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ML1538
_______________________________________________________________ ML1538 4-ch Motor Driver for Portable CD players Application
Portable CD player
Features
Built-in 4ch H bridge driver, and PWM control of load drive voltage is made possible by external components. DC-DC converter control circuit on chip. With inverted reset output pin. Empty detection level can be switched between rechargeable battery and dry battery. Constant current charging; amount of current can be varied by external resistor. Built-in power transistor for charging. Built-in independent thermal shutdown circuit Package : QFP-44
General Description
ML1538 driver IC contains a 4ch H bridge driver and DC-DC converter control circuit, and was developed for portable CD players. The package in use is QFP-44, making it ideal for smaller set.
4ch Motor Driver for Portable CD Player 1/17
March, 2004 V1.0
ML1538
_______________________________________________________________ Block Diagram
RCHG OUT1R OUT1F OUT2R OUT2F POWGND OUT3F OUT3R OUT4F OUT4R BRAKE1
33
32
31
30
29
28
27
26
25
24
23 BRAKE1
AMUTE
34 35 36 37 38 39 40 41 42 43 44 + + ++ ++4
DEAD
Control Circuit Pow er Supply
22 IN1 MUTE2 BTL BTL TSD MAXIMUM DETECTION +POWER OFF STARTER BTL BTL
V / I V / I V / I V / I
EMP
21 MUTE2 20 IN2
HV CC
PSW
+ + + +
MUTE34
19 MUTE34 18 IN4 17 IN3 16 Vref 15 VSYS2 14 OP+ 13 OPOUT 12 VSYS1
CLK
START
OFF
Pre-Driver Pow er Supply
CHGVCC
TSD
OVER-VOLTAGE
TRIANGLE-WAVE
SEL
PREGND
+-
1
BSEN
2
BATT
3
RESET
Power Unit Power Supply
PWMFIL
5
SW
6
EO
7
EI
8
SPRT
9
CT
10
N.C.
11
OP-
4ch Motor Driver for Portable CD Player 2/17
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ML1538
_______________________________________________________________ Pin Configuration
RCHG OUT1R OUT1F OUT2R OUT2F POWGND OUT3F OUT3R OUT4F OUT4R BRAKE1
33
32
31
30
29
28
27
26
25
24
23
AMUTE
34 35 36 37 38 39 40 41 42 43 44
22 IN1 21 MUTE2 20 IN2 19 MUTE34 18 IN4
EMP
HV CC
PSW
CLK
START
ML1538
17 IN3 16 Vref 15 VSYS2 14 OP+ 13 OPOUT 12 VSYS1
OFF
CHGVCC
SEL
PREGND
PWMFIL
1
BSEN
2
BATT
3
RESET
4
DEAD
5
SW
6
EO
7
EI
8
SPRT
9
CT
10
N.C.
11
OP-
Pin 1 2 3 4 5 6 7 8 9 10 11
Pin Name BSEN BATT RESET DEAD SW EO EI SPRT CT N.C. OP-
Pin 12 13 14 15 16 17 18 19 20 21 22
Pin Name VSYS1 OPOUT OP+ VSYS2 Vref IN3 IN4 MUTE34 IN2 MUTE2 IN1
Pin 23 24 25 26 27 28 29 30 31 32 33
Pin Name BRAKE1 OUT4R OUT4F OUT3R OUT3F POWGND OUT2F OUT2R OUT1F OUT1R RCHG
Pin 34 35 36 37 38 39 40 41 42 43 44
Pin Name AMUTE EMP HVCC PSW CLK START OFF CHGVCC SEL PREGND PWMFIL
4ch Motor Driver for Portable CD Player 3/17
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ML1538
_______________________________________________________________ Pin Description
Pin No. 1 Pin Name BSEN I/O Input Function Battery Voltage Monitor Internal Equivalent Circuit
2 3
BATT RESET
Input
Battery Power Supply Input
Power Supply
Output Reset Detect Output
4
DEAD
Input
DEAD Time Setting
5
SW
Output Transistor Drive For Voltage Multiplier
6
EO
Output Error Amplifier Output
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_______________________________________________________________
Pin No. 7 Pin Name EI I/O Input Function Error Amplifier Input Internal Equivalent Circuit
8
SPRT
Output Short Circuit Protection Setting
9
CT
Output Triangular-Wave Output
10 11 14
N.C. OPOP+ Input Op Amp Negative Input Op Amp Positive Input
12 13
VSYS1 OPOUT
Input
Control Circuit Power Supply Input
Control Circuit Power Supply
Output Op Amp Output
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ML1538
_______________________________________________________________
Pin No. Pin Name 15 16 VSYS2 Vref I/O Input Input Function Reference Voltage Input Internal Equivalent Circuit Driver Pre-step Power Supply Pre-Drive Power Supply
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
19 21 23
MUT34 MUT2 BRAKE1
Input
CH3 and 4 Mute CH2 Mute CH1 Brake
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 Input H-Bridge Power Supply Input
4ch Motor Driver for Portable CD Player 6/17
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ML1538
_______________________________________________________________
Pin No. 33 Pin Name RCHG I/O Input Function Charge Current Setting Internal Equivalent Circuit
34
AMUTE
Output Reset Invert Output
35
EMP
Output Empty Detect Output
37
PSW
Output PWM Transistor Drive
38
CLK
Input
External Clock Synchronizing Input
4ch Motor Driver for Portable CD Player 7/17
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ML1538
_______________________________________________________________
Pin No. 39 Pin Name START I/O Input Function Voltage Multiplier DC-DC Converter Start Internal Equivalent Circuit
40
OFF
Input
Voltage Multiplier DC-DC Converter OFF
41 42
CHGVCC SEL
Input
Charging Circuit Power Supply Input
Charging Circuit Power Supply
Input Empty Detect Level Switch Output
43 44
PREGND PWMFIL Input
Pre Section Power Supply PWM Phase Compensation
Pre Section Power Supply Ground
* The positive and negative outputs are the polarity with respect to the input 4ch Motor Driver for Portable CD Player 8/17 March, 2004 V1.0
ML1538
_______________________________________________________________ Absolute Maximum Ratings
Item Symbol Rating VCC *1 13.5 Supply Voltage IO 500 Driver Output Current Pd 625 *2 Power Dissipation TOPR -30 ~ +85 Operating Temperature TSTG -55 ~ +150 Storage Temperature *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 Unit V mA mW C C
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 Min. 2.7 2.7 1.5 3.0 -10 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
(unless otherwise specified, Ta=25C, BATT=2.4V, VSYS1=VSYS2=3.2V, Vref=1.6V, CHGVcc=0V, fCLK=88.2kHz) Item Symbol Measurement Conditions Min. Typ. Max. < Common Section > BATT Stand-by Current IST BATT=9.0V, 0 3 VSYS1=VSYS2=Vref=0V BATT Supply Current (No load) IBAT HVcc=0.45V, MUTE34=3.2V 2.5 4.0 VSYS1 Supply Current (No load) ISYS1 HVcc=0.45V, MUTE34=3.2V, EI=0V 4.7 6.4 VSYS2 Supply Current (No load) ISYS2 HVcc=0.45V, MUTE34=3.2V 4.1 5.5 CHGVcc Supply Current (No load) ICGVCC CHGVcc=4.5V, ROUT=OPEN 0.65 2.00 < H-Bridge Driver Part > Voltage Gain ch1, ch3.ch4 GVC134 12 14 16 Voltage Gain ch2 GVC2 21.5 23.5 24.5 -2 0 2 Gain Error By Polarity GVC Input pin resistance ch1,ch3,ch4 RIN134 IN=1.7V and 1.8V 9 11 13 Input pin resistance ch2 RIN2 IN=1.7V and 1.8V 6 7.5 9 Maximum Output Voltage VOUT 1.9 2.1 RL=8, HVcc=BATT=4.0V, IN=0-3.2V Saturation Voltage (Lower) VsatL Io=-300mA, IN=0 and 3.2V 240 400 Saturation Voltage (Upper) VsatU Io=-300mA, IN=0 and 3.2V 240 400 Input Offset Voltage VOI -8 0 8 Outut Offset Voltage ch1,ch3,ch4 VOO134 Vref=IN=1.6V -50 0 50 Output Offset Voltage ch2 VOO2 Vref=IN=1.6V -130 0 130 Dead Zone VDB -10 0 10 BRAKE1ON Threshold Voltage VBRON IN1=1.8V 2.0 BRAKE1OFF Threshold Voltage VBROFF IN1=1.8V 0.8 MUTE2 ON Threshold Voltage VM2ON IN2=1.8V 2.0 Unit A mA mA mA mA dB dB dB k k V mV mV mV mV mV mV V V V
4ch Motor Driver for Portable CD Player 9/17
March, 2004 V1.0
ML1538
_______________________________________________________________ Electrical Characteristics
(unless otherwise specified, Ta=25C, BATT=2.4V, VSYS1=VSYS2=3.2V, Vref=1.6V, CHGVcc=0V, fCLK=88.2kHz) Item Symbol Measurement Conditions Min. Typ. Max. < H-Bridge Driver Part > MUTE2 OFF Threshold Voltage VM2OFF IN2=1.8V 0.8 MUTE34 ON Threshold Voltage VM34ON IN3=IN4=1.8V 0.8 MUTE34 OFF Threshold Voltage VM34OFF IN3=IN4=1.8V 2.0 Vref ON Threshold Voltage VrefON IN1=IN2=IN3=IN4=1.8V 1.2 Vref OFF Threshold Voltage VrefOFF IN1=IN2=IN3=IN4=1.8V 0.8 BRAKE1 Brake Current IBRAKE1 Current difference between BRAKE 4 7 10 pin "H" time and "L" time. < PWM Power Supply Driving > PSW Sink Current IPSW IN1=2.1V 10 13 17 HVcc Level Shift Voltage VSHIF IN1=1.8V, HVcc-OUT1F 0.35 0.45 0.55 HVcc Leak Current IHLK HVcc=9.0V, 0 5 VSYS1=VSYS2=BATT=0V PWM Amp Transfer Gain GPWM IN1=1.8V, HVcc=1.2~1.4V 1/60 1/50 1/40 < DC-DC Converter > < Error Amp > VSYS1 Threshold Voltage VS1TH 3.05 3.20 3.35 EO Pin Output Voltage "H" VEOH 1.4 1.6 EI=0.7V, Io=-100A EO Pin Output Voltage "L" VEOL 0.3 EI=1.3V, Io=100A < Short Circuit Protection > SPRT Pin Voltage VSPR EI=1.3V 0 0.1 EO=H SPRT Pin Current1 ISPR1 EI=0.7V 6 10 16 OFF=L SPRT Pin Current2 ISPR2 EI=1.3V, OFF=0V 12 20 32 SPRT Pin Current3 Over-Voltage ISPR3 EI=1.3V, BATT=9.5V 12 20 32 SPRT Pin Impedance RSPR 175 220 265 SPRT Pin Threshold Voltage VSPTH EI=0.7V, CT=0V 1.10 1.20 1.30 Over-Voltage Protection Detect VHVPR BSEN Pin Voltage 8.0 8.4 9.0 < Transistor Driving > BATT= CT =1.5V, VSYS1=VSYS2=0V, 0.78 0.98 1.13 SW Pin Output Voltage1 "H" VSW1H IO=-2mA Starting Time SW Pin Output Voltage 2 "H" VSW2H CT =0V, IO=-10mA, EI=0.7V, 1.00 1.50 SPRT=0V SW Pin Output Voltage 2 "L" VSW2L CT =2.0V, IO=10mA 0.30 0.45 SW Pin Oscillating Frequency1 fSW1 CT =470pF, VSYS1=VSYS2=0V 65 80 95 Starting Time SW Pin Oscillating Frequency2 fSW2 CT =470pF, CLK=0mA 60 70 82 SW Pin Oscillating Frequency3 fSW3 CT =470pF 88.2 SW Pin Minimum Pulse Width TSWmin CT =470pF, EO=0.5V 0.7V Sweep 0.01 0.60 Pulse Duty Start DSW1 CT =470pF, VSYS1=VSYS2=0V 40 50 60 Max.Pulse Duty At Self-Running DSW2 CT =470pF, EI=0.7V, CLK=0V 70 80 90 Max.Pulse Duty At CLK DSW3 CT =470pF, EI=0.7V 65 75 85 Synchronization Unit V V V V V mA mA V A 1/k V V V V A A A k V V V V V kHz kHz kHz s % % %
4ch Motor Driver for Portable CD Player 10/17
March, 2004 V1.0
ML1538
_______________________________________________________________ Electrical Characteristics
(unless otherwise specified, Ta=25C, BATT=2.4V, VSYS1=VSYS2=3.2V, Vref=1.6V, CHGVcc=0V, fCLK=88.2kHz) Item Symbol Measurement Conditions Min. Typ. Max. Unit < Interface > VSYS1 V OFF Pin Threshold Voltage VOFTH EI=1.3V
- 2.0
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 < Dead Time > DEAD Pin Impedance DEAD Pin Output Voltage < Starter Circuit > Starter Switching Voltage Starter Switching Hysteresis Width Discharge Release < Empty Detection > EMP Detection Voltage 1 EMP Detection Voltage 2 EMP Detection Hysteresis Voltage1 EMP Detection Hysteresis Voltage2 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 < Reset Circuit > VSYS1 RESET Threshold 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
IOFF VSATH1 VSATH2 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
OFF=0V VSYS1=VSYS2=0V, CT =2.0V VSYS1=VSYS2=0V, CT =2.0V START=0V
75
95
115 BATT -1.0 30 19 0.8 10
A V V
BATT -0.3 10 13 2.0
20 16
A V V A k V V mV V V V mV mV V A k A V A % mV V k V V k
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 Comparison with error amplifier threshold voltage Io=1mA, VSYS1=VSYS2=2.8V Io=-1mA, VSYS1=VSYS2=2.8V Io =-1mA, START=0V, VSYS1=VSYS2=0V 72 BATT -04 BATT -04 77 90 2.1 1.7 25 25 65 0.88 2.5 200 1.83 2.2 1.8 50 50
78 0.98 2.7 300 2.03 2.3 1.9 100 100 0.5 1.0 27 1.0
17 1.5 -2 85 25
23
90 50
95 100 0.5 108 BATT BATT
95
113
4ch Motor Driver for Portable CD Player 11/17
March, 2004 V1.0
ML1538
_______________________________________________________________ Electrical Characteristics
(unless otherwise specified, Ta=25C, BATT=2.4V, VSYS1=VSYS2=3.2V, Vref=1.6V, CHGVcc=0V, fCLK=88.2kHz) Item Symbol Measurement Conditions Min. Typ. Max. < Op Amp > Input Bias Current IBIAS OP+=1.6V 300 Input Offset Voltage VOIOP -5.5 0 5.5 High Level Output Voltage VOHOP RL=OPEN 2.8 Low Level Output Voltage VOLOP RL=OPEN 0.2 Output Drive Current (Source) ISOU -6.5 -3.0 50 GND Output Drive Current (Sink) ISIN 0.4 0.7 50 VSYS1 Open Loop Voltage Gain GVO VIN=-75dBV, f=1kHz 70 Slew Rate SR 0.5 < Battery Charging Circuit > RCHG Pin Bias Voltage VRCHG 0.71 0.81 0.91 CHGVcc=4.5V, RCHG=1.8 k RCHG Pin Output Resistance RRCHG CHGVcc=4.5V, RCHG=0.5 and 0.6V 0.75 0.95 1.2 SEL Pin Leak Current 1 ISELLK1 CHGVcc=4.5V, RCHG=OPEN, 1.0 BATT=4.5V SEL Pin Leak Current 2 ISELLK2 1.0 CHGVcc=0.6V, RCHG=1.8 k, BATT=4.5V SEL Pin Saturation Voltage VSELCG 0.45 1.00 CHGVcc=4.5V, Io=300mA, RCHG=0k Unit nA mV V V mA mA dB V/s V k A A V
4ch Motor Driver for Portable CD Player 12/17
March, 2004 V1.0
ML1538
_______________________________________________________________ Application Circuit
M
Transverse
M
Spindle Focus Tracking
1.8k POWGND OUT3R OUT3F OUT4R OUT4F BRAKE1 OUT1R OUT2R OUT1F OUT2F RCHG
33
32
31
30
29
28
27
26
27
26
23
BRAKE1
AMUTE IN1
34 35
33u 47u + HVCC 0.1u
22 MUTE2 BTL BTL TSD MAXIMUM DETECTION +POWER OFF STARTER BTL BTL MUTE34 + ++ ++CT SPRT N.C. SW EO OPControl Circuit Pow er Supply V / I V / I V / I V / I
EMP
MUTE2
21
IN2
36 37
20 + + + +
Pre-Driver Pow er Supply
PSW 47
MUTE34
19
IN4
CLK
38
START
18
IN3
39
0.1u OFF 100k
17
Vref
40
CHGVCC
16
VSYS2
41
SEL
TSD
OVER-VOLTAGE
TRIANGLE-WAVE
15
OP+
42
PREGND
14 + Power Unit Power Supply
OPOUT
43
PWMFIL
13
VSYS1
+-
44
100k 2200p 470p
12
RESET
DEAD
BSEN
BATT
1
2
3
4
5
6
7
8
9
10
11
Filter
0.1u VIN + 47u DC-DC Converter Circuit
8.2k
EI
0.022u VOUT + 100u
0.1u
470p
Note : We shall not be liable for any trouble or damage caused by using this circuit.
4ch Motor Driver for Portable CD Player 13/17
March, 2004 V1.0
ML1538
_______________________________________________________________ Circuit Operation
1. H-bridge driver block
(1) Gain setting The driver input resistance (ch 1,3 and 4) are 11k typ., ch2 is 7.5 k typ. . Set the gain according to the following formula. ch1 ch2 ch3 ch2 GV=20log 110k 7.5k+R (db) GV=20log 55k 11k+R (db)
R: Externally-connected input
The driver output stage power supply is HVCC(PIN 36), and the bridge circuit power supply is VSYS2(PIN 15). 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(PIN 23) is set to high level, both ch1 outputs go low level, and the circuit enters brake mode. When MUTE2(PIN 21) is set to high level, the ch2 output is muted. When MUTE34(PIN 19) is set to high level, the ch3 and 4 outputs are muted. (3) Vref drop mute When the voltage applied to Vref(PIN16) 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. .
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ML1538
_______________________________________________________________
2. PWM power supply drive block
This detects the maximum output level from among the four channels, and supplies the load drive power supply (PIN 36) for the PWM. The external components are a PNP transistor, coil, Schottky diode, and capacitor.
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 + R1+R3 R2* R4 R2+R4
VSYS1=1.2 x
(V)
R2* R4 R2+R4
R1 = external resistor R2 = external resistor R3 = 35 k R4 = 21 k
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March, 2004 V1.0
ML1538
_______________________________________________________________
(2) Short protect function When the error amplifier output(PIN 6) has switched to the high-level state, SPRT(PIN 8) is charged, and when the voltage reaches 1.2V typ. , the SW(PIN 5) switching stops. The time until switching stops is set by the capacitor connected to SPRT(PIN 8) according to the following formula.
t=CSPRT x VTH (sec) (VTH=1.2V, ISPRT=10A) ISPRT
(3) Soft start function The soft start function operates when a capacitor is connected between DEAD(PIN 4) and GND. Also, the maximum duty can be varied by connecting a resistor to PIN 4.
t=CDEAD x R(sec) (R=65 k)
(4) Power off function When low-level is applied to OFF(PIN 40), SPRT(PIN 8) is charged, and when the voltage reaches 1.2V typ., the SW(PIN 5) switching stops. The time until switching stops is set by the capacitor connected to SPRT(PIN 8) according to the following formula.
t=CSPRT VTH OFF (sec) (VTH=1.2V, IOFF=20A)
(5) Over voltage protection circuit When the voltage applied to BSEN(PIN 1) reaches 8.4V typ., SPRT(PIN 8) is charged, and when the voltage reaches 1.2V typ., the SW(PIN 5) switching stops. The time until switching stops is set by the capacitor connected to SPRT(PIN 8) according to the following formula.
VTH OFF
t=CSPRT x
(sec) (VTH=1.2V, IOFF=20A)
4ch Motor Driver for Portable CD Player 16/17
March, 2004 V1.0
ML1538
_______________________________________________________________
4. Empty detector block
(1) Output voltage When the voltage applied to the BSEN(PIN 1) falls below the detector voltage, EMP(PIN 35) goes from high level to low level (open-collector output). The detector voltage has 50mV typ. of hysteresis to prevent output chattering. Use SEL(PIN 42) 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(PIN 3) goes from low level to high level, and AMUTE(PIN 34) 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(PIN 41), and is independent from the other circuits. The resistance between RCHG(PIN 33) and GND sets the charging current. This current is drawn from SEL(PIN 42). 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. .
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.
4ch Motor Driver for Portable CD Player 17/17
March, 2004 V1.0

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