 ICC2 Conditions Ratings min typ At stop Unit max 7 8.8 mA 3 3.8 mA 5.6 6.0 V 10 50 mV 10 50 mV 5V Constant-voltage Output (VREG pin) Output voltage VREG Line regulation V (REG1) Load regulation V (REG2) IO = 5mA VCC = 16 to 28V IO = -5 to -10mA 5.2 Output block / Conditions : apply a VG voltage of 33V High level output voltage 1 VOH1 Pins UL, VL and WL VREG-0.65 VREG-0.5 VREG-0.35 V Low level output voltage 1 VOL1 VOH2 Pins UL, VL and WL 0.35 0.5 0.65 V VG-0.65 VG-0.5 VG-0.35 V 0.45 0.6 0.8 V 51 64 77 kHz 1.65 2.05 2.45 MHz VCC+8.0 VCC+9.0 VCC+10.0 V VCC-1.35 0.5 VCC-1.0 VCC-0.7 0.8 V 0.65 102 128 154 -2 -0.1 High level output voltage 2 Low level output voltage 2 PWM frequency VOL2 f (PWM) IOH = -2mA IOL = 2mA Pins UH, VH and WH IOH = -2mA Pins UH, VH and WH IOL = 2mA Internal Oscillator Oscillation frequency f (REF) Charge Pump Output (VG pin) Output voltage VGOUT CP1 pin High level output voltage VOH (CP1) ICP1 = -2mA Low level output voltage VOL (CP1) f (CP1) ICP1 = 2mA Charge pump frequency V kHz Hall Amplifier Input bias current IHB (HA) Common-mode input voltage range 1 VICM1 When using Hall elements Common-mode input voltage range 2 VICM2 At one-side input bias (Hall IC application) Hall input sensitivity SIN wave Input voltage Low High VIN (HA) VSLH Input voltage High Low VSHL Hysteresis width A 0.3 3.5 V 0 VREG V 50 mVp-p 5 13 24 mV 2 7 12 mV -12 -6 -2 mV VCC-0.8 -10 VCC-0.5 VCC-0.35 HB pin Output voltage VHBO IHB = -15mA Output leakage current IL (HB) VO = 0V V A FG Amplifier Input offset voltage VIO (FG) IB (FG) -10 10 mV Input bias current -1 1 A Reference voltage VB (FG) -5% VREG/2 5% V High level output voltage VOH (FG) IFGI = -0.1mA, No load 3.95 4.4 4.85 V Low level output voltage VOL (FG) IFGI = 0.1mA, No load 0.75 1.2 1.65 FG input sensitivity GAIN : 100 times Schmitt width of the next stage One-side hysteresis comparator 3 120 200 Operation frequency range Open-loop gain fFG = 2kHz 45 V mV 48 280 mV 3 kHz dB Continued on next page. No.A1271-2/21 LV8105W Continued from preceding page. Ratings Parameter Symbol Conditions Unit min typ max FGS output Output saturation voltage VOL (FGS) IFGS = 2mA Output leakage current IL (FGS) VO = 6V 0.2 0.4 V 10 A 3.9 V CSD oscillator High level output voltage VOH (CSD) Low level output voltage VOL (CSD) Amplitude V (CSD) External capacitor charge current ICHG1 External capacitor discharge current ICHG2 Oscillation frequency f (CSD) 2.9 3.4 1.6 2.0 2.4 V 1.15 1.4 1.65 Vp-p -13 -10 -7 A 7.5 10.5 13.5 A C = 0.047F 78 Hz Speed Discriminator output High level output voltage 1 VOH1 (D) VREG-1.25 VREG-1.0 VREG-0.75 V V Low level output voltage 1 VOL1 (D) 0.65 0.9 1.15 High level output voltage 2 VOH2 (D) VREG-2.0 VREG-1.7 VREG-1.4 V Low level output voltage 2 VOL2 (D) 1.3 1.6 1.9 V 0.4 V 10 A +6.25 % Counts 512 LD output Output saturation voltage VOL (LD) ILD = 2mA Output leakage current IL (LD) VO = 6V Lock range 0.2 -6.25 Speed control PLL output High level output voltage VOH (P) VREG-2.0 VREG-1.7 VREG-1.4 V Low level output voltage VOL (P) 1.3 1.6 1.9 V GDF 0.20 0.25 0.32 VRF 0.23 0.25 0.275 Current control circuit Drive gain Current limiter operation Limiter voltage V Integrator Input offset voltage VIO (INT) Input bias current IB (INT) Reference voltage VB (INT) High level output voltage VOH (INT) Low level output voltage VOL (INT) Open-loop gain -10 10 mV -1 1 A -5% VREG/2 5% V IINTI = -0.1mA, No load 3.95 4.4 4.85 V IINTI = 0.1mA, No load 0.75 1.2 1.65 45 48 fINT = 2kHz V dB VCO Oscillator (C pin) Oscillation frequency range f (C) C = 120pF, R = 24k 0.15 High level output voltage VOH (C) FIL = 2.5V 2.71 3.16 1.54 MHz 3.61 V Low level output voltage VOL (C) FIL = 2.5V 2.20 2.60 3.00 V Amplitude V (C) FIL = 2.5V 0.44 0.56 0.68 Vp-p FIL pin Output source current IOH (FIL) -15 -11 -6 A Output sink current IOL (FIL) 6 10 15 A VREG0.59 VREG0.60 VREG0.61 V RC pin Comparator voltage VRC Low-voltage protection circuit Operation voltage VLVSD 8.00 8.54 9.00 V Hysteresis width VLVSD 0.25 0.34 0.45 V 150 175 C 30 C Thermal shutdown operation Thermal shutdown operation TSD Design target value* TSD Design target value* temperature Hysteresis width Note : * These items are design target values and are not tested. Continued on next page. No.A1271-3/21 LV8105W Continued from preceding page. Ratings Parameter Symbol Conditions Unit min typ max CLK pin Input frequency fI (CLK) 3 kHz High level input voltage range VIH (CLK) 2.0 VREG V Low level input voltage range VIL (CLK) 0 1.0 V Input open voltage VIO (CLK) VREG-0.5 VREG V Hysteresis width VIS (CLK) Design target value* 0.18 0.27 0.36 V High level input current IIH (CLK) VCLK = 5V -22 -10 -3 A Low level input current IIL (CLK) VCLK = 0V -133 -93 -70 A Pull-up resistance RU (CLK) 45 60 75 k High level input voltage range VIH (S/S) 2.0 VREG V Low level input voltage range VIL (S/S) 0 1.0 V Input open voltage VIO (S/S) VREG-0.5 VREG V Hysteresis width VIS (S/S) 0.18 0.27 0.36 V High level input current IIH (S/S) VS/S = 5V -22 -10 -3 A Low level input current IIL (S/S) VS/S = 0V -133 -93 -70 A Pull-up resistance RU (S/S) 45 60 75 k High level input voltage range VIH (F/R) 2.0 VREG V Low level input voltage range VIL (F/R) 0 1.0 V Input open voltage VIO (F/R) VREG-0.5 VREG V S/S pin F/R pin Hysteresis width VIS (F/R) 0.18 0.27 0.36 V High level input current IIH (F/R) VF/R = 5V -22 -10 -3 A Low level input current IIL (F/R) VF/R = 0V -133 -93 -70 A Pull-up resistance RU (F/R) 45 60 75 k High level input voltage range VIH (BR) 2.0 VREG V Low level input voltage range VIL (BR) 0 1.0 V Input open voltage VIO (BR) VREG-0.5 VREG V Hysteresis width VIS (BR) 0.18 0.27 0.36 V High level input current IIH (BR) VBR = 5V -22 -10 -3 A Low level input current IIL (BR) VBR = 0V -133 -93 -70 A Pull-up resistance RU (BR) 45 60 75 k BR pin Note : * These items are design target values and are not tested. Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. No.A1271-4/21 LV8105W Package Dimensions unit : mm (typ) SQFP48(7X7) Pd max – Ta 36 0.5 9.0 7.0 Allowable power dissipation, Pd max – W 1.5 25 24 7.0 9.0 37 48 13 1 12 0.5 0.15 0.18 Specified board : 114.3 × 76.1 × 1.6mm3 glass epoxy Mounted on a board 1.3 1.0 0.73 Independent IC 0.5 0.45 0.25 0 – 20 (0.75) 0 20 40 60 80 100 (1.5) 0.1 1.7max Ambient temperature, Ta – °C WH WOUT WL VH VOUT VL UH UOUT UL NC RF RFGND Pin Assignment 36 35 34 33 32 31 30 29 28 27 26 25 24 HB NC 37 VCC 38 23 IN3+ VG 39 22 IN3- CP2 40 21 IN2+ CP1 41 20 IN2- NC 42 19 IN1+ LV8105 VREG 43 18 IN1- GND2 44 17 FGIN+ GND1 45 16 FGIN- C 46 15 FGOUT R 47 14 LD 1 2 3 4 5 6 7 8 9 10 11 12 NC RC INTOUT INTIN INTREF DOUT POUT S/S CLK F/R BR 13 FGS CSD FIL 48 No.A1271-5/21 LV8105W Three-phase logic truth table (A high level input is the state where IN+ > IN-.) F/R = “L” F/R = “H” IN1 Drive output IN1 IN2 IN3 IN2 IN3 Upper gate Lower gate 1 H L H L H L VH UL 2 H L L L H H WH UL 3 H H L L L H WH VL 4 L H L H L H UH VL 5 L H H H L L UH WL 6 L L H H H L VH WL When F/R is “L”, the Hall input while the motor is rotating must be input in order from 1 to 6 of the above table. When the Hall input is performed by the reverse order, it will not become the soft current-carrying output. (The motor is driven by the 120 degrees current-carrying only.) Also, when F/R is “H”, the Hall input while the motor is rotating must be input in order from 6 to 1 of the above table. When the Hall input is performed by the reverse order, it will not become the soft current-carrying output. (The motor is driven by the 120 degrees current-carrying only.) S/S Input BR Input Input Mode Input Mode High or Open Stop High or Open Brake Low Start Low Release Current Control Characteristics 0.3 RF – INTOUT (typical characteristics) 0.25 GAIN = 0.25 RF – V 0.2 0.1 0 1.5 2.0 2.2 2.5 3.0 3.2 3.5 4.0 INTOUT – V No.A1271-6/21 C ±5% 24kΩ R FGIN+ 0.022μF CLK FIL 51kΩ 0.22μF ±5% 120pF 0.1μF FGIN- 510kΩ 8.2kΩ 0.082μF FGS LD FGOUT 150pF 3kΩ VREG 3kΩ VREG CLK VCO VREG VCO PLL 1/512 + SPEED DISCRI SPEED PLL VREG + FGS LD INT REF RC RC COMP 2000pF ±5% 1μF 0.047μF 0.047μF BR F/R BR F/R CONTROL AMP RST CSD CSD OSC + 51kΩ INT INT IN OUT VREG 680kΩ ±2% FG FIL 33kΩ DOUT POUT DOUT 1MΩ POUT 0.1μF DRIVE LOGIC RF CURR COMP LATCH S/S RFGND S/S 3-HALL MIX EDGES DETECT HALL FIL INT OSC 1/32 1/16 HB 110Ω WH 62Ω WOUT 62Ω WL 100Ω VH 62Ω VOUT 62Ω VL 100Ω UH UOUT UL 0.068μF VG CP2 0.01μF CP1 VREG 0.1μF 0.1μF VCC HB GND1 PRE DRIVER CHARGE PUMP VREG GND2 LVSD HALL HYS COMP 4700pF 4700pF 4700pF IN1+ IN1- IN2+ IN2- IN3+ IN3- 1kΩ 1kΩ 1kΩ 1kΩ 1kΩ 1kΩ FREQUENCY MULTIPLY 4700pF 1.8kΩ 51kΩ 680pF 51kΩ 180pF 100kΩ 680pF 180pF 100kΩ 51kΩ 180pF 100kΩ 680pF 100Ω 62Ω 62Ω 24V 0.1Ω 0.1μF 0.1μF 0.1μF FW217 × 3 0.1μF 47μF + LV8105W Block Diagram (Referance constants) No.A1271-7/21 LV8105W Relations Hall input with Drive output (1) When F/R = ”L” and the soft current-carrying output. IN1 IN2 IN3 (UH) (VH) (WH) 120 degrees Current-carrying (UL) (VL) (WL) UH VH WH Soft Current-carrying UL VL WL PWM control output Synchronous rectification output No.A1271-8/21 LV8105W (2) When F/R = ”H” and the soft current-carrying output. IN1 IN2 IN3 (UH) (VH) (WH) 120 degrees Current-carrying (UL) (VL) (WL) UH VH WH Soft Current-carrying UL VL WL PWM control output Synchronous rectification output No.A1271-9/21 LV8105W (3) When F/R = ”L” and the 120 degrees current-carrying only. IN1 IN2 IN3 UH VH WH UL VL WL PWM control output Synchronous rectification output (4) When F/R=”H” and the 120 degrees current-carrying only. IN1 IN2 IN3 UH VH WH UL VL WL PWM control output Synchronous rectification output No.A1271-10/21 LV8105W Pin Functions Pin No. Pin name 1 CSD Pin function Equivalent circuit Pin to set the operating time of the constraint Reset circuit VREG protection. Connect a capacitor between this pin and GND. This pin combines also functions as the logic circuit block initial reset pin. 500Ω 1 3 RC Pin to set the speed discriminator output amplitude switching circuit. VREG Connect a capacitor between this pin and GND. And connect a resistor between VREG and this pin. 1kΩ 4 INTOUT Integrating amplifier output pin. 3 VREG 4 105kΩ 5 INTIN Integrating amplifier inverting input pin. 500Ω VREG INTOUT 30kΩ 6 INTREF Integrating amplifier non-inverting input pin. 1/2 VREG potential. 6 500Ω 500Ω 5 Connect a capacitor between this pin and GND. 30kΩ 7 DOUT Speed discriminator output pin. Acceleration high, deceleration low. VREG 7 Continued on next page. No.A1271-11/21 LV8105W Continued from preceding page. Pin No. Pin name 8 POUT Pin function Speed control PLL output pin. Equivalent circuit VREG Outputs the phase comparison result for CLK and FG. 8 9 S/S Start / Stop control pin. VREG Low : 0V to 1.0V High : 2.0V to VREG Goes high when left open. 55kΩ Low for start. The hysteresis width is about 0.27V. 10 CLK External clock signal input pin. 5kΩ 9 VREG Low : 0V to 1.0V High : 2.0V to VREG Goes high when left open. 55kΩ The hysteresis width is about 0.27V. f = 3kHz, maximum. 11 F/R Forward / reverse control pin. 5kΩ 10 VREG Low : 0V to 1.0V High : 2.0V to VREG Goes high when left open. 55kΩ Low for forward. The hysteresis width is about 0.27V. 12 BR Brake pin (short braking operation). 5kΩ 11 VREG Low : 0V to 1.0V High : 2.0V to VREG Goes high when left open. 55kΩ High or open for brake mode operation. The hysteresis width is about 0.27V. 5kΩ 12 Continued on next page. No.A1271-12/21 LV8105W Continued from preceding page. Pin No. Pin name 13 FGS Pin function Equivalent circuit FG amplifier Schmitt output pin. VREG This is an open collector output. 13 14 LD Lock detection output pin. VREG This is an open collector output. Goes low when the motor speed is within the speed lock range (6.25%). 15 FGOUT 14 FG amplifier output pin. VREG This pin is connected to the FG Schmitt comparator circuit internally in the IC. 15 105kΩ FG Schmitt comparator 16 FGIN- FG amplifier inverting input pin. 500Ω VREG FGOUT 30kΩ 17 FGIN+ FG amplifier non-inverting input pin. 1/2 VREG potential. 17 500Ω 500Ω 16 Connect a capacitor between this pin and GND. 30kΩ IN1IN1+ IN2- Hall input pins. 22 IN2+ IN3- If noise on the Hall signals is a problem, insert capacitors between the corresponding IN+ and IN- 23 IN3+ inputs. 18 19 20 21 The input is seen as a high level input when IN+ > IN-, and as a low level input for the opposite state. VREG 18 20 22 19 21 23 Continued on next page. No.A1271-13/21 LV8105W Continued from preceding page. Pin No. Pin name 24 HB Pin function Equivalent circuit Hall bias switch pin. VCC Goes off when the S/S pin is the stop state. 24 25 RFGND Output current detection reference pin. Connect to GND side of the current detection VREG resistor Rf. 2kΩ 25 26 RF Output current detection pin. Connect to the current detection resistor Rf. VREG Sets the the maximum output current IOUT to be 0.25/Rf. 5kΩ 28 UL Output pins for gate drive of the lower side N 31 VL channel power FET. 34 WL 26 VREG 28 31 34 Continued on next page. No.A1271-14/21 LV8105W Continued from preceding page. Pin No. Pin name 30 UH Output pins for gate drive of the upper side N Pin function 33 VH channel power FET. 36 WH Equivalent circuit VG 100Ω 30 33 36 29 UOUT Pins to detect the source voltage of the upper side N 32 VOUT channel power FET. 35 WOUT 100Ω 29 32 35 38 VCC Power supply pin. Connect a capacitor between this pin and GND for stabilization. 39 VG Charge pump output pin. Connect a capacitor between this pin and VCC. VCC 400Ω 100Ω 40 CP2 Pin to connect the capacitor for charge pump. Connect a capacitor between this pin and CP1. 39 41 CP1 Pin to connect the capacitor for charge pump. Connect a capacitor between this pin and CP2. 40 VCC 41 43 VREG 5V constant voltage output pin (5.6V). Connect a capacitor between this pin and GND. VCC 43 Continued on next page. No.A1271-15/21 LV8105W Continued from preceding page. Pin No. Pin name 44 GND2 45 GND1 46 C Pin function Equivalent circuit GND pins. GND1 and GND2 are connected in the IC. VCO oscillation pin. VREG Connect a capacitor between this pin and GND. 500Ω 47 R Pin to set the charge/discharge current of the VCO 46 VREG circuit. Connect a resistor between this pin and GND. 500Ω 48 FIL VCO PLL output filter pin. VREG 48 2 NC 47 500Ω No connection pins. 27 37 42 No.A1271-16/21 LV8105W Description of LV8105W 1. Speed control circuit This IC controls the speed with a combination of the speed discriminator circuit and the PLL circuit. Therefore, when a motor that has large load variation is used, it is possible to prevent the rotation variation as compared with the speed control method only the speed discriminator. The speed discriminator circuit and the PLL circuit outputs an error signal once every one FG period. The FG servo frequency signal (fFG) is controlled to have the equal frequency with the clock signal (fCLK) which is input through the CLK pin. fFG = fCLK 2. VCO circuit This IC has the VCO circuit to generate the reference signal of the speed discriminator circuit. The reference signal frequency is calculated as follows. fVCO = fCLK 512 fVCO : Reference signal frequency, fCLK : Clock signal frequency The components connected to the R, C and FIL pins must be connected to the GND1 pin (pin 45) with a line that is as short as possible to reduce influence of noise. 3. Output drive circuit This IC adopts a direct PWM drive method to reduce power loss in the output. An external output transistor is always saturated while the transistor is on and driving force of the motor is adjusted by changing the duty that the output transistor is on. The waveform of the coil current becomes trapezoidal with the current control and the overlap switching of about 15 degrees. Therefore, it is possible to reduce the motor noise and the torque ripple when switching the phase to which power is applied (Soft current-carrying). When the 120 degrees current-carrying, the PWM switching is performed on the UL, VL and WL pins only. Also, when the soft current-carrying, the PWM switching is performed on any the outputs (the UL, VL, WL, UH, VH and WH pins). The PWM frequency is determined with 64kHz (typical) in the IC. When the PWM switching of the upper side output is off, the lower side output is turned on. Also, when the PWM switching of the lower side output is off, the upper side output is turned on (Synchronous rectification). The off-time of the synchronous rectification is determined in the IC and varies from 1.2s to 3.1s. 4. Current limiter circuit The current limiter circuit limits the (peak) current at the value I = VRF/Rf (VRF = 0.25V (typical), Rf : current detection resistor). The current limitation operation consists of reducing the PWM output on-duty to suppress the current. High accuracy detection can be achieved by connecting the RF and RFGND pins lines near at the ends of the current detection resistor (Rf). 5. Speed lock range The speed lock range is less than 6.25% of the fixes speed. When the motor speed is in the lock range, the LD pin (an open collector output) goes low. If the motor speed goes out of the lock range, the on-duty of the motor drive output is adjusted according to the speed error to control the motor speed to be within the lock range. As for the 120 degrees current-carrying and the soft current-carrying, when the motor speed goes out of the lock range, the current-carrying becomes the 120 degrees current-carrying. When the motor speed is within the lock range, the current-carrying becomes the soft current-carrying. No.A1271-17/21 LV8105W 6. Speed discriminator output amplitude switching circuit By the magnitude relation between the time t that is set by using the capacitor and resistor connected with the RC pin and the clock period which is input through the CLK pin, the output amplitude of the speed discriminator switches as follows. <High level output voltage> <Low level output voltage> When the clock period is smaller than t VREG-1.0V 0.9V When the clock period is bigger than t VREG-1.7V 1.6V When connect a resistor R between the RC pin and VREG and a capacitor C between the RC pin and GND, the above time t is calculated as follows. t = 0.91 R C By the variance of the IC, “0.91” of the above formula has varied from 0.885 to 0.935. When switching the output amplitude of the speed discriminator by the input voltage to the RC pin is performed, input that voltage to the RC pin through the resistor of 20k. The output amplitude of the speed discriminator is switched by the input voltage as follows. <High level output voltage> <Low level output voltage> Low level input (0V to 2V), VREG-1.0V 0.9V High level input (4V to 6V), VREG-1.7V 1.6V When there is no need for the speed discriminator output amplitude switching, connect the RC pin with GND. In this instance, the high level output voltage of the speed discriminator becomes VREC-1.0V and the low level output voltage of the speed discriminator becomes 0.9V. 7. Hall input signal The input amplitude of 100mVp-p or more (differential) is desirable in the Hall sensor inputs. The closer the input wave-form is to a square wave, the lower the required input amplitude. Inversely, a higher input amplitude is required the closer the input waveform is to a triangular wave. Also, note that the input DC voltage must be set to be within the common-mode input voltage range. If a Hall sensor IC is used to provide the Hall inputs, those signals can be input to one side (either the + or - side) of the Hall sensor signal inputs as 0 to VREG level signals if the other side is held fixed at a voltage within the common-mode input voltage range that applies when the Hall sensors are used. If noise on the Hall inputs is a problem, that noise must be excluded by inserting capacitors across the inputs. Those capacitors must be located as close as possible to the input pins. When the Hall inputs for all three phases are in the same state, all the outputs will be in the off state. The bias of the Hall element can be cut by supplying the bias of the Hall element from the HB pin while the S/S pin is a stop mode(Hall bias switch). The Hall input frequency range possible for the soft current-carrying is determined from 30Hz to 500Hz (IN1 frequency). 8. S/S switching circuit When the S/S pin is set to the low level, S/S switching circuit is the start mode. Inversely, when the S/S pin is set to the high level or open, S/S switching circuit is the stop mode. At the stop mode, all the outputs will be in the off state. This IC will be in the power save state of decreasing the supply current at the stop mode. 9. Braking circuit When the BR pin is set to the high level or open, the brake is on. Inversely, when the BR pin is set to the low level, the brake is released. The brake becomes a short brake that turns on the lower side output transistors for all phases (the UL, VL and WL side) and turns off the upper side output transistors for all phases (the UH, VH and WH side). Note that the current limiter does not operate during braking. During braking, the duty is set to 100%, regardless of the motor speed. The current that flows in the output transistors during braking is determined by the motor back EMF voltage and the coil resistance. Applications must be designed so that this current does not exceed the ratings of the output transistors used. (The higher the motor speed at which braking is applied, the more severe this problem becomes). The braking function can be applied and released with the IC at the start mode. This means that motor startup and stop control can be performed using the BR pin with the S/S pin held at the low level (the start mode). If the startup time becomes excessive, it can be reduced by controlling the motor startup and stop with the BR pin rather than with the S/S pin (Since the IC will be in the power save state at the stop mode, enough time for the VCO circuit to stabilize will be required at the beginning of the motor start operation). No.A1271-18/21 LV8105W 10. Forward/Reverse switching circuit The motor rotation direction can be switched by using the F/R pin. However, the following notes must be observed if the motor direction is switched while the motor is turning. • This IC is designed to avoid through currents when switching directions. However, increases in the motor supply voltage (due to instantaneous return of the motor current to the power supply) during direction switching may cause problems. The values of the capacitors inserted between power and ground must be increased if this increase is excessive. • If the motor current after direction switching exceeds the current limit value, the PWM drive side outputs will be turned off, but the opposite side output will be in the short-circuit braking state, and a current determined by the motor back EMF voltage and the coil resistance will flow. Applications must be designed so that this current does not exceed the ratings of the output transistors used. (The higher the motor speed at which the direction is switched, the more severe this problem becomes.) 11. Constraint protection circuit The LV8105W includes an on-chip constraint protection circuit to protect the motor and the output transistors in motor constraint mode. If the LD output remains high (indicating the unlocked state) for a fixed period in the motor drive state (the S/S pin : start, the BR pin : brake release), the lower side output transistors (the UL, VL and WL side) are turned off. This time can be set by adjusting the oscillation frequency of the CSD pin by using a external capacitor. By the capacitance of the capacitor attached to the CSD pin, the set time is calculated as follows. The set time (sec) = 60.8 C (F) When a 0.047F capacitor is connected with the CSD pin, the set time becomes about 2.9sec. By the variance of the IC, “60.8” of the above formula has varied from 40.8 to 80.8. To restart a motor by cancelling the constraint protection function, any of the following operation is necessary. • Put the S/S pin into the start state again after the stop state (about 1ms or more). • Put the BR pin into the brake release state again after the braking state (about 1ms or more). • Turn on the power supply again after the turn off state. When the clock disconnect protection function, the thermal shutdown function and the low-voltage protection function are operating, the constraint protection function does not operate even if the motor does not rotate. The oscillation waveform of the CSD pin is used as the reference signal for some circuits in addition to the motor constraint protection circuit. Therefore, it is desirable to oscillate the CSD pin even if the constraint protection function is unnecessary. If the constraint protection circuit is not used, the oscillation of the CSD pin must be stopped by connecting a 220k resistor and a 0.01F capacitor in parallel between the CSD pin and GND. However, in that case, the clock disconnection protection circuit will no longer function. Also, the synchronous rectification does not operate in any of the following cases. • When the motor does not rotate in the motor constrained state since the motor is started up by the S/S or the BR input, the PWM switching is performed by using the current limiter circuit. But, the synchronous rectification does not operate when the oscillation of the CSD pin is stopped. The CSD pin combines also functions as the initial reset pin. The time that the CSD pin voltage is charged to about 1.25V is determined as the initial reset. At the initial reset, all the outputs will be in the off state. 12. Clock disconnection protection circuit If the clock input through the CLK pin goes to the no input state in the motor drive state (the S/S pin : start, the BR pin : brake release), the lower side output transistors (the UL, VL and WL side) are turned off. If the clock is resupplied, the clock disconnection protection function is cancelled. When the clock period is longer than about thirty-fourth part of the constraint protection set time, the clock disconnection protection circuit judges the clock input to be the no input state and this protection function will operate. 13. Thermal shutdown circuit If the junction temperature rises to the specified temperature (TSD) in the motor drive state (the S/S pin : start, the BR pin : brake release), the lower side output transistors (the UL, VL and WL side) are turned off. If the junction temperature falls to more than the hysteresis width (TSD), the thermal shutdown function is cancelled. No.A1271-19/21 LV8105W 14. Low-voltage protection circuit The LV8105W includes a low-voltage protection circuit to protect against incorrect operation when the VCC power is applied or if the power supply voltage falls below its operating level. When the VCC voltage falls under the specified voltage (VLVSD), all the outputs will be in the off state. If the VCC voltage rises to more than the hysteresis width (VLVSD), the low-voltage protection function is cancelled. 15. Power supply stabilization Since this IC is used in applications that flow the large output current, the power supply line is subject to fluctuations. Therefore, capacitors with capacitance adequate to stabilize the power supply voltage must be connected between the VCC pin and GND. If diodes are inserted in the power supply line to prevent the IC destruction due to reverse power supply connection, since this makes the power supply voltage even more subject to fluctuations, even larger capacitance will be required. 16. Ground lines The signal system GND and the output system GND must be separated, and connected to one GND at the connector. As the large current flows to the output system GND, this GND line must be made as short as possible. Output system GND : GND for Rf and VCC line capacitors Signal system GND : GND for the IC and external components 17. Integrating amplifier The integrating amplifier integrates the speed error pulses and phase error pulses and converts them to the speed command voltage. At that time it also sets the control loop gain and the frequency characteristics. External components of the integrating amplifier must be placed as close to the IC as possible to reduce influence of noise. 18. FG amplifier The FG amplifier normally makes up a filter amplifier to reject noise. Since a clamp circuit has been added at the FG amplifier output, the output amplitude is clamped at about 3.2Vp-p, even if the amplifier gain is increased. After the FG amplifier, the Schmitt comparator on one side hysteresis(200mV (typical)) is inserted. The Schmitt comparator output (FGS output) becomes high level when the FG amplifier output is lower than the FGIN+ voltage, and becomes low level when the FG amplifier output is higher to more than Schmitt width as compared with the FGIN+ voltage. Therefore, it is desirable that the amplifier gain be set so that the output amplitude is over 1.0Vp-p at the lowest controlled speed to be used. The capacitor connected between the FGIN+ pin and GND is required for bias voltage stabilization. This capacitor must be connected to the GND1 pin (pin 45) with a line that is as short as possible to reduce influence of noise. As the FG amplifier and the FGS output are operating even if the S/S pin is the stop state, it is possible to monitor the motor rotation by the FGS output. No.A1271-20/21 LV8105W ORDERING INFORMATION Device LV8105W-MPB-E Package SQFP48(7X7) (Pb-Free) LV8105W-TLM-E SQFP48(7X7) (Pb-Free) Shipping (Qty / Packing) 50 / Tray Foam 1000 / Tape & Reel ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries. SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf . SCILLC reserves the right to make changes without further notice to any products herein. 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