SLA7027

2-Phase/1-2 Phase Excitation SLA7027MU/SLA7024M/SLA7026M 2-Phase Stepper Motor Unipolar Driver ICs sAbsolute Maximum Ratings Parameter Motor supply voltage FET Drain-Source voltage Control supply voltage TTL input voltage Reference voltage Output current Power dissipation Channel temperature Storage temperature Symbol VCC V DSS VS VIN VREF IO PD1 PD2 Tch Tstg SLA7027MU Ratings SLA7024M 46 100 46 7 2 1.5 4.5 (Without Heatsink) 35 (TC=25°C) +150 −40 to +150 SLA7026M (Ta=25 °C) Units V V V V V A W W °C °C 1 3 sElectrical Characteristics Parameter Symbol min IS Condition Control supply voltage VS VDSS FET Drain-Source voltage Condition VDS FET ON voltage Condition IDSS FET drain leakage current Condition VSD FET diode forward voltage Condition IIH Condition TTL input current IIL Condition V IH TTL input voltage Condition (Active High) VIL Condition V IH TTL input voltage Condition (Active Low) VIL Condition Tr Condition Tstg Switching time Condition Tf Condition Control supply current SLA7027MU typ 10 VS =44V 24 VS =44V, IDSS=250 µA 0.85 ID=1A, AV S=14V 4 V DSS=100V, VS =44V 1.2 ID=1A 40 VIH=2.4V, VS=44V −0.8 V IL=0.4V, VS =44V 2 ID=1A 0.8 VDSS=100V 2 VDSS=100V 0.8 ID=1A 0.5 VS=24V, ID=0.8A 0.7 VS=24V, ID=0.8A 0.1 VS=24V, ID=0.8A ID=1A 0.5 VS =24V, ID=1A 0.7 VS =24V, ID=1A 0.1 VS =24V, ID=1A 2 VDSS=100V 0.8 ID=3A 0.5 V S=24V, ID=1A 0.7 V S=24V, ID=1A 0.1 V S=24V, ID=1A VDSS=100V 2 VDSS=100V 0.8 V 2 ID=1A 0.8 VDSS=100V VIL=0.4V, VS=44V 2 ID=3A 0.8 V VIH =2.4V, VS =44V −0.8 V IL=0.4V, VS =44V ID=1A 40 VIH=2.4V, VS=44V −0.8 VDSS=100V, VS=44V 1.1 ID=3A 40 ID=1A, VS =14V 4 V DSS=100V, VS =44V 2.3 Ratings SLA7024M typ 10 VS=44V 24 VS=44V, IDSS=250µA 0.6 ID=3A, VS=14V 4 SLA7026M typ 10 VS =44V 24 VS =44V, IDSS=250 µA 0.85 Units max 15 44 max 15 44 min max 15 44 min mA V V V mA V 10 100 10 100 10 100 DC characteristics µA mA AC characteristics µs 20 SLA7027MU/SLA7024M/SLA7026M 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SLA7027MU/SLA7024M/SLA7026M sInternal Block Diagram IN B IN A IN A IN B VSA VSB 8 1 6 5 7 12 17 16 18 11 Reg Reg 1, 8, 11, 18pin Description of pins Excitation Active H OUTA OUTA OUT B OUT B input Active L OUTA OUTA OUT B OUT B + – + – + – + – Pin Pin Pin Pin 1 8 11 18 REFA REFB RSA 9 4 2 3 14 13 15 RSB 10 TDA TDB GA sDiagram of Standard External Circuit(Recommended Circuit Constants) Active High VCC (46V max) + GB Excitation signal time chart 2-phase excitation clock IN A IN A IN B IN B 6 5 17 16 INA INA INB INB Active High Vb (5V) 7 12 8 VSA VSB OUTA 1 18 OUTA OUTB 11 OUTB INA INA INB GA 4 INB GB 15 0 H L H L 1 L H H L 2 L H L H 3 H L L H 0 H L H L 1 L H H L r3 r4 r1 2 TdA TdB C1 C2 13 SLA7024M 7026M 7027MU C3 C4 510 Ω 100 Ω (VR) 47k Ω 47k Ω 2.4k Ω 2.4k Ω 470pF 470pF 2200pF 2200pF 1 Ω typ(7024M) (1 to 2W) 0.68 Ω t yp(7026M) 1.8 Ω typ(7027MU) r1 : r2 : r3 : r4 : r5 : r6 : C1 : C2 : C3 : C4 : Rs : 3 L H H L r2 RSA REFA REFB RSB 9 3 14 10 1-2 phase excitation clock IN A IN A IN B IN B 0 H L L L 1 H L H L 2 L L H L 3 L H H L 4 L H L L 5 L H L H 6 L L L H 7 H L L H 0 H L L L 1 H L H L 2 L L H L Rs r5 r6 Rs Active Low VCC (46V max) + Excitation signal time chart 2-phase excitation clock IN A IN A IN B IN B 6 5 17 16 INA INA INB INB Active Low Vb (5V) 7 12 8 1 18 VSA VSB OUTA OUTA OUTB 11 OUTB INA INA INB GA 4 INB GB 15 0 L H L H 1 H L L H 2 H L H L 3 L H H L 0 L H L H 1 H L L H r3 r4 r1 2 TdA TdB 13 C1 C2 SLA7024M 7026M 7027MU C3 C4 r2 RSA REFA REFB RSB 9 3 14 10 1-2 phase excitation clock IN A IN A IN B IN B 0 L H H H 1 L H L H 2 H H L H 3 H L L H 4 H L H H 5 H L H L 6 H H H L 7 L H H L 0 L H H H 1 L H L H 2 H H L H 3 H L L H 510 Ω 100 Ω(VR) 47k Ω 47k Ω 2.4k Ω 2.4k Ω 470pF 470pF 2200pF 2200pF 1Ω typ(7024M) (1 to 2W) 0.68 Ω t yp(7026M) 1.8 Ω typ(7027MU) r1 r2 r3 r4 r5 r6 C1 C2 C3 C4 Rs : : : : : : : : : : : Rs r5 r6 Rs SLA7027MU/SLA7024M/SLA7026M 21 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SLA7027MU/SLA7024M/SLA7026M sExternal Dimensions φ 3.2±0.15 31±0.2 24.4±0.2 16.4±0.2 (Unit: mm) φ 3.2±0.15×3.8 4.8±0.2 1.7±0.1 9.9 ±0.2 6.7±0.5 R-End 0.65 –0.1 +0.2 9.7 –0.5 +1 1 –0.1 17×P1.68±0.4=28.56±1 +0.2 (3) 0.65 –0.1 1 –0.1 0.55 –0.1 4±0.7 +0.2 17×P1.68±0.4=28.56±1 31.3±0.2 1 2 3 · · · · · · · 18 123 · · · · · · · 18 Forming No. No.871 Forming No. No.872 22 SLA7027MU/SLA7024M/SLA7026M 0.55 –0.1 1.6 ±0.6 +0.2 +0.2 +0.2 2.2±0.6 6±0.6 7.5±0.6 3 ±0.6 Part No. Lot No. 2.45±0.2 4.6 ±0.6 3. 4. 5. 16 ±0.2 13 ±0.2 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SLA7027MU/SLA7024M/SLA7026M Application Notes sDetermining the Output Current Fig. 1 shows the waveform of the output current (motor coil current). The method of determining the peak value of the output current (IO) based on this waveform is shown below. (Parameters for determining the output current IO) Vb: Reference supply voltage r1,r2: Voltage-divider resistors for the reference supply voltage RS: Current sense resistor (1) Normal rotation mode IO is determined as follows when current flows at the maximum level during motor rotation. (See Fig.2.) Vb ................................................................ r2 (1) IO ≅ • r1+r2 RS (2) Power down mode The circuit in Fig.3 (rx and Tr) is added in order to decrease the coil current. IO is then determined as follows. IOPD ≅ 1+ 1 r1(r 2+rX) r2 • rX 1 1 r1 tively. Vb R s • I OPD −1 − 1 r2 • Fig. 1 Waveform of coil current (Phase A excitation ON) IO Phase A 0 Phase A Fig. 2 Normal mode Vb(5V) r1 r6 r5 3,(14) C3 9,(10) RS Vb ......................................................... (2) RS r2 Equation (2) can be modified to obtain equation to determine rx. rX= Fig. 3 Power down mode Vb(5V) r1 r6 r5 Fig. 4 and 5 show the graphs of equations (1) and (2) respec- 3,(14) 9,(10) rX Power down signal Tr r2 C3 Fig. 4 Output current IO vs. Current sense resistor R S 4 Fig. 5 Output current IOPD vs. Variable current sense resistor rx 2.0 2 r2 · V b r1+r2 RS r1=510Ω r2=100Ω rx=∞ Vb=5V IO= Output current IOPD (A) Output current IO (A) 3 1.5 RS =0.5Ω 1 · Vb r1(r2+rX) RS 1+ r2 · rX r1=510Ω r2=100Ω Vb=5V IOPD= 1.0 RS =0.8Ω RS =1Ω 1 0.5 0 0 1 2 3 4 00 200 400 600 800 1000 1200 Current sense resistor RS (Ω) Variable current sense resistor rX (Ω) (NOTE) Ringing noise is produced in the current sense resistor RS when the MOSFET is switched ON and OFF by chopping. This noise is also generated in feedback signals from RS which may therefore cause the comparator to malfunction. To prevent chopping malfunctions, r 5(r 6) and C3(C4) are added to act as a noise filter. However, when the values of these constants are increased, the response from RS to the comparator becomes slow. Hence the value of the output current IO is somewhat higher than the calculated value. SLA7027MU/SLA7024M/SLA7026M 23 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SLA7027MU/SLA7024M/SLA7026M sDetermining the chopper frequency Determining T OFF The SLA7000M series are self-excited choppers. The chopping OFF time T OFF is fixed by r3/C1 and r4/C2 connected to terminal Td. T OFF can be calculated using the following formula: Vb Vb The circuit constants and the T OFF value shown below are recommended. T OFF = 12µs at r3=47kΩ, C1=500pF, Vb=5V TOFF≅−r3 • C1rn (1− 2 =−r4 • C2rn (1− 2 ) Fig. 6 Chopper frequency vs. Motor coil resistance 60 15 Chopping frequency f (kHz) 50 ON time TON (µ s) 40 30 20 VC 20 10 0 C =2 4V V 25 30 35 40 =36 VCC 47kΩ r4 500pF C1 = C2 = TOFF =12µs RS =1Ω Lm =1~3ms Rm r3 0 2 4 6 8 10 12 14 16 Motor coil resistance Rm (Ω) sChopper frequency vs. Supply voltage sChopper frequency vs. Output current 50 50 40 40 f (kHz) 20 Motor : 23LM-C202 IO = 0.8A at VCC=24V RS=1Ω f (kHz) 30 30 20 Motor : 23LM-C202 VCC=24V RS=1Ω 10 10 0 0 10 20 30 40 50 0 0 0.2 0.4 0.6 0.8 1.0 VCC (V) IO (A) 24 SLA7027MU/SLA7024M/SLA7026M 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SLA7027MU/SLA7024M/SLA7026M sThermal Design An outline of the method for calculating heat dissipation is shown below. (1) Obtain the value of PH that corresponds to the motor coil current IO from Fig. 7 "Heat dissipation per phase PH vs. Output current IO." Fig. 7 Heat dissipation per phase P H vs. Output current IO SLA7027MU 1.2 (2) The power dissipation Pdiss is obtained using the following formula. 2-phase excitation: Pdiss ≅ 2PH+0.015 ×VS (W) 3 PH+0.015 ×VS (W) 1-2 phase excitation: Pdiss ≅ 2 (3) Obtain the temperature rise that corresponds to the calculated value of Pdiss from Fig. 8 "Temperature rise." SLA7026M 4.0 Heat dissipation per phase PH (W) Heat dissipation per phase PH (W) 1 V 0.6 0.4 1.0 0.2 0 0 0.2 0.4 0.6 0.8 1.0 0 0 Output current IO (A) 1.0 2.0 Output current IO (A) 36 15 V V 24 V ∆T j C ∆T 24 2.0 VC V C 36 V Motor : 23LM-C202 Holding mode 15 V CC =4 4V 0.8 =4 4V 3.0 Motor : 23PM-C503 Holding mode 3.0 Fig. 8 Temperature rise 1.2 Heat dissipation per phase PH (W) SLA7024M 150 1.0 0.8 0.6 0.4 0.2 0 0 V =44 24V 1 ∆Tj–a ∆TC–a (°C) V 36 100 Motor : 23LM-C004 Holding mode 5V VCC Natural cooling Without heatsink 50 0 0.2 0.4 0.6 0.8 Output current IO (A) 1.0 0 1 2 3 Total Power (W) 4 5 Thermal characteristics SLA7027MU 35 30 25 20 15 10 5 0 200 SLA7026M 50 Case temperature rise ∆TC–a (°C) Case temperature rise ∆TC–a (°C) Without heatsink Natural cooling Without heatsink Natural cooling 40 TC ( 4 pin) Motor : PH265-01B Motor current IO=0.8A Ta=25°C VCC=24V, VS=24V 2-phase excitation 30 TC( 4 pin) Motor : 23PM-C705 Motor current IO=1.5A Ta=25°C VCC=24V, VS=24V 2-phase excitation 20 10 500 1K 0 100 500 1K 5K Response frequency (pps) Response frequency (pps) 30 SLA7024M Without heatsink Natural cooling Case temperature rise ∆TC–a (°C) 25 20 TC ( 4 pin) 15 10 5 0 200 Motor : PH265-01B Motor current IO=0.8A Ta=25°C VCC=24V, VS=24V 2-phase excitation 500 1K Response frequency (pps) SLA7027MU/SLA7024M/SLA7026M 25 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SLA7027MU/SLA7024M/SLA7026M sSupply Voltage VCC vs. Supply Current ICC SLA7027MU 500 1.5 SLA7026M Supply current ICC (mA) 400 Supply current ICC (A) 300 Motor : 23LM-C202 1-phase excitation Holding mode IO : Output current IO=1A 1.0 200 Motor : 23PM-C503 1-phase excitation Holding mode IO : Output current IO=3A IO=2A IO=1A 0.5 100 0.4A 0.2A 0 10 20 30 40 50 0 0 10 20 30 0 40 50 Supply voltage VCC (V) Supply voltage VCC (V) SLA7024M 500 Supply current ICC (mA) 400 300 Motor : 23LM-C004 1-phase excitation Holding mode IO : Output current IO=1A 200 100 0 0.5A 0.2A 0 10 20 30 40 50 Supply voltage VCC (V) sNote The excitation input signals of the SLA7027MU, SLA7024M and SLA7026M can be used as either Active High or Active Low. Note, however, that the corresponding output (OUT) changes depending on the input (IN). Active High Input INA (pin6) INA (pin5) INB (pin17) INB (pin16) Corresponding output OUTA (pin1) OUTA (pin8) OUTB (pin11) OUTB (pin18) Active Low Input INA (pin6) INA (pin5) INB (pin17) INB (pin16) Corresponding output OUTA (pin8) OUTA (pin1) OUTB (pin18) OUTB (pin11) 26 SLA7027MU/SLA7024M/SLA7026M