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| MITSUMI 4ch Moter driver IC for Portable CD Player 4-ch Motor Driver for Portable CD Players Monolithic IC MM1538 Outline This driver IC contains a 4ch H bridge driver and DC-DC converter control circuit on one chip, and was developed for use in portable CD players. QFP-44 is used for the package, making it ideal for smaller sets. Features (1) Built-in 4ch H bridge driver, and PWM control of load drive voltage is made possible by external components. (2) DC-DC converter control circuit on chip. (3) With reset output inversion output pin. (4) Empty detection level can be switched between rechargeable battery and dry battery. (5) Constant current charging; current value can be varied using external resistor. (6) Built-in power transistor for charging. (7) Built-in independent thermal shutdown circuit. Package QFP-44 Applications Portable CD radio cassette recorders MITSUMI 4ch Moter driver IC for Portable CD Player Block Diagram RCHG OUTIR OUT1F OUT2R OUT2F POWGND OUT3F OUT3R OUT4F OUT4R BRAKE1 33 32 31 30 29 28 27 26 25 24 23 BRAKE1 AMUTE 34 MUTE2 BTL BTL TSD PSW 37 MAXIMUM DETECTION CLK 38 CLK BTL BTL V / I V / I V / I POWER OFF STARTER V / I MUTE34 CONTROL CIRCUIT POWER SUPPLY TSD OVER-VOLTAGE TRIANGLE WAVE PRE-DRIVER POWER SUPPLY POWER UNIT POWER SUPPLY 22 IN1 EMP 35 21 MUTE2 HVcc 36 20 IN2 19 MUTE34 18 IN4 START 39 17 IN3 OFF 40 16 Vref 15 VSYS2 CHGVcc 41 SEL 42 14 OP+ PREGND 43 13 OPOUT PWMFIL 44 12 VSYS1 1 BSEN 2 BATT 3 RESET 4 DEAD 5 SW 6 EO 7 EI 8 SPRT 9 CT 10 N.C. 11 OP- MITSUMI 4ch Moter driver IC for Portable CD Player Pin Assignment RCHG OUT1R OUT1F OUT2R OUT2F POWGND OUT3F OUT3R OUT4F OUT4R BRAKE1 33 32 31 30 29 28 27 26 25 24 23 AMUTE 34 EMP 35 HVCC 36 PSW 37 CLK 38 START 39 OFF 40 CHGVCC 41 SEL 42 PREGND 43 PWMFIL 44 22 IN1 MUTE2 IN2 MUTE34 IN4 IN3 Vref VSYS2 OP+ OPOUT VSYS1 21 20 19 18 MM1538XQ 17 16 15 14 13 12 1 2 3 4 5 6 7 8 9 10 11 BSEN BATT RESET DEAD SW EO EI SPRT CT N.C. OP- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 BSEN BATT RESET DEAD SW EO EI SPRT CT N.C. OPVSYS1 OPOUT OP+ VSYS2 Vref IN3 IN4 MUTE34 IN2 MUTE2 IN1 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 BRAKE1 OUT4R OUT4F OUT3R OUT3F POWGND OUT2F OUT2R OUT1F OUT4R RCHG AMUTE EMP HVCC PSW CLK START OFF CHGVCC SEL PREGND PWMFIL MITSUMI 4ch Moter driver IC for Portable CD Player Pin Description Pin No. 1 Pin Name Input/Output BSEN Input Function Battery Voltage Monitor 1 71k 20k 10.5k 14.85k Internal Equivalent Circuit 16.5k 2 BATT Input Battery Power Supply Input Power Supply 3 RESET Output Reset Detect Output VSYS1 90k 3 4 DEAD Input DEAD Time Setting 13k 4 49k 30.8k 5 SW Output Transistor Drive For Voltage Multiplier 5 BATT 150 6k 6 EO Output Error Amplifier Output VSYS1 6 MITSUMI 4ch Moter driver IC for Portable CD Player Pin Description Pin No. 7 Pin Name Input/Output EI Input Function Error Amplifier Input VSYS1 35k 7 21.6k Internal Equivalent Circuit 8 SPRT Output Short Circuit Protection Setting VSYS1 8 220k 9 CT Output Triangular-Wave Output VSYS1 BATT 2k 9 420k 10k 10 N.C. 11 14 OPOP+ Input Op Amp Negative Input Op Amp Positive Input 14 11 12 VSYS1 Input Control Circuit Power Supply Input Control Circuit Power Supply 13 OPOUT Output Op Amp Output VSYS1 13 MITSUMI 4ch Moter driver IC for Portable CD Player Pin Description Pin No. 15 Pin Name Input/Output VSYS2 Input Function Driver Pre-step Power Supply Internal Equivalent Circuit Pre-Drive Power Supply 16 Vref Input Reference Voltage Input 200 16 24k 50k 4 17 18 20 22 IN3 IN4 IN2 IN1 Input ch3 Control Signal Input ch4 Control Signal Input ch2 Control Signal Input ch1 Control Signal Input 17 18 20 22 20PIN=7.5k 11k 19 21 23 MUTE34 MUTE2 BRAKE1 Input ch3 and 4 Mute ch2 Mute ch1 Brake 68k 19 21 23 68k 24 25 26 27 29 30 31 32 28 36 OUT4R OUT4F OUT3R OUT3F OUT2F OUT2R OUT1F OUT1R POWGND HVCC Output ch4 Negative Output ch4 Positive Output ch3 Negative Output ch3 Positive Output ch2 Positive Output ch2 Negative Output ch1 Positive Output ch1 Negative Output Power Block Power Supply Ground 24 26 30 32 36 25 27 29 31 Input H-Bridge Power Supply Input 28 33 RCHG Input Charge Current Setting 950 33 MITSUMI 4ch Moter driver IC for Portable CD Player Pin Description Pin No. 34 Pin Name Input/Output AMUTE Output Function Reset Invert Output 34 95k Internal Equivalent Circuit BATT 35 EMP Output Empty Detect Output 35 37 PSW Output PWM Transistor Drive 37 BATT 50 38 CLK Input External Clock Synchronizing Input 38 VSYS1 2k 50k 100k 39 START Input Voltage Multiplier DC-DC Converter Start 39 200k 390k BATT 40 OFF Input Voltage Multiplier DC-DC Converter OFF VSYS1 180k 40 27k MITSUMI 4ch Moter driver IC for Portable CD Player Pin Description Pin No. 41 Pin Name Input/Output CHGVCC Input Function Charging Circuit Power Supply Input 42 SEL Input Output Empty Detect Level Switch BATT 200k Internal Equivalent Circuit Charging Circuit Power Supply 130k 42 15k 43 PREGND Pre Section Power Supply Ground Pre Section Power Supply Ground 44 PWMFIL Input PWM Phase Compensation VSYS1 2k 44 2k * The positive and negative outputs are the polarity with respect to the input MITSUMI 4ch Moter driver IC for Portable CD Player Absolute Maximam Ratings Item Supply Voltage Driver Output Current Power Dissipation Operating Temperature Storage Temperature (Ta=25C) Symbol VCC *1 IO Pd TOPR TSTG Rating 13.5 500 625 *2 -30 ~ +85 -55 ~ +150 Unit V mA mW C C *1 Vcc shows input voltage of VSYS1,VSYS2,HVcc,BATT,and CHGVcc. *2 Reduced by 5mW for each increase in Ta of 1C over 25C. Recommended Operating Conditions Item Control Circuit Power Supply Voltage Pre-Driver Circuit Power Supply Voltage H-Bridge Power Supply Voltage Power Supply Voltage Charging circuit Power Supply Voltage Operating Temperature Symbol VSYS1 VSYS2 HVCC BATT CHGVCC Ta 1.5 3.0 -10 Min. 2.7 2.7 Typ. 3.2 3.2 PWM 2.4 4.5 25 Max. 5.5 5.5 BATT 8.0 8.0 70 Unit V V V V V C Electrical Characteristics Item (unless otherwise specified, Ta=25C , BATT=2.4V, VSYS1=VSYS2=3.2V,Vref=1.6V, CHGVcc=0V,fCLK=88.2kHz) Symbol IST IBAT ISYS1 ISYS2 ICGVCC GVC134 GVC2 GVC RIN134 RIN2 VOUT VsatL VsatU VOI VOO134 VOO2 VDB VBRON VBROFF VM2ON Measurement Conditions BATT=9.0V, VSYS1=VSYS2=Vref=0V HVCC=0.45V, MUTE34=3.2V HVCC=0.45V, MUTE34=3.2V, EI=0V HVCC=0.45V, MUTE34=3.2V CHGVCC=4.5V, ROUT=OPEN Min. Typ. Max. Unit 0 2.5 4.7 4.1 0.65 12 21.5 -2 14 23.5 0 11 7.5 2.1 240 240 -8 0 0 0 0 -50 -130 -10 2.0 0.8 2.0 400 400 8 50 130 10 3 4.0 6.4 5.5 2.00 16 24.5 2 13 9 A mA mA mA mA dB dB dB k k V mV mV mV mV mV mV V V V IN=1.7V and 1.8V IN=1.7V and 1.8V RL=8, HVcc=BATT=4.0V, IN=0-3.2V Io=-300mA, IN=0 and 3.2V Io=-300mA, IN=0 and 3.2V Vref=IN=1.6V Vref=IN=1.6V IN1=1.8V IN1=1.8V IN2=1.8V 9 6 1.9 MITSUMI 4ch Moter driver IC for Portable CD Player Electrical Characteristics Item (unless otherwise specified, Ta=25C , BATT=2.4V, VSYS1=VSYS2=3.2V,Vref=1.6V, CHGVcc=0V,fCLK=88.2kHz) Symbol VM2OFF VM34ON VM34OFF VrefON VrefOFF IBRAKE1 IPSW VSHIF IHLK GPWM Measurement Conditions IN2=1.8V IN3=IN4=1.8V IN3=IN4=1.8V IN1=IN2=IN3=IN4=1.8V IN1=IN2=IN3=IN4=1.8V Current difference between BRAKE pin "H" time and "L" time. IN1=2.1V IN1=1.8V, HVCC-OUT1F HVCC=9.0V, VSYS1=VSYS2=BATT=0V IN1=1.8V, HVCC=1.2 ~ 1.4V Min. Typ. Max. Unit 0.8 0.8 2.0 1.2 0.8 4 10 0.35 7 13 0.45 0 10 17 0.55 5 V V V V V mA mA V A 1/60 1/50 1/40 1/k VS1TH VEOH VEOL VSPR ISPR1 ISPR2 ISPR3 RSPR VSPTH VHVPR EI=0.7V, CT=0V BSEN Pin Voltage BATT=CT=1.5V, VSYS1=VSYS2=0V, Io=-2mA Starting Time CT=0V, Io=-10mA, EI=0.7V, SPRT=0V CT=2.0V, Io=10mA CT=470pF, VSYS1=VSYS2=0V Starting Time CT=470pF, CLK=0V CT=470pF CT=470pF, EO=0.5V 0.7V Sweep EI=0.7V, Io=-100A EI=1.3V, Io=100A EI=1.3V EI=0.7V EI=1.3V, OFF=0V EI=1.3V, BATT=9.5V 3.05 1.4 3.20 1.6 3.35 0.3 V V V V A A A k V V 0 6 12 12 175 1.10 8.0 10 20 20 220 1.20 8.4 0.1 16 32 32 265 1.30 9.0 VSW1H VSW2H VSW2L fSW1 fSW2 fSW3 TSWmin DSW1 DSW2 DSW3 VOFTH IOFF VSTATH1 VSTATH2 0.78 1.00 65 60 0.01 40 70 65 0.98 1.50 0.30 80 70 88.2 1.13 V V 0.45 95 82 0.60 V kHz kHz kHz s % % % V A V V CT=470pF, VSYS1=VSYS2=0V CT=470pF, EI=0.7V, CLK=0V CT=470pF, EI=0.7V EI=1.3V OFF=0V VSYS1=VSYS2=0V, CT=2.0V VSYS1=VSYS2=0V, CT=2.0V 50 80 75 60 90 85 VSYS1-2.0 75 BATT-0.3 95 115 BATT-1.0 MITSUMI 4ch Moter driver IC for Portable CD Player Electrical Characteristics Item (unless otherwise specified, Ta=25C , BATT=2.4V, VSYS1=VSYS2=3.2V,Vref=1.6V, CHGVcc=0V,fCLK=88.2kHz) Symbol Measurement Conditions Min. Typ. Max. Unit 10 13 2.0 0.8 20 16 30 19 ISTART VCLKTHH VCLKTHL ICLK RDEAD VDEAD VSTNM VSNHS VDIS VEMPT1 VEMPT2 VEMHS1 VEMHS2 VEMP IEMPL RBSEN IBSENL VSELTH ISELT HSRT VRSTHS VRST RRST VAMT1 VAMT2 RAMT IBIAS VOIOP VOHOP VOLOP ISOU ISIN GVO SR VRCHG START=0V A V V A k V V mV V V V mV mV V A k A V A CLK=3.2V 52 0.78 VSYS1=VSYS2=0V 3.2V, START=0V START=0V 2.3 130 1.63 VSEL=0V ISEL =- 2A VSEL=0V ISEL =- 2A Io=1mA, BSEN=1V BSEN=2.4V VSEL=0V VSYS1=VSYS2=0V, BSEN=4.5V VSELTH=BATT-SEL, BSEN=2.0V 1.5 -2 Comparison with error amplifier threshold voltage Io=1mA, VSYS1=VSYS2=2.8V 72 Io=-1mA, VSYS1=VSYS2=2.8V Io=-1mA, START=0V, VSYS1=VSYS2=0V BATT-0.4 BATT-0.4 77 OP+=1.6V -5.5 RL=OPEN RL=OPEN 50 GND 50 VSYS1 VIN=-75dBV, f=1kHz 0.4 -6.5 0.7 70 0.5 CHGVCC=4.5V, RCHG=1.8k 0.71 0.81 2.8 0 95 90 85 25 90 50 17 23 2.1 1.7 25 25 65 0.88 2.5 200 1.83 2.2 1.8 50 50 10 78 0.98 2.7 300 2.03 2.3 1.9 100 100 0.5 1.0 27 1.0 95 100 0.5 108 BATT BATT 113 300 5.5 0.2 -3.0 % mV V k V V k nA mV V V mA mA dB V/s 0.91 V MITSUMI 4ch Moter driver IC for Portable CD Player Electrical Characteristics Item (unless otherwise specified, Ta=25C , BATT=2.4V, VSYS1=VSYS2=3.2V,Vref=1.6V, CHGVcc=0V,fCLK=88.2kHz) Symbol RRCHG ISELLK1 ISELLK2 VSELCG Measurement Conditions CHGVCC=4.5V, RCHG=0.5 and 0.6V CHGVCC=4.5V, RCHG=OPEN, BATT=4.5V CHGVCC=0.6V, RCHG=1.8k, BATT=4.5V CHGVCC=4.5V, Io=300mA, RCHG=0 Min. Typ. Max. Unit 0.75 0.95 1.20 1.0 1.0 0.45 1.00 k A A V Measuring Circuit V a b SW20 1.8k a b SW19 V B a b SW17 A 51k V A POWGND b 47 33 47 A V A A c a b a b SW22 SW23 BRAKE1 OUT1R OUT1F OUT2R OUT2F OUT3F OUT3R OUT4F OUT4R RCHG b a V 35 EMP 36 HVcc 37 PSW a b a A MUTE2 21 IN2 20 MUTE34 19 IN4 18 SW14 SW15 b a b a b A V A V SW24 38 CLK 39 START 40 OFF 41 CHGVCC 42 SEL SW25 SW26 A MM1538XQ IN3 17 SW13 a a Vref 16 VSYS2 15 OP+ 14 V A 1k a b V SW27 43 PREGND 44 PWMFIL OPOUT 13 VSYS1 12 a SW12 10 V RESET a A SW28 b SW11 b DEAD BSEN SPRT BATT OP- A N.C SW EO 2200p 10p Ct 100k EI V 50 1 2 A 3 4 5 SW5 a V 6 b 7 SW6 a 8 9 10 10k 11 SW10 d a b c 20k 100k 470 SW1 a A SW2 a A frequency b V SW3 SW4 ab a V A V b 10k a V SW8 SW7 a b 470p b A V SW9 b aV 1M V 100 A A 34 AMUTE IN1 22 SW16 V A V V A A b SW18 V a V a 33 SW21 32 31 30 29 28 27 26 25 24 23 R F a MITSUMI 4ch Moter driver IC for Portable CD Player Switching Position Table SW No. Item BATT Stand-by Current BATT Supply Current (No load) VSYS1 Supply Current (No load) VSYS2 Supply Current (No load) CHGVcc Supply Current (Noload) VSYS1 Threshold Voltage EO Pin Output Voltage "H" EO Pin Output Voltage "L" SPRT Pin Voltage SPRT Pin Current1 EO="H" SPRT Pin Current2 OFF="L" SPRT Pin Current3 Over-Voltage SPRT Pin Impedance SPRT Pin Threshold Voltage Over-Voltage Protection Detect SW Pin Output Voltage1 "H" SW Pin Output Voltage2 "H" SW Pin Output Voltage2 "L" SW Pin Oscillating Frequency 1 SW Pin Oscillating Frequency 2 SW Pin Oscillating Frequency 3 SW Pin Minimum Pulse Width Pulse Duty Start Max. Pulse Duty At Self-Running Max. Pulse Duty At CLK Synchronization - : Turn off switch 1 a a - 4 a a a b b b b b b b 5 a a a b - 6 a a a a a a a a a a 7 a b b b b a a b - 8 a a a a b b b b b b b 22 a a a - 24 b a b b a 25 a a a a a a - 26 a - MITSUMI 4ch Moter driver IC for Portable CD Player Switching Position Table SW No. Item DEAD Pin Impedance DEAD Pin Output Voltage OFF Pin Threshold Voltage OFF Pin Bias Current START Pin ON Threshold Voltage START Pin OFF Threshold Voltage START Pin Bias Current CLK Pin Threshold Voltage"H" CLK Pin Threshold Voltage"L" CLK Pin Bias Current Starter Switching Voltage Starter Switching Hysteresis Width Discharge Release Voltage VSYS1 Pin RESET Threshold b Voltage Ratio RESET Detection Hysteresis Width RESET Pin Output voltage RESET Pin PULL UP Resistance AMUTE Pin Output Voltage 1 AMUTE Pin Output Voltage 2 AMUTE Pin PULL DOWN Resistance - : Turn off switch 2 - 3 b a - 4 a a a a a a - 6 a - 7 a a - 8 a a b b - 20 b b a 24 b b a - 25 a a a a a a - 26 a a - b b a - MITSUMI 4ch Moter driver IC for Portable CD Player Switching Position Table SW No. Item EMP Detection Voltage 1 EMP Detection Voltage 2 EMP Detection Hysteresis Voltage 1 EMP Detection Hysteresis Voltage 2 EMP Pin Output Voltage EMP Pin Output Leak Current BSEN Pin Input Resistance BSEN Pin Leak Current SEL Pin Detection Voltage SEL Pin Detection Current Input Bias Current Input Offset Voltage "H" Level Output Voltage "L" Level Output Voltage Output Drive Current (Source) Output Drive Current (Sink) Open Loop Voltage Gain Slew Rate - : Turn off switch 1 a a a a a a a a a a - 9 a b a 10 a d c c d 11 b a - 12 a a 21 a a a a b c a a - 27 a b a b a a b - - d b d MITSUMI 4ch Moter driver IC for Portable CD Player Switching Position Table Item ch1R ch2R ch3R ch4R ch1 ch2 ch3 ch4 ch1 ch2 ch3 ch4 ch1R ch2R ch3R ch4R ch1F ch1R ch2F ch2R ch3F ch3R ch4F ch4R ch1F ch1R ch2F ch2R ch3F ch3R ch4F ch4R ch1 ch2 ch3 ch4 ch1 ch2 ch3 ch4 ch1 ch2 ch3 ch4 SW No. 15 16 17 b b b b b b b b b b b b b b b b b b b b b b b b b a b b a b a a b a b b a b a a a a b b b b b b b b b b b b Voltage Gain Gain Error By Polarity Input pin resistance Maximum Output Voltage Saturation Voltage (Lower) Saturation Voltage (Upper) Input Offset Voltage Output Offset Voltage Dead Zone 13 b b b b b b b b a b b - 14 b b b b b b b b a b b 18 b b b b b b b b b b b b b b b b a a a a a a a a b b b b b b b b 22 a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a - : Turn off switch MITSUMI 4ch Moter driver IC for Portable CD Player Switching Position Table Item BRAKE1 ON Voltage BRAKE1 OFF Voltage MUTE2 ON Voltage MUTE2 OFF Voltage MUTE34 ON Voltage MUTE34 OFF Voltage ch1 ch1 ch2 ch2 ch3 ch4 ch3 ch4 ch1 ch2 ch3 ch4 ch1 ch2 ch3 ch4 ch1 SW No. 16 17 18 b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b 13 b b b b - 14 b b b b - 15 b b b b - 22 a a a a a a a a a a a a a a a a a a b a a 23 b a - 28 a b - Vref ON Voltage Vref OFF Voltage BREAK1 Brake Current PWM Sink Current HVCC Level Shift Voltage HVCC Leak Current PWM Amp Transfer Gain SW No. Item CHGSET Pin Bias Voltage CHGSET Pin Output Resistance SEL Pin Leak Current 1 SEL Pin Leak Current 2 SEL Pin Saturation Voltage - : Turn off switch 19 a b a b 27 a a b MITSUMI 4ch Moter driver IC for Portable CD Player Switching Position Table VIN1 Input voltage:VIN(mV) VIN2 VO4 VO3 XC' XC VO2 Dead Zone VIN3 VIN4 VO1 Output Offset Voltage Output voltage:VO(mV) Voltage Gain GVC (+)=20 log VO1-VO2 VIN1-VIN2 GVC (-)=20 log VO3-VO4 VIN3-VIN4 Gain Error By Polarity GVC=GVC (+)-GVC (-) Dead Zone XC-XC'= VIN2*VO1-VIN1*VO2 VO1-VO2 - VIN3*VO4-VIN4*VO3 VO3-VO4 MITSUMI 4ch Moter driver IC for Portable CD Player Application Circuit M TRAVERSE 1.8k M SPINDLE FOCUS TRACKING POWGND 33 32 31 30 29 28 27 26 25 24 BRAKE1 OUT2R OUT3R OUT4R OUT1F OUT2F OUT3F OUT4F OUTIR RCHG 23 IN1 AMUTE BRAKE1 34 MUTE2 BTL BTL TSD / 22 MUTE2 EMP 35 HVcc 33 47 0.1 21 IN2 36 PSW BTL BTL MUTE34 CONTROL CIRCUIT POWER SUPPLY 20 MUTE34 37 47 19 IN4 CLK MAXIMUM DETECTION / 38 START 0.1 CLK / 18 IN3 39 OFF POWER OFF STARTER 17 Vref 100k 40 CHGVcc / 16 VSYS2 41 SEL TSD OVER-VOLTAGE TRIANGLE WAVE PRE-DRIVER POWER SUPPLY 15 OP+ 42 PREGND 14 OPOUT 43 PWMFIL 13 VSYS1 44 100k 2200p 10p 12 RESET BSEN DEAD N.C. BATT SPRT 1 2 3 4 5 6 7 8 9 10 OP- SW EO EI CT 11 FILTER 0.1 8.2k 0.022 0.1 470p VIN 47 DC-DC Converter application VOUT 100 * We shall not be liable for any trouble or damege caused by using this circuit. * In the event a problem which may affect industrial property or any other rights of us or a third party is encountered during the use of information described in these circuit, Mitsumi Electric Co., Ltd. shall not be liable for any such problem, nor grant a license therefor. MITSUMI 4ch Moter driver IC for Portable CD Player Circuit operation 1 H-bridge driver block (1) Gain setting * The driver input resistance (ch 1,3 and 4) are 11k typ. ,ch2 is 7.5k typ. . Set the gain according to the following formula. ch1 ch2 ch3 ch2 R:Externally-connected input GV=20log 55k 11k+R 110k 7.5k+R (db) GV=20log (db) * The driver output stage power supply is HVcc(36PIN), and the bridge circuit power supply is VSYS2 (15PIN). Connect a bypass capacitor between these two power supplies(approximately 0.1F). (2) Mute function * Of the four drivers,ch1 has a brake function,and the other channels have a mute function. * When BRAKE1(23PIN)is set to high level, both ch1 outputs go low level, and the circuit enters brake mode. * When MUTE2(21PIN)is set to high level, the ch2 output is muted. * When MUTE34(19PIN)is set to high level, the ch3 and 4 outputs are muted. (3) Vref drop mute * When the voltage applied to Vref(16PIN)is 1.0V or less typ. , the driver outputs are set to high impedance. (4) Thermal shutdown * When the chip temperature reaches 150C typ. the output current is cut. The chip starts operating again at about 120C typ. . 2 PWM power supply drive block * This detects the maximun output level from among the four channels, and supplies the load drive power supply(36PIN)for the PWM. The external components are a PNP transistor, coil, Schottky diode,and capacitor. 33H BATT 10pF 47k 2200pF 100k 44 PWMFIL 37 PSW SBD 47F 0.1F 36 HVCC MITSUMI 4ch Moter driver IC for Portable CD Player 3 DC-DC converter block (1) Output voltage * 3.2V typ. voltage multiplier circuit can be constructed using external components. This voltage can be varied with the addition of an external resistor. The setting method is as follows. R1 * R3 R2 * R4 + R1+R3 R2+R4 (V) R2 * R4 R2+R4 R1=external resistor VSYS1=1.2 VSYS1 12 R1 7 EI R2 R4 1.2V R3 R2=external resistor R3=35k R4=21k (2) Short protect function * When the error amplifier output(6PIN)has switched to the high-level state,SPRT(8PIN)is charged, and when the voltage reaches 1.2V typ. , the SW(5PIN)switching stops.The time until switching stops is set by the capacitor connected to SPRT(8PIN)according to the following formula. t=CSPRT VTH (sec) (VTH=1.2V, ISPRT=10A) ISPRT (3) Soft start function * The soft start function operates when a capacitor is connected between DEAD(4PIN)and GND. Also, the maximum duty can be varied by connecting a resistor to 4PIN. t=CDEAD R (sec) (R=65k) (4) Power off function * When low-level is applied to OFF(40PIN), SPRT(8PIN)is charged, and when the voltage reaches 1.2V typ. , the SW(5PIN)switching stops. The time until switching stops is set by the capacitor connected to SPRT(8PIN)according to the following formula. t=CSPRT VTH (sec) (VTH=1.2V, IOFF=20A) IOFF MITSUMI 4ch Moter driver IC for Portable CD Player (5) Over voltage protection circuit * When the voltage applied to BSEN(1PIN)reaches 8.4V typ. , SPRT(8PIN)is charged, and when the voltage reaches 1.2V typ. , theSW(5PIN)switching stops. The time until switching stops is set by the capacitor connected to SPRT(8PIN)according to the following formula. t=CSPRT VTH (sec) (VTH=1.2V, IHV=20A) IHV 4 Empty detector block (1) Output voltage * When the voltage applied to the BSEN(1PIN)falls below the detector voltage, EMP(35PIN)goes from high level to low level(open-collector output). The detector voltage has 50mV typ. of hysteresis to prevent output chattering. Use SEL(42PIN)to switch the detection voltage as shown below. SEL L High-Z Detect Voltage 2.20V typ. 1.80V typ. Return Voltage 2.25V typ. 1.85V typ. 5 Reset circuit block * At about 90% typ. of the DC-DC converter output voltage, RESET(3PIN)goes from low level to high level, and AMUTE(34PIN)goes from high level to low level. The reset voltage has 50mV typ. of hysteresis to prevent output chattering. 6 Charging circuit block * The power supply for the charging circuit block is CHGVCC(41PIN), and is independent from the other circuits.The resistance between RCHG(33PIN)and GND sets the charging current. This current is drawn from SEL(42PIN). * A thermal shutdown circuit is provided,and when the chip temperature reaches 150C typ. the charging current is cut. The chip starts operating again at about 120C typ. . MITSUMI 4ch Moter driver IC for Portable CD Player Characteristics Input Load Fluctuation RL= 3 2 Output voltage:VO(V) 1 0 -1 -2 8 4 * * 4 8 20 Ta=normal temperature BATT=HVCC=4V *VSYS1=VSYS2=3.2V *Vref=1.6V 20 -3 -0.8 -0.6 -0.4 -0.2 0 Input voltage:VIN(V) 0.2 0.4 0.6 0.8 Input Load Fluctuation (ch2) RL= 3 2 Output voltage:VO(V) 1 4 8 * * 20 0 -1 -2 20 8 4 Ta=normal temperature BATT=HVCC=4V *VSYS1=VSYS2=3.2V *Vref=1.6V -3 -0.8 -0.6 -0.4 -0.2 0 Input voltage:VIN(V) 0.2 0.4 0.6 0.8 Daed Zone 0.006 0.004 Input voltage:VIN(mV) 0.002 0 -0.002 Ta=normal temperature BATT=HVCC=4V *VSYS1=VSYS2=3.2V *Vref=1.6V * * 20 8 4 8 20 -0.004 4 -0.006 -30 -20 -10 0 Out voltage:VO(mV) 10 20 30 MITSUMI 4ch Moter driver IC for Portable CD Player Characteristics Error Amp Output Voltage Dead Output voltageE:VDAED(V) Eo Output voltage:VEO(V) 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 Ta=normal temperature BATT=2.4V EO PIN DAED PIN 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Control Circuit Power Supply voltage:VSYS1(V) Resete Pin Voltage 4.5 Reset Output voltage:VRST(V) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Control Circuit Power Supply voltage:VSYS1(V) Ta=normal temperature BATT=2.4V |
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