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ICs for Compact Disc/CD-ROM Player
AN8787NSB
4-channel linear driver IC for CD/CD-ROM drive
s Overview
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.
18.40.2 (5.15) (4.8) 28 22 21 15 (1.315)
8.30.2 10.930.30
Unit: mm
0.30-0.05
+0.10
0 to 10 1 7 8 14 0.650.20
2.70.2
s 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)
(1.2) 0.8 (6.4) 0.35+0.10 -0.05 Seating plane
HSOP042-P-0400
s Applications
* CD/CD-ROM drive * DVD/DVD-ROM drive
0.10.1
1
AN8787NSB
s Block Diagram
PVC1 PVC2 PVC5
ICs for Compact Disc/CD-ROM Player
PVC3
PVC4 9
D1+
D1-
D2-
D2+
D3+
D3-
D4+
D4-
S3
8
21
20
18
17
15
16
7
14
12
13
4
1 2 PVCC PGND1 19 ch. 1 Reset SVCC 27 SVCC Thermal protect SVCC monitor Fin VREF monitor Standby Direction det. current amp.
BTL linear driver ch. 2 ch. 2 Control logic
BTL linear driver ch. 3
10
BTL linear driver ch. 4 11 PGND2
ch. 3
ch. 4
5
6
1
Absolute V-I direction det.
Comp.
Absolute V-I direction det.
S4
22 VREF
26
23
25
24
2
3
STB
IN1
AS
IN2
IN3
s Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Description Driver-3 phase compensation pin Driver-3 input pin Driver-4 input pin Driver-3 feedback pin Driver-4 feedback pin Driver-4 phase compensation pin Driver-3, driver-4 power supply pin Driver-4 reverse rotation output pin Driver-4 current feedback power supply pin Driver-4 forward rotation output pin Driver-2, driver-4 GND pin Driver-3 reverse rotation output pin Driver-3 current feedback power supply pin Driver-3 forward rotation output pin Driver-2 forward rotation output pin Pin No. 16 17 18 19 20 21 22 23 24 25 26 27 28 Fin Description Driver-2 power supply pin Driver-2 reverse rotation output pin Driver-1 reverse rotation output pin Driver-1 GND pin Driver-1 forward rotation output pin Driver-1 power supply pin VREF input pin Driver-1 input pin Driver-2 input pin Driver-2 output voltage adjustment pin Standby input pin System power supply pin PC (power cut) input pin GND pin
2
IN4
PC
28
ICs for Compact Disc/CD-ROM Player
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation
*2 *1
AN8787NSB
Symbol SVCC ICC PD Topr Tstg
Rating 14.4 582 -30 to +85 -55 to +150
Unit V mA mW C C
Operating ambient temperature Storage temperature
*1
Note) *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for Ta = 25C. *2: Referring to "s Application Circuit Example", use within the range of PD = 582 mW or less at Ta = 85C, following the allowable power dissipation characteristic curve of "s Application Notes".
s Recommended Operating Range
Parameter Supply voltage
*
Symbol SVCC PVC1 , PVC2 , PVC5
Range 6.4 to 14 4.5 to 14
Unit V
Note) *: Refer to "s Application Circuit Example".
s Electrical Characteristics at SVCC = VCC1 = VCC2 = 12 V, VCC3 = 5 V, RL = 8 , VPC = 5 V, VSTB = 5 V, Ta = 25C
Parameter Current consumption 1 with no signal Current consumption 2 with no signal Current consumption 3 with no signal Current consumption 4 with no signal Current consumption with no signal at standby 1 Current consumption with no signal at standby 2 Driver 1 Output offset voltage Gain (+) Relative gain (+/-) Limit voltage (+) Limit voltage (-) VOOF-1 G1+ G1- VL1+ VL1- -30 18.5 -2.8 6.5 0 21.0 0 8.0 -8.0 30 23.5 2.8 -6.5 mV dB dB V V Symbol ISVCC IVCC1 IVCC2 IVCC3 Conditions VPC = 5 V, VSTB = 5 V VPC = 5 V, VSTB = 5 V VPC = 0 V, VSTB = 5 V VPC = 5 V, VSTB = 5 V Min Typ 13 4 1 1 3 1 Max 30 6 4 4 6 3 Unit mA mA mA mA mA mA
ISVCC-S VPC = 5 V, VSTB = 0 V IVCC1-S VPC = 5 V, VSTB = 0 V
3
AN8787NSB
ICs for Compact Disc/CD-ROM Player
s Electrical Characteristics at SVCC = VCC1 = VCC2 = 12 V, VCC3 = 5 V, RL = 8 , VPC = 5 V, VSTB = 5 V, Ta = 25C (continued)
Parameter Driver 2 Output voltage 1 (+) Output voltage 1 (-) Output voltage 2 (+) Output voltage 2 (-) Braking ability Input pin bias current Driver-2 power transistor current at power cut Driver 3 Output offset voltage Gain (+) Relative gain (+/-) Limit voltage (+) Limit voltage (-) Dead zone width Driver 4 Output offset voltage Gain (+) Relative gain (+/-) Limit voltage (+) Limit voltage (-) Dead zone width Power cut operation PC threshold high-level voltage PC threshold low-level voltage PC input current Standby operation STB threshold high-level voltage VSTBH STB threshold low-level voltage STB pin source current VSTBL ISTB 3.5 1.0 3 V V A VPCH VPCL IPC 3.5 70 1.0 120 V V A VOOF-4 G4+ G4 VL4+ VL4- VDZ4 RS4 = 0.5 RS4 = 0.5 RS4 = 0.5 RS4 = 0.5 RS4 = 0.5 RS4 = 0.5 -60 8.5 -1.3 3.4 -5 10.5 0 3.9 -3.9 15 60 12.5 1.3 -3.4 45 mV dB dB V V mV VOOF-3 G3+ G3 VL3+ VL3- VDZ3 RS3 = 0.5 RS3 = 0.5 RS3 = 0.5 RS3 = 0.5 RS3 = 0.5 RS3 = 0.5 -60 8.5 -1.3 3.4 -5 10.5 0 3.9 -3.9 15 60 12.5 1.3 -3.4 45 mV dB dB V V mV V21+ V21- V22+ V22- VBRK IIN2 Idrv2 VCC2 = 5 V, VPC = 0 V VIN2 = 4 V, RAS = 10 k VCC2 = 5 V, VPC = 0 V VIN2 = 1 V, RAS = 10 k VCC2 = 5 V, VPC = 0 V VIN2 = 4 V, RAS = 0 k VCC2 = 5 V, VPC = 0 V VIN2 = 1 V, RAS = 0 k VCC2 = 5 V, VPC = 0 V IIN2 = 0 A, IO = 200 mA VCC2 = 5 V, VPC = 0 V, VIN2 = 5 V VPC = 5 V, IIN2 = 0 A 2.5 -3.1 3.4 -4.6 2.8 -2.8 4.0 -4.0 0.3 40 3.1 -2.5 4.6 -3.4 1.0 100 1.0 V V V V V A A Symbol Conditions Min Typ Max Unit
4
ICs for Compact Disc/CD-ROM Player
AN8787NSB
s Electrical Characteristics at SVCC = VCC1 = VCC2 = 12 V, VCC3 = 5 V, RL = 8 , VPC = 5 V, VSTB = 5 V, Ta = 25C (continued)
Parameter 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.
Symbol
Conditions
Min 1.35
Typ
Max
Unit
VRST VR
5
V V
Parameter Thermal protection circuit Thermal protection operating temperature Thermal protection hysteresis width Reset circuit Voltage detection reset hysteresis width
Symbol
Conditions
Min
Typ
Max
Unit C C
TTHD TTHD
160 45
VHYS
0.2
V
s 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 | x 2.2 k = RS3(4) x IOUT3(4) R3(4) + 500 (IOUT3 and IOUT4 are the load current for ch. 3 and ch. 4, respectively.) 3. Power cut operation PC Low (open) Ch. 1, Ch. 3, Ch. 4 Ch. 2 (exclusive for L0) Mute Active High Active Mute Low Standby Standby High (open) Active or Mute
RS3
RS4
S3
PVC3 PVC4
S4
4. Do not use ch. 2 (exclusive for loading) at more than 6 V of V CC2 when ch. 2 load is 20 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
s Application Notes
* PD Ta curves of HSOP042-P-0400
ICs for Compact Disc/CD-ROM Player
PD T a
3 000 2 800 2 600 2 561 2 400 Rth(j-c) = 16C/W
Power dissipation PD (mW)
2 200 2 000 1 800 1 600 1 400 1 200 1 120 1 000 800 600 400 200 0 0 25
Glass epoxy both side copper foil PCB (75 mm x 75 mm x t1.6 mm) Rth(j-a) = 48.8C/W PD = 2 561 mW (25C)
Independent IC without a heat shink Rth(j-a) = 111.6C/W PD = 1 120 mW (25C)
50
75
100
125
150
Ambient temperature Ta (C)
s Application Circuit Example
RL1
V1
RL2 VCC2
SVCC
28 27 26
RAS VIN2
25 24
R1
22 23
VREF
21 Fin
VCC1
19 18 17 16 13 20 15 14
Fin
10
11
RC3 C3 R3
V3
R4
V4
RC4 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
12
1
2
3
4
5
6
7
8
9
ICs for Compact Disc/CD-ROM Player
s 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
AN8787NSB
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 |) x + {VCC3 - (RS3 + RL3) x 14 }x RL1 RL3 RL3 | V17 -V15 | | V10 -V8 | | V10 -V8 | + (VCC2 - | V17 -V15 |) x + {VCC3 - (RS4 + RL4) x }x 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 x 1 x (2 x SVCC + | V20 -V18 | ) + P2 x (SVCC - | V17 -V15 | ) K R1 IP3 IP4 + x (SVCC - | V14 -V12 | ) + x (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 x I(SVCC) +VCC1 x I(VCC1) + VCC2 x I(VCC2) +VCC3 x I(VCC3) 9. Allowable power dissipation in a load operating mode (PD) comes roughly as follows: PD = PD1 + PD + PS
7

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