ICs for Compact Disc/CD-ROM Player
AN8787NSB
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 AN8787NSB is a 4-channel driver IC that
has 2-channel of H-bridge method actuator driver
with current feedback, one channel of BTL type
traverse driver and one channel of tri-state output
type loading driver. It is optimum for actuator or
motor driver of CD/CD-ROM player. It comes with
a surface mount package that excels in heat radiating characteristic.
0° to 10°
1
7
8
14
■ Features
• Little phase delay due to current feedback method
(2-channel for actuator)
• Channels for loading motor (H-bridge system) are
available for three modes of forward rotation, reverse rotation and braking
• Muting SW with 2 modes: A loading channel is in
operation, and the other 3 channels are in muting;
Loading is in muting and the other 3 channels are
in operation.
• Standby switch to stop all functions
• Wide output dynamic range is available regardless of a reference power source on the system.
• I/O gain setting by an external resistor
• 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
• DVD/DVD-ROM drive
1
AN8787NSB
ICs for Compact Disc/CD-ROM Player
19
ch. 1
Reset
SVCC
27
SVCC
5
S4
PVC4
9
D4−
8
D4+
10
S3
4
PVC3
D3−
BTL linear
driver
ch. 3
BTL linear
driver
ch. 4
11
ch. 2
Direction
det.
current
amp.
13
12
D3+
14
PVC5
7
PVC2
16
D2+
BTL linear
driver
ch. 2
1
2 PVCC
PGND1
15
D2−
17
D1−
18
D1+
20
21
PVC1
■ Block Diagram
ch. 3
ch. 4
PGND2
6
Control
logic
1
Thermal
protect
Absolute
V-I
direction
det.
SVCC
monitor
Fin
Absolute
V-I
direction
det.
Comp.
VREF
monitor
22
VREF
PC
28
IN4
3
IN3
2
24
IN2
AS
25
23
IN1
STB
26
Standby
■ Pin Descriptions
Pin No.
2
Description
Pin No.
Description
1
Driver-3 phase compensation pin
16
Driver-2 power supply pin
2
Driver-3 input pin
17
Driver-2 reverse rotation output pin
3
Driver-4 input pin
18
Driver-1 reverse rotation output pin
4
Driver-3 feedback pin
19
Driver-1 GND pin
5
Driver-4 feedback pin
20
Driver-1 forward rotation output pin
6
Driver-4 phase compensation pin
21
Driver-1 power supply pin
7
Driver-3, driver-4 power supply pin
22
VREF input pin
8
Driver-4 reverse rotation output pin
23
Driver-1 input pin
9
Driver-4 current feedback power supply 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
Standby input pin
12
Driver-3 reverse rotation output pin
27
System power supply pin
13
Driver-3 current feedback power supply pin
28
PC (power cut) input 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
AN8787NSB
■ 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
582
mW
Topr
−30 to +85
°C
Tstg
−55 to +150
°C
Note) *1: Except for the power dissipation, 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 = 582 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 , PVC5
4.5 to 14
*
Note) *: Refer to "■ Application Circuit Example".
■ Electrical Characteristics at SVCC = VCC1 = VCC2 = 12 V, VCC3 = 5 V, RL = 8 Ω, VPC = 5 V, VSTB = 5 V,
Ta = 25°C
Parameter
Symbol
Current consumption 1 with no
signal
ISVCC
Current consumption 2 with no
signal
Conditions
Min
Typ
Max
Unit
VPC = 5 V, VSTB = 5 V
13
30
mA
IVCC1
VPC = 5 V, VSTB = 5 V
4
6
mA
Current consumption 3 with no
signal
IVCC2
VPC = 0 V, VSTB = 5 V
1
4
mA
Current consumption 4 with no
signal
IVCC3
VPC = 5 V, VSTB = 5 V
1
4
mA
Current consumption with no
signal at standby 1
ISVCC-S VPC = 5 V, VSTB = 0 V
3
6
mA
Current consumption with no
signal at standby 2
IVCC1-S VPC = 5 V, VSTB = 0 V
1
3
mA
VOOF-1
−30
0
30
mV
G1+
18.5
21.0
23.5
dB
Relative gain (+/−)
∆G1−
−2.8
0
2.8
dB
Limit voltage (+)
VL1+
6.5
8.0
V
Limit voltage (−)
VL1−
−8.0
−6.5
V
Driver 1
Output offset voltage
Gain (+)
3
AN8787NSB
ICs for Compact Disc/CD-ROM Player
■ Electrical Characteristics at SVCC = VCC1 = VCC2 = 12 V, VCC3 = 5 V, RL = 8 Ω, VPC = 5 V, VSTB = 5 V,
Ta = 25°C (continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Driver 2
Output voltage 1 (+)
V21+
VCC2 = 5 V, VPC = 0 V
VIN2 = 4 V, RAS = 10 kΩ
2.5
2.8
3.1
V
Output voltage 1 (−)
V21−
VCC2 = 5 V, VPC = 0 V
VIN2 = 1 V, RAS = 10 kΩ
−3.1
−2.8
−2.5
V
Output voltage 2 (+)
V22+
VCC2 = 5 V, VPC = 0 V
VIN2 = 4 V, RAS = 0 kΩ
3.4
4.0
4.6
V
Output voltage 2 (−)
V22−
VCC2 = 5 V, VPC = 0 V
VIN2 = 1 V, RAS = 0 kΩ
−4.6
−4.0
−3.4
V
Braking ability
VBRK
VCC2 = 5 V, VPC = 0 V
IIN2 = 0 µA, IO = 200 mA
0.3
1.0
V
Input pin bias current
IIN2
VCC2 = 5 V, VPC = 0 V, VIN2 = 5 V
40
100
µA
Driver-2 power transistor current
at power cut
Idrv2
VPC = 5 V, IIN2 = 0 µA
1.0
µA
VOOF-3
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
−1.3
0
1.3
dB
Limit voltage (+)
VL3+
RS3 = 0.5 Ω
3.4
3.9
V
Limit voltage (−)
VL3−
RS3 = 0.5 Ω
−3.9
−3.4
V
Dead zone width
VDZ3
RS3 = 0.5 Ω
−5
15
45
mV
VOOF-4
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
−1.3
0
1.3
dB
Limit voltage (+)
VL4+
RS4 = 0.5 Ω
3.4
3.9
V
Limit voltage (−)
VL4−
RS4 = 0.5 Ω
−3.9
−3.4
V
Dead zone width
VDZ4
RS4 = 0.5 Ω
−5
15
45
mV
Driver 3
Output offset voltage
Driver 4
Output offset voltage
Power cut operation
PC threshold high-level voltage
VPCH
3.5
V
PC threshold low-level voltage
VPCL
1.0
V
IPC
70
120
µA
STB threshold high-level voltage VSTBH
3.5
V
STB threshold low-level voltage
VSTBL
1.0
V
ISTB
3
µA
PC input current
Standby operation
STB pin source current
4
ICs for Compact Disc/CD-ROM Player
AN8787NSB
■ Electrical Characteristics at SVCC = VCC1 = VCC2 = 12 V, VCC3 = 5 V, RL = 8 Ω, VPC = 5 V, VSTB = 5 V,
Ta = 25°C (continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
VRST
5
V
VR
1.35
V
Reset circuit
Reset operation release supply
voltage
VREF detection voltage
• 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
PVC5 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.
RVC5
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
PC
Standby
Low (open)
High
Low
High (open)
Ch. 1, Ch. 3, Ch. 4
Mute
Active
Standby
Active
Ch. 2
(exclusive for L0)
Active
Mute
or
Mute
4. Do not use ch. 2 (exclusive for loading) at more than 6 V of V CC2 when ch. 2 load is 20 Ω and less.
5. 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.
6. Avoid the short-circuits between output pin and VCC , output pin and GND (line-to-supply and line-to-ground), and
between output pins (short-circuit due to load). Otherwise, the IC is likely to emit smoke and break down.
7. An appropriate prior study should be done for use of dip soldering.
5
AN8787NSB
ICs for Compact Disc/CD-ROM Player
■ Application Notes
• PD Ta curves of HSOP042-P-0400
PD T a
3 000
Rth(j−c) = 16°C/W
2 800
Power dissipation PD (mW)
2 600
2 561
2 400
Glass epoxy both side copper foil PCB
(75 mm × 75 mm × t1.6 mm)
Rth(j-a) = 48.8°C/W
PD = 2 561 mW (25°C)
2 200
2 000
1 800
1 600
1 400
1 200
1 120
1 000
Independent IC
without a heat shink
Rth(j-a) = 111.6°C/W
PD = 1 120 mW (25°C)
800
600
400
200
0
0
25
50
75
100
125
150
Ambient temperature Ta (°C)
■ Application Circuit Example
RL1
RL2
V1
VREF
Fin
21
20
19
18
17
16
15
Fin
8
9
10
11
12
13
14
VCC1
22
23
6
VCC2
7
R1
24
25
4
VIN2
5
26
3
27
2
1
28
SVCC
RAS
RC3
C3
R3
RC4
R4
V3
V4
RS3 RS4
VCC3
C4
RL4
RL3
When the AN8787NSB 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.
| V20 −V18 |
IP1 =
RL1
2. Load current IP2 flowing into load RL2 is supplied through pin 16.
| V17 −V15 |
IP2 =
RL2
6
ICs for Compact Disc/CD-ROM Player
AN8787NSB
■ Application Circuit Example (continued)
3. Load current IP3 flowing into load RL3 is supplied through pin 13 via the resistor RS3.
| V14 −V12 |
IP3 =
RL3
4. Load current IP4 flowing into load RL4 is supplied through pin 9 via the resistor RS4.
| V10 −V8 |
IP4 =
RL4
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 |) ×
+ {VCC3 − (RS3 + RL3) × 14
}×
RL1
RL3
RL3
| V17 −V15 |
| V10 −V8 |
| V10 −V8 |
+ (VCC2 − | V17 −V15 |) ×
+ {VCC3 − (RS4 + RL4) ×
}×
RL2
RL4
RL4
6. Dissipation increase (∆PS) inside the IC (signal block supplied from pin 27) 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 −V8 | ), where K ≈ 100
K
K
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) +VCC3 × I(VCC3)
9. Allowable power dissipation in a load operating mode (PD) comes roughly as follows:
PD = PD1 + ∆PD + ∆PS
7