Ordering number : ENA1926A LV8762T Monolithic Linear IC Forward/Reverse H-bridge Driver http://onsemi.com Overview The LV8762T is an 1ch H-bridge driver that can control four operation modes (forward, reverse, brake, and standby) of a motor. The IC is optimal for use in driving brushed DC motors for office equipment. Function • Forward/reverse H-bridge motor driver: 1 channel • IOmax = 1A • Built-in current limiter • Current limit mask function • Built-in thermal shutdown circuit • Alert signal output • Single power supply • Built-in short-circuit protection function (selectable from latch-type or auto reset-type). Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Supply voltage VM max Output peak current IO peak Output continuous current Logic input voltage Conditions Ratings V tw ≤ 10ms, duty 20% 1.5 A 1.0 A ST , IN1 , IN2 , EMM -0.3 to +6 V -0.3 to +6 V IO max VIN max EMO pin input voltage VEMO Allowable power dissipation Pd max Unit 36 1.4 W Operating temperature Topr Mounted on a specified board. * -20 to +85 °C Storage temperature Tstg -55 to +150 °C * Specified circuit board : 57mm×57mm×1.6mm, glass epoxy both-type board. 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. Allowable Operating Ratings at Ta = 25°C Parameter Supply voltage range Symbol Conditions VM VREF input voltage VREF Logic input voltage VIN ST , IN1 , IN2 , EMM Ratings Unit 9 to 32 V 0 to 3 V 0 to 5.5 V ORDERING INFORMATION See detailed ordering and shipping information on page 13 of this data sheet. Semiconductor Components Industries, LLC, 2013 April, 2013 41713NK 20130117-S00002 / 20911 SY 20110131-S00005 No.A1926-1/13 LV8762T Electrical Characteristics at Ta = 25°C, VM = 24V, VREF = 1.5V Ratings Parameter Symbol Conditions Unit min typ max General Standby mode current drain Operating mode current drain REG5 output voltage IMst IM Thermal hysteresis width 100 ST = “H”, IN1 = “H”, IN2 = “L”, with no load 400 μA mA 3 5 IO = -1mA 4.5 5 5.5 V TSD Design guarantee * 150 180 200 °C ΔTSD Design guarantee * VREG Thermal shutdown temperature ST = “L” °C 40 Output block RonU IO = 1A, upper side ON resistance 0.75 0.97 Ω RonD IO = -1A, under side ON resistance 0.5 0.65 Ω Output leakage current IOleak VO = 32V 50 μA Diode forward voltage VD 1.2 1.4 V Output on resistance Rising time Falling time ID = -1A tr 10% to 90% 100 200 ns tf ns 90% to 10% 100 200 tpLH IN1 to OUTA, IN2 to OUTB (L → H) 550 750 ns tpHL IN1 to OUTA, IN2 to OUTB (H → L) 550 750 ns High VINH ST , IN1 , IN2 , EMM Low VINL Input output delay time Control system input block Logic input voltage Logic pin input current 1 IINL ST , IN1 , IN2 , EMM 2.0 5.5 V 0 0.8 V μA 4 8 12 30 50 70 IINH VIN = 0.8V VIN = 5V VREF input current IREF VREF = 1.5V -0.5 Current limit comparator Vtlim VREF = 1.5V 0.291 0.3 0.309 V -6.5 -5 -3.5 μA μA μA threshold voltage CHOP pin charge current CHOP pin threshold voltage CMK pin charge current CMK pin threshold voltage ICHOP VtCHOP ICMK VtCMK 0.8 1 1.2 V -32.5 -25 -17.5 μA 1.2 1.5 1.8 V 27.7 28.7 29.7 V 250 550 μs 125 155 kHz 0.4 V Charge pump block Step-up voltage VGH VM = 24V Rising time tONG VG = 0.1μF Oscillation frequency Fcp 90 Short-circuit protection block EMO output saturation voltage SCP pin charge current Comparator threshold voltage VEMO ISCP VtSCP IEMO = 1mA SCP = 0V -6.5 -5 -3.5 μA 0.8 1 1.2 V * Design guarantee value and no measurement is made. No.A1926-2/13 LV8762T Package Dimensions unit : mm (typ) 3260A 6.5 0.5 6.4 13 4.4 24 12 1 0.5 0.15 0.22 1.2max 0.08 (1.0) (0.5) TSSOP24(225mil) Pin Assignment 24 EMO PGND 2 23 CMK OUTB 3 22 SCP OUTB 4 21 CHOP RNF 5 20 VREF RNF 6 VM 7 VM 8 LV8762T EMM 1 19 IN2 18 IN1 17 REG5 OUTA 9 16 CP1 OUTA 10 15 CP2 NC 11 14 VG ST 12 13 GND Top view No.A1926-3/13 LV8762T Pd max - Ta Allowable power dissipation, Pd max - W 2.0 1.5 1.40 1.0 0.73 0.5 0 —20 0 20 40 60 Ambient temperature, Ta - 80 100 C Substrate Specifications (Substrate recommended for operation of LV8762T) Size : 57mm × 57mm × 1.6mm (two-layer substrate) Material : Glass epoxy both-type board L1 : Copper wiring pattern diagram L2 : Copper wiring pattern diagram Cautions 1) 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 less for the voltage rating (2)Maximum value 80% or less for the current rating (3)Maximum value 80% or less for the temperature rating 2) 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. No.A1926-4/13 LVS TSD Oscillation circuit Reference Voltage Circuit Output preamplifier stage + - SCP CHOP Short-circuit Protection Circuit Brake-Time Setting Circuit VM Output control logic OUTB EMM IN1 IN2 OUTA RNF CMK Current Limiter Mask Current Limiter Circuit Output preamplifier stage GND REG5 ST VG Charge pump CP1 CP2 M + + VREF EMO PGND LV8762T Block Diagram No.A1926-5/13 LV8762T Pin Functions Pin No. Pin Name Pin Functtion 18 IN1 Output control signal input pin 1. 19 IN2 Output control signal input pin 2. 1 EMM Short protection mode setting. Equivalent Circuit VREG5 19 18 1 GND 12 ST Standby mode setting VREG5 12 GND 9, 10 OUTA OUTA output pin. 3, 4 OUTB OUTB output pin. 7, 8 VM Motor power-supply connection pin. 5, 6 RNF Current sense resistor connection pin. PGND Power ground. 2 7 8 9 10 3 4 2 5 6 GND 14 VG Charge pump capacitor connection pin. 8 VM Motor power-supply connection pin. 16 CP1 Charge pump capacitor connection pin. 15 CP2 Charge pump capacitor connection pin. VREG5 16 8 15 14 GND Continued on next page. No.A1926-6/13 LV8762T Continued from preceding page. Pin No. 20 Pin Name VREF Pin Functtion Reference voltage input pin for output current limit setting. Equivalent Circuit VREG5 20 GND 17 REG5 Internal reference voltage output pin. VM 17 GND 24 EMO Alert signal output VREG5 24 GND 21 CHOP Capacitor connection for current limit VREG5 break time setting 22 SCP Capacitor connection for short detection time setting GND 21 22 23 CMK Capacitor connection for current limit mask setting VREG5 23 GND No.A1926-7/13 LV8762T Description of operation 1.Input Pin Function Each input terminal has the function to prevent the flow of the current from an input to a power supply. Therefore, Even if a power supply(VM) is turned off in the state that applied voltage to an input terminal, the electric current does not flow into the power supply. 1-1) Chip enable function This IC is switched between standby and operating mode by setting the ST pin. In standby mode, the IC is set to power-save mode and all logic is reset. In addition, the internal regulator circuit and charge pump circuit do not operate in standby mode. ST mode Internal regulator “L” or OPEN Standby mode standby Charge pump standby “H” Operation mode operation operation 1-2)DCM output control logic Contol Input ST IN1 Output IN2 OUTA OUTB Mode 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 1-3)Current limit control timing chart LIMIT current Output current OUTA Tchop OUTB CHARGE SLOW No.A1926-8/13 LV8762T 1-4) Setting the time of current limit brake value This IC can set the time of the current limit break by connecting the capacitor with CHOP-GND. The value of the capacitor is decided according to the following expression. brake time: TCHOP ≈ CCHOP × VtCHOP ÷ ICHOP [sec] VtCHOP:CHOP comparator threshold voltage. TYP=1.0[V] ICHOP:CHOP charge current. TYP=5[μA] ex. Cchop=50[pF] Tchop[sec] = 50[pF] × 1.0[V] ÷ 5[μA] = 10[μs] 1-5)Setting the current limit value The current limit value of the DCM driver is determined by the VREF voltage and the resistance (RNF) connected across the RNF and GND pins using the following formula : Ilimit [A] ≈ (VREF [V] ÷5) ÷RNF [Ω]) Assuming VREF = 1.5V, RNF = 1Ω, the current limit is : Ilimit = 1.5V÷5÷1Ω = 0.3A 1-6) Setting the mask of current limit CMK mask of current limit “L” no operation “H” or OPEN operation This function can be switched by CMK pin. This function can prevent the current limit from working by the motor start-up current when the current limit value is set low. 1-7) Setting the time of the mask of current limit This IC can set the time of the mask of current limit by connection the capacitor with CMK-GND. The value of the capacitor is decided according to the following expression. Time of mask:TCMK ≈ CCMK × VtCMK ÷ ICMK [sec] VtCMK:CMK comparator threshold voltage. TYP=1.0[V] ICMK:CMK charge current. TYP=25[μA] ex. CCMK=0.1[μF] TCMK[sec] = 0.1[μF] x 1.5[V] ÷ 25[μA] = 6[ms] 2.Output short-circuit protection function Thils IC incorporates an output short-circuit protection circuit.It turns the output off to prevent destruction of the IC if a problem such as an output pin being shorted to the motor power supply or ground occurs. Then short-circuit detected, alart signal is assert to EMO pin. 2-1) Output short protect mode This function can be switched by EMM pin. EMM pin is L or OPEN then latch method, H then auto-retry method. EMM Pin Method “L” or OPEN Latch “H” Auto retry No.A1926-9/13 LV8762T 2-2)Protection function operation (Latch method) 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 (≈ 2μs), 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 (TSCP) 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 ST to L. Output ON H bridge Output state Output ON Stand-by state Outout OFF Threshold voltage SCP voltage Short-circuit detection state Shortcircuit Release Short-circuit Internal counter 1st counter start 1st counter stop 1st counter start 1st counter end 2st counter start 2st counter end 2-3) Protection function operation (Auto retry method) In this mode, short-protection function try repeatedly to detecting short-circuit. The short-circuit detection circuit operates when a short output is detected as well as the latch method. The output is switched to the standby mode when the operation of the short-circuit detection circuit exceeds time (TSCP) of the timer latch, and it returns to the turning on mode again after 2ms(typ). At this time, the switching mode is repeated when is still in the overcurrent mode until the overcurrent mode is made clear. 2-4)Unusual Condition Warning Output Pin (EMO) The LV8762T is provided with the EMO 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 if abnormality is detected, the EMO output becomes (EMO=L) of on. The EMO 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. 2-5)Timer latch-up (TSCP) The user can set the time at which the outputs are turned off when a short-circuit occurs by connecting a capacitor (CSCP) across the SCP and GND pins. The value of the capacitor (CSCP) can be determined by the following formula : Timer latch-up : TSCP TSCP ≈ CSCP × VtSCP ÷ ISCP [sec] VtSCP : Comparator threshold voltage (1V typical) ISCP : SCP charge current (5μA typical) No.A1926-10/13 LV8762T 3.Thermal shutdown function The thermal shutdown circuit is included, and the output is turned off when junction temperature Tj exceeds 180°C, and the abnormal state warning output(EMO pin) is turned on at the same time. When the temperature falls hysteresis level, output is driven again (automatic restoration) The thermal shutdown circuit doesn’t guarantee protection of the set and the destruction prevention because it works at the temperature that is higher than rating (Tjmax=150°C) of the junction temperature TSD=180°C (typ) ΔTSD=40°C (typ) 4.Charge pump Circuit When the ST pin is set High, the charge pump circuit operates and the VG pin voltage is boosted from the VM voltage to the VM+VREG5 voltage. If the VG pin voltage is not boosted to VM+4V or more, the output pin cannot be turned on. Therefore it is recommended that the drive of the motor is started after the time has passed tONG or more. ST VG pin voltage VM+VREG5 VM+4V VM tONG No.A1926-11/13 LV8762T 5.Application Circuit Example Control input 1 EMM EMO 24 2 PGND CMK 23 3 OUTB SCP 22 4 OUTB CHOP 21 5 RNF VREF 20 Overcurrent detection monitor pin 0.1 F 50pF M 7 VM - + Control input 8 VM LV8762T 6 RNF 50pF Output current setting input IN2 19 Control input IN1 18 REG5 17 9 OUTA CP1 16 10 OUTA CP2 15 11 NC VG 14 12 ST GND 13 Current limit value When VREF = 1.5V, Ilimit = Vref ÷ 5 ÷ RNF = 1.5V ÷ 5 ÷ 1Ω = 0.3A Setting the current limit regeneration time and short-circuit detection time TSCP ≈ CSCP × VtSCP ÷ ISCP = 50pF × 1V ÷ 5μA = 10μs Setting at current limit mask time TCMK ≈ CCMK × VtCMK ÷ ICMK = 0.1μF × 1.5V ÷ 25μA = 6ms Setting at current limit brake time TCHOP ≈ CCHOP × VtCHOP ÷ ICHOP = 50pF × 1V ÷ 5μA = 10μs * The external part constant is a reference value. No.A1926-12/13 LV8762T ORDERING INFORMATION Device LV8762T-TLM-H Package TSSOP24 (225mil) (Pb-Free / Halogen-Free) LV8762T-MPB-H TSSOP24 (225mil) (Pb-Free / Halogen-Free) Shipping (Qty / Packing) 2000 / Tape & Reel 70 / Fan-Fold 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. 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