TA2092N
TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA2092N
Power Driver IC for CD Player
The TA2092N 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
= 15dB (typ.)
High output power
: V
OM1
= 5 V
p-p
(typ.) @V
CC
= 5 V, R
L
= 5
Ω
: V
OM2
= 6 V
p-p
(typ.) @V
CC
= 6 V, R
L
= 5
Ω
·
·
·
Thermal shutdown circuit
Input reference voltage short protection
Operating voltage range: V
CC (opr)
= 4.0~10.0 V (Ta = 25°C)
Weight: 1.2 g (typ.)
Block Diagram
1
2001-12-19
TA2092N
Terminal Explanation
Terminal
No.
1
Symbol
Function
Equivalent Circuit
Power GND
PW GND
●
Connected to substrate.
●
pin 1, 12, 13, 24 are connected inside.
OUT (−) 1 Inverted output for CH1
Supply terminal of output stage for CH1
●
Supply terminal of output stage are not connected to other
channel terminal.
2
3
PV
CC1
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
≤
1.8 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
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
V
IN2
Input for CH2
OUT (+) 2 Non-inverted output for CH2
PV
CC2
Supply terminal of output stage for CH2
Same as channel 1
OUT (−) 2 Inverted output for CH2
PW GND Power GND
PW GND Power GND
OUT (−) 3 Inverted output for CH3
PV
CC3
Supply terminal of output stage for CH3
Same as channel 1
OUT (+) 3 Non-inverted output for CH3
V
IN3
S GND
S V
CC
V
IN4
Input for CH3
Supply terminal of small signal GND
Small signal GND
Input for CH4
―
―
OUT (+) 4 Non-inverted output for CH4
PV
CC4
Supply terminal of output stage for CH4
Same as channel 1
OUT (−) 4 Inverted output for CH4
PW GND Power GND
2
2001-12-19
TA2092N
Maximum Ratings
(Ta = 25°C)
Characteristics
Supply voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
V
CC
P
D
(Note 1)
T
opr
T
stg
Rating
14
(2) (Note 2)
−30~85
−55~150
Unit
V
W
°C
°C
Note 1: Mounted on 50 mm × 50 mm × 1.6 mm size board with copper area 60 % over.
Note 2: Derated above Ta = 25°C, in the proportion of 62.5 mW/°C.
Electrical Characteristics
Characteristics
Operating voltage
Quiescent current
Input offset current
V
RI
terminal offset current
(unless otherwise specified, V
CC
= 5 V, R
L
= 5
Ω,
R
g
= 620
Ω,
V
RI
= 2.1 V, f =
1
kHz, Ta = 25°C)
Symbol
V
CC
I
CCQ
I
IN
I
10
V
O OS1
Output offset voltage
V
O OS2
V
O OS3
Reference output voltage
Maximum output voltage
Voltage gain
Frequency response
Total harmonic distortion
Slew rate
Cross talk
Ripple rejection ratio
Thermal shut down temperature
V
RI
~GND short protection voltage
V
OUT
V
OM1
V
OM2
G
V
f
c
THD
S.R.
C.T.
R.R.
T
TSD
V
RI OFF
Test
Circuit
―
―
―
―
―
―
―
―
―
―
―
―
―
―
―
―
―
―
V
CC
= 5 V
V
CC
= 6 V
V
in
= 100 mVrms
V
in
= 100 mVrms
V
in
= 100 mVrms
V
out
= 2 V
p-p
V
out
= 1 Vrms
f
rip
= 100 Hz, V
rip
= 100 mVrms
Chip temperature
―
Test Condition
―
V
in
= 0, R
L
= OPEN
V
IN
= 2.1 V
V
RI
= 2.1 V
V
CC
= 5 V, R
g
= 0
Ω
V
CC
= 8 V, R
g
= 0
Ω
V
CC
= 12 V, R
g
= 0
Ω
―
Min
4.0
20
―
―
−30
−50
−100
―
4.0
5.0
14.5
―
―
―
―
―
―
1.4
Typ.
―
35
250
35
―
―
―
2.1
5.0
6.0
15.5
100
−50
1.0
−60
−60
150
1.6
Max
10.0
60
800
120
30
50
100
―
―
―
16.5
―
―
―
―
―
―
1.8
V
V
p-p
dB
kHz
dB
V/µs
dB
dB
°C
V
mV
Unit
V
mA
nA
µA
3
2001-12-19
TA2092N
Test Circuit
4
2001-12-19
TA2092N
Precaution Use
·
·
Input stage
·
Input stages are consisted of differential circuit of NPN Tr, and have built-in IB 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 1.8 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
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 µF, 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 10 to 100 µF between V
RI
terminal and GND.
V
CI
terminal is recommend to use “OPEN”.
to
pre-output
5
2001-12-19
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