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| TA8050F TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8050F 1.5 A DC Motor Driver with Brake Function The TA8050F is a 1.5 A motor driver which directly drives a bidirectional DC motor. Inputs DI1 and DI2 are combined to select one of forward, reverse, stop, and brake modes. Since the inputs are TTL-compatible, this IC can be controlled directly from a CPU or other control system. The IC also has various protective functions. Features * * * * * * * Bidirectional DC motor driver Current capacity Four modes : 1.5 A : Forward, Reverse, Stop, and Brake Weight: 0.79 g (typ.) Recommended operating supply voltage range : VCC = 6~16 V Protective functions : Thermal Shutdown, Short Circuit Protection, and Overvoltage Shutdown Built-in diode for counteracting counter electromotive force HSOP-20 Pin power flat package Block Diagram and Pin Layout M (-) 20 19 18 17 16 GND FIN M (+) 15 14 13 12 11 Thermalshutdown and over-voltage protection Short protection Control logic 1 VCC 2 3 VCC 4 5 FIN GND 6 7 8 9 10 DI1 DI2 1 2002-02-27 TA8050F Pin Description Pin No. 1 3 FIN 8 9 15 16 2, 4~7 10~14 17~20 Symbol VCC GND DI1 DI2 M (+) M (-) Description Power supply pin. This pin has a function to turn off the output when the applied voltage exceeds 27.5 V, thus protecting the IC and the load. Grounded Output status control pin. Connects to a PNP-type voltage comparator. Connects to the DC motor. Both the sink and the source have a current capacity of 1.5 A. Diodes for absorbing counter electromotive force are contained on the VCC and GND sides. Connects to the DC motor together with pin 15 and has the same function as pin 3. This pin is controlled by the inputs from pins 8 and 9. Not connected. (Electrically, this pin is completely open.) NC Truth Table DI1 H L H L Input/Output Input DI2 H H L L M (+) L L H Output M (-) L H L (Note 2) (Note 1) OFF (high impedance) Note 1: Brake mode comes into effect when both M (+) and M (-) go low. Note 2: Stop mode comes into effect when both M (+) and M (-) turn OFF. 2 2002-02-27 TA8050F Description of Multi-Protective Operation The TA8050F has functions for protection from overvoltage (VSD), overcurent (ISD), and overheat (TSD). These functions protect the IC (and the motor load in some cases) from deterioration or destruction due to power-related overstress. The three functions work independently. Each function is explained below. VSD ISD TSD CONTROL LOGIC DI1 DI2 M (+) M (-) 1. Overvoltage protection (VSD) Basic operation When the voltage supplied to the VCC pin is up to the VSD detection voltage, the output is controlled by the input signals. However, when the VCC voltage exceeds the detection voltage, the output enters high-impedance state regardless of the input signals. Detailed explanation The VSD voltage is detected by comparing the Zener voltage with the voltage obtained by dividing VCC with a resistor. When the center voltage of the resistor is higher than the Zener voltage, a transistor-off instruction is issued to the control logic. When it is lower than the Zener voltage, the logic is controlled by the input signals from DI1 and DI2. 2. Overheat protection (TSD) Basic operation When the junction (chip) temperature is up to the TSD detection temperature, the output is controlled by the input signals. When it exceeds the TSD detection temperature, the output enters high-impedance state regardless of the input signals. Detailed explanation The temperature is detected by monitoring VF of a diode on the chip. When the diode VF is lower than the internal reference voltage, an output transistor-off instruction is issued to the control logic. When it is higher than the internal reference voltage, the logic is controlled by the input signals from DI1 and DI2. 3 2002-02-27 TA8050F 3. Overcurrent protections (ISD) * Basic operation When the output current (M (+) or M (-)Isink or Isource) is up to the ISD detection current, the output is controlled by the input signals. When it exceeds the detection current, the output assumes a switching waveform as shown in Figure 1. ON ISD or more ON ON ON OFF 20 ms Typ. OFF 80 ms Typ. OFF Figure 1 Detailed explanation Basic operation The output current is detected by monitoring the VBE from each output transistor. One detection circuit connects to one of the output transistors and leads to the short-circuit protection circuit. When a current exceeding the ISD detection current flows through one of the four output transistors, the short-circuit protection circuit is activated. This circuit contains a timer. When overcurrent condition continues for 20 ms (typically) , the protection circuit places the output in high-impedance mode and, 80 ms (typically) later, returns the IC to ON mode. The switching-waveform output is repeated until overcurrent condition is no longer present. 4 2002-02-27 TA8050F Maximum Ratings (Ta = 25C) Characteristics Supply voltage Input voltage Output current Operation temperature Storage temperature Lead temperature time Symbol VCC VCC VIN IO*AVE Topr Tstg Tsol Rating 30 60 (1 s) -0.3~VCC 1.5 -40~110 -55~150 260 (10 s) V A C C C Unit V HSOP20-P-450-1.00 Thermal Resistance Data (Ta = 25C) Characteristics Rqj-a Rqj-c PD1 PD2 PD3 PD4 Rating 125 13 1.0 1.5 3.2 9.6 Unit C/W C/W W W W W Test Condition 3/4 3/4 Without radiation board 60 30 1.6 mm 50%Cu mounted 50 50 1.0 mm Iron board mounted Infinite radiation board mounted Electrical Characteristics (Unless otherwise specified, VCC = 6~16 V, Tc = -40~110C) Characteristics Symbol ICC1 Current consumption ICC2 ICC3 Input voltage VIL VIH Input current IIL IIH Output saturation voltage Vsat (total) ILEAK-U ILEAK-L Diodes forward voltage Over-current detection Shutdown temperature Over-voltage detection Transfer delay time VF-U VF-L ISD TSD VSD M (+)/M (-) M (+)/M (-) DI1/DI2 DI1/DI2 VCC Pin Test Circuit 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Test Condition Stop Forward/Reverse Brake 3/4 3/4 VIN = 0.4 V VIN = VCC IO = 1.5 A, Tc = 25C IO = 1.5 A, Tc = 110C VO = 0 V VO = VCC IF = 1.5 A 3/4 3/4 3/4 3/4 3/4 Min 3/4 3/4 3/4 3/4 2.0 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 1.8 3/4 25 3/4 3/4 Typ. 8 27 16 3/4 3/4 3/4 3/4 2.2 2.2 3/4 3/4 2.6 1.5 3 150 27.5 1 1 Max 15 50 30 0.8 3/4 -100 100 2.9 V 2.8 -100 100 3/4 3/4 4 3/4 30 10 10 mA V mA Unit mA Output leakage current M (+)/M (-) V A C V mS tPLH tPHL Note 3: The parameter values above are guaranteed in the operating voltage rage of 6 V to 16 V. If the guaranteed range is exceeded in practical use, make sure that the IC operates normally in application. 5 2002-02-27 TA8050F I/O Equivalent Circuit VCC 1, 3 M (+) 15 M (-) 16 GND FIN Thermal shutdown and overvoltage protection circuits Control logic Short protection circuit DI1 8 DI2 9 6 2002-02-27 TA8050F VOL, VOH - IOUT 0 10 (1) 25C 0.5 110C 1.0 8 PD MAX - Ta (1) Infinite radiation board (2) 50 50 1.0 mm Fe (3) 60 30 1.6 mm Cu 50% PCB board (4) No radiation board VOH (V) 1.5 Maximum power dissipation PD MAX -40C Output saturation voltage (W) 6 2.0 4 (2) 1.5 -40C 1.0 2 VOL (V) 110C 0.5 25C 0 0 0 0 (3) (4) 1.0 1.5 50 100 150 200 0.5 Output current IOUT (A) Ambient temperature Ta (C) Example of Application Circuit +V 5V * C1 10 mF 1 VDD OUTPUT PORT1 PORT2 VSS VCC 8 DI1 TA8050F 9 DI2 GND FIN M (+) 15 3 VCC M (-) 16 M Microprocessor *: Connect this capacitor as close to the IC as possible. 7 2002-02-27 TA8050F Package Dimensions Weight: 0.79 g (typ.) 8 2002-02-27 TA8050F RESTRICTIONS ON PRODUCT USE 000707EAA_S * TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability Handbook" etc.. * The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others. * The information contained herein is subject to change without notice. 9 2002-02-27 |
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