Maintenance/ Discontinued

Transcription

1 ICs for Compact Disc/CD-ROM Player AN8783SB 4-channel linear driver IC for CD/CD-ROM drive Overview The AN8783SB employs one channel of power op-amp. system and three channels of H-bridge system. Two channels out of three channels of H- bridge 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. 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) Applications CD/CD-ROM drive 18.4±0.2 (5.15) (4.8) (1.2) ± ± ±0.2 (6.4) Seating plane HSOP042-P ± Unit: mm (1.315) 0 to ±0.20 1

2 AN8783SB ICs for Compact Disc/CD-ROM Player Block Diagram 21 PVC1 20 D1+ 18 D1 17 D2 15 D2+ 16 PVC D3+ D3 PVC3 S3 D4+ D4 PVC4 S4 PGND Fin 1/2 PV CC Reset SV CC Thermal protect SV CC monitor V REF monitor 27 N.C. Pin Descriptions Pin No. 23 IN1 25 AS BTL linear driver ch. 2 ch. 1 ch. 2 Direction det. Control current logic amp. Description 1 PC1 (power cut) input pin 24 IN2 2 Driver-3 phase compensation pin 3 Driver-3 input pin 4 Driver-4 input pin 5 Driver-3 feedback pin 6 Driver-4 feedback pin 7 Driver-4 phase compensation pin Comp. 26 PC2 8 Driver-4 current feedback power supply pin 9 Driver-4 reverse rotation output pin 10 Driver-4 forward rotation output pin 11 Driver-2, driver-4 GND pin 12 Driver-3 reverse rotation output pin 13 Driver-3 current feedback power supply pin 14 Driver-3 forward rotation output pin 15 Driver-2 forward rotation output pin BTL linear driver ch. 3 Absolute V-l direction det. 3 IN3 Pin No. ch. 3 BTL linear driver ch. 4 Absolute V-l direction det. 4 IN4 ch. 4 1 PC1 Description 16 Driver-2 power supply pin PGND2 V REF 17 Driver-2 reverse rotation output pin 18 Driver-1 reverse rotation output pin 19 Driver-1 GND pin 20 Driver-1 forward rotation output pin 21 Driver-1 power supply pin 22 V REF input pin 23 Driver-1 input pin 24 Driver-2 input pin 25 Driver-2 output voltage adjustment pin 26 PC2 (power cut) input pin 27 N.C. 28 Power supply pin Fin GND pin 2

3 ICs for Compact Disc/CD-ROM Player AN8783SB Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage SV CC 14.4 V Supply current I CC ma Power dissipation *2 P D 542 mw Operating ambient temperature * 1 Recommended Operating Range T opr 30 to +85 C Storage temperature *1 T stg 55 to +150 C Note) *1: Except for the operating ambient temperature and storage temperature, all ratings are for T a = 25 C. *2: Referring to " Application Circuit Example", use within the range of P D = 542 mw or less at T a = 85 C, following the allowable power dissipation characteristic curve of " Application Notes". Parameter Symbol Range Unit Supply voltage SV CC 6.4 to 14 V PV C1, PV C2 4.5 to 14 Electrical Characteristics at SV CC = 12 V, V CC1 = 12 V, V CC2 = 5 V, R L = 8 Ω, V PC1 = 0 V, V PC2 = 5 V, T a = 25 C Parameter Symbol Conditions Min Typ Max Unit Current consumption 1 with no I SVCC I IN1 = I IN3 = I IN4 = 0 µa ma signal Current consumption 2 with no I VCC1 I IN1 = I IN3 = I IN4 = 0 µa 4 6 ma signal Current consumption 3 with no I VCC2 I IN1 = I IN3 = I IN4 = 0 µa 1 4 ma signal Driver 1 Output offset voltage V OOF mv Gain (+) G db Relative gain (+/ ) G db Limit voltage (+) V L V Limit voltage ( ) V L V Driver 2 Output voltage 1 (+) V 21+ V PC1 = 5 V, V PC2 = 0 V, V IN2 = 1 V, V R AS = 10 kω Output voltage 1 ( ) V 21 V PC1 = 5 V, V PC2 = 0 V, V IN2 = 4 V, V R AS = 10 kω Output voltage 2 (+) V 22+ V PC1 = 5 V, V PC2 = 0 V, V IN2 = 1 V, V R AS = 0 kω Output voltage 2 ( ) V 22 V PC1 = 5 V, V PC2 = 0 V, V IN2 = 4 V, V R AS = 0 kω 3

4 AN8783SB ICs for Compact Disc/CD-ROM Player Electrical Characteristics at SV CC = 12 V, V CC1 = 12 V, V CC2 = 5 V, R L = 8 Ω, V PC1 = 0 V, V PC2 = 5 V, T a = 25 C (continued) Parameter Symbol Conditions Min Typ Max Unit Driver 2 (continued) Braking ability V BRK V PC1 = 5 V, V PC2 = 0 V, V IN2 = 2.6 V, V I O = 200 ma Input pin bias current I IN2 V PC1 = 5 V, V PC2 = 0 V, V IN2 = 5 V µa Driver-2 power transistor current I DRV2 V PC2 = 5 V, V IN2 = 2.6 V 1.0 µa at power cut Driver 3 Output offset voltage V OOF3 R S3 = 0.5 Ω mv Gain (+) G 3+ R S3 = 0.5 Ω db Relative gain (+/ ) G 3 R S3 = 0.5 Ω db Limit voltage (+) V L3+ R S3 = 0.5 Ω V Limit voltage ( ) V L3 R S3 = 0.5 Ω V Dead zone width V DZ3 R S3 = 0.5 Ω mv Driver 3 Output offset voltage V OOF4 R S4 = 0.5 Ω mv Gain (+) G 4+ R S4 = 0.5 Ω db Relative gain (+/ ) G 4 R S4 = 0.5 Ω db Limit voltage (+) V L4+ R S4 = 0.5 Ω V Limit voltage ( ) V L4 R S4 = 0.5 Ω V Dead zone width V DZ4 R S4 = 0.5 Ω mv Power cut operation PC1 threshold high-level voltage V PC1H 3.5 V PC1 threshold low-level voltage V PC1L 1.0 V PC2 threshold high-level voltage V PC2H 3.5 V PC2 threshold low-level voltage V PC2L 1.0 V PC1 input current I PC µa PC2 input current I PC µa Reset circuit Reset operation release supply V RST 5 V voltage V REF detection voltage V R 1.35 V 4

5 ICs for Compact Disc/CD-ROM Player AN8783SB Electrical Characteristics at SV CC = 12 V, V CC1 = 12 V, V CC2 = 5 V, R L = 8 Ω, V PC1 = 0 V, V PC2 = 5 V, T a = 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 T THD 160 C temperature Thermal protection hysteresis T THD 45 C width Reset circuit Voltage detection reset V HYS 0.2 V hysteresis width Usage Notes 1. SV CC 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: V IN3(4) V REF 2.2 kω = R S3(4) I OUT3(4) R 3(4) Ω (I OUT3 and I OUT4 are the load current for ch. 3 and ch. 4, respectively.) 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 V CC, 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. S3 RS3 PVC3 PVC4 RS4 S4 5

6 AN8783SB ICs for Compact Disc/CD-ROM Player Application Notes P D T a curves of HSOP042-P-0400 P D T a Power dissipation P D (W) Application Circuit Example 1 28 SV CC 27 2 RC1 C R3 RAS V R V4 V IN V CC2 Independent IC without a heat sink Rth(j-a) = C/W R1 Mounted on standard board (glass epoxy: 75 mm 75 mm t1.6 mm) Rth(j-a) = 55.8 C/W RS3 V1 Ambient temperature T a ( C) RS V REF Fin Fin RC2 C V CC RL4 RL RL2 16 When the AN8783SB is use, take into account the following cautions and follow the power dissipation characteristic curve. 1. Load current I P1 flowing into load RL1 is supplied through pin 21. I P1 = V 20 V 18 /R L1 2. Load current I P2 flowing into load RL2 is supplied through pin 16. I P2 = V 17 V 15 /R L2 3. Load current I P3 flowing into load RL3 is supplied through pin 13 via the resistor RS3. I P3 = V 14 V 12 /R L3 4. Load current I P4 flowing into load RL4 is supplied through pin 8 via the resistor RS4. I P4 = V 10 V 9 /R L4 13 RL

7 ICs for Compact Disc/CD-ROM Player AN8783SB Application Circuit Example (continued) 5. Dissipation increase ( P D ) inside the IC (power output stage) caused by loads RL1, RL2, RL3 and RL4 is as follows: P D = (V CC1 V 20 V 18 ) V 20 V 18 + {V CC2 (R S3 + R L3 ) V 14 V 12 V } 14 V 12 R L1 R L3 R L3 = (V CC2 V 17 V 15 ) V 17 V 15 + {V CC2 (R S4 + R L4 ) V 10 V 9 V } 10 V 9 R L2 R L4 R L4 6. Dissipation increase ( P S ) inside the IC (signal block supplied from pin 28) caused by loads RL1, RL2, RL3 and RL4 comes roughly as follows: P S = 3 V1 (2 SV CC + V 20 V 18 ) + I P2 (SV CC V 17 V 15 ) R 1 K + I P3 (SV CC V 14 V 12 ) + I P4 (SV CC V 10 V 9 ), where K Dissipation increase in a driver operating mode is P D + P S. 8. Allowable power dissipation without load (P D1 ) can be found as follows: P D1 = SV CC I (SVCC) +V CC1 I (VCC1) + V CC2 I (VCC2) 9. Allowable power dissipation in a load operating mode (P D ) comes roughly as follows: P D = P D1 + P D + P S 7

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