UNISONIC TECHNOLOGIES CO.,
UA1538
4-CH MOTOR DRIVER FOR
PORTABLE CD PLAYERS
DESCRIPTION
The UTC UA1538 contains a 4ch H bridge driver and
DC-DC converter control circuit on one chip, and was
developed for use in portable CD players.
LINEAR INTEGRATED CIRCUIT
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 reset output inversion output pin.
* Empty detection level can be switched between rechargeable
battery and dry battery.
* Constant current charging; current value can be varied using
external resistor.
* Built-in power transistor for charging.
* Built-in independent thermal shutdown circuit.
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UA1538L-QM1-Y
UA1538G-QM1-Y
Package
QFP-44
Packing
Tray
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co.,
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QW-R109-023,C
UA1538
PIN CONFIGURATION
RCHG OUT1R OUT1F OUT2R OUT2F
33
32
31
30
29
POW
GND
28
27
26
LINEAR INTEGRATED CIRCUIT
OUT3F OUT3R OUT4F OUT4R BRAKE1
25
24
23
AMUTE 34
22
IN1
EMP 35
21 MUTE2
HV
CC
36
20 IN2
PSW 37
19
MUTE34
CLK 38
18
IN4
START 39
OFF 40
UTC UA1538
17
IN3
16 V
REF
15 V
SYS2
14 OP+
13
CHGV
CC
41
SEL 42
PREGND 43
OPOUT
PWMFIL 44
12 V
SYS1
1
BSEN
2
BATT
3
4
5
SW
6
EO
7
EI
8
SPRT
9
CT
10
N.C.
11
OP-
RESET DEAD
PIN DESCRIPTION
PIN NO. PIN NAME INPUT/OUTPUT
FUNCTION
INTERMAL EQUIVALENT CIRCUIT
1
BSEN
Input
Battery Voltage Monitor
2
BATT
Input
Battery Power Supply Input
Power Supply
3
RESET
Output
Reset Detect Output
4
DEAD
Input
DEAD Time Setting
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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UA1538
PIN DESCRIPTION(Cont.)
PIN NO. PIN NAME INPUT/OUTPUT
FUNCTION
Transistor Drive For Voltage
Multiplier
LINEAR INTEGRATED CIRCUIT
INTERMAL EQUIVALENT CIRCUIT
BATT
5
SW
Output
5
150Ω
6kΩ
6
EO
Output
Error Amplifier Output
V
SYS1
35kΩ
7
EI
Input
Error Amplifier Input
7
21.6kΩ
8
SPRT
Output
Short Circuit Protection Setting
V
SYS1
BATT
2kΩ
9
9
CT
Output
Triangular-Wave Output
420kΩ
10kΩ
10
N.C.
11
14
OP-
OP+
Input
Op Amp Negative Input
Op Amp Positive Input
12
V
SYS1
Input
Control Circuit Power Supply
Input
Control Circuit Power Supply
13
OPOUT
Output
Op Amp Output
15
V
SYS2
Input
Driver Pre-step Power Supply
Pre-Drive Power Supply
16
V
REF
Input
Reference Voltage Input
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R109-023,C
UA1538
PIN DESCRIPTION(Cont.)
PIN NO. PIN NAME INPUT/OUTPUT
17
18
20
22
19
21
23
24
25
26
27
29
30
31
32
28
36
IN3
IN4
IN2
IN1
MUTE34
MUTE2
BRAKE1
OUT4R
OUT4F
OUT3R
OUT3F
OUT2F
OUT2R
OUT1F
OUT1R
POWGND
HV
CC
Input
FUNCTION
Ch3 Control Signal Input
Ch4 Control Signal Input
Ch2 Control Signal Input
Ch1 Control Signal Input
Ch3 and 4 Mute
Ch2 Mute
Ch1 Brake
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
H-Bridge Power Supply Input
LINEAR INTEGRATED CIRCUIT
INTERMAL EQUIVALENT CIRCUIT
Input
19
21
23
68kΩ
68kΩ
Input
Output
33
RCHG
Input
Charge Current Setting
34
AMUTE
Output
Reset Invert Output
35
EMP
Output
Empty Detect Output
BATT
37
37
PSW
Output
PWM Transistor Drive
50Ω
38
CLK
Input
External Clock Synchronizing
Input
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R109-023,C
UA1538
PIN DESCRIPTION(Cont.)
PIN NO. PIN NAME INPUT/OUTPUT
FUNCTION
LINEAR INTEGRATED CIRCUIT
INTERMAL EQUIVALENT CIRCUIT
39
START
Input
Voltage Multiplier DC-DC
Converter Start
40
OFF
Input
Voltage Multiplier DC-DC
Converter OFF
41
CHGV
CC
Input
Charging Circuit Power
Supply Input
Charging Circuit Power Supply
BATT
200kΩ
130kΩ
42
SEL
Input/Output
Empty Detect Level Switch
42
15kΩ
43
PREGND
Pre Section Power Supply
Ground
Pre Section Power Supply Ground
V
SYS1
2kΩ
44
PWMFIL
Input
PWM Phase Compensation
44
2kΩ
*The positive and negative outputs are the polarity with respect to the input
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R109-023,C
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