View LB1843V_260350.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Ordering number: EN 4385B
Monolithic Digital IC
LB1843V
Low-saturation, current-controlled bidirectional motor driver
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.
Package Dimensions
unit : mm
3179A-SSOP20
[LB1843V]
Features
. Output current limiter and detector built in . Low-saturation voltage bidirectional bridge circuit built in: typ. 400 . V sat = 0.40 Vcurrentatdrain mA A or less) in standby mode Practically no (0.1 . Input-linked reference voltage built in . Thermal shutdown circuit built in . Requires little space, since few external components are
O
needed and the IC is contained in a small SSOP-20 package
SANYO : SSOP20
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Maximum output current Applied input voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Im max VIN Pd max Topr Tstg With board ( 50 x 35 x 1.6 mm )
3
Conditions
Ratings 10.5 800 -0.3 to +10 800 -20 to +80 -40 to +150
Unit V mA V mW C C
Allowable Operating Ranges at Ta = 25C
Parameter Supply voltage VM voltage High-level input voltage Low-level input voltage LIR input voltage Output current limitation Symbol VCC VM VIH VIL VLIR Ilimit Conditions Ratings 3.0 to 9.0 2.2 to VCC 3.0 to 9.0 -0.3 to +0.7 0.5 to VCC-1.0 50 to 350 Unit V V V V V mA
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O3096HA(II) No.4385-1/6
LB1843V
Electrical Characteristics at Ta = 25C, VCC = 7.2 V
Parameter Supply current Symbol ICC0 ICC1 ICC2 Vsat1 Vsat2 Vref Ilimit IIN VRDsat Conditions During standby During bidirectional operation, no load During braking IO = 200 mA (upper side + lower side) IO = 400 mA (upper side + lower side) IVref = 1 mA Resistance between VCC and VM = 1 , when LIR = 2 V VIN = 5 V IO = 1 mA min typ 0.1 9 12 0.20 0.40 2.0 185 90 max 10 13 18 0.30 0.60 2.15 205 150 0.3 Unit A mA mA V V V mA A V
Output saturation voltage Reference voltage Set output current Input current RD saturation voltage
1.85 165
Output current limit is determined by the following equation (Rf is the sensing resistance between VCC and VM): Ilimit = VLIR/10Rf (A) The input range for VLIR is 0.5 to VCC-1.0 (V) Allowable power dissipation, Pd max - mW
Pd max - Ta
Specified board (50 x 35 x 1.6 mm3 glass epoxy)
Ambient temperature, Ta - C
No.4385-2/6
LB1843V
Block Diagram and Sample Application Ciruit
VCC = 3 to 10.5 V Rf = 0.47 to 2
0.001 F to 0.01 F
Thermal shut down
Decoder
Limit detection
Pin Assignment
Notes:
. Connect both V pins (motor power . Connect both supply/sensing pins). P-GND pins (motor power supply GND pins). . Connect S-GND (control power
M
supply GND pin) to the microcontroller's GND. Top view
No.4385-3/6
LB1843V
Truth Table
Input IN1 L H L H IN2 L L H H off H L L Output OUT1 OUT2 off L H L Mode Standby Forward Reverse Brake
Output Current Limitation and Detector Output
DEL H L OUT output Limit Non-limit Saturated RD L Off 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.4385-4/6
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 x 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 limit Non-limit (saturated) Saturated RD L H H
Output Current Limiter and Set Current Detector Block Diagram
Set current detector
No.4385-5/6
LB1843V
ICC - VCC
Rf = 0.5 , no load
IIN - VIN
Brake
Current drain, ICC - mA
Bidirectional
Supply voltage, VCC - V Ilimit - VLIR Set output current, Ilimit - mA Set output current, Ilimit - mA
Input current, IIN - A
Input voltage, VIN - V Ilimit - VCC
Output saturation voltage, VO(sat) - V
VLIR - V VO(sat) - IO Output saturation voltage, VO(sat) - V
Supply voltage, VCC - V VO(sat) - Ta
Output current, IO - mA
Ambient temperature, Ta - C
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of October, 1996. Specifications and information herein are subject to change without notice. No.4385-6/6

▲Up To Search▲

Price & Availability of LB1843V

	To Download LB1843V Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .