Reversible Motor Drivers for Brush Motors 0.5A or Less Reversible Motor Driver (Single Motor) BA6950FS 0.8A Reversible Motor Driver (Single Motor) BA6951FS No.11008ECT01 ●Description These drivers are reversible motor drivers that can directly drive brush motor which require forward and reverse rotations. Four modes of output setting are available by the use of input logic (2 inputs); forward, reverse, stop (idling), and braking. In addition, since voltage applied to motors varies in accord with the control terminal, motor rotating speed can be optionally set and by the built-in current feedback amplifier, the motor can be driven at a constant speed. ●Features 1) Four-mode outputs of forward, reverse, stop (idling), and braking are enabled in compliance with two inputs 2) Motors can be driven at a constant speed by a current feedback amplifier 3) Built-in thermal shutdown circuit 4) Built-in current limiting function (BA6951FS) ●Applications Audio-visual equipment; PC peripherals; Car audios; Car navigation systems; OA equipments ●Absolute maximum ratings (Ta=25℃, All voltages are with respect to ground) Ratings Parameter Symbol BA6950FS BA6951FS Supply voltage VCC Supply voltage VB 8 Unit V 18 V 1 1 Output current IOMAX Operating temperature TOPR -20 ~ 75 ℃ Storage temperature TSTG -55 ~ 150 ℃ Power dissipation Junction temperature 0.4* 0.8* 2 A Pd 0.813* W Tjmax 150 ℃ *1 Do not, exceed Pd or ASO. *2 SSOP-A16 package. Mounted on a 70mm x 70mm x 1.6mm FR4 glass-epoxy board with less than 3% copper foil. Derated at 6.4mW/℃ above 25℃. ●Operating conditions (Ta=25℃) Parameter Symbol Ratings Unit Supply voltage VCC 3~6 V Supply voltage VB 3 ~ 16 V VTCL voltage VCTL 0 ~ (VCC-1.8) V www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1/10 2011.05 - Rev.C Technical Note BA6950FS, BA6951FS ●Electrical characteristics (BA6950FS, unless otherwise specified, Ta=25℃ and VCC=4.8V, VB=4.8V) Limits Parameter Symbol Unit Conditions Min. Typ. Max. Supply current 1 ICC1 - 4.0 6.0 mA FWD/REV mode, VCTL=0V Supply current 2 ICC2 - 0.7 1.5 mA Standby mode, VCTL=0V Supply current 3 IBOFF - 0 1 µA VCC=0V Input threshold voltage H VR/F H 2.0 - VCC V Input threshold voltage L VR/F L 0 - 0.8 V Input bias current IR/F H - 80 135 µA FIN=2V, RIN=2V CTL amplifier offset voltage VCTLOFS -5 0 5 mV VCTL-RC, VCTL=0V, 1V CTL amplifier gain VCTLGA 40 46 52 µA/V ΔIRT1, VCTL=2V, 1V CTL output mirror ratio 1 ICTLR1 0.85 1.00 1.15 ratio IRT1/IRC, IRC=20µA CTL output mirror ratio 2 ICTLR2 0.90 1.00 1.10 ratio IRT1/IRC, IRC=200µA CS amplifier offset voltage CSOFS -5 0 5 mV CS1-CS2, CS1=0V, 0.1V CS output mirror ratio 1 ICSR1 0.85 1.00 1.15 ratio IRT2/ICS2, ICS=20µA CS output mirror ratio 2 ICSR2 0.90 1.00 1.10 ratio IRT2/ICS2, ICS=200µA Output high voltage VH 2.0 4.6 - V M1, M2, VCTL=0.2V Output saturation voltage H VOH - 0.09 0.3 V IO=50mA, RT1=VCC Output saturation voltage L VOL - 0.07 0.2 V IO=50mA, RT1=VCC ●Electrical characteristics (BA6951FS, unless otherwise specified, Ta=25℃ and VCC=4.8V, VB=4.8V) Limits Parameter Symbol Unit Conditions Min. Typ. Max. Supply current 1 ICC1 - 4.0 6.0 mA FWD/REV mode, VCTL=0V Supply current 2 ICC2 - 0.7 1.5 mA Standby mode, VCTL=0V Supply current 3 IBOFF - 0 1 µA VCC=0V Input threshold voltage H VR/F H 2.0 - VCC V Input threshold voltage L VR/F L 0 - 0.8 V Input bias current IR/F H - 80 135 µA FIN=2V, RIN=2V CTL amplifier offset voltage VCTLOFS -5 0 5 mV VCTL-RC, VCTL=0V, 1V CTL amplifier gain VCTLGA 40 46 52 µA/V ΔIRT1, VCTL=2V, 1V CTL output mirror ratio 1 ICTLR1 0.85 1.00 1.15 ratio IRT1/IRC, IRC=20µA CTL output mirror ratio 2 ICTLR2 0.90 1.00 1.10 ratio IRT1/IRC, IRC=200µA CS amplifier offset voltage CSOFS -5 0 5 mV ATC-CS, ATC=0V, 0.1V CS output mirror ratio 1 ICSR1 0.85 1.00 1.15 ratio IRT2/ICS, ICS=20µA CS output mirror ratio 2 ICSR2 0.90 1.00 1.10 ratio IRT2/ICS, ICS=200µA TL-RAOFS offset voltage TL-RAOFS 6 18 30 mV TL=0.3V, RATC=1.0Ω Output high voltage VH 1.85 2.20 2.55 V M1, M2, VCTL=1.0V Output saturation voltage H VOH - 0.28 0.56 V IO=300mA, RT1=VCC Output saturation voltage L VOL - 0.32 0.64 V IO=300mA, RT1=VCC www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2/10 2011.05 - Rev.C Technical Note BA6950FS, BA6951FS ●Electrical characteristic curves (Reference data) 0.4 0.9 4 3 -20°C 25°C 75°C 2 1 0.8 0.7 -20°C 25°C 75°C 0.6 0.5 0.4 3 4 5 6 Fig.1 Supply current 1 (Forward) (BA6950FS) 5 3 -20°C 25°C 75°C 2 4 5 3 400 0.8 0.7 -20°C 25°C 75°C 0.6 0.5 5 6 0 4.4 4.2 4.0 0.8 0.6 0.4 0.2 0.4 0.1 0.2 0.3 4.2 4.0 0 1 0.8 Output Current: Iout [A] Fig.10 Output saturation voltage H (BA6951FS) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2 3 4 Input Voltage: VR/F [V] Fig.9 Input threshold voltage 1.5 ii) Mounted on ROHM standard PCB 75°C 25°C -25°C 0.8 (70mm x 70mm x 1.6mm FR4 glas s-epox y board) i) Package only 1.0 ii) 0.813W 0.6 0.4 0.5 i) 0.625W 0.2 0.0 0.6 1.0 Pd [W] 4.4 0.4 75°C 25°C -25°C 2.0 Fig.8 Output saturation voltage L (BA6950FS) Output Low Voltage: VOL [V]_ -20°C 25°C 75°C 0.2 3.0 0.4 1.0 4.8 5 4.0 Output Current: Iout [A] 5.0 4 0.0 0 Fig.7 Output saturation voltage H (BA6950FS) 3 5.0 75°C 25°C -25°C Output Current: Iout [A] 0 2 Fig.6 Input bias current 0.0 4.6 1 Input Voltage: VR/F [V] Output High Voltage: VOH [V] _ -20°C 25°C 75°C 0.3 -25°C 25°C 75°C 100 Fig.5 Supply current 2 (Standby) (BA6951FS) Output Low Voltage: VOL [V]_ 4.8 0.2 200 0 4 1.0 0.1 300 Supply Voltage: Vcc [V] 5.0 6 Fig.3 Supply current 3 3 Fig.4 Supply current 1 (Forward) (BA6951FS) 5 Fig.2 Supply current 2 (Standby) (BA6950FS) Supply Voltage: Vcc [V] 0 4 Supply Voltage: VB [V] 6 4.6 0.1 Supply Voltage: Vcc [V] 0.4 3 -20°C 25°C 75°C 0.2 6 Input Bias Current: IR/F H [µA] _ 4 1 Output High Voltage: VOH [V] _ 4 0.9 Circuit Current: Icc2 [mA] _ Supply Current: Icc1 [mA]_ 5 0.3 0.0 3 Supply Voltage: Vcc [V] Output High Voltage: VOH [V] _ Circuit Current: Icc3 [µA] _ Circuit Current: Icc2 [mA] _ Supply Current: Icc1 [mA]_ 5 0.0 0 0.2 0.4 0.6 0.8 Output Current: Iout [A] Fig.11 Output saturation voltage L (BA6951FS) 3/10 0 25 50 75 100 125 150 AMBIENT TEMPERATURE [°C] Fig.12 Thermal derating curve (SSOP-A16) 2011.05 - Rev.C Technical Note BA6950FS, BA6951FS ●Block diagram and pin configuration BA6950FS VCC VCC 12 C5 FIN RIN GND VCTL 6 TSD 7 10 CTRL 5 PRE DRIVER 1 9 VB C6 M1 M2 M C3 C4 x4 CTRL AMP 2 CS AMP RC 3 PCT R1 4 CS2 14 C1 RT2 15 RT1 16 PC R2 R4 11 CS1 13 ATC 8 C2 R5 R3 Fig.13 BA6950FS Table 1 BA6950FS Pin Name Function 1 GND GND 2 VCTL Control input 3 RC Control gain setting 4 PCT CTL amp phase compensation 5 RIN Control input (reverse) 6 VB Power supply (driver stage) 7 M1 Driver output 8 ATC Current sense pin 9 M2 Driver output 10 FIN Control input (forward) 11 PC Phase compensation 12 VCC Power supply (small signal) 13 CS1 CS amp gain setting 14 CS2 CS amp gain setting 15 RT2 CTL amp gain setting 16 RT1 CTL amp gain setting www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. GND VCTL RC PCT RIN VB M1 ATC RT1 RT2 CS2 CS1 VCC PC FIN M2 Fig.14 BA6950FS (SSOP-A16) 4/10 2011.05 - Rev.C Technical Note BA6950FS, BA6951FS ●Block diagram and pin configuration BA6951FS VCC VCC 12 C5 FIN RIN GND VCTL 6 TSD 7 10 CTRL 5 PRE DRIVER 1 9 VB C6 M1 M2 M C3 C4 x4 CTRL AMP 2 CS AMP RC 3 PCT R1 4 CS C1 14 RT2 TL AMP 15 RT1 16 R4 PC R2 11 TL 13 ATC 8 R5 C2 R3 Fig.15 BA6951FS Table 2 BA6951FS Pin Name 1 GND GND Function 2 VCTL Control input 3 RC Control gain setting 4 PCT CTL amp phase compensation 5 RIN Control input (reverse) 6 VB Power supply (driver stage) 7 M1 Driver output 8 ATC Current sense pin 9 M2 Driver output 10 FIN Control input (forward) 11 PC Phase compensation 12 VCC 13 TL Torque limiter setting 14 CS CS amp gain setting 15 RT2 CTL amp gain setting 16 RT1 CTL amp gain setting GND VCTL RC PCT RIN VB M1 ATC RT1 RT2 CS TL VCC PC FIN M2 Fig.16 BA6951FS (SSOP-A16) Power supply (small signal) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 5/10 2011.05 - Rev.C Technical Note BA6950FS, BA6951FS ●External application components 1) Resistor for the current sensing, R5 This is a current sensing resistor, care must be taken to avoid changes in the ground wire pattern in any external connected component. 2) Control amplifier gain setting resistor, R1 VCTL pin voltage is buffered to RC pin, and the control gain - VCTLGA - can be set by connecting R1. The current decided here is output to RT1 pin. 3) Control amplifier phase compensation capacitor, C1 This phase compensation capacitor for the control amplifier. Please monitor the RT1 pin voltage and confirm no oscillation. About 33pF is recommended. 4) Current feedback amplifier gain setting resistor, R4 CS1 pin voltage (the motor current detection) is buffered to CS2 pin - BA6950FS. ATC pin voltage (the motor current detection) is buffered to CS pin - BA6951FS. The current feedback gain can be set by R4 connecting to CS2 or CS pin. The current decided here is output to RT2 pin. 5) Pre-amplifier gain setting resistor, R2, R3 These resistors are to add the control amplifier output and the current feedback amplifier output. This amplifier has about fourfold gain. 6) Pre-amplifier phase compensation capacitor, C2 Please connect the capacitor about 0.1µF as the phase compensation of the pre-amplifier, and monitor the driver output no oscillation. 7) Stabilization capacitor for the power supply line, C5, C6 Please connect the capacitor of 1μF to 100μF for the stabilization of the power supply line, and confirm the motor operation. 8) Phase compensating capacitor, C3, C4 Noise is generated in output pins or oscillation results in accord with the set mounting state such as power supply circuit, motor characteristics, PCB pattern artwork, etc. As noise oscillation measures, connect 0.01μF to 0.1μF capacitors. 9) Torque limiter setting, TL pin, BA6951FS only The motor current is limited so that ATC pin voltage should not exceed TL pin voltage. ●Functional descriptions Table 3 Logic table FIN RIN M1 M2 Operation L L OPEN* OPEN* Stop (idling) H L L H Forward (M2 > M1) L H H L Reverse (M1 > M2) H H L L Brake (stop) * OPEN is the off state of all output transistors. Please note that this is the state of the connected diodes, which differs from that of the mechanical relay. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 6/10 2011.05 - Rev.C Technical Note BA6950FS, BA6951FS ●External application components setting procedure The relation between VCTL and the output high voltage is as follows. · IRT1 = VCTL / R1 · IRT2 = IACT x R5 / R4 · VRT1 = R3 x ( IRT1 + IRT2 ) + R2 x IRT1 · VMX = 4 x VRT1 VMX = 4 ( R2 + R3 ) R1 x VTCL + ····· (1) ····· (2) ····· (3) ····· (4) 4 R3 R5 R4 VCTL: Torque control voltage IACT: Motor current VM1, VM2: Output high voltage x IACT ····· (5) To drive the motor by constant speed as follows. 4 R3 R5 R4 RL + RON + R5 = RL: Motor coil impedance RON: On resistance of the driver IC ····· (6) R3, R4, and R5 are first set, and then R1 and R2 are set afterwards. Table 4 External components Parts Default value Parameter Recommended condition R1 22kΩ IRT1 IRT1 < 1mA R2 + R3 1kΩ + 1.5kΩ VRT1 VRT1 x 4 < VB R4 560Ω IRT2 IRT2 < 1mA R5 5.5Ω VATC VATC < 1V C1 33pF VPCT C2 0.1µF VPC C3, C4 0.1µF VM1, VM2 C5, C6 1~100µF VCC, VB Please confirm the motor operation ●Interfaces 13.5k FIN RIN 3.6k 10k 1k 10k PCT 10k 24k VCTL 1k 20k RC 1k PC Fig. 17 FIN, RIN Fig.18 VCTL, RC, PCT Fig.19 PC VB TL 1k M1 1k 1k CS1 RT1 M2 1k RT2 CS2 1k ACT CS Fig. 20 RT1, RT2 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. Fig.21 CS1, CS2 (BA6950FS) Fig.22 CS, TL (BA6951FS) 7/10 Fig.23 VB, ACT, M1,M2 2011.05 - Rev.C Technical Note BA6950FS, BA6951FS ●Notes for use 1) Absolute maximum ratings Devices may be destroyed when supply voltage or operating temperature exceeds the absolute maximum rating. Because the cause of this damage cannot be identified as, for example, a short circuit or an open circuit, it is important to consider circuit protection measures – such as adding fuses – if any value in excess of absolute maximum ratings is to be implemented. 2) Connecting the power supply connector backward Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when connecting the power supply lines, such as adding an external direction diode. 3) Power supply lines Return current generated by the motor’s Back-EMF requires countermeasures, such as providing a return current path by inserting capacitors across the power supply and GND (10µF, ceramic capacitor is recommended). In this case, it is important to conclusively confirm that none of the negative effects sometimes seen with electrolytic capacitors – including a capacitance drop at low temperatures - occurs. Also, the connected power supply must have sufficient current absorbing capability. Otherwise, the regenerated current will increase voltage on the power supply line, which may in turn cause problems with the product, including peripheral circuits exceeding the absolute maximum rating. To help protect against damage or degradation, physical safety measures should be taken, such as providing a voltage clamping diode across the power supply and GND. 4) Electrical potential at GND Keep the GND terminal potential to the minimum potential under any operating condition. In addition, check to determine whether there is any terminal that provides voltage below GND, including the voltage during transient phenomena. When both a small signal GND and high current GND are present, single-point grounding (at the set’s reference point) is recommended, in order to separate the small signal and high current GND, and to ensure that voltage changes due to the wiring resistance and high current do not affect the voltage at the small signal GND. In the same way, care must be taken to avoid changes in the GND wire pattern in any external connected component. 5) Thermal design Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) under actual operating conditions. 6) Inter-pin shorts and mounting errors Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any connection error, or if pins are shorted together. 7) Operation in strong electromagnetic fields Using this product in strong electromagnetic fields may cause IC malfunctions. Use extreme caution with electromagnetic fields. 8) ASO - Area of Safety Operation When using the IC, set the output transistor so that it does not exceed absolute maximum ratings or ASO. 9) Built-in thermal shutdown (TSD) circuit The TSD circuit is designed only to shut the IC off to prevent thermal runaway. It is not designed to protect the IC or guarantee its operation in the presence of extreme heat. Do not continue to use the IC after the TSD circuit is activated, and do not operate the IC in an environment where activation of the circuit is assumed. 10) Capacitor between output and GND In the event a large capacitor is connected between the output and GND, if VCC and VIN are short-circuited with 0V or GND for any reason, the current charged in the capacitor flows into the output and may destroy the IC. Use a capacitor smaller than 0.47μF between output and GND. 11) Testing on application boards When testing the IC on an application board, connecting a capacitor to a low impedance pin subjects the IC to stress. Therefore, always discharge capacitors after each process or step. Always turn the IC's power supply off before connecting it to or removing it from the test setup during the inspection process. Ground the IC during assembly steps as an antistatic measure. Use similar precaution when transporting or storing the IC. 12) Switching of rotating direction (FWD/REV) When the rotating direction is changed over by the motor rotating condition, switch the direction after the motor is temporarily brought to the BRAKE condition or OPEN condition. It is recommended to keep the relevant conditions as follows: via BRAKE: Longer than braking time*. (* the time required for the output voltage to achieve potential below GND when brake is activated.) via OPEN: The time longer than 1 ms is recommended. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 8/10 2011.05 - Rev.C Technical Note BA6950FS, BA6951FS 13) Regarding the input pin of the IC This monolithic IC contains P+ isolation and P substrate layers between adjacent elements, in order to keep them isolated. P-N junctions are formed at the intersection of these P layers with the N layers of other elements, creating a parasitic diode or transistor. For example, the relation between each potential is as follows: When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode. When GND > Pin B, the P-N junction operates as a parasitic transistor. Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits, as well as operating malfunctions and physical damage. Therefore, do not use methods by which parasitic diodes operate, such as applying a voltage lower than the GND (P substrate) voltage to an input pin. Transistor (NPN) Resistor Pin A Pin B C Pin B B E Pin A B N P+ N P+ P N N P substrate Parasitic element GND P+ + P Parasitic element P N E P substrate Parasitic Parasitic element GND Appendix: Example of monolithic IC structure www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. C N 9/10 GND GND element Other adjacent elements 2011.05 - Rev.C Technical Note BA6950FS, BA6951FS ●Ordering part number B A 6 Part No. 9 5 0 F Part No. 6950 6951 S - Package FS: SSOP-A16 E 2 Packaging and forming specification E2: Embossed tape and reel SSOP-A16 <Tape and Reel information> 6.6 ± 0.2 (MAX 6.95 include BURR) Tape Embossed carrier tape Quantity 2500pcs 9 Direction of feed 0.3MIN 4.4±0.2 6.2±0.3 16 15 14 13 12 11 10 1 2 3 4 5 6 7 E2 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 8 0.11 1.5±0.1 0.15 ± 0.1 0.8 0.1 0.36 ± 0.1 1pin Reel (Unit : mm) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 10/10 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2011.05 - Rev.C Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. 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