TB67S158NG

TB67S158NG TOSHIBA Bi-CD Integrated Circuit Silicon Monolithic TB67S158NG 1. Summary/Features/Appearance Constant voltage control DMOS driver incorporating 2 function modes (full parallel input and serial input). Summary The TB67S158 is a constant voltage control DMOS driver. It can operate maximum of two unipolar stepping motors (max). MODE1: Full parallel input (similar to transistor array) MODE2: Serial input NG Output voltage of 80V and maximum current of 1.5A are realized by applying BiCD process. Motor can be driven by single power supply of VM with the internal regulator. P-SDIP24-0723-1.78-001 Weight: 1.4g(typ.) Features ・Capable of operating maximum of two 2-phase unipolar stepping motors by one chip. ・High voltage and current (as for specifications, please refer to the absolute maximum ratings and operation ranges). ・Low on resistance (Ron=0.5Ω (typ.)) of output step is realized by BiCD process. ・Built-in VCC regulator for internal circuit control (capable of operating by only VM power supply) ・Capable of constant voltage driving (corresponding to 2-phase and 1-2-phase excitation drives) ・Built-in thermal shutdown circuit (TSD), over current detection (ISD), and power on reset of VM power supply. ・ALERT signal can be outputted to outside when thermal shutdown circuit (TSD) or over current detection (ISD) operates. Note) Please be careful about the thermal conditions during use. ©2014 Toshiba Corporation 1 2015-5-11 TB67S158NG 2. Block diagram: MODE1 (Full parallel mode) IN_A1 IN_A2 IN_B1 IN_B2 MODE Polarity and Angle control A Polarity and Angle control B Ach Pre drv Ach OUT Nch×2 Bch Pre drv Bch OUT Nch×2 OUT_A+ OUT_AVCOMAB OUT_B+ OUT_B- MODE Control Error detect (TSD/ISD) Internal OSC POR VM ERR Pre TSD VCC regulator IN_C1 IN_C2 IN_D1 IN_D2 Polarity and Angle control C Polarity and Angle control D 2 Cch Pre drv Cch OUT Nch×2 Dch Pre drv Dch OUT Nch×2 OUT_C+ OUT_CVCOMCD OUT_D+ OUT_D- 2015-5-11 TB67S158NG 3. Pin name/assignment Pin assignment (TB67S158NG) MODE1 (Full parallel mode) (Top View) OUT_C- 1 24 PGND_CD OUT_C+ 2 23 OUT_D- IN_D1 3 22 OUT_D+ IN_D2 4 21 VCOM_CD IN_C1 5 20 LGND IN_C2 6 19 ERR IN_A1 7 18 VM IN_A2 8 17 MODE IN_B1 9 16 VCOM_AB IN_B2 10 15 OUT_B+ OUT_A+ 11 14 OUT_B- OUT_A- 12 13 PGND_AB 3 2015-5-11 TB67S158NG 3-1. Application Notes 1) All the grounding wires of the device must run on the solder mask on the PCB and be externally terminated at only one point. Also, a grounding method should be considered for efficient heat dissipation. 2) When setting pin of each mode is controlled by SW, the voltage should be pull-up to the power supply which is the same voltage of the input signal or pull-down to the GND in order to avoid Hi-Z. 3) Careful attention should be paid to the layout of the output, VM and GND traces, to avoid short circuits across output pins or to the power supply or ground. If such a short circuit occurs, the device may be permanently damaged. 4) Also, the utmost care should be taken for pattern designing and implementation of the device since it has power supply pins (VM, OUT, GND, etc.) through which a particularly large current may run. If these pins are wired incorrectly, an operation error may occur or the device may be destroyed. The logic input pins must also be wired correctly. Otherwise, the device may be damaged owing to a current running through the IC that is larger than the specified current. 4 2015-5-11 TB67S158NG 3-2. Pin assignment and description of TB67S158 (SDIP) Pin No. Full parallel (MODE=L) Serial/Parallel (MODE=H) Full parallel (MODE=L) Serial/Parallel (MODE=H) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 OUT_COUT_C+ IN_D1 IN_D2 IN_C1 IN_C2 IN_A1 IN_A2 IN_B1 IN_B2 OUT_A+ OUT_APGND_AB OUT_BOUT_B+ VCOM_AB MODE VM ERR LGND VCOM_CD OUT_D+ OUT_DPGND_CD OUT_COUT_C+ DATA CLK ALM NC CLR GATE STBY LATCH OUT_A+ OUT_APGND_AB OUT_BOUT_B+ VCOM_AB MODE VM ERR LGND VCOM_CD OUT_D+ OUT_DPGND_CD Output - pin for phase C Output + pin for phase C OUT_D+ ON pin OUT_D- ON pin OUT_C+ ON pin OUT_C- ON pin OUT_A+ ON pin OUT_A- ON pin OUT_B+ ON pin OUT_B- ON pin Output + pin for phase A Output - pin for phase A Power ground pin Output - pin for phase B Output + pin for phase B Common pin for phase A and B Switching pin for I/F Pin for main power supply ERR output Logic_GND Common pin for phase C and D Output + pin for phase D Output - pin for phase D Power ground pin Output - pin for phase C Output + pin for phase C Input pin for serial data Input pin for serial clock Output pin for thermal detection NC Clear pin for storage register Gate pin for register data Standby setting pin Input pin for serial latch Output + pin for phase A Output - pin for phase A Power ground pin Output - pin for phase B Output + pin for phase B Common pin for phase A and B Switching pin for I/F Pin for main power supply ERR output Logic_GND Common pin for phase C and D Output + pin for phase D Output - pin for phase D Power ground pin 5 2015-5-11 TB67S158NG 4. Functional/Operation description 4-1.Pin interface TB67S158NG 1kΩ Logic Output pin (ERR) 100kΩ Logic Input pin GND GND VCOM OUT+ OUT- GND The equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes. 6 2015-5-11 TB67S158NG Protection circuit Note: Logic pin is pull-down or pull-up by the resistor of about 100 kΩ in the IC. (Confirm the input equivalent circuit.) Functional description ISD (over current detection) ISD turns off the output of the motor when it detects over current (exceeding absolute maximum rating) in the output transistors. It is cleared when VM power supply is applied again or configured standby mode. TSD (thermal shutdown circuit) TSD turns off all outputs of the motor when it detects abnormal temperature (Tj =160°C (typ.)) of the IC. It is cleared when VM power supply is applied again or configured standby mode. VMR (VM power supply monitor) circuit When the voltage of VM is higher than the specified value, output is set high level. When it is lower than the specified value, output is set low (internal status). POR (Power On Reset) circuit When both VMR and VCCR are high: Logic transistors = active, Other states: Logic transistors = OFF 7 2015-5-11 TB67S158NG 5. MODE pin MODE Function L MODE1 Full parallel control I/F (Similar operation of transistor array) H MODE2 Serial/Parallel conversion control I/F 6. Pin function of full parallel control I/F (Mode1) IN_X pin can control each transistor directly like transistor array. IN_A1 IN_A2 IN_B1 IN_B2 Function L - - OUT_A+ = OFF H - - OUT_A+ = ON - L - - OUT_A- = OFF - H - - OUT_A- = ON - - L - OUT_B+ = OFF - - H - OUT_B+ = ON - - - L OUT_B- = OFF - - - H OUT_B- = ON IN_C1 IN_C2 IN_D1 IN_D2 Function L - - OUT_C+ = OFF H - - OUT_C+ = ON - L - - OUT_C- = OFF - H - - OUT_C- = ON - - L - OUT_D+ = OFF - - H - OUT_D+ = ON - - - L OUT_D- = OFF - - - H OUT_D- = ON 8 2015-5-11 TB67S158NG 6-1. ERR (output function of abnormal detection) ERR output Function H Normal operation L Abnormal detection (TSD or ISD) ERR pin is a logic output pin of open drain type. It outputs high level (pull-up voltage level) in the normal operation. It outputs low (GND level) when TSD or ISD operates. When TSD or ISD detection is cleared, high level is outputted. 3.3V or 5V 10kΩ ERR output ERR logic [MOSFET for ERR] ON: When abnormal detection operaties OFF: In normal operation 9 2015-5-11 TB67S158NG 7. Pin function of serial/parallel conversion control I/F (Mode2) 7-1. Input interface (8bit shift register + 8bit storage register) CLK 8bit shift register DATA CLR Qa Qb Qc Qd Qe Qf Qg Qh 8bit storage register QB QD QE QF QG QH ENABLE_C- ENABLE_C+ ENABLE_B- ENABLE_B+ ENABLE_A- Logic input gate ENABLE_A+ GATE QC ENABLE_D- QA ENABLE_D+ LATCH STBY Motor Control Logic * Initial value for each logic pin when signal is not inputted Pin name CLK DATA CLR LATCH GATE STBY Initial value Low Low Low Low High Low Initial state for each logic pin when signal is not inputted is as follows. LATCH: Low=sift register/storage register: initial state GATE: High=ENABLE_X+,ENABLE_X-=Disable * ”X” of ENABLE_X stands for A, B, C, and D. STBY=Low: standby state 10 2015-5-11 TB67S158NG Timing chart of input signal (normal input) CLR DATA SI0 SI1 SI2 SI3 SI4 SI5 SI6 SI7 SI0 SI1 SI2 SI3 SI4 SI5 SI6 SI7 CLK Shift Register Qh Qg Qf Qe Qd Qc Qb Qa Qh Qg Qf Qe Qd Qc Qb QG QF QE QD QC QB QA Qa LATCH Storage Register QH GATE Signal inputted to logic transistors ENB ENB ENB ENB ENB DCC+ BD+ ENB ENB B+ A- ENB A+ *Truth table Input Function CLK DATA CLR LATCH GATE X X X X L Data of ENABLE_X+ and ENABLE_X-: Not applicable X X X X H Data of ENABLE_X+ and ENABLE_X-: Applicable X X L X X Data stored in the storage register is cleared L ↑ H X X The first step of the shift register: ’L’, Others: data of each prior step is stored. H ↑ H X X The first step of the shift register: ’H’, Others: data of each prior step is stored. X ↓ H X X Shift register keeps prior state. X X H ↑ X Data of shift register is stored in the storage register. X X H ↓ X Storage register keeps prior state. Truth table: X=Don’t care * ”X” of ENABLE_X stands for A, B, C, and D. * Note: To operate logic output normally, SCK must be configured low in data transfer and complete. ・Description of logic signal Signal name H L ENABLE_X Output ON Output OFF Motor operation: enable Turn off all functions of the IC STBY Notes When ENABLE_x is set low, output of corresponded channel is turned off (Hi-Z). When STBY is set L, motor output is turned off. (Motor cannot operate). 11 2015-5-11 TB67S158NG 7-2. Function of ALM (output function of thermal shutdown alarm) (Enable in serial/parallel conversion control I/F) ALM output Function H Normal operation L Thermal shutdown alarm function (Thermal_Alarm) ALM pin is a logic output pin of open drain type. It outputs high (pull-up voltage level) in normal state. When the temperature of the IC reaches specified threshold (Thermal_Alarm), low level (GND level) is outputted. Function of ALM is cleared automatically when the temperature of the IC falls 20°C (target value) lower than the threshold of Thermal Alarm. 3.3V or 5V Threshold of ALM detection ON: 120°C (target value) OFF: 30°C (target value) 10kΩ ALM output ALM logic [MOSFET for ALM] ON: In reaching theshold of detection OFF: In normal state and in reaching threshold of release The equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes. 12 2015-5-11 TB67S158NG 8. Absolute maximum ratings (Ta=25°C) Characteristics Symbol Rating Unit VM(max) 80 V Motor output voltage VOUT(max) 80 V Motor output current IOUT(max) 1.5 A Internal logic power supply VCC(max) 6.0 V VIN(H)(max) 6.0 V VIN(L)(min) -0.4 V Open drain output pin (ERR,ALM) voltage range Vod(max) 6.0 V Open drain output pin(ERR,ALM) inflow current range Iod(max) 20 mA PD 1.78 W Operating temperature Topr -20 to 85 °C Storage temperature Tstg -55 to 150 °C Junction temperature Tj(max) 150 °C Motor power supply VM Logic input voltage Power dissipation (Note) SDIP24 Note: Monolithic. When the temperature (Ta) exceeds 25°C, derate the value by 14.2mW/°C. Ta: Ambient temperature of the IC Topr: Ambient temperature of the IC under operation. Tj: Chip temperature of the IC under operation. The maximum of Tj is limited by the temperature of TSD (thermal shutdown circuit). It is recommended to design the IC by considering the maximum of the usage current of 120°C. Absolute maximum ratings The absolute maximum ratings of a semiconductor device are a set of ratings that must not be exceeded, even for a moment. Do not exceed any of these ratings. Exceeding the rating (s) may cause device breakdown, damage or deterioration, and may result in injury by explosion or combustion. The value of even one parameter of the absolute maximum ratings should not be exceeded under any circumstances. The device does not have overvoltage detection circuit. Therefore, the device is damaged if a voltage exceeding its rated maximum is applied. All voltage ratings, including supply voltages, must always be followed. The other notes and considerations described later should also be referred to. ■(For reference) Relation of power dissipation and ambient temperature PD - Ta Monolithic 13 2015-5-11 TB67S158NG 9. Operation ranges (Ta=-20 to 85°C) Characteristics Motor power supply VM Symbol Test condition VM Motor output voltage VOUT Motor output current IOUT Connecting to zener (24V) Ta=25°C per phase Min Typ. Max Unit 10 24 60 V 10 48 60 V - 1.0 1.5 A VIN(H) Logic input high level 2.0 - 5.5 V VIN(L) Logic input low level 0 - 0.8 V Open drain pin voltage range Vod(range) ERR,ALM pin 3.0 - 5.5 V Open drain pin inflow current range Iod(range) ERR,ALM pin - - 10 mA Logic input voltage (Note): Please use the device with extra margin regarding the absolute maximum ratings. 14 2015-5-11 TB67S158NG 10. Electrical characteristics 10-1. DC electrical specifications 1 (Ta=25°C, VM=24V, unless specified otherwise) Characteristics Symbol Test condition Min Typ. Max Unit VIH Logic input voltage High level 2.0 - 5.5 V VIL Logic input voltage Low level GND - 0.8 V (Note 1) 100 - 300 mV Logic input voltage Input hysteresis VIN(HYS) High IIN(H) Logic input voltage High level (VIN=3.3V) - 33 55 μA Low IIN(L) Logic input voltage Low level - - 1 μA Output pins: open, VIN=VIL, Standby mode - 0.7 1.0 mA - 1.3 2.0 mA Logic input current IM1 IM consumption current Output pins: open, Normal operation IM2 Motor output steps: no operation Open drain logic output pin voltage VOL IOL=5mA (output pins: Low) - - 0.5 V VFN VM=24V, IOUT=1.5A, Tj=25°C - 1.2 - V - 0.5 0.7 Ω Regenerative diode Forward voltage Output transistor IOUT=1.5A Drain-Source RON(D-S) Tj=25°C On-resistance (Note 1): VIN (H) is defined as the VIN voltage that causes the outputs to change when the voltage of the test pin is gradually raised from 0 V. VIN (L) is defined as the VIN voltage that causes the outputs to change when the voltage of the pin is then gradually lowered. The difference between VIN (L) and VIN (H) is defined as the input hysteresis. 15 2015-5-11 TB67S158NG 10-2. DC electrical specifications 2 (Ta=25°C, VM=24V, unless specified otherwise) Characteristics Symbol Test condition Min Typ. Max Unit TjTSD - 140 160 170 °C VM recovery voltage VMR - 7.0 8.0 9.0 V Over current detection (ISD) threshold (Note 2) ISD - 1.6 3.0 4.0 A Temperature threshold of thermal shutdown detection (TSD) (Note 1) Note1) About Thermal shutdown (TSD) When the junction temperature of the IC reaches the TSD threshold, the TSD circuit operates and turns off the output transistors. Noise rejection blanking time is provided to avoid misdetection by switching. (As for details, refer to the section of “Blanking time of TSD”.) The IC drives in the standby mode while TSD operates. Once the TSD circuit is triggered, the detect latch signal can be cleared by reasserting the VM power supply, or setting the device to standby mode. The TSD circuit is a backup function to detect a thermal error, therefore it is not recommended to be used aggressively. Note2) About Over-current detection (ISD) When the output current reaches the threshold, the ISD circuit operates and turns off the output transistors. Noise rejection blanking time is provided to avoid misdetection by switching. (As for details, refer to the section of “Blanking time of ISD”.) While ISD operates, the IC drives in the standby mode. After ISD circuit is triggered, the detect latch signal can be cleared by reasserting the VM power supply, or setting the device to standby mode. Back-EMF While a motor is rotating, there is a timing at which power is fed back to the power supply. At that timing, the motor current recirculates back to the power supply due to the effect of the motor back-EMF. If the power supply does not have enough sink capability, the power supply and output pins of the device might rise above the rated voltages. The magnitude of the motor back-EMF varies with usage conditions and motor characteristics. It must be fully verified that there is no risk that the device or other components will be damaged or fail due to the motor back-EMF. Cautions on Overcurrent Shutdown (ISD) and Thermal Shutdown (TSD) The ISD and TSD circuits are only intended to provide temporary protection against irregular conditions such as an output short-circuits; they do not necessarily guarantee the complete IC safety. If the device is used beyond the specified operating ranges, these circuits may not operate properly: then the device may be damaged due to an output short-circuit. The ISD circuit is only intended to provide a temporary protection against an output short-circuit. If such condition persists for a long time, the device may be damaged due to overstress. Overcurrent conditions must be removed immediately by external hardware. IC Mounting Do not insert devices incorrectly or in the wrong orientation. Otherwise, it may cause breakdown, damage and/or deterioration of the device. 16 2015-5-11 TB67S158NG 10-3. AC electrical specifications (Ta=25°C, VM=24V, unless specified otherwise) Characteristics Symbol Logic input frequency fLogic Test condition Min Typ. Max Unit - 1.0 - 150 kHz twp - 700 - - ns twn - 700 - - ns tr - 0.2 0.25 0.3 μs Output transistor tf - 0.2- 0.25 0.3 μs Switching characteristics tpLH Between “Logic” and “OUT” - 1.2 - μs - 1.2 - μs - 2.0 - 2.0 - 4.0 - 8.0 - Minimum clock pulse width tpHL tISD(Mask) Over current detection (ISD) Internal oscillation: 4.0MHz masking time μs tISD Over current detection (ISD) operating time tTSD(Mask) Thermal shutdown detection (TSD) Internal oscillation: 4.0MHz μs masking time Timing chart: Switching characteristics of output transistors twn 90% Logic input signal 50% 50% twp 10% fLogic tpLH tpLH 90% 90% 50% OUT 50% 10% 10% tr tf Figure 1 Logic input and switching characteristics of output transistors Timing charts may be simplified for explanatory purposes. 17 2015-5-11 TB67S158NG 10-4. AC electrical specifications [Serial/Parallel conversion] (Ta = 25°C, VM = 24 V) Characteristics Electrical characteristics Symbol Test condition Min Typ. Max Unit Minimum pulse width tw(H) - 250 - - ns (SCK, RCK, and SI input signals) tw(L) - 250 - - ns tset1 CLR→CLK 50 - - ns DATA→CLK 50 - - ns tset3 CLK→LATCH 50 - - ns tcyc - 500 - - ns thold1 CLK→DATA 50 - - ns Minimum setting up time tset2 AC Cycle time of minimum clock signal (SCK and RCK) Minimum hold time Timing chart: Switching characteristics of output transistors CLR tset1 tw(H) tw(L) CLK thold1 DATA tset2 LATCH tset3 Timing charts may be simplified for explanatory purposes. 18 2015-5-11 TB67S158NG Power consumption of the IC Power consumption of the IC is separated into two; consumed by output transistors and by logic transistors. 1. Power consumption of power transistors (when RON (D-S) = 0.5 Ω) Electrical power of output block is consumed by transistors. Electrical power of the transistors in one motor drive is indicated as follows; P (out) = 2 (number of channels) × Iout (A)2 × Ron (Ω) ...................................................................................... (1) When Ron = 0.5 Ω and Iout = 1.0 A, 2 P (out) = 2 (ch) × 1.0(A) × 0.5 (Ω) ....................................................................................................................... (2) = 1.0(W) 2. Power consumption of logic and IM system It is calculated by separating the states into driving mode and turning off mode. I (IM2) = 2 mA (max) Power consumption can be estimated from below formula. P (IM) = 24 (V) × 0.002 (A) .................................................................................................................................. (3) =0.048 (W) 3. Power consumption Whole power consumption (P) is calculated from the result of the calculations of (2) and (3). P = P (out) + P (IM) = 1.048 (W) As for thermal design for the board, take enough margin to design after evaluating the IC with the actual board. 19 2015-5-11 TB67S158NG 11. Application circuit M 1 24 2 23 3 22 4 21 5 20 6 19 7 18 8 17 9 16 10 15 11 14 12 13 ZD 3.3V or 5V 10kΩ ZD 100μF 24V 0.1μF M The application circuits shown in this document are provided for reference purposes only. It does not guarantee the mass production design. 20 2015-5-11 TB67S158NG 12. Package dimensions P-SDIP24-0723-1.78-001 Unit: mm Weight: 1.4 g (typ.) 21 2015-5-11 TB67S158NG Notes on Contents Block Diagrams Some of the functional blocks, circuits, or constants in the block diagram may be omitted or simplified for explanatory purposes. Equivalent Circuits The equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes. Timing Charts Timing charts may be simplified for explanatory purposes. Application Circuits The application circuits shown in this document are provided for reference purposes only. Thorough evaluation is required, especially at the mass-production design stage. Toshiba does not grant any license to any industrial property rights by providing these examples of application circuits. Test Circuits Components in the test circuits are used only to obtain and confirm the device characteristics. These components and circuits are not guaranteed to prevent malfunction or failure from occurring in the application equipment. IC Usage Considerations Notes on handling of ICs (1) (2) The absolute maximum ratings of a semiconductor device are a set of ratings that must not be exceeded, even for a moment. Do not exceed any of these ratings.Exceeding the rating(s) may cause device breakdown, damage or deterioration, and may result in injury by explosion or combustion. Use an appropriate power supply fuse to ensure that a large current does not continuously flow in the case of overcurrent and/or IC failure. The IC will fully break down when used under conditions that exceed its absolute maximum ratings, when the wiring is routed improperly or when an abnormal pulse noise occurs from the wiring or load, causing a large current to continuously flow and the breakdown can lead to smoke or ignition. To minimize the effects of the flow of a large current in the case of breakdown, appropriate settings, such as fuse capacity, fusing time and insertion circuit location, are required. (3) If your design includes an inductive load such as a motor coil, incorporate a protection circuit into the design to prevent device malfunction or breakdown caused by the current resulting from the inrush current at power ON or the negative current resulting from the back electromotive force at power OFF. IC breakdown may cause injury, smoke or ignition. Use a stable power supply with ICs with built-in protection functions. If the power supply is unstable, the protection function may not operate, causing IC breakdown. IC breakdown may cause injury, smoke or ignition. (4) Do not insert devices in the wrong orientation or incorrectly. Make sure that the positive and negative terminals of power supplies are connected properly. Otherwise, the current or power consumption may exceed the absolute maximum rating, and exceeding the rating(s) may cause device breakdown, damage or deterioration, and may result in injury by explosion or combustion. In addition, do not use any device inserted in the wrong orientation or incorrectly to which current is applied even just once. (5) Carefully select external components (such as inputs and negative feedback capacitors) and load components (such as speakers), for example, power amp and regulator. If there is a large amount of leakage current such as from input or negative feedback condenser, the IC output DC voltage will increase. If this output voltage is connected to a speaker with low input withstand voltage, overcurrent or IC failure may cause smoke or ignition. (The overcurrent may cause smoke or ignition from the IC itself.) In particular, please pay attention when using a Bridge Tied Load (BTL) connection-type IC that inputs output DC voltage to a speaker directly. 22 2015-5-11 TB67S158NG Points to remember on handling of ICs Overcurrent detection Circuit Overcurrent detection circuits (referred to as current limiter circuits) do not necessarily protect ICs under all circumstances. If the overcurrent detection circuits operate against the overcurrent, clear the overcurrent status immediately. Depending on the method of use and usage conditions, exceeding absolute maximum ratings may cause the overcurrent detection circuit to operate improperly or IC breakdown may occur before operation. In addition, depending on the method of use and usage conditions, if overcurrent continues to flow for a long time after operation, the IC may generate heat resulting in breakdown. Thermal Shutdown Circuit Thermal shutdown circuits do not necessarily protect ICs under all circumstances. If the thermal shutdown circuits operate against the over-temperature, clear the heat generation status immediately. Depending on the method of use and usage conditions, exceeding absolute maximum ratings may cause the thermal shutdown circuit to operate improperly or IC breakdown to occur before operation. Heat Radiation Design When using an IC with large current flow such as power amp, regulator or driver, design the device so that heat is appropriately radiated, in order not to exceed the specified junction temperature (Tj) at any time or under any condition. These ICs generate heat even during normal use. An inadequate IC heat radiation design can lead to decrease in IC life, deterioration of IC characteristics or IC breakdown. In addition, when designing the device, take into consideration the effect of IC heat radiation with peripheral components. Back-EMF When a motor rotates in the reverse direction, stops or slows abruptly, current flows back to the motor’s power supply owing to the effect of back-EMF. If the current sink capability of the power supply is small, the device’s motor power supply and output pins might be exposed to conditions beyond the absolute maximum ratings. To avoid this problem, take the effect of back-EMF into consideration in system design. 23 2015-5-11 TB67S158NG RESTRICTIONS ON PRODUCT USE • Toshiba Corporation, and its subsidiaries and affiliates (collectively "TOSHIBA"), reserve the right to make changes to the information in this document, and related hardware, software and systems (collectively "Product") without notice. • This document and any information herein may not be reproduced without prior written permission from TOSHIBA. Even with TOSHIBA's written permission, reproduction is permissible only if reproduction is without alteration/omission. • Though TOSHIBA works continually to improve Product's quality and reliability, Product can malfunction or fail. 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