LV8760T/LV8761V Bi-CMOS LSI Forward/Reverse H-bridge Driver Application Note http://onsemi.com Overview The LV8760T /LV8761V are an H-bridge driver that can control four operation modes (forward, reverse, brake, and standby) of a motor. The low on-resistance, zero standby current, highly efficient IC is optimal for use in driving brushed DC motors for office equipment. Function Forward/reverse H-bridge motor driver: 1 channel Built-in current limiter circuit Built-in thermal protection circuit Built-in short-circuit protection function Unusual condition warning output pin (LV8761V only) Short-circuit protection circuit selectable from latch-type or auto reset-type (LV8761V only) Typical Applications MFP (Multi Function Printer) PPC (Plain Paper Copier) LBP (Laser Beam Printer) Photo Printer Scanner Industrial Cash Machine Entertainment Pin Assignment 20 VCC OUTB 2 RNF 5 VM 6 VM 7 OUTA 8 OUTA 9 PS 10 17 IN2 16 IN1 15 REG5 34 VREF NC 4 33 NC NC 5 32 NC OUTB 6 31 NC OUTB 7 30 IN2 RNF 8 29 IN1 VM 10 18 VREF LV8760T RNF 4 35 SCP NC 3 RNF 9 19 SCP OUTB 3 36 EMM Packages are not to scale. LV8761V PGND 1 VCC 1 PGND 2 28 NC 27 REG5 VM 11 26 CP1 OUTA 12 25 CP2 OUTA 13 24 NC NC 14 23 GND 14 CP1 NC 15 22 NC 13 CP2 NC 16 21 VG PS 17 20 NC 12 VG 11 GND GND 18 19 EMOT Top view TSSOP20J (225mil) Semiconductor Components Industries, LLC, 2013 December, 2013 SSOP36J (275mil) 1/36 LV8760T/LV8761V Application Note Package Dimensions Unit: mm (typ) TOP VIEW BOTTOM VIEW 6.5 20 0.5 6.4 4.4 11 10 1 0.65 Exposed Die-Pad 0.15 0.22 (1.0) 0.08 SIDE VIEW 1.2max (0.33) SANYO : TSSOP20J(225mil) SIDE VIEW TOP VIEW BOTTOM VIEW 15.0 36 (3.5) 0.5 5.6 7.6 (4.0) 1 2 0.3 0.8 0.2 0.1 (1.5) SIDE VIEW 1.7 MAX (0.7) SANYO : SSOP36J(275mil) Caution: The package dimension is a reference value, which is not a guaranteed value. Recommended Soldering Footprint (Unit:mm) Reference symbol TSSOP20J SSOP36J (225mil) (275mil) eE 5.80 7.00 e 0.65 0.8 b3 0.32 0.42 l1 1.00 1.00 X (4.3) (4.0 Y (2.8) (3.5) 2/36 GND VCC EMOT (LV8761V only) PS REG5 VG SCP Short-circuit protection circuit Oscillation circuit LVS TSD Reference voltage circuit Charge pump CP2 EMM (LV8761V only) CP1 VM OUTA OUTB IN1 IN2 Output control logic M Current limiter circuit RNF VREF PGND LV8760T/LV8761V Application Note Block Diagram Output preamplifier stage Output preamplifier stage 3/36 LV8760T/LV8761V Application Note Selection Guide Part Number LV8760T LV8761V Short-circuit protection Latch-type Latch-type/Auto reset-type, Warning output Package TSSOP20J (225mil) with Exposed Die-Pad SSOP36J (275mil) with Exposed Die-Pad Specifications Absolute Maximum Ratings at Ta = 25C Parameter Supply voltage Symbol Unit V VCC max 6 V IO peak Output continuous current IO max Allowable power dissipation Ratings 38 Output peak current Logic input voltage Conditions VM max tw 20ms, duty 5% VIN Pd max 4 A 3 A -0.3 to VCC+0.3 V LV8760T * 3.3 W LV8761V * 3.15 W Operating temperature Topr -20 to +85 C Storage temperature Tstg -55 to +150 C * Specified circuit board: 90mm90mm1.6mm, glass epoxy 2-layer board (2S0P), with backside mounting. Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time. Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Recommended Operating Conditions at Ta 25C Parameter Supply voltage range Symbol Conditions Ratings min typ Unit max VM 9 35 3 5.5 V VREF input voltage VCC VREF V 0 V Logic input voltage VIN 0 VCC-1.8 VCC V Electrical Characteristics at Ta = 25°C, VM = 24V, VCC = 5V, VREF = 1.5V Parameter Symbol Conditions Ratings min typ Unit max General A Standby mode current drain 1 IMst PS = “L” 1 Standby mode current drain 2 ICCst PS = “L” 1 A 1.3 mA mA Operating mode current drain 1 IM PS = “H”, IN1 = “H”, with no load Operating mode current drain 2 ICC VREG PS = “H”, IN1 = “H”, with no load VREG output voltage VCC low-voltage cutoff voltage Low-voltage hysteresis voltage Thermal shutdown temperature 1 3 4 4.75 5 5.25 VthVCC 2.5 2.7 2.9 V VthHIS 120 150 180 mV 155 170 185 C IO = -1mA V TSD Design guarantee * TSD Design guarantee * Ron1 Ron2 IO = 3A, sink side IO = -3A, source side IOleak VO = 35V Rising time tr 10% to 90% 200 500 ns Falling time tf 90% to 10% 200 500 ns Thermal hysteresis width C 40 Output block Output on resistance Output leakage current Input output delay time 0.2 0.25 0.32 0.40 50 A tpLH IN1 or IN2 to OUTA or OUTB (L H) 550 700 ns tpHL IN1 or IN2 to OUTA or OUTB (H L) 550 700 ns 28.7 29.8 V 250 500 s 165 kHz Charge pump block Step-up voltage VGH VM = 24V Rising time tONG VG = 0.1F Oscillation frequency Fcp 28.0 115 140 Continued on next page. 4/36 LV8760T/LV8761V Application Note Continued from preceding page Parameter Symbol Conditions Ratings min typ Unit max Control system input block Logic pin input current 1 Logic pin input current 2 IINL VIN = 0.8V adaptive pin : PS IINH IINL IINH 8 VIN = 5V adaptive pin : PS 56 80 104 A VIN = 0.8V adaptive pin : IN1, IN2 5.6 8 10.4 A VIN = 5V adaptive pin : IN1, IN2 35 50 65 A 2.0 Logic pin input H-level voltage VINH adaptive pin : PS, IN1, IN2 Logic pin input L-level voltage VINL adaptive pin : PS, IN1, IN2 10.4 A 5.6 V 0.8 V Current limiter block VREF input current IREF Current limit comparator Vthlim A -0.5 VREF = 1.5V 0.285 0.3 0.315 V A threshold voltage Short-circuit protection block SCP pin charge current Iscp Comparator threshold voltage Vthscp EMO output saturation voltage Vemo SCP = 0V Io = 500μA 3.5 5 6.5 0.8 1 1.2 V 0.3 0.4 V (LV8761V only) * Design guarantee value and no measurement is made. 5/36 1 0.8 0.6 0.4 0.2 0 ‐0.2 ‐0.4 ‐0.6 ‐0.8 ‐1 Iccst (μA) IMst (μA) LV8760T/LV8761V Application Note 5 10 15 20 25 30 1 0.8 0.6 0.4 0.2 0 ‐0.2 ‐0.4 ‐0.6 ‐0.8 ‐1 35 3 VM(V) Figure 1 Standby mode current drain1 vs VM Voltage 1.4 4 1.2 3.5 Icc (mA) IM (mA) 4.5 5 5.5 3 0.8 0.6 0.4 2.5 2 1.5 1 0.2 0.5 0 0 5 10 15 20 25 30 3 35 IREF (μA) 5.5 5.4 5.3 5.2 5.1 5 4.9 4.8 4.7 4.6 4.5 5 10 15 20 25 30 3.5 4 4.5 5 5.5 Vcc(V) Figure 4 Operating mode current drain2 vs Vcc Voltage VM(V) Figure 3 Operating mode current drain1 vs VM Voltage VREG (V) 4 Vcc(V) Figure 2 Standby mode current drain2 vs Vcc Voltage 1 0 ‐0.01 ‐0.02 ‐0.03 ‐0.04 ‐0.05 ‐0.06 ‐0.07 ‐0.08 ‐0.09 ‐0.1 3 35 3.5 4 4.5 5 5.5 4 5 Vcc(V) Figure 6 VREF input current vs Vcc Voltage VM(V) Figure 5 VREG output voltage vs VM Voltage 90 80 70 60 50 40 30 20 10 0 60 50 40 IIN (μA) IIN (μA) 3.5 30 20 10 0 0 1 2 3 VIN(V) Figure 7 Logic pin input current1 vs VIN Voltage 4 5 0 1 2 3 VIN(V) Figure 8 Logic pin input current2 vs VIN Voltage 6/36 LV8760T/LV8761V Application Note 0.4 0.6 0.5 0.3 Ron (Ω) Ron (Ω) 0.4 0.2 0.1 Ron2 0 1 2 3 0.2 Ron2 0.1 Ron1 0 0.3 Ron1 0 4 ‐20 0 Iout (A) 40 60 80 100 Temperature (℃) Figure 9 Output on Resistance vs Output Current Figure 10 Output on Resistance(Io=3A) vs Temperature 3.00 0.18 2.80 0.17 0.16 2.60 VthHIS (V) VthVcc (V) 20 2.40 2.20 2.00 0.15 0.14 0.13 0.12 ‐20 0 20 40 60 80 100 ‐20 0 Temperature (℃) 20 40 60 80 100 Temperature (℃) Figure 11 Vcc low-voltage cutoff voltage vs Temperature Figure 12 Low-voltage hysteresis voltage vs Temperature 6.5 1.20 6 1.10 Vthscp (V) Iscp (μA) 5.5 5 4.5 1.00 0.90 4 0.80 3.5 3 3.5 4 4.5 5 5.5 ‐20 0 20 40 60 80 100 Temperature (℃) Vcc(V) Figure 13 SCP pin charge current vs Vcc Voltage Figure 14 SCP Comparator threshold voltage vs Temperature 0.7 0.6 Vemo (V) 0.5 0.4 0.3 0.2 0.1 0 0 0.2 0.4 0.6 0.8 1 Io(mA) Figure 15 EMO output saturation voltage vs Output current 7/36 LV8760T/LV8761V Application Note Pin Functions Pin No. Pin LV8760T LV8761V Name Pin Function 16 29 IN1 Output control signal input pin 1. 17 30 IN2 Output control signal input pin 2 - 36 EMM Short-circuit protection circuit mode Equivalent Circuit VCC switching pin. 10kΩ 100kΩ GND 10 17 PS Power save signal input pin. VCC 50kΩ 10kΩ 10kΩ 50kΩ GND 18 34 VREF Reference voltage input pin for output VCC current limit setting. 500Ω GND 19 35 SCP Short-circuit protection circuit, detection time setting capacitor VCC connection pin. 500Ω GND 20 1 VCC Power supply connection pin for control block. Continued on next page. 8/36 LV8760T/LV8761V Application Note Continued from preceding page. Pin No. Pin LV8760T LV8761V Name Pin Function 6, 7 10,11 VM Motor power-supply connection pin. 8, 9 12,13 OUTA OUTA output pin. 4, 5 8,9 RNF Current sense resistor connection 2, 3 6,7 OUTB OUTB output pin. 1 2 PGND Power ground. 14 26 CP1 Charge pump capacitor connection 13 25 CP2 12 21 VG Equivalent Circuit pin. pin. Charge pump capacitor connection pin. Charge pump capacitor connection pin. 15 27 REG5 Internal reference voltage output pin. VM 74kΩ 2kΩ 25kΩ GND - 19 EMOT Unusual condition warning output pin. VCC 500Ω GND 11 18,23 GND Ground. 9/36 LV8760T/LV8761V Application Note DC Motor Driver Operation 1. The recommended order of power supply It is recommendable that the power supplies are turned on in the following order. VCC power supply order → VM power supply order → PS pin = High→IN1/IN2 pin control It becomes the above-mentioned opposite for power supply OFF. VCC is the controller power supply and VM is the motor power supply. Output FET is controllable safely by powering VCC first to define the state of output FET before powering VM. If VM is powered first before VCC, output FET cannot be controlled and the operation becomes unstable. However, the above-mentioned order is presented only as a recommendation, and noncompliance is not going to be the cause of over-current or IC destruction. Also, there are some other cautions to be addressed for the order of power supply. (1) When VM = 0V and VCC is powered and PS = IN1 (or IN2) = H, even if the control signal is applied to drive output FET, since the output pin is 0V, the short protector circuit detects error state and the output is latched-off. Therefore, make sure to power VCC/VM first and turn on control input (PS, IN1, IN2), then turn on the output. (2) When the PS pin is set High, the charge pump circuit operates and the VG pin voltage is boosted from the VM voltage to the VM + REG5 voltage. The charge pump output (VG) is used to drive gate of the upper FET. If the output is turned on while VG is not sufficiently boosted, the performance of the upper FET decreases, which lowers output voltage. As a result, short protector circuit may operate. Hence, make sure to secure a wait time equivalent to “tONG” or longer after PS turns High. The output latch-off caused by over current can be cancelled by applying PS signal or re-powering VCC. Figure 16. The turning on recommendation order timing chart 10/36 LV8760T/LV8761V Application Note 2. Output control logic table Control Input PS IN1 Output IN2 OUTA Mode OUTB L * * OFF OFF Standby H L L OFF OFF Output OFF H H L H L CW (Forward) H L H L H CCW (Reverse) H H H L L Brake Output waveform example (No load) Figure 17. Forward ↔ Output off switching No load, PS=High, IN2=Low Vcc=5V, VM=24V, VREF=1.5V 0.5ms/div IN1 5V/div OUTA 10V/div OUTB 10V/div 0.5μs/div 0.5μs/div IN1 5V/div Off High OUTA 10V/div IN1 5V/div High tpLH Off Low OUTA 10V/div tpHL Low Low OUTB 10V/div Standby Off Forward Forward High Off OUTB 10V/div Standby Synchronous Rectification When changing the motor rotation from Forward mode to Standby mode, IC does not turn off at once. The counterpart FET is turned on first, and then the current is attenuated rapidly. (Synchronous Rectification) Afterwards, when the zero current level is detected, the load current is prevented from being reversed by turning off the synchronous rectifier. Synchronous rectifier control reduces power dissipation during PWM operation. 11/36 LV8760T/LV8761V Application Note Figure 18. Reverse ↔ Brake switching No load, PS=High, IN2=High Vcc=5V, VM=24V, VREF=1.5V 0.5ms/div IN1 5V/div OUTA 10V/div OUTB 10V/div 0.5μs/div 0.5μs/div IN1 5V/div OUTA 10V/div Low High Low Brake OUTA 10V/div Low Low OUTB 10V/div tpHL Reverse IN1 5V/div High OUTB 10V/div tpLH Brake Reverse 12/36 LV8760T/LV8761V Application Note Output waveform example (DC motor load) Figure 19. Forward ↔ Output Off switching DC_motor load, PS=High, IN2=Low Vcc=VREF=5V, VM=24V, RNF=GND 20ms/div IN1 5V/div High OUTA 10V/div OUTB 10V/div Low Start current Off Motorcurrent 0.5A/div Forward 20ms/div 10μs/div EMF Off IN1 5V/div IN1 5V/div OUTA 10V/div OUTA 10V/div OUTB 10V/div Off High Off Low Off Synchronous Rectification ZOOM Motorcurrent 0.5A/div Forward Off OUTB 10V/div Motorcurrent 0.5A/div Forward Off DC motor starts operation, high current flows. However, as the motor rotation continues, the current is reduced due to the back electromotive force generated in the motor. Given that the motor supply voltage is Vm, the back electromotive force of the motor is EMF, and the coil resistance is Ra, the motor current is obtained as follows: Im = (Vm-EMF)/Ra 13/36 LV8760T/LV8761V Application Note Figure 20. Forward ↔ Brake switching DC_motor load, PS=High, IN1=High Vcc=VREF=5V, VM=24V, RNF=GND 20ms/div 20ms/div IN2 5V/div Low OUTA 10V/div High OUTB 10V/div Low Start current IN2 5V/div High OUTA 10V/div Low OUTB 10V/div Low Motorcurrent 0.5A/div Motorcurrent 0.5A/div Ibk Brake Forward Forward Brake You can put a brake on the DC motor by turning on both of the lower FETs of the H-Bridge while the motor is under rotation. Here, the brake current Ibk = EMF/Ra flows against, which is generated from the EMF occurred during motor rotation. Figure 21. Forward ↔ Reverse switching IN1 and IN2 are input by the reversed phase DC_motor load, PS=High Vcc=VREF=5V, VM=24V, RNF=GND IN1 5V/div High High Low Low OUTA 10V/div OUTB 10V/div IN1 5V/div High High Low Low Motorcurrent 0.5A/div Reverse Forward OUTA 10V/div OUTB 10V/div Motorcurrent 0.5A/div Forward Reverse When the counterpart FET is turned on while the DC motor is under rotation, rotation will change rapidly because the rotation direction is switched. Since Vm voltage is powered reversely in addition to the EMF, reverse current Irev = (EMF+Vm)/Ra flows against the opposite direction. Since reverse current Irev is about double the startup current, the current may exceed the ratings depends on applied loads. Hence, it is recommended to set brake mode when you switch the rotational direction of motors. 14/36 LV8760T/LV8761V Application Note 3. PWM (Pulse Width Modulation) control LV8760T/LV8761V can perform H-Bridge direct PWM control to IN1, and IN2 by inputting PWM signal. The maximum frequency of PWM signal is 200 kHz. However, dead zone is generated when On-Duty is around 0%. Make sure to select optimum PWM frequency according to the target control range. Figure22.Input‐OutputCharacteristicsofH‐Bridge(Referencedata) Forward/Reverse↔Brake Vcc=5V,VM=24V,VREF=1.5V Output voltage(V) 25 -100 20 15 10 -50 5 0 ‐5 0 ‐10 ‐15 ‐20 Measurementconnectiondiagram VM (24V) 50 100kHz 20kHz ‐25 PWM On-duty(%) Reverse 100 200kHz OUTB OUTA 240Ω Forward 1KΩ 1KΩ 10 V 8 2.2µF Output voltage(V) 6 -20 2.2µF 4 2 0 -10 ‐2 0 ‐4 ‐6 ‐8 10 20 200kHz 100kHz 20kHz ‐10 PWM On-duty(%) 15/36 LV8760T/LV8761V Application Note 4. Current Limit control Limit current Output current OUTA OUTB toff CHARGE SLOW Figure 23. Current limit control timing chart Figure 24. Output transistor operation sequence Output FET control function IN1 = High, IN2 = Low (Forward) Output control CHARGE input U1 ON U2 OFF L1 OFF L2 ON IN1 = Low, IN2 = High (Reverse) Output control CHARGE input U1 OFF U2 ON L1 ON L2 OFF BRAKE OFF OFF ON ON BRAKE OFF OFF ON ON 16/36 LV8760T/LV8761V Application Note 5. Setting the current limit value Current limit control is feasible by connecting current sensing resistor between RNF and GND and powering reference voltage to VREF. The current limit value is determined by the following formula: Ilimit [A] = (VREF [V] /5) /RNF []) Given that VREF = 1.5V, RNF = 0.22, the current limit is obtained as follows: Ilimit = 1.5V/5/0.22 = 1.36A When output current reaches to the current limit setting value, current control is performed by chopping output FET as Figure 24 shows: 1→2→3→2→1→… After the chopping drive, when the mode switches from CHARGE to Brake mode, the upper and the lower FET are turned off to prevent penetration current. The off period is set between 200 and 300nsec. During off period, the current is regenerated through parasitic diode generated between drain and source of the FET because the lower FET (L1 side) is off. 6. Setting the Braking time Braking operation time can be set by connecting a capacitor between SCP and GND pins. The value of the capacitor can be determined by the following formula: Tscp C Vthscp / Iscp [sec] Vthscp: Comparator threshold voltage (1V typical) Iscp: SCP charge current (5A typical) Timer latch-up: Tscp When a capacitor with a capacitance of 100pF is connected across the SCP and GND pins, for example, Tscp is calculated as follows: Tscp = 100pF 1V/5A = 20s This setting is the same as the following time setting required to turn off the outputs when an output short-circuit occurs as explained in the section entitled "Output Short-circuit Protection Function." 7. Blanking time If, when exercising PWM current control over the motor current, the mode is switched from decay to charge, the recovery current of the parasitic diode may flow to the current sensing resistance, causing noise to be carried on the current sensing resistance pin, and this may result in false over current detection. To prevent this false detection, a blanking time is provided to prevent the noise occurring during mode switching from being received. During this time, the mode is not switched from charge to decay even if noise is carried on the current sensing resistance pin. The blanking time, tBLANK (μs),is approximately tBLANK2μs 10μs/div 5μs/div Coilcurrent 0.5A/div Blankingtime Chargemode OUTA 10V/div OUTA 10V/div OUTB 10V/div OUTB 10V/div SCP 1V/div SCP 1V/div Brakemode Figure25.Currentlimitoperation Vcc=5V,VM=24V,VREF=1.5V RNF=0.22Ω,SCP=105pF Figure26.Blankingtime Vcc=5V,VM=24V,VREF=1.5V RNF=0.4V,SCP=105pF 17/36 LV8760T/LV8761V Application Note Output short-circuit protection function The LV8760T/LV8761V incorporates an output short-circuit protection circuit that turns off the output to prevent the IC from fatal damage when the output is short-circuited due to short-to-power or short-to-ground fault. 1. Short-circuit state detection operation VM-Output pin short High current flows as follows: VM power supply→ lower FET→ RNF resistor. When the voltage of RNF becomes high, the mode switches from Charge to Brake. However since the lower FET is on, comparison is performed to the Vds of the lower FET and short detection reference voltage. As a result, protector circuit operates and the output is turned off. Output pin-GND short High current flows as follows: The upper FET → GND After the Vds of the upper FET and short detection reference voltage is compared. As a result, protector circuit operates and the output is turned off. Output pin-Output pin short High current flows as follows: VM power supply→ the upper FET→ the lower FET→RNF resistor. When the voltage of RNF becomes high, the mode switches from Charge to Brake. Therefore, the flow of the current is stopped and short state is not detected. After the Brake mode is over, the upper FET turns on again and high current flows, but brake is set immediately. Since such operation is repeated, short state is not detected. Without use of current limit function (RNF-GND short), since the mode is not switched to brake with high current, short state is detected and the output is turned off by protector circuit. 18/36 LV8760T/LV8761V Application Note 2. Output short-circuit protection detect current Short protector operates when abnormal current flows into the output transistor. However, please note that there is a temperature property in the detection current. Ta = 25°C (typ), RNF-GND short (Reference value) Output FET LV8760T/LV8761V Upper-side FET 5A Lower-side FET 5A Figure 27. Detection Current vs Temperature (Reference data) Detection current (A) 6 5 4 3 Upper-side 2 Lower‐side 1 0 ‐20 0 20 40 60 80 100 Temperature (℃) 3. Short-circuit Protection Mode There are 2 operation modes for short protector circuit: 1. [Latch-type] latches output off state. 2. [Auto reset-type] repeats on/ off of output. LV8760T includes Latch-type only. LV8761V includes selectable Latch-type and Auto reset-type. LV8760T LV8761V Control Pin Short-circuit Protection Mode - Latch type (fix) EMM (36pin) = Low Latch type EMM (36pin) = High Auto reset type 19/36 LV8760T/LV8761V Application Note 4. Latch-type (LV8760T/LV8761V common) The short-circuit protection circuit is activated when it detects the output short-circuit state. If the short-circuit state continues for the internally preset period ( 4s), the protection circuit turns off the output from which the short-circuit state has been detected. Then it turns the output on again after a lapse of the timer latch time described later. If the short-circuit state is still detected, it changes all the outputs to the standby mode and retains the state. The latched state is released by setting the PS to L. Output ON Output ON H-bridge output state Output OFF Standby state Threshold voltage 4μs SCP voltage Short-circuit detection state Short- Release circuit Short-circuit Internal counter 1st counter start 1st counter 1st counter stop start 1st counter end 2nd counter start 2nd counter end Figure 28. Short-circuit protection Latch-type timing chart 5. How to set the SCP pin constant (timer latch-up setting) The user can set the time at which the outputs are turned off when short-circuit occurs by connecting a capacitor across the SCP and GND pins. The value of the capacitor can be determined by the following formula: Timer latch-up: Tscp Tscp C Vthscp/Iscp [sec] Vthscp: Comparator threshold voltage (1V typical) Iscp: SCP charge current (5A typical) When a capacitor with a capacitance of 100pF is connected across the SCP and GND pins, for example, Tscp is calculated as follows: Tscp = 100pF 1V/5A = 20μs 20/36 LV8760T/LV8761V Application Note 6. Auto Reset Type (LV8761V only) In LV8761V, short circuit protection mode becomes Auto reset type at EMM = high. The sequences up to the detection of an output short-circuit state are identical to those which are explained in Section 1, "Protection Function Operation (Latch Type). After output is turned off on detection of an output short-circuit condition, the internal counter starts counting and repeats turning on and off the output as shown in the figure below. This state continues until the over current state is eliminated. Exceeding the over-current detection current ON OFF Detection current sequences 2ms (TYP) ON OFF ON Output current SCP voltage Figure 29. Short-circuit protection Auto Reset type timing char 7. Unusual Condition Warning Output Pin: EMOT (LV8761V only) The LV8761V is provided with the EMOT pin which notifies the CPU of an unusual condition if the protection circuit operates by detecting an abnormal condition of the IC. This pin is of the open-drain output type and requires a pull-up resistor when to be used. The EMOT pin is placed in the ON state when one of the following conditions occurs. 1. Shorting-to-power or shorting-to-ground occurs at the output pin and the output short-circuit protection circuit is activated. 2. The IC junction temperature rises and the thermal protection circuit is activated. The EMOT pin is set to the OFF state when the relevant protection operation is eliminated. 21/36 LV8760T/LV8761V Application Note Figure30.Short‐circuitProtection(Latch‐type) OUTA‐GNDshort Vcc=5V,VM=24V,RNF=0.22Ω,SCP=105pF PS=High,IN1=High,IN2=Low 10μs/div Figure31.Short‐circuitProtection(Latch‐type) OUTB‐VMshort Vcc=5V,VM=24V,RNF=0.22Ω,SCP=105pF PS=High,IN1=High,IN2=Low 10μs/div On Off High Off Off Low Off Off EMOT (LV8761V) 5V/div High On EMOT (LV8761V) 5V/div *Low OUTA 10V/div Off Off OUTA 10V/div OUTB 10V/div Off Off OUTB 10V/div Low SCP 0.5V/div (1)(2) (3)(4) (1)OUTA‐GNDshort. (2)Short‐circuitstatedetection. Theoutputisturnedoff. (3)Theoutputisturnedonagain. (4)Theoutputoffstateislatched. WarningOutput(EMOT)isturnedon. Figure32. Short‐circuitProtection (Autoreset‐type:LV8761V) OUTA‐GNDshort Vcc=5V,VM=24V RNF=0.22Ω,SCP=105pF PS=High,IN1=High,IN2=Low 1ms/div SCP 0.5V/div (1)(2) (3)(4) (1)OUTB‐VMshort. *Thevoltageincreasesasaresult ofcurrent toRNFresistor.Consequentlythemodeshifts from charge to brake mode. Therefore, OUTA=Low. (2)Short‐circuitstatedetection. Theoutputisturnedoff. (3)Theoutputisturnedonagain. (4)Theoutputoffstateislatched. WarningOutput(EMOT)isturnedon. EMOT 5V/div OUTA 10V/div OUTB 10V/div SCP 0.5V/div 20μs/div 20μs/div EMOT 5V/div EMOT 5V/div OUTA 10V/div OUTA 10V/div OUTB 10V/div OUTB 10V/div SCP 0.5V/div SCP 0.5V/div 22/36 LV8760T/LV8761V Application Note Charge Pump Circuit When the PS pin is set High, the charge pump circuit operates and the VG pin voltage is boosted from the VM voltage to the VM + REG5 voltage. If the VG pin voltage is not boosted sufficiently, the output cannot be controlled, so be sure to provide a wait time of tONG or more after setting the PS pin High before starting to drive the motor. . Figure 33. Charge Pump circuit timing char VG voltage is used to drive upper output FET and REG5 voltage is used to drive lower output FET. Since VG voltage is equivalent to the addition of VM and REG5 voltage, VG capacitor should allow higher voltage. The capacitor between CP1 and CP2 is used to boost charge pump. Since CP1 oscillates with 0V↔REG5 and CP2 with VM↔VM+REG5, make sure to allow enough capacitance between CP1 and CP2. Since the capacitance is variable depends on motor types and driving methods, please check with your application before you define constant to avoid ripple on VG voltage. (Recommended value) VG: 0.1μF CP1-CP2: 0.1μF Figure34.ChargePumpOperation Oscillationfrequency Vcc=5V,VM=24V PS=High CP1‐CP2=0.1μF VG=0.1μF 5μs/div VG 5V/div CP2 5V/div CP1 5V/div 23/36 LV8760T/LV8761V Application Note Figure35.ChargePumpOperation tONG Vcc=5V,VM=24V PS=High CP1‐CP2=0.1μF VG=0.1μF 50μs/div PS 5V/div VM+4V VG 5V/div tONG Figure36.StartuptimewithdifferentVGcapacitor Vcc=5V,VM=24V PS=High CP1‐CP2=0.1μF VG=0.1μF/0.22μF/1μF 500μs/div PS 5V/div VG=0.1μF 5V/div VG=0.22μF 5V/div VG=1μF 5V/div tONG Thermal shutdown function The thermal shutdown circuit is incorporated and the output is turned off when junction temperature Tj exceeds 180C and the abnormal state warning output is turned on (The warning output function is only LV8761V). As the temperature falls by hysteresis, the output turned on again (automatic restoration). The thermal shutdown circuit does not guarantee the protection of the final product because it operates when the temperature exceed the junction temperature of Tjmax=150C. TSD = 170C (typ) TSD = 40C (typ) 24/36 LV8760T/LV8761V Application Note Application Circuit Example 1. When you use the current limit function <LV8760T> 35kΩ 15kΩ 0.1μF PGND VCC 20 2 OUTB SCP 19 3 OUTB VREF 18 4 RNF 10μF 5 RNF - + 6 VM 7 VM 8 OUTA CP2 13 9 OUTA VG 12 0.22Ω M Control input LV8760T 1 10 PS + - 100pF IN2 17 Control input IN1 16 REG5 15 CP1 14 0.1μF 0.1μF 0.1μF GND 11 <LV8761V> - + 1 VCC EMM 36 2 PGND SCP 35 Control input 100pF 3 NC VREF 34 4 NC NC 33 5 NC NC 32 6 OUTB NC 31 7 OUTB IN2 30 8 RNF IN1 29 Control input 10 VM - + Control input LV8761V 9 RNF M NC 28 REG5 27 11 VM CP1 26 12 OUTA CP2 25 13 OUTA NC 24 14 NC GND 23 15 NC NC 22 16 NC VG 21 17 PS NC 20 18 GND EMOT 19 Monitor Setting the current limit value When VCC = 5V, Vref = 1.5V Ilimit = Vref/5/RNF = 1.5V/5/0.22 = 1.36A Setting the current limit regeneration time and short-circuit detection time Tscp C Vthscp/Iscp = 100pF 1V/5A = 20s 25/36 LV8760T/LV8761V Application Note 2. When you do not use the current limit function <LV8760T> - + Control input PGND VCC 20 2 OUTB SCP 19 3 OUTB VREF 18 4 RNF 5 RNF 6 VM 7 VM 8 OUTA CP2 13 9 OUTA VG 12 LV8760T M 1 10 PS + - 100pF IN2 17 Control input IN1 16 REG5 15 CP1 14 GND 11 <LV8761V> - + 1 VCC EMM 36 2 PGND SCP 35 Control input 100pF 3 NC VREF 34 4 NC NC 33 5 NC NC 32 6 OUTB NC 31 7 OUTB IN2 30 8 RNF IN1 29 Control input 10 VM - + Control input LV8761V 9 RNF M NC 28 REG5 27 11 VM CP1 26 12 OUTA CP2 25 13 OUTA NC 24 14 NC GND 23 15 NC NC 22 16 NC VG 21 17 PS NC 20 18 GND EMOT 19 Monitor Setting at short-circuit state detection time Tscp C Vthscp/Iscp = 100pF·1V/5µA = 20µs *Do the following processing when you do not use the current limit function. It is short between RNF-GND. The pin VREF is hung on suitable potential of VCC or lower. 26/36 LV8760T/LV8761V Application Note 3. Stepping motor drive application <LV8760T> Note: LV8761V is similar. Setting the constant current value When VCC = 5V, Vref = 1.5V Iout = Vref/5/RNF = 1.5V/5/0.22 = 1.36A Setting at slow-decay time of constant current control and short-circuit detection time Tscp C Vthscp/Iscp = 100pF 1V/5μA = 20μs 27/36 LV8760T/LV8761V Application Note 4. Input example of Stepping motor drive application Full-step excitation control IN11 IN12 IN21 IN22 (%) 100 Iout1 0 (%)-100 100 Iout2 0 -100 Half-step excitation control IN11 IN12 IN21 IN22 (%) 100 Iout1 0 -100 (%) 100 Iout2 0 -100 28/36 LV8760T/LV8761V Application Note Allowable power dissipation The pad on the backside of the IC functions as heatsink by soldering with the board. Since the heat-sink characteristics vary depends on board type, wiring and soldering, please perform evaluation with your board for confirmation. The following Pd-Ta chart is based on the measurement result using ON semi’s evaluation board and the ICs. Pd max – Ta <LV8760T> Allowable power dissipation, Pd max – W 4.0 3.30 *1 With Exposed Die-Pad substrate *2 Without Exposed Die-Pad *1 3.0 2.0 1.60 1.72 *2 1.0 0 – 20 0.83 0 20 40 60 80 100 Ambient temperature, Ta – °C Substrate Specifications (Substrate recommended for operation of LV8760T) Size : 90mm × 90mm × 1.6mm (two-layer substrate [2S0P]) Material : Glass epoxy Copper wiring density : L1 = 95% / L2 = 95% L1 : Copper wiring pattern diagram L2 : Copper wiring pattern diagram 29/36 LV8760T/LV8761V Application Note Pd max – Ta 3.5 Allowable power dissipation, Pd max – W <LV8761V> *1 3.15 *2 2.05 3.0 2.5 2.0 1.64 1.5 1.07 1.0 0.5 *1 With Exposed Die-Pad substrate *2 Without Exposed Die-Pad 0 – 20 0 20 40 60 80 100 Ambient temperature, Ta – °C Substrate Specifications (Substrate recommended for operation of LV8761T) Size : 90mm × 90mm × 1.6mm (two-layer substrate [2S0P]) Material : Glass epoxy Copper wiring density : L1 = 95% / L2 = 95% L1 : Copper wiring pattern diagram L2 : Copper wiring pattern diagram Cautions (LV8760T/LV8761V common) 1) The data for the case with the Exposed Die-Pad substrate mounted shows the values when 90% or more of the Exposed Die-Pad is wet. 2) For the set design, employ the derating design with sufficient margin. Stresses to be derated include the voltage, current, junction temperature, power loss, and mechanical stresses such as vibration, impact, and tension. Accordingly, the design must ensure these stresses to be as low or small as possible. The guideline for ordinary derating is shown below: (1)Maximum value 80% or lower for the voltage rating (2)Maximum value 80% or lower for the current rating (3)Maximum value 80% or lower for the temperature rating 3) After the set design, be sure to verify the design with the actual product. Confirm the solder joint state and verify also the reliability of solder joint for the Exposed Die-Pad, etc. Any void or deterioration, if observed in the solder joint of these parts, causes deteriorated thermal conduction, possibly resulting in thermal destruction of IC. 30/36 LV8760T/LV8761V Application Note LV8760T’s Allowable power dissipation in each PCB size (Reference value) PCB (1) PCB (2) PCB (3) PCB (4) PCB SIZE (1) 90mm × 90mm × 1.6mm (two-layer substrate [2S0P] with backside mounting) (2) 70mm × 70mm × 1.6mm (two-layer substrate [2S0P] with backside mounting) (3) 60mm × 60mm × 1.6mm (two-layer substrate [2S0P] with backside mounting) (4) 40mm × 40mm × 1.6mm (two-layer substrate [2S0P] with backside mounting) The above chart shows the relation between Pdmax and PCB size. PCB (1) provides the reference value based on ON semi’s evaluation board of LV8760T. Above Pdmax values are obtained from the boards which are shrunk accordingly as stated above, where IC mounting position is the center. Pdmax may fluctuate depending on board layout. 31/36 LV8760T/LV8761V Application Note Evaluation board 1. Completed PCB with Devices "VCC" Power Supply C6 M R1 C5 IC1 C4 "VREF" Power Supply C3 C2 C7 C1 "VM" Power Supply SW1 SW2 SW3 Logic input 2. Bill of Materials for LV8760T and LV8761V Evaluation Board Designator C1 Quantity Description 1 Capacitor for Charge pump 1 C2 1 1 C3 1 1 C4 1 1 C5 1 1 C6 1 Capacitor for Charge pump REG5-out stabilization Capacitor VREF stabilization Capacitor Capacitor to set SCP timer VCC Bypass Capacitor 1 C7 1 R1 1 1 R2 IC1 1 1 VM Bypass Capacitor Output current detective Resistor Pull-up Resistor for pin EMOT Motor Driver 1 SW1SW3 SW1SW4 3 Switch Manufacturer Manufacturer Part Number Substitution Allowed Lead Free Adjustment product ±10% TDK FK28X7R1H104K Yes Yes LV8760T ±10% Murata GRM188R72A104KA35* Yes Yes LV8761V ±10% TDK FK28X7R1H104K Yes Yes LV8760T ±10% Murata GRM188R72A104KA35* Yes Yes LV8761V ±10% TDK FK28X7R1H104K Yes Yes LV8760T ±10% Murata GRM188R72A104KA35* Yes Yes LV8761V ±10% TDK FK28X7R1H104K Yes Yes LV8760T ±10% Murata GRM188R72A104KA35* Yes Yes LV8761V ±5% TDK FK28COG1H101J Yes Yes LV8760T ±5% Murata GRM1882C1H101JA01* Yes Yes LV8761V ±10% TDK FK28X7R1H104K Yes Yes LV8760T ±10% GRM188R72A104KA35* Yes Yes LV8761V ±5% Murata SUN Electronic Industries JAPAN RESISTOR MFG KNP2WR22J/R0 Yes Yes LV8760T ±5% ROHM MCR100JZHJLR22 Yes Yes LV8761V KOA RK73B1JT**473J Yes Yes LV8761V ON Semiconductor LV8760T No Yes LV8760T LV8761V No Yes LV8761V MS-621C-A01 Yes Yes Value Tolerance 0.1µF, 50V 0.1µF, 100V 0.1µF, 50V 0.1µF, 100V 0.1µF, 50V 0.1µF, 100V 0.1µF, 50V 0.1µF, 100V 100pF, 50V 100pF, 50V 0.1µF, 50V 0.1µF, 100V 10µF, 50V 0.22Ω, 2W 0.22Ω, 1W 47kΩ, 1/10W Footprint ±20% ±5% TSSOP20 J(225mil) SSOP36J (275mil) MIYAMA ELECTRIC 50ME10HC Yes Yes 4 TP1-TP13 13 TP1-TP15 15 LV8760T LV8761V LV8760T LV8761V Test Point MAC8 ST-1-3 Yes Yes LV8760T LV8761V 32/36 LV8760T/LV8761V Application Note 3. Evaluation board circuit <LV8760T> <LV8761V> 33/36 LV8760T/LV8761V Application Note 4. Evaluation Board Manual [Supply Voltage] VM (9 to 35V): Motor Power Supply VCC (3 to 5.5V): Control Power Supply VREF (0 to VCC-1.8V): Current Limit Control Reference Voltage [Toggle Switch State] Upper Side: High (VCC) Middle: Open, enable to external logic input Lower Side: Low (GND) [Operation Guide] 1. Initial Condition Setting: Set “Open or Low” all switches. 2. Motor Connection: Connect the Motor between OUTA and OUTB. 3. Power Supply: Supply DC voltage to VM, VCC and VREF. 4. Ready for Operation from Standby State: Turn “High” the PS pin toggle switch. 5. Motor Operation: Set IN1, IN2 and EMM (at LV8761V) pins according to the purpose (See LV8760T or LV8761V‘s logic table). [Setting for External Component Value] 1. Current limit value At VREF = 1.5V Ilimit = VREF [V]/5/R1 [ohm] = 1.5 [V] / 5 / 0.22 [ohm] = 1.36 [A] 2. Current limit regeneration time and short-circuit detection time Tscp C5 [pF] Vthscp[V]/Iscp[A] = 100[pF] 1[V]/5[A] = 20[s] 5. Evaluation board waveform (DC motor drive) Figure 37. Forward ↔ Output off DC_motor load,PS=High,IN2=Low Vcc=VREF=5V, VM=24V, RNF=GND Figure 38. Forward ↔ Brake DC_motor load,PS=High,IN1=High Vcc=VREF=5V, VM=24V, RNF=GND 200ms/div 200ms/div IN1 5V/div IN2 5V/div OUTA 10V/div OUTA 10V/div OUTB 10V/div OUTB 10V/div Motor current 0 5A/div Motor current 0 5A/div 34/36 LV8760T/LV8761V Application Note Cautions for layout: ●Power supply connection pin [VM,VCC] VCC is a control power supply, and VM is a motor power supply. Make sure that supply voltage does not exceed the absolute MAX ratings under no circumstance. Noncompliance can be the cause of IC destruction and degradation. Caution is required for VM supply voltage because this IC performs switching. The bypass capacitor of the VM power supply should be close to the IC as much as possible to stabilize voltage. Also if you intend to use high current or back EMF is high, please augment enough capacitance. ●GND pin [GND, PGND, RNF-resistor GND line, exposed die pad] High current flows into the PGND and GND side of RNF resistor; therefore, connect PGND and RNF – GND independently. On the other hand, since PGND and GND are connected through silicon board, if the line of PGND is too long, difference of electric potential occurs between PGND and GND which creates gradient to the GND electric potential within the IC board. This can be the cause of the IC malfunction. Hence make sure to connect PGND and RNF – GND independently so that the pins do not share the common impedance with GND. And GND, PGND, and RNF should be single-point grounded to the low impedance GND area near the IC. Also the capacitor between VM and GND should be connected adjacent to the IC. The exposed die-pad is connected to the board frame of the IC. Therefore, do not connect it other than GND. Independent layout is preferable. If such layout is not feasible, please connect it to signal GND. Or if the area of GND and PGND is larger, you may connect the exposed die pad to the GND. (The independent connection of exposed die pad to PGND is not recommended.) ●Internal power supply regulator pin [REG5] REG5 is a reference supply of the charge pump circuit and the power supply to drive output FET (typ 5V). When VM supply is powered and PS is “High”, REG5 operates. Please connect capacitor for stabilize REG5. The recommendation value is 0.1uF. Since the voltage of REG5 fluctuates (±10%), do not use it as reference voltage that requires accuracy. ●Input pin The logic input pin incorporates pull-down resistor (100kΩ). When you set input pin to low voltage, please short it to GND because the input pin is vulnerable to noise. The input is TTL level (H: 2V or higher, L: 0.8V or lower). VREF pin is high impedance. ●OUT pin [OUTA, OUTB] During chopping operation, the output voltage becomes equivalent to VM voltage, which can be the cause of noise. Caution is required for the pattern layout of output pin. The layout should be low impedance because driving current of motor flows into the output pin. Output voltage may boost due to back EMF. Make sure that the voltage does not exceed the absolute MAX ratings under no circumstance. Noncompliance can be the cause of IC destruction and degradation. ●Current sense resistor connection pin [RNF] To perform current limit control, please connect resistor to RNF pin. To perform saturation drive (without current limit control), please connect RNF pin to GND, and connect VREF pin to VCC. If RF pin is open, then short protector circuit operates. Therefore, please connect it to resistor or GND. The motor current flows into RF – GND line. Therefore, please connect it to common GND line and low impedance line. ●NC pin NC pin is not connected to the IC. If VM line and output line are wide enough in your layout, please use NC. 35/36 LV8760T/LV8761V Application Note ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. 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