Ordering number : EN4385D LB1843V Monolithic Linear IC Low-saturation, current-controlled bidirectional motor driver http://onsemi.com Overview The LB1843V is a low-saturation bidirectional motor driver with output current limitation and detection functions. This design is ideal for controlling the loading motor in a video camera. Function • Output current limiter and detector built in. • Low-saturation voltage bidirectional bridge circuit built in: VOsat = 0.40 V typ. at 400 mA. • Practically no current drain (0.1 μA or less) in standby mode. • Input-linked reference voltage built in . • Thermal shutdown circuit built in. • Requires little space, since few external components are needed and the IC is contained in a small SSOP-20 package SSOP20 (225mil) Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Symbol Conditions Ratings Unit VCC max 10.5 V 800 mA Maximum output current Im max Applied Input voltage VIN Allowable power dissipation Pd max Operating temperature Topr -20 to +80 °C Storage temperature Tstg -40 to +150 °C -0.3 to +10 With board (50x35x1.6mm) V 800 mW 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 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. Recommended Operating Conditions at Ta = 25°C Parameter Supply voltage Symbol Conditions VCC Ratings min typ max Unit 3.0 9.0 V VM voltage VM 2.2 VCC V High-level input voltage VIH 3.0 9.0 V Low-level input voltage VIL -0.3 +0.7 V LIR input voltage VLIR 0.5 VCC-1.0 Output current limitation I limit 50 350 V mA 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. ORDERING INFORMATION See detailed ordering and shipping information on page 10 of this data sheet. Semiconductor Components Industries, LLC, 2014 February, 2014 22814NK B8-7154 / O3096HA(II) No.4385-1/10 LB1843V Electrical Characteristics at Ta = 25°C, VCC = 7.2V Parameter Supply current Symbol Conditions ICC0 During standby ICC1 During bidirectional operation, no load Ratings min typ Unit max 0.1 10 μA 9 13 mA mA ICC2 During braking 12 18 Output saturation voltage Vsat1 IOUT = 200mA (upper side + lower side) 0.20 0.30 V (upper side + lower side) Vsat2 IOUT = 400mA (upper side + lower side) 0.40 0.60 V Reference voltage Vref IVref = 1mA 1.85 2.0 2.15 V Set output current Ilimit Resistance between VCC and VM = 1Ω, 165 185 205 mA 90 150 μA 0.3 V when LIR = 2V Input current RD saturation voltage IIN VIN = 5V VRDsat Io = 1mA Output current limit is determined by the following equation (Rf is the sensing resistance between VCC and VM): I limit = VLIR / 10Rf (A) The input range for VLIR is 0.5 to VCC – 1.0(V) 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.4385-2/10 LB1843V Package Dimensions SSOP20 (225mil) CASE 565AN ISSUE A SOLDERING FOOTPRINT* 5.80 1.0 (Unit: mm) 0.32 GENERIC MARKING DIAGRAM* XXXXXXXXXX YMDDD 0.65 NOTE: The measurements are not to guarantee but for reference only. *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. XXXXX = Specific Device Code Y = Year M = Month DDD = Additional Traceability Data *This information is generic. Please refer to device data sheet for actual part marking. No.4385-3/10 LB1843V Block Diagram and Sample Application Circuit Pin Assignment No.4385-4/10 LB1843V Pin Functions Pin No. Pin name Pin Function 13 IN1 Control signal input pin 14 IN2 Control signal input pin Equivalent Circuit VCC 50K 80K 4K S-GND 15 DEL Control signal input pin 4,5 VM Output current detect pin 2,3 OUT1 Out pin 18,19 OUT2 Out pin Continued on next page. No.4385-5/10 LB1843V Continued from preceding page. 9 Vref Reference voltage output pin 12 RD Lock detect signal output pin 17 LIR Output current setting pin Power supply voltage pin 6 VCC 11 S-GND Signal ground pin 1,20 P-GND Power ground pin NC No connect 7,8,10,16 No.4385-6/10 LB1843V Truth Table Input Output IN1 IN2 OUT1 OUT2 Mode L L Off Off Standby H L H L Forward L H L H Reverse H H L L Brake Output Current Limitation and Detector Output DEL H L OUT output RD Limit L Non-limit Off Saturated Off Sample Application Timing Chart Sample application timing chart 1) Connect a DC motor (RL = R) between OUT1 and OUT2, and with the RD pin pulled up, input a forward rotation signal (IN1 = high, IN2 = low). Because the output is used in the saturated state at startup, set the DEL input to low. 2) The DC motor starts up, and the startup current (IST = VM/R) flows to the motor. 3) The DC motor rotates in the normal state. At this point, set the DEL input to high. 4) If the DC motor locks, the motor current IM increases to the point of Ilimit (= VLIR/(10Rf)), the output current limiter operates to limit the output current. At the same time, RD is output low from the set current detection circuit. No.4385-7/10 LB1843V Reference voltage (Vref) The Vref output is linked to the input; if either IN1 or IN2 is high, the reference voltage is output. Output current limiter The schematic for the output current limiter is shown below. The output set current is set according to the reference voltage VLIR applied to the LIR pin. When VLIR is applied, 1/10 of that voltage is generated at both ends of RS in the diagram; this voltage is input on the positive (+) side of the current setting amplifier. The motor current IM generates voltage equal to (IM ´ Rf) at both ends of the external resistor Rf. This voltage is input to the negative (–) side of the same amplifier, and the differential amplifier functions and the output transistors are driven so that these inputs become equal. The set current value in this instance is determined by the following equation: Ilimit = VLIR/(10Rf) [A] Set current detector (1) When DEL = high If the motor current IM has not reached the set current Ilimit, the input voltage on the negative (–) side of the amplifier is greater than the input voltage on the positive (+) side. As a result, the drive current increases and the output PNP transistors reach the saturation state. If this state is detected, the detection signal is sent to the set current detector, and the RD output goes high. If the motor current IM reaches the set current Ilimit, the output PNP transistor enters the controlled state, and the RD output goes low. (2) When DEL = low Because the operation of the current setting amplifier is cancelled when a low signal is input to the DEL pin, the output PNP transistors reach the saturation state and the RD output goes high, just as in the case described above. The following table summarizes the states described above. DEL H L OUT output RD Limit L Non-limit Off Saturated Off Output Current Limiter and Set Current Detector Block Diagram No.4385-8/10 LB1843V ICC -- VCC VIN=3V LIR=Vref Rf=0.5W, no load Current drain, ICC -- mA 14 Brake Bidirectional DEL=L 8 DEL=H 6 4 0 1 2 3 4 5 6 7 8 9 10 Supply voltage, VCC -- V .5 W 400 W 1.0 200 100 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 0.2 0.1 100 200 300 400 500 600 Output current, IO -- mA 700 800 ILB00878 5 6 7 8 9 11 Ilimit -- VCC Ilimit=300mA 200mA 100mA 100 0.3 10 ILB00875 0 1 2 3 4 5 6 7 8 9 Supply voltage, VCC -- V Output saturation voltage, VO(sat) -- V 0.3 4 200 0.4 0.4 0 3 ILB00876 VCC=6.0V VIN=3.0V LIR=Vref DEL=L 0.5 2 300 0 4.8 VO(sat) -- IO 0.6 1 Input voltage, VIN -- V Set output current, Ilimit -- mA VCC=6.0V RL=10W 300 0 400 R f =0 Set output current, Ilimit -- mA 80 0 12 500 0 120 ILB00874 VLIR -- V Output saturation voltage, VO(sat) -- V 11 Ilimit -- VLIR 600 0 160 40 2 0 VCC=6.0V 200 12 10 IIN -- VIN 240 Input current, IIN -- mA 16 10 11 ILB00877 VO(sat) -- Ta VCC=6.0V VIN=3.0V LIR=Vref DEL=L A 0m I O=40 0.2 200mA 0.1 0 --40 --20 0 20 40 60 80 100 120 140 160 ILB00879 No.4385-9/10 LB1843V ORDERING INFORMATION Device LB1843V-MPB-E Package SSOP20 (225mil) (Pb-Free / Halogen Free) LB1843V-TLM-E SSOP20 (225mil) (Pb-Free / Halogen Free) Shipping (Qty / Packing) 70 / Fan-Fold 2000 / Tape & Reel ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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