TA2092AN
2001-08-28
1
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA2092AN
Power Driver IC for CD Player
The TA2092AN is a power driver IC developed for CD players.
This IC have built-in 4 channel BTL power amplifiers which
drives focus-coil, tracking-coil for 3-beam pick-up head, disc
motor and feed motor.
Features
4 channel BTL linear drivers
Fixed voltage gain: G
V
= 15.5dB (typ.)
High output power
Thermal shutdown circuit
Input reference voltage short protection
Operating voltage range: V
CC (opr)
= 4.5~10.0 V (Ta = 25C)
Block Diagram
Weight: 1.2 g (typ.)
TA2092AN
2001-08-28
2
Terminal Explanation
Terminal
No.
Symbol Function
Equivalent
Circuit
1 PW
GND
Power GND
Connected to substrate.
pin 1, 12, 13, 24 are connected inside.
2 OUT
(-) 1 Inverted output for CH1
3 PV
CC1
Supply terminal of output stage for CH1
Supply terminal of output stage are not connected to other
channel
terminal.
4
OUT (+) 1 Non-inverted output for CH1
5 V
IN1
Input for CH1
Not biased inside
6 V
RI
Input reference voltage
Under condition of V
RI
1.1 V, internal bias circuit is shut off.
No signal input condition: V
RI
= V
IN
7 V
CI
Output reference voltage
V
OUT
= V
CI
= (V
CC
-V
F
) /2
8 V
IN2
Input
for
CH2
9
OUT (+) 2 Non-inverted output for CH2
10 PV
CC2
Supply terminal of output stage for CH2
11 OUT
(-) 2 Inverted output for CH2
12
PW GND Power GND
Same as channel 1
13
PW GND Power GND
14 OUT
(-) 3 Inverted output for CH3
15 PV
CC3
Supply terminal of output stage for CH3
16
OUT (+) 3 Non-inverted output for CH3
17 V
IN3
Input
for
CH3
Same as channel 1
18
S GND
Supply terminal of small signal GND
19 S
V
CC
Small signal GND
20 V
IN4
Input
for
CH4
21
OUT (+) 4 Non-inverted output for CH4
22 PV
CC4
Supply terminal of output stage for CH4
23 OUT
(-) 4 Inverted output for CH4
24
PW GND Power GND
Same as channel 1
TA2092AN
2001-08-28
3
Maximum Ratings
(Ta = 25C)
Characteristics Symbol
Rating
Unit
Supply voltage
V
CC
14 V
Power dissipation
P
D
(Note 1)
(2) (Note 2)
W
Operating temperature
T
opr
-30~85
C
Storage temperature
T
stg
-55~150 C
Note 1: Mounted on 50 mm 50 mm 1.6 mm size board with copper area 60 % over.
Note 2: Derated above Ta = 25C, in the proportion of 62.5 mW/C.
Electrical Characteristics
(unless otherwise specified, V
CC
= 8 V, R
L
= 5 , f = 1 kHz,
V
BIAS
= 1.65 V, R
g
= 3.3 k, Ta = 25C)
Characteristics Symbol
Test
Circuit
Test Condition
Min
Typ.
Max
Unit
Operating voltage
V
CC
4.5
8.0
10.0
V
Quiescent current
I
CCQ
V
in
= 0, R
L
=
OPEN
30 50 70 mA
Input offset current
I
IN
V
IN
= 1.65 V
0 200
nA
V
RI
terminal offset current
I
10
V
RI
= 1.65 V
30 60 A
Output offset voltage
V
OS
R
g
= 3.3 k
-68
68 mV
Reference output voltage
V
OUT
3.6 V
Maximum output voltage
V
OM
7
8
Vp-p
Voltage gain
G
V
V
IN
=
100
mV
14.5 15.5 16.5
dB
Frequency response
f
c
V
in
= 100 mVrms
100 kHz
Total harmonic distortion
THD
V
in
= 100 mVrms
-50
dB
Slew rate
S.R.
V
out
= 2 Vp-p
1.0 V/s
Cross talk
C.T.
V
out
= 1 Vrms
-60
dB
Ripple rejection ratio
R.R.
f
rip
= 100 Hz, V
rip
= 100 mVrms
-60
dB
Thermal shut down temperature
T
TSD
Chip
temperature
150 C
V
RI
~GND short protection voltage
V
RI OFF
0.9 1.1 1.3 V
TA2092AN
2001-08-28
5
Precaution Use
Input stage
Input stages are consisted of differential circuit of PNP Tr, and have built-in base current compensation
circuit.
Built-in driver
Each channel driver consists of BTL configuration linear amplifier.
Voltage gain is fixed: G
V
= 15.5dB (typ.)
Voltage loss for output stage is 2 V
BE
= V
CE (sat)
for positive cycle, V
CE (sat)
for negative cycle, because of
no-bootstrap circuit. So, output DC voltage is designed as less than 1/2 V
CC
.
V
RI
terminal
V
RI
is reference voltage terminal for input signal.
If reference voltage from servo IC drop less than 1.1 V, protection circuit operates and shut off bias circuit
inside. This operation is to prevent load from moving undesireably in case of V
RI
drop for accident or some
reason.
V
CI
terminal
Output DC voltage is determined by circuit of this terminal inside as;
V
CI
= V
OUT (DC)
= (V
CC
-V
F
) /2
Output signal dynamic range is depend on V
CC
. On the other hand, input signal dynamic range is determined
by V
RI
as mentioned and voltage gain is fixed inside. So, maximum output voltage does not increase as V
CC
increases.
Because of BTL configuration, Ripple Rejection Ratio does not improve not much when capacitor is connected
to V
CI
terminal to GND.
GND
Large signal GND is for output stage and small signal GND is for stages from input circuit to pre-output
stage.
These GND pins are not connected inside.
The heat of power dissipation is transferred to PCB, through these PW-GND Pin, because, 1, 12, 13, 24 pin
are connected each other and to substrate of Pellet to connected copper foil area as large as possible.
Oscillation preventive capacitor
We recommend to use the capacitor of 0.1 F, between each output terminals. But perform the temperature
test to check the oscillation allowance, since the oscillation allowance is varied according to the causes
described below.
1) Supply voltage
2) Ambient temperature
3) Load impedance
4) Capacity value of condenser
5) Kind of condenser
6) Layout of Printed board
We recommend to connect Pass-condenser, which is about 47 to 100 F between V
RI
terminal and GND.
V
CI
terminal is recommend to use "OPEN".
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