ICs for Compact Disc/CD-ROM Player
AN8783SB
4-channel linear driver IC for CD/CD-ROM drive
■ Overview
Unit: mm
18.4±0.2
(5.15)
(4.8)
28
22
21
15
+0.10
0.30–0.05
(1.315)
8.3±0.2
10.93±0.30
The AN8783SB employs one channel of power
op-amp. system and three channels of H-bridge
system. Two channels out of three channels of Hbridge method are a current feedback system. So
this IC is optimum for driving an actuator and a
motor of CD/CD-ROM drive. It comes with a
surface mount package which excels in a heat radiation characteristic.
0° to 10°
1
7
8
14
■ Features
• Little phase delay due to current feedback system
(2-channel for actuator)
• 4 modes of forward, reverse rotations, braking and
standby can be selected from channels for loading motor (H-bridge method) by a digital signal
from a microcomputer.
• Wide output dynamic range regardless of reference voltage of the system
• Setting the input level of a driver by an external
resistor is possible.
• PC (power cut) function built-in (common for ch.
1, ch. 3 and ch. 4)
• Thermal shut-down circuit built-in (with hysteresis)
(6.4)
(1.2)
0.8
0.35+0.10
–0.05
Seating plane
0.1±0.1
2.7±0.2
0.65±0.20
HSOP042-P-0400
■ Applications
• CD/CD-ROM drive
1
AN8783SB
ICs for Compact Disc/CD-ROM Player
S4
D4−
PVC4
6
8
9
D4+
10
S3
PVC3
5
13
D3−
12
D3+
14
PVC2
16
D2+
BTL linear
driver ch. 2
1/2 PVCC
PGND1
15
D2−
17
D1−
18
20
21
D1+
PVC1
■ Block Diagram
BTL linear
driver ch. 4
BTL linear
driver ch. 3
11 PGND2
19
Reset
28
SVCC
ch. 1
Direction
det.
current
amp.
ch. 3
ch. 2
Control
logic
2
Absolute
V-l
direction
det.
Absolute
V-l
direction
det.
Thermal
protect
Fin
7
ch. 4
Comp.
SVCC
monitor
22
1
VREF
PC1
4
IN4
3
IN3
26
PC2
IN2
24
25
AS
23
IN1
N.C.
27
VREF
monitor
■ Pin Descriptions
Pin No.
2
Description
Pin No.
Description
1
PC1 (power cut) input pin
16
Driver-2 power supply pin
2
Driver-3 phase compensation pin
17
Driver-2 reverse rotation output pin
3
Driver-3 input pin
18
Driver-1 reverse rotation output pin
4
Driver-4 input pin
19
Driver-1 GND pin
5
Driver-3 feedback pin
20
Driver-1 forward rotation output pin
6
Driver-4 feedback pin
21
Driver-1 power supply pin
7
Driver-4 phase compensation pin
22
VREF input pin
8
Driver-4 current feedback power supply pin
23
Driver-1 input pin
9
Driver-4 reverse rotation output pin
24
Driver-2 input pin
10
Driver-4 forward rotation output pin
25
Driver-2 output voltage adjustment pin
11
Driver-2, driver-4 GND pin
26
PC2 (power cut) input pin
12
Driver-3 reverse rotation output pin
27
N.C.
13
Driver-3 current feedback power supply pin
28
Power supply pin
14
Driver-3 forward rotation output pin
Fin
GND pin
15
Driver-2 forward rotation output pin
ICs for Compact Disc/CD-ROM Player
AN8783SB
■ Absolute Maximum Ratings
Parameter
Supply voltage
Supply current
Power dissipation
*2
Operating ambient temperature
Storage temperature
*1
*1
Symbol
Rating
Unit
SVCC
14.4
V
ICC
mA
PD
542
mW
Topr
−30 to +85
°C
Tstg
−55 to +150
°C
Note) *1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.
*2: Referring to "■ Application Circuit Example", use within the range of PD = 542 mW or less at Ta = 85°C, following the
allowable power dissipation characteristic curve of "■ Application Notes".
■ Recommended Operating Range
Parameter
Supply voltage
Symbol
Range
Unit
SVCC
6.4 to 14
V
PVC1 , PVC2
4.5 to 14
■ Electrical Characteristics at SVCC = 12 V, VCC1 = 12 V, VCC2 = 5 V, RL = 8 Ω, VPC1 = 0 V, VPC2 = 5 V,
Ta = 25°C
Parameter
Symbol
Current consumption 1 with no
signal
ISVCC
Current consumption 2 with no
signal
Current consumption 3 with no
signal
Conditions
Min
Typ
Max
Unit
IIN1 = IIN3 = IIN4 = 0 µA
15
30
mA
IVCC1
IIN1 = IIN3 = IIN4 = 0 µA
4
6
mA
IVCC2
IIN1 = IIN3 = IIN4 = 0 µA
1
4
mA
VOOF-1
−30
0
30
mV
G1+
18.5
21.0
23.5
dB
Relative gain (+/−)
∆G1−
−3.0
0
3.0
dB
Limit voltage (+)
VL1+
6.5
8.0
V
Limit voltage (−)
VL1−
−8.0
−6.5
V
Driver 1
Output offset voltage
Gain (+)
Driver 2
Output voltage 1 (+)
V21+
VPC1 = 5 V, VPC2 = 0 V, VIN2 = 1 V,
RAS = 10 kΩ
2.4
2.7
3.0
V
Output voltage 1 (−)
V21−
VPC1 = 5 V, VPC2 = 0 V, VIN2 = 4 V,
RAS = 10 kΩ
−3.0
−2.7
−2.4
V
Output voltage 2 (+)
V22+
VPC1 = 5 V, VPC2 = 0 V, VIN2 = 1 V,
RAS = 0 kΩ
3.4
4.0
V
Output voltage 2 (−)
V22−
VPC1 = 5 V, VPC2 = 0 V, VIN2 = 4 V,
RAS = 0 kΩ
−4.0
−3.4
V
3
AN8783SB
ICs for Compact Disc/CD-ROM Player
■ Electrical Characteristics at SVCC = 12 V, VCC1 = 12 V, VCC2 = 5 V, RL = 8 Ω, VPC1 = 0 V, VPC2 = 5 V,
Ta = 25°C (continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
VBRK
VPC1 = 5 V, VPC2 = 0 V, VIN2 = 2.6 V,
IO = 200 mA
0.3
1.0
V
VPC1 = 5 V, VPC2 = 0 V, VIN2 = 5 V
40
100
µA
IDRV2
VPC2 = 5 V, VIN2 = 2.6 V
1.0
µA
VOOF3
RS3 = 0.5 Ω
−60
60
mV
Gain (+)
G3+
RS3 = 0.5 Ω
8.5
10.5
12.5
dB
Relative gain (+/−)
∆G3
RS3 = 0.5 Ω
−1.0
0
1.0
dB
Limit voltage (+)
VL3+
RS3 = 0.5 Ω
3.3
3.9
V
Limit voltage (−)
VL3−
RS3 = 0.5 Ω
−3.9
−3.3
V
Dead zone width
VDZ3
RS3 = 0.5 Ω
−5
15
45
mV
VOOF4
RS4 = 0.5 Ω
−60
60
mV
Gain (+)
G4+
RS4 = 0.5 Ω
8.5
10.5
12.5
dB
Relative gain (+/−)
∆G4
RS4 = 0.5 Ω
−1.0
0
1.0
dB
Limit voltage (+)
VL4+
RS4 = 0.5 Ω
3.3
3.9
V
Limit voltage (−)
VL4−
RS4 = 0.5 Ω
−3.9
−3.3
V
Dead zone width
VDZ4
RS4 = 0.5 Ω
−5
15
45
mV
Driver 2 (continued)
Braking ability
Input pin bias current
Driver-2 power transistor current
at power cut
IIN2
Driver 3
Output offset voltage
Driver 3
Output offset voltage
Power cut operation
PC1 threshold high-level voltage
VPC1H
3.5
V
PC1 threshold low-level voltage
VPC1L
1.0
V
PC2 threshold high-level voltage
VPC2H
3.5
V
PC2 threshold low-level voltage
VPC2L
1.0
V
PC1 input current
IPC1
70
120
µA
PC2 input current
IPC2
70
120
µA
VRST
5
V
VR
1.35
V
Reset circuit
Reset operation release supply
voltage
VREF detection voltage
4
ICs for Compact Disc/CD-ROM Player
AN8783SB
■ Electrical Characteristics at SVCC = 12 V, VCC1 = 12 V, VCC2 = 5 V, RL = 8 Ω, VPC1 = 0 V, VPC2 = 5 V,
Ta = 25°C (continued)
• Design reference data
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Thermal protection circuit
Thermal protection operating
temperature
TTHD
160
°C
Thermal protection hysteresis
width
∆TTHD
45
°C
VHYS
0.2
V
Reset circuit
Voltage detection reset
hysteresis width
■ Usage Notes
1. SVCC must be used in the highest potential. Otherwise it possibly causes an operation error.
2. Ch. 3 and ch. 4 are current feedback type drivers. Do not apply voltage directly to PVC3 and PVC4, but apply from
PVC2 through the current feedback detection resistors RS3 and RS4 , respectively. And commonly connect S3 pin
to PVC3 pin and S4 pin to PVC4 pin.
At this time, as an output current flows on the detection resistors RS3 and RS4, use a resistor which has a sufficient
allowable power dissipation.
RVC2
To set gain for ch. 3 and ch. 4, use the following formula:
| VIN3(4) −VREF |
× 2.2 kΩ = RS3(4) × IOUT3(4)
R3(4) + 500 Ω
(IOUT3 and IOUT4 are the load current for ch. 3 and ch. 4, respectively.)
RS3
S3
RS4
PVC3 PVC4
S4
3. Power cut operation
Power cut pins PC1 (for ch. 1, ch. 3, ch. 4) and PC2 (only for ch. 2) are high for mute and low for active.
While ch. 2 is exclusive to a loading motor, ch. 2, ch. 3 and, ch. 4 are driven by the output current from the same
source (PVC2). Therefore, do not use ch. 2 and ch. 3, ch. 4 simultaneously because noise is likely to be put on ch.
3, ch. 4 when ch. 2 is being drived.
4. Appropriate care should be taken on the characteristics.
When changing an external circuit constant on actual use, secure an appropriate margin in consideration of characteristic fluctuation of external parts and our ICs including transient characteristics as well as static ones.
5. Avoid the short-circuits between output pin and VCC , output pin and GND (line-to-supply and line-to-ground), and
between output pins (load short-circuit). Otherwise, the IC is likely to emit smoke and break down.
5
AN8783SB
ICs for Compact Disc/CD-ROM Player
■ Application Notes
• PD Ta curves of HSOP042-P-0400
PD T a
2.500
2.240
Power dissipation PD (W)
2.000
Mounted on standard board
(glass epoxy:
75 mm × 75 mm × t1.6 mm)
Rth(j-a) = 55.8°C/W
1.500
1.042
1.000
Independent IC
without a heat sink
Rth(j-a) = 119.9°C/W
0.500
0.000
25
0
50
75
100
125
150
Ambient temperature Ta (°C)
■ Application Circuit Example
RL1
RL2
V1
R3
V3
18
17
16
15
11
12
13
14
20
9
19
21
8
10
Fin
VCC1
Fin
22
VREF
7
24
5
R1
23
25
4
26
3
27
2
28
1
RC1
C1
VIN2
6
RAS
SVCC
R4
V4
RS3 RS4
RC2
C2
VCC2
RL4
RL3
When the AN8783SB is use, take into account the following cautions and follow the power dissipation characteristic curve.
1. Load current IP1 flowing into load RL1 is supplied through pin 21.
IP1 = | V20 −V18 | /RL1
2. Load current IP2 flowing into load RL2 is supplied through pin 16.
IP2 = | V17 −V15 | /RL2
3. Load current IP3 flowing into load RL3 is supplied through pin 13 via the resistor RS3.
IP3 = | V14 −V12 | /RL3
4. Load current IP4 flowing into load RL4 is supplied through pin 8 via the resistor RS4.
IP4 = | V10 −V9 | /RL4
6
ICs for Compact Disc/CD-ROM Player
AN8783SB
■ Application Circuit Example (continued)
5. Dissipation increase (∆PD) inside the IC (power output stage) caused by loads RL1, RL2, RL3 and RL4 is as follows:
| V20 −V18 |
| V −V12 |
| V14 −V12 |
∆PD = (VCC1 − | V20 −V18 |) ×
+ {VCC2 − (RS3 + RL3) × 14
}×
RL1
RL3
RL3
| V17 −V15 |
| V10 −V9 |
| V10 −V9 |
= (VCC2 − | V17 −V15 |) ×
+ {VCC2 − (RS4 + RL4) ×
}×
RL4
RL4
RL2
6. Dissipation increase (∆PS) inside the IC (signal block supplied from pin 28) caused by loads RL1, RL2, RL3 and RL4
comes roughly as follows:
V
I
∆PS = 3 × 1 × (2 × SVCC + | V20 −V18 | ) + P2 × (SVCC − | V17 −V15 | )
K
R1
IP3
IP4
+
× (SVCC − | V14 −V12 | ) +
× (SVCC − | V10 −V9 | ), where K ≈ 100
7. Dissipation increase in a driver operating mode is ∆PD + ∆PS .
8. Allowable power dissipation without load (PD1) can be found as follows:
PD1 = SVCC × I(SVCC) +VCC1 × I(VCC1) + VCC2 × I(VCC2)
9. Allowable power dissipation in a load operating mode (PD) comes roughly as follows:
PD = PD1 + ∆PD + ∆PS
7