[AP1037] AP1037 Stepper Motor Driver IC equipped with Active Decay Control 1. General Description The AP1037 is driver for bipolar stepper motors. It supports 35V motor power supply and 1.5A constant current operation. The AP1037 can automatically control Decay setting (slow, fast, pre-fast) in the IC inside by AKM original "Active Decay Control". The AP1037 can achieve optimal current setting, therefore will reduce current ripple and bring the motor rotation operation of the high efficiency. The input interface is clock-in method and supports from 2 Phase (full step) to 2W1-2 Phase (1/8step) excitation. In addition, the AP1037 is built-in a regulator for control circuit and capable of driving a motor only by motor power supply voltage (VM), therefore can facilitate design for the application. It is housed in a small QFN package with good heat dissipation performance, therefore the AP1037 is suitable for the stepping motor drive in a space-saving and high current. 2. Features Built-in PWM current control stepper motor driver Single Power Supply Operation Motor Operating Voltage Max Output Current On-Resistance (High+Low) Input Interface Excitation Mode Selectable PWM chopper frequency Spike Noise Blanking Function Power Saving Function Selectable Motor Rotation Direction Corresponding to 3.3V/5V input signal Built-in Charge Pump Circuit Under Voltage Lockout Circuit(UVLO) Thermal Shutdown Circuit (TSD) Over Current Protection Circuit (OCP) Operating Temperature Range Package -30 °C to +85°C AP1037AER: 24-pin QFN (4.0mm□) AP1037AEN: 32-pin QFN (5.0mm□) AP1037AER, AP1037AEN : 1.5A AP1034AER, AP1034AEN : 2.0A MFP/LBP, Scanner, Robotics ATM, Vending machines, Ticket machines, Moneychangers, Point of Sales System (POS) devices and etc. Pin Compatible Lineups Applications 016016726-E-00 Active Decay Control Built-in Regulator for control circuit 8.0 to 35.0V 1.5A 0.95Ω(typ.) @Ta=25℃ Clock-in method 2 Phase (Full step) 1-2 Phase (1/2 step) W1-2 Phase (1/4 step) 2W1-2 Phase (1/8 step) 39kHz/77kHz Without an external noise filter VM Power Consumption is less than10µA (Ta=25°C) Forward/Reverse -1- 2017/01 [AP1037] 3. Table of Contents 1. 2. 3. 4. 5. 6. General Description ....................................................................................................................................1 Features .......................................................................................................................................................1 Table of Contents ........................................................................................................................................2 Block Diagram ............................................................................................................................................3 Ordering Guide ...........................................................................................................................................3 Pin Configurations and Function ................................................................................................................4 Pin Configurations ...............................................................................................................................4 Functions ..............................................................................................................................................5 7. Absolute Maximum Ratings .......................................................................................................................6 8. Recommended Operating Conditions .........................................................................................................7 9. Electrical Characteristics ............................................................................................................................7 10. Functional Descriptions ..............................................................................................................................9 10.1 Input and Output of Terminal ..............................................................................................................9 Truth Table ..........................................................................................................................................9 ENABLEB : Output Enable Terminal ................................................................................................9 SLEEPB : Sleep Mode Setting Terminal .............................................................................................9 RESETB : Home Position Setting Terminal......................................................................................10 MODE1,MODE2 : Motor Excitation Mode Setting Terminal ..........................................................11 STEP : Step Input Terminal ...............................................................................................................11 DIR : Motor Rotation Direction Setting Terminal ...........................................................................12 FS : PWM Chopper Frequency Select Terminal ...............................................................................12 10.2 PWM Constant Current Control ........................................................................................................13 Setting of the Output Current ............................................................................................................13 Active Decay Mode Current Waveform ............................................................................................14 Blanking Time ...................................................................................................................................14 Output Transistor Operating Mode ....................................................................................................14 10.3 Micro-Step Function ..........................................................................................................................15 Step Sequence ....................................................................................................................................15 Example of Current Waveforms in Each Excitation Mode ...............................................................16 10.4 Protection Functions ..........................................................................................................................18 Thermal Shutdown Circuit (TSD) .....................................................................................................18 Under Voltage Lock Output Circuit (UVLO)....................................................................................18 Over Current Protection Circuit (OCP) .............................................................................................19 11. Recommended External Circuit ................................................................................................................20 Recommended External Circuit .........................................................................................................20 Recommended Layout .......................................................................................................................21 12. Package .....................................................................................................................................................22 Outline Dimensions ...........................................................................................................................22 Recommended Land Pattern ..............................................................................................................23 Marking ..............................................................................................................................................24 13. Revise History ...........................................................................................................................................25 IMPORTANT NOTICE .................................................................................................................................26 016016726-E-00 -2- 2017/01 [AP1037] 4. Block Diagram CHL CH CL VM NC VG Imt.VDC Regulator VDC UVLO(VM) CVDC OSC VM Charge Pump High-Side Gate Drive Low-Side Gate Drive Blank Time CVG VM VM1 & PWM Control TSD OCP Active Decay Control OUT1A STEP DIR OUT1B RESETB RESET_B M Transltor MODE1 IS1 MODE2 H-Bridge 1 FS MCU RR1 Control Logic VREF 1／8 RIS1 VM Pre Driver VM2 DAC RR2 IS1 CMP 1 IS2 CMP 2 OUT2A OUT2B ENABLEB IS2 SLEEP_B SLEEPB H-Bridge 2 RIS2 Exposed Pad GND Figure 1. Block Diagram 5. Ordering Guide AP1037AER AP1037AEN 016016726-E-00 -30°C to +85°C -30°C to +85°C 24-pin QFN 32-pin QFN -3- 2017/01 [AP1037] 6. Pin Configurations and Function Pin Configurations 12 20 11 17 18 19 20 21 22 24 19 23 AP1037AEN : 32-pin QFN 13 14 15 16 17 18 AP1037AER: 24-pin QFN 25 16 26 15 27 9 Exposed pad 8 7 6 5 4 3 1 -4- 10 9 32 6 5 4 3 2 11 31 7 1 12 30 Exposed pad 24 13 Top View 29 8 23 016016726-E-00 AP1037AEN 28 Top View 22 14 10 AP1037AER 2 21 2017/01 [AP1037] Functions Pin Number 24QFN 32QFN 1 1 Pin Name I/O Function OUT2B O ENABLEB I 2 5 GND P 3,16 6,19 CL I 4 7 CH I 5 8 VG O 6 9 H-bridge 2 Output Terminal Output Enable Terminal Please refer to Section10.1. Ground Terminal Connect Terminal for Charge Pump Capacitor Connect Terminal for Charge Pump Capacitor Connect Terminal for Stabilizing Capacitor VDC O 7 10 Internal Regulator Output Terminal MODE1 I 8 11 MODE2 I 9 12 RESETB I 10 13 FS I 11 14 SLEEPB I 12 15 STEP I 14 17 VREF I 15 18 DIR I 17 20 OUT1B O 18 24 VM1 P 19 22 IS1 OUT1A OUT2A IS2 I O O I 20 21 22 23 25 27 30 32 VM2 P 24 3 Motor Excitation Mode Setting Terminal Please refer to Section10.1. Motor Excitation Mode Setting Terminal Please refer to Section10.1. Reset Input Terminal Please refer to Section10.1. Chopper Frequency Select Terminal Please refer to Section10.1. Sleep Mode Input Terminal Please refer to Section10.1. Step Input Terminal Please refer to Section10.1. Input Terminal of Reference Voltage of PWM Constant Current Control Motor Rotate Direction Setting Terminal Please refer to Section10.1. H-bridge1 Output Terminal H-bridge1 Power Supply Terminal Please connect VM2 terminal in the system board. H-bridge1 Current Sense Terminal H-bridge1 Output Terminal H-bridge2 Output Terminal H-bridge2 Current Sense Terminal H-bridge2 Power Supply Terminal Please connect VM1 terminal in the system board. 2,4,16,2 NC 13 1,23,26, No Connection Terminal 28,29,31 Ground Terminal Exposed Please connect GND terminal in the system Pad board. Note 1. I (Input terminal), O (Output terminal), P (Power terminal) 016016726-E-00 -5- Note Not connect external node 150kΩ pull-down 50kΩ pull-down 100kΩ pull-down 100kΩ pull-down 100kΩ pull-down For heat dissipation 2017/01 [AP1037] 7. Absolute Maximum Ratings Parameter Motor Power Supply Voltage Digital Input/Output Terminal Voltage (STEP, DIR, RESETB, MODE1, MODE2, ENABLEB, SLEEPB, FS) VM Level Terminal Voltage (OUT1A,OUT1B, OUT2A,OUT2B) Symbol min max Unit VM -0.5 35 V Vterm1 -0.5 5.5 V Vterm2 -0.5 VM V Condition VM VM The Min value must not V -0.5 +5.5 exceed -0.5V. VDC Terminal Voltage VDC -0.4 5.5 V VREF Input Voltage VREF -0.5 VDC V CL Terminal Voltage VCL -0.5 VDC V IS1,IS2 Terminal Voltage ISn -0.5 1.5 V Output Current Iload 2.0 A (Note 3,Note 4) 3.9 W Ta=25°C (Note 4, Note 5) 32QFN PD1 2.0 W Ta=85°C (Note 4, Note 5) Power Dissipation Ta=25°C (Note 4, Note 5) 3.1 W 24QFN PD2 Ta=85°C (Note 4, Note 5) 1.6 W Junction Temperature Tj 150 °C Storage Temperature Tstg -40 150 °C Note 2. All above voltages are with respect to GND. The each power supply of VC and VM is sequence-free. Note 3. For Power Dissipation, the output current rating may be limited by duty cycle, Ta, and PCB board heat sinking design. Note 4. Exposed Pad must be connected to GND. Note 5. A 4-layer JEDEC51 compliant board is used. If the temperature exceeds 25°C, be sure to derate at Figure 2. 24-pin QFN: θJA =40°C /W 32-pin QFN: θJA =32°C /W VG,CH Terminal Voltage Vterm3 WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal operation is not guaranteed at these extremes. 4.5 4.0 Power dissipation, Pd ( W) 3.5 3.0 32QFN RθJA=32°C/W at 4-layer PCB 2.5 2.0 24QFN 1.5 RθJA=40°C/W at 4-layer PCB 1.0 0.5 0.0 -30 -25 0 25 50 75 85 100 Temperature (°C) 125 150 175 Figure 2. Maximum Power Dissipation 016016726-E-00 -6- 2017/01 [AP1037] 8. Recommended Operating Conditions Parameter Symbol min typ max Unit Note Motor Power Supply Voltage VM 8.0 24.0 35.0 V Maximum Output Current Iload 1.5 A (Note 6) (Continuous) Reference Voltage of VREF 0.0 3.6 V Iload(100%)[A]=(VREF/8)/RISn PWM Constant Current Control Operating Temperature Range Ta -30 85 °C Note 6. Please have a thermal design so as not exceed Tj = 150 degrees and Power Dissipation. Note 7. All voltages are with respect defined to GND (Exposed-Pad). 9. Electrical Characteristics Parameter (Ta = 25°C, VM=24V, unless otherwise specified.) Condition min typ max Unit Symbol Quiescent Current IVM ENABLEB=”L” SLEEPB=”H” - - 12.0 mA IVMOFF ENABLEB=”H” SLEEPB=”H” - - 7.0 mA IVMPSV SLEEPB=”L” SLEEP MODE - 10 30 µA Driver On Resistance RON Iload = 1.12A - 0.95 1.28 Ω Body Diode Forward Voltage VF IF = 0.1A - 0.8 1.2 V VM Quiescent Current H-bridge Circuit Interface Input High Level Voltage VIH 2.0 - - V Input Low Level Voltage VIL - - 0.8 V 0.2 0.4 Input Hysteresis (Note 9) Vhys STEP, DIR, RESETB, MODE1,MODE2,ENABLEB V Input Pulse Rise Time tR - - 1.0 µs Input Pulse Fall Time tF - - 1.0 µs Input High Level Current IIH STEP,DIR, ENABLEB 5.5V applying -1.0 - 1.0 µA Input Low Level Current IIL 0V applying -1.0 - 1.0 µA 0 - 3.6 V -3 - 3 µA Reference Voltage VREF Input Voltage Range VREF VREF Input Current IVREF 016016726-E-00 VREF=2V -7- 2017/01 [AP1037] Parameter (Ta = 25°C, VM=24V, unless otherwise specified.) Condition min typ max Unit Symbol Current Operation Blanking Time PWM Chopper Frequency Output Current Accuracy tB FS=”L” 1.3 2.6 5.2 µs fCP1 FS=”L” 20 39 60 kHz fCP2 FS=”H” 40 77 120 kHz VREF=2V, %IloadMAX=38% -15 - +15 % VREF=2V, %IloadMAX=71% -5 - +5 % VREF=2V, %IloadMAX=100% -5 - +5 % 2.0 3.9 7.5 A 7.5 A errIload Protection Circuit Overcurrent protection trip level (High-side) IOCPTRIP_H Overcurrent protection trip level (Low-side) IOCPTRIP_L 1.6 Ris=0.20Ω~0.30Ω Overcurrent protection deglitch time tOCPDET 3.0 6.8 23.3 µs Under Voltage Detect Voltage (UVLO) VMUVLO 5.7 6.35 7.0 V (Note 9) 150 175 200 °C Temperature Hysteresis TTSDHYS (Note 9) Note 8. All above voltages are with respect to GND. Note 9. Not tested in production. 20 30 40 °C Thermal Shut Down Temperature TTSD (Ta = 25°C, VM=24V, unless otherwise specified.) Symbol min typ max Unit Parameter STEP Signal “H” Level Time tWH(STEP) 1.0 - - µs STEP Signal “L” Level Time tWL(STEP) 1.0 - - µs DIR, MODEx Signal Setup Time tS(STEP) 200 - - ns DIR, MODEx Signal Hold Time tH(STEP) 200 - - ns tWH(STEP) tWL(STEP) STEP tS(STEP) tH(STEP) DIR,MODE1,MODE2 Figure 3. Timing Chart 016016726-E-00 -8- 2017/01 [AP1037] 10. Functional Descriptions 10.1 Input and Output of Terminal Truth Table Table 1. Output state against SLEEPB, RESETB and ENABLEB settings OUT1A OUT1B SLEEPB RESETB ENABLEB Condition OUT2A OUT2B Output OFF Output OFF Sleep mode L X X (Hi-Z) (Hi-Z) Internal control circuit : OFF Output OFF Output OFF Home Position Setting H L X (Hi-Z) (Hi-Z) Internal control circuit : ON Output OFF Output OFF Disable mode H H H (Hi-Z) (Hi-Z) Internal control circuit : ON Enable mode H H L Output On Output On DIR=”H” : CW DIR=”L” : CCW Note 10. X : Don’t Care ENABLEB : Output Enable Terminal When the input is “H”, this pin turns off all the H-bridge outputs (motor output becomes Hi-Z). When the input is “L”, all H-bridge outputs become enable. At that time, the input of sequencer (STEP,DIR,MODE1,MODE2) is independent of the logic of enable. ENABLEB input is the function of making H-Bridge output off. During output is off, the input of sequencer (STEP,DIR,MODE1,MODE2) is hold. Refer to Figure 4. Table 2. Settings of output enable terminal ENABLEB L H Condition Operating mode Output Hi-Z (Electrical angle hold) SLEEPB : Sleep Mode Setting Terminal When the input is “L”, this pin sets the IC in sleep mode, and turns off all the H-bridge outputs, internal regulator, and charge pump circuit (motor output becomes Hi-Z). Control circuit is reset. If the “H” is input, the sleep mode is canceled. After the sleep mode is canceled, it restarts from the home position (Table 9). STEP input cannot be input during 3msec(max) after the sleep mode is canceled, to wait for the stable operation of internal charge pump. Refer to Figure 5. Table 3. Settings of sleep mode terminal SLEEPB L H 016016726-E-00 Condition SLEEP mode (Output : Hi-Z) Operating mode -9- 2017/01 [AP1037] Max3.0ms STEP STEP IOUT1 0% IOUT2 0% IOUT1 0% IOUT2 0% SLEEPB ENABLEB ENABLEB RESETB Figure 4. ENABLEB signal Timing Chart (W1-2 phase) Figure 5. Sleep Mode Cancel Timing Chart (W1-2 phase) RESETB : Home Position Setting Terminal When the RESETB input is “H”, the sequencer is set at home position, and all the H-bridge outputs become off (motor output becomes Hi-Z). In this case, STEP input is ignored until “H” is input to the RESETB terminal. The internal circuits are in enable state. Refer to Figure 6. Table 4. Settings of home position terminal RESETB L H Condition Output : Hi-Z (Home Position) Operating mode STEP IOUT1 0% IOUT2 0% RESETB Figure 6. RESETB signal Timing Chart (W1-2 phase) 016016726-E-00 - 10 - 2017/01 [AP1037] MODE1,MODE2 : Motor Excitation Mode Setting Terminal The MODE1 and MODE2 terminals are used to configure stepping format as shown below. Table 5. Settings of MODE terminals that excite motor MODE1 MODE2 L L H L L H H H Excitation mode 2 phase (Full step) 1-2 phase (1/2step) W1-2 phase (1/4step) 2W1-2phase (1/8step) STEP : Step Input Terminal The sequencer operates at the rising edge of the STEP input, electrical angle will proceed one at each step. Please design the pattern such that there is no jump of noise in STEP input terminal. Table 6. Step excitation state against STEP input STEP Rising Edge Falling Edge 016016726-E-00 Condition Sends excitation step Hold excitation step - 11 - 2017/01 [AP1037] DIR : Motor Rotation Direction Setting Terminal This pin sets the direction of motor rotation. When changing the direction, a new setting is reflected on a rising edge of the CLK pin. Refer to Figure 7. ・CCW : H-bridge2 current is output by shifting 90deree ahead against the H-bridge1 current. ・CW : H-bridge2 current is output by shifting 90degree behind against the H-bridge1 current. Table 7. Settings of rotate direction of motor DIR L H Condition CCW (Reverse) CW (Forward) STEP IOUT1 0% IOUT2 0% DIR CW CCW CW Figure 7. DIR signal Timing Chart (W1-2 phase) FS : PWM Chopper Frequency Select Terminal By inputting “H” to the FS input, it is possible to drive the PWM chopper frequency in 77kHz (typ). By inputting “L” or connecting GND, PWM chopper frequency becomes 39kHz (typ). Please decide the setting of the FS input “50us” before than the ENABLEB input is set to "L". Table 8. Settings of PWM chopper frequency select terminal FS Condition L fCP=39kHz(typ) H fCP=77kHz(typ) 016016726-E-00 - 12 - 2017/01 [AP1037] 10.2 PWM Constant Current Control Setting of the Output Current The frequency of the internal OSC circuit is used to drive a stepper motor in PWM constant current controlling. The maximum current value (Setting Current = Trip Current) is determined by a sense resistance (RIS) for sensing current and the input voltage to the VREF pin (VREF). Iload (100%) [A]= (VREF /8) / RIS VREF : PWM constant current setting voltage RIS : H-Bridge sense resistor VREF damping ratio : 1/8 Calculation example1：VREF=2.4V, RIS=0.24ohm Iload (100%)[A] = (2.4 / 8) / 0.24ohm = 1.25A Please use the resistance that is smaller than a resistance value to show in below for current sense resistance. Figure 8. Recommended Sense Resistor 016016726-E-00 - 13 - 2017/01 [AP1037] Active Decay Mode Current Waveform The AP1037 selects the decay mode automatically for better current follower performance. Usually, it operates in slow decay mode but changes to fast decay mode when switching the step during current decreasing period. Also there is Pre fast decay mode before Charge mode. Therefore if in the low target current, it is possible to reduce the current distortion. ① ① ② ③ ④ ② ③ ① ② ③① ② ③① ④ ② ③① ② ③① ② ③ Charge Slow decay Pre fast decay Fast decay Iload (100%) Mottor Current Chopper Frequency(fCP) Blanking Time (tB) Figure 9. Active Decay Mode Current Waveform Blanking Time Recovery current of parasitic diode arises when the decay mode changes charge mode during PWM constant current operation. It can flow into current sense resistor, and the noise of current sense terminal (IS1,IS2) cause the malfunction of internal comparator (CMP1,CMP2) . To prevent malfunction, the detection of current sense comparator is blanking during Charge mode. The blanking time of the IC is 2.6us fixed at FS=L, 1.3us fixed at FS=H. Output Transistor Operating Mode ● Charge mode ● Slow decay mode ● Pre Fast decay mode ● Fast decay mode ON OFF OFF OFF OFF ON OFF OFF OFF ON ON ON ON OFF ON OFF Figure 10. Current Flow of Mixed Decay Mode 016016726-E-00 - 14 - 2017/01 [AP1037] 10.3 Micro-Step Function Step Sequence Table 9. Setting Current Comparison of Excitation Modes 2 phase (Full step) 1-2 phase (1/2step) W1-2 phase (1/4step) 1 1 2W1-2 phase (1/8step) Phase1 Current [%Iloadmax] 100 98 92 83 71 56 38 20 0 -20 -38 -56 -71 -83 -92 -98 -100 -98 -92 -83 -71 -56 -38 -20 0 20 38 56 71 83 92 98 Phase2 Current [%Iloadmax] 0 20 38 56 71 83 92 98 100 98 92 83 71 56 38 20 0 -20 -38 -56 -71 -83 -92 -98 -100 -98 -92 -83 -71 -56 -38 -20 Step Angle [°] 1 0.00 2 11.25 2 3 22.50 4 33.75 1 2 3 5 45.00 6 56.25 4 7 67.50 8 78.75 3 5 9 90.00 10 101.25 6 11 112.50 12 123.75 2 4 7 13 135.00 14 146.25 8 15 157.50 16 168.75 5 9 17 180.00 18 191.25 10 19 202.50 20 213.75 3 6 11 21 225.00 22 236.25 12 23 247.50 24 258.75 7 13 25 270.00 26 281.25 14 27 292.50 28 303.75 4 8 15 29 315.00 30 326.25 16 31 337.50 32 348.75 : Home micro-step position at Step Angle 45° Note 11. When the excitation mode is changed to a coarser mode, it is set to the closest position in the rotate direction set by DIR signal. However, the motor could step-out or misstep depends on the operation state of motor during switching time. The changing sequence of the excitation mode should be determined by adequate evaluation. Table 10. When changing to 2phase excitation mode at eighth position from 2W1-2phase excitation mode Before After DIR 2W1-2 2phase(4step) H 8step position 2step position L 8step position 1step position 016016726-E-00 - 15 - 2017/01 [AP1037] Example of Current Waveforms in Each Excitation Mode STEP STEP +100% +100% +71% +71% IOUT1A 0% IOUT1A 0% -71% -71% -100% -100% +100% +100% +71% +71% IOUT2A 0% IOUT2A 0% -71% -71% -100% -100% : Home position : Home position 2 phase (CW mode：DIR=”H”) 1-2 phase (CW mode：DIR=”H”) STEP +100% +92% +71% +38% IOUT1A 0% -38% -71% -92% -100% +100% +92% +71% +38% IOUT2A 0% -38% -71% -92% -100% : Home position W1-2 phase (CW mode：DIR=”H”) 016016726-E-00 - 16 - 2017/01 [AP1037] STEP 100% 98% 92% 83% 71% 56% 38% 20% IOUT1A 0% -38% -71% -100% 100% 98% 92% 83% 71% 56% 38% 20% IOUT2A 0% -38% -71% -100% Home position 2W1-2 phase (CW mode：DIR=”H”) Note 12. “+” means the current is flowing through the OUT1B from OUT1A and the OUT2B from OUT2A. 016016726-E-00 - 17 - 2017/01 [AP1037] 10.4 Protection Functions Table 11. Recovery type and the output state of the protection circuit Protection Circuit H-Bridge Outputs Thermal Shutdown (TSD) Hi-Z Under Voltage Lockout (UVLO) Hi-Z Shorted-Load Over Current Protection Shorted-to-Ground Hi-Z (OCP) Shorted-to-Power Recovery type Automatic Automatic Latch off Thermal Shutdown Circuit (TSD) If the internal temperature of the IC (Tj) reaches 175 °C (typ), the H-Bridge outputs Hi-Z. In addition, it will automatically return to the normal operation when it becomes less than 145 °C (typ). TTSDHYS TTSD+TTSDHYS TJ TTSD VOUT ON OFF(HI-Z) ON Figure 11. TSD Timing Chart Under Voltage Lock Output Circuit (UVLO) When VM voltage is lower than 6.35V (typ), the H-Bridge output is the Hi-Z. Please note that this circuit does not operate during sleep mode. When UVLO operates, internal circuits which includes H-Bridge output, internal regulator, charge pump circuit become disable, and also the control circuit is reset (initialize). If VM voltage goes up than the specified voltage, UVLO is released. After the UVLO released, it restarts from the home position. STEP input cannot be input during 3msec after the UVLO is canceled, to wait for the stable operation of internal charge pump. VM VMHYS=0.5V(typ) VMUVLO VOUT 3ms(max) ON OFF(Hi-Z) ON Figure 12. UVLO Timing Chart 016016726-E-00 - 18 - 2017/01 [AP1037] Over Current Protection Circuit (OCP) The IC has over current protection circuit to prevent breakdown of H-Bridge drivers. If the specified current flows, H-Bridge outputs of all channel becomes latch off. It recovers by re-input of the motor power supply voltage (VM) or input of SLEEPB or RESETB. IOCPTRIP IOUT tOCPDET VOUT ON tOCPDET OFF(HI-Z) OFF(HI-Z) VM SLEEPB or RESETB Figure 13. OCP Timing Chart Note13. If latch is released under the abnormal condition after OCP operation, the IC may repeat the operation(latch → return → latch) . This will be the cause of heat generation and deterioration of the IC. In addition, please do not make chattering noise for SLEEPB or RESETB signal because it causes the malfunction of the OCP circuit and may let an IC damage. Note14. When the Shorted-Load or the Shorted-to-Power occurs, the current comparison comparator works. After the blanking time, the IC becomes slow decay mode and repeats normal operation every chopper cycle. Note15. If the current sense resistors(RIS) are shorted, the OCP operates before the current comparator comparison works in all conditions, so that the output of all channels will be Hi-Z. Note16. Low side OCP detects overcurrent by comparing the voltage drop across a current sense resistor (RIS) corresponding to the load current with the reference voltage. It should be noted that the overcurrent threshold will be increased using a low value sense resistor. 016016726-E-00 - 19 - 2017/01 [AP1037] 11. Recommended External Circuit Recommended External Circuit VM CVM CVM1 VDC CVDC CVG CVM2 VM2 VM1 CHL VG CH CL OUT1A OUT1B M AP1034 AP1037 RR1 VREF OUT2A RR2 OUT2B IS1 RIS1 IS2 RIS2 GND FS Exposed Pad MODE1 ENABLE_B MODE2 SLEEP_B STEP DIR RESET_B MCU Figure 14. Recommended External Circuit Table 12. Recommended External Components Items typ Unit 備考 CVM 100 Electrolytic Capacitor µF CVM1 0.22 Ceramic Capacitor µF CVM2 0.22 Ceramic Capacitor µF CHL 0.01 Ceramic Capacitor µF CVG 0.1 Ceramic Capacitor µF CVDC 0.22 Ceramic Capacitor µF RIS1 0.24 Ω At 1.25[A]setting (@VREF=2.38V) RIS2 0.24 Ω At 1.25[A]setting (@VREF=2.38V) RR1 33 kΩ At VREF=2.38V setting (@VC=5.0V) RR2 30 kΩ At VREF=2.38V setting (@VC=5.0V) Note 17. Above values are examples. Please choose appropriate external components for your system board. Note 18. Capacitance of CVM and CVC should be determined in consideration of the load current profile, the load capacitance, the line resistance and etc. of the actual system board. 016016726-E-00 - 20 - 2017/01 [AP1037] Recommended Layout Top View Bottom View Figure 15. Recommended Layout Pattern Note 19. Please layout the large ground plane on the PCB. Note 20. Exposed Pad (heat sink) is common to the ground terminal. Please connect it to the ground of the PCB. Note 21. The ground via of the PCB back side under IC mounted area is effective for heat radiation to each layer of the PCB. 016016726-E-00 - 21 - 2017/01 [AP1037] 12. Package Outline Dimensions AP1037AER : 24-pin QFN Package Unit : mm AP1037AEN : 32-pin QFN Package Unit : mm 016016726-E-00 - 22 - 2017/01 [AP1037] Recommended Land Pattern AP1037AER ： 24-pin QFN Package 4.6 3.0 0.22±0.05 2.6 3.0 4.6 2.6 φ0.3 Thermal Via 0.2 【unit: mm】 AP1037AEN： 32-pin QFN Package 【unit: mm】 *The most suitable dimensions of the mount pad change by a substrate material, solder paste materials, a soldering method, device precision. It is therefore recommended that customers contact the actual design should be optimized according to the situation. 016016726-E-00 - 23 - 2017/01 [AP1037] Marking AP1037AER 1037AR (2) YWWAA (3) (1) (4) (5) (1) (2) (3) (4) (5) 1pin Indication Market No. Year code (last 1 digit) Week code Management code (1) (2) (3) (4) (5) 1pin Indication Market No. Year code (last 1 digit) Week code Management code AP1037AEN 1037AN (2) YWWAA (1) 016016726-E-00 (3) (4) (5) - 24 - 2017/01 [AP1037] 13. Revise History Date (YY/MM/DD) 17/02/02 016016726-E-00 Revision Page Contents 00 - First Edition - 25 - 2017/01 [AP1037] IMPORTANT NOTICE 0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the information contained in this document without notice. When you consider any use or application of AKM product stipulated in this document (“Product”), please make inquiries the sales office of AKM or authorized distributors as to current status of the Products. 1. All information included in this document are provided only to illustrate the operation and application examples of AKM Products. AKM neither makes warranties or representations with respect to the accuracy or completeness of the information contained in this document nor grants any license to any intellectual property rights or any other rights of AKM or any third party with respect to the information in this document. You are fully responsible for use of such information contained in this document in your product design or applications. AKM ASSUMES NO LIABILITY FOR ANY LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM THE USE OF SUCH INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS. 2. The Product is neither intended nor warranted for use in equipment or systems that require extraordinarily high levels of quality and/or reliability and/or a malfunction or failure of which may cause loss of human life, bodily injury, serious property damage or serious public impact, including but not limited to, equipment used in nuclear facilities, equipment used in the aerospace industry, medical equipment, equipment used for automobiles, trains, ships and other transportation, traffic signaling equipment, equipment used to control combustions or explosions, safety devices, elevators and escalators, devices related to electric power, and equipment used in finance-related fields. Do not use Product for the above use unless specifically agreed by AKM in writing. 3. Though AKM works continually to improve the Product’s quality and reliability, you are responsible for complying with safety standards and for providing adequate designs and safeguards for your hardware, software and systems which minimize risk and avoid situations in which a malfunction or failure of the Product could cause loss of human life, bodily injury or damage to property, including data loss or corruption. 4. Do not use or otherwise make available the Product or related technology or any information contained in this document for any military purposes, including without limitation, for the design, development, use, stockpiling or manufacturing of nuclear, chemical, or biological weapons or missile technology products (mass destruction weapons). When exporting the Products or related technology or any information contained in this document, you should comply with the applicable export control laws and regulations and follow the procedures required by such laws and regulations. The Products and related technology may not be used for or incorporated into any products or systems whose manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations. 5. Please contact AKM sales representative for details as to environmental matters such as the RoHS compatibility of the Product. Please use the Product in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances, including without limitation, the EU RoHS Directive. AKM assumes no liability for damages or losses occurring as a result of noncompliance with applicable laws and regulations. 6. Resale of the Product with provisions different from the statement and/or technical features set forth in this document shall immediately void any warranty granted by AKM for the Product and shall not create or extend in any manner whatsoever, any liability of AKM. 7. This document may not be reproduced or duplicated, in any form, in whole or in part, without prior written consent of AKM. 016016726-E-00 - 26 - 2017/01