AN8737SB PANASONIC

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Technical content

ICs for Optical Disk Drive AN8737SB 3-channel driver IC for optical disk drive n Overview The AN8737SB is a BTL type 3-channel driver IC, adopting a current feedback system for 2 chan- nels, which makes it optimum for an actuator and a motor driver of CD-ROM/DVD-ROM. It can also constitute an optimum system in combination with the AN8488SB, a spindle plus loading driver IC. A surface mount-type package of good heat radiation characteristic is used. n Features

  • Little phase delay due to a current feedback system (2 channels for actuator)
  • The remaining channel is available for either traverse or loading motor drive.
  • Wide output dynamic range (4 V/IO = 800 mA)
  • Standby function built in (all channels can be muted.)
  • Thermal shut-down circuit built in
  • With thermal flag pin n Applications
  • CD/CD-ROM player
  • DVD/DVD-ROM drive HSOP042-P-0400 Unit: mm 17 8 1 4 (1.315) 0.65±0.20 28 22 21 (4.8) (6.4)(1.2) (5.15) 18.4±0.2 10.93±0.30 0.35+0.10 –0.05 0.30 +0.10 –0.05

0.8 Seating plane

0° to 10°

AN8737SB ICs for Optical Disk Drive n Block Diagram 13PGND1 26V REF

17 PGND2

9 VO1 -

5 VS1

8 PV CC1

12 VO1 +

28 VS2

14 VO2 -

18 PC2

10N.C. V CC V CC det. Reset V REF reset Temp. det.

2 V CC

Pin No. Description 16 Ch. 3 reverse direction output pin 17 Ch. 3 power side grounding pin 18 Ch. 3 mute pin 19 Ch. 3 forward direction output pin

20 TDS flag pin

21 Ch. 3 power side power supply pin 22 N.C. 23 Ch. 3 reverse rotation input pin

24 Standby input pin

25 Ch. 3 forward rotation input pin

26 Reference voltage input pin

27 Ch. 2 current feedback output pin 28 Ch. 2 current feedback input pin Fin Control side grounding pin n Pin Descriptions Pin No. Description 1 Ch. 2 first stage feedback pin 2 Ch. 2 first stage input pin 3 Ch. 1 first stage input pin 4 Ch. 1 first stage feedback pin 5 Ch. 1 current feedback input pin 6 Ch. 1 current feedback output pin

7 Control side power supply pin

8 Ch. 1 & ch. 2 power side power supply pin 9 Ch. 1 reverse direction output pin 10 N.C. 11 Ch. 1 & Ch. 2 mute pin 12 Ch. 2 forward direction output pin 13 Ch. 1 & ch. 2 power side grounding pin 14 Ch. 2 reverse direction output pin 15 Ch. 2 forward direction output pin

ICs for Optical Disk Drive AN8737SB Parameter Symbol Range Unit Supply voltage SV CC 4.5 to 13.5 V PV CC1 , PVCC2 3.5 to 13.5 n Recommended Operating Range Parameter Symbol Rating Unit Supply voltage V CC 14.0 V Supply voltage range SV CC , PVCC1 , PVCC2 - 0.3 to +14.0 V Supply current *2 ISVCC 500 mA IPVCC1 2.0 A IPVCC2 800 mA Power dissipation *3 PD 542 mW Operating ambient temperature *1 Topr -30 to +85 °C Storage temperature *1 T stg -55 to +150 °C n Absolute Maximum Ratings Note) *1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. *2: IPVCC1 be 1 A or less for channel 1 and channel 2, respectively. *3: Use within the range of PD = 542 mW or less at Ta = 85°C, following the allowable power dissipation characteristic curve of "n Application Notes". n Electrical Characteristics at SVCC = 12 V, PVCC1 = 5 V, PVCC2 = 5 V, RL = 8 W , VREF = 1.65 V, VSB = VPC1 = VPC2 = 3.3 V, VIN1 = VIN2 = VIN3 = 1.65 V, Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Current consumption 1 I SVO V IN1 = VIN2 = VREF , VIN3P = 2.5 V ¾ 25 45 mA (no signal) V SB = VPC1 = VPC2 = 3.3 V Current consumption 2 I PVO V IN1 = VIN2 = VREF , VIN3P = 2.5 V ¾ 25 45 mA (no signal) V SB = VPC1 = VPC2 = 3.3 V Current consumption 1 I SVSB V IN1 = VIN2 = VREF , VIN3P = 2.5 V ¾ 0.6 1.5 mA (standby) V SB = VPC1 = VPC2 = 0 V Current consumption 2 I PVSB V IN1 = VIN2 = VREF , VIN3P = 2.5 V ¾ 0.2 1.0 mA (standby) V SB = VPC1 = VPC2 = 0 V Driver 1, Driver 2 R L1 , RL2 = 4 W , RS1 , RS2 = 0.5 W , RIN1 , RIN2 = 10 kW , RF1 , RF2 = 4.3 kW Output offset voltage V OF1 V IN = VREF -100 0 100 mV Gain (+)G 1 + V IN = VREF –50 mV 9 11 13 dB Relative gain (+/-)G 1 -1.5 ¾+ 1.5 dB Maximum output amplitude (+)V L1+ V IN = 3.3 V, RL1 , RL2 = 4 W 3.65 4.0 ¾ V R S1 , RS2 = 0.5 W Maximum output amplitude (-)V L1- V IN = 0 V, RL1 , RL2 = 4 W¾ - 4.0 -3.65 V R S1 , RS2 = 0.5 W

AN8737SB ICs for Optical Disk Drive n Electrical Characteristics at SVCC = 12 V, PVCC1 = 5 V, PVCC2 = 5 V, RL = 8 W , VREF = 1.65 V, VSB = VPC1 = VPC2 = 3.3 V, VIN1 = VIN2 = VIN3 = 1.65 V, Ta = 25°C (continued) Parameter Symbol Conditions Min Typ Max Unit Driver 3 R L = 8 W Output offset voltage V OF3 V IN3P = VIN3N = 2.5 V -150 0 150 mV Gain (+)G 3 + V IN3P = 2.5 V, VIN3P = 2.5 V–50 mV 19 20.5 22 dB No external resistor Relative gain (+/-)G 3 -1.5 ¾+ 1.5 dB Output voltage (+)V 3+ V IN3N = 5 V, 3.05 3.4 3.75 V R A1 = 27 kW , RA2 = 6.8 kW Output voltage (-)V 3- V IN3N = 0 V, -3.75 -3.4 -3.05 V R A1 = 27 kW , RA2 = 6.8 kW Input pin bias current I IN3 V IN3N = 0 V ¾¾ 1 mA Standby operation High: Active, low or Hi-Z: Standby High-level SB threshold voltage VSBH SV CC = 12 V 2.6 ¾¾ V Low-level SB threshold voltage VSBL SV CC = 12 V ¾¾ 0.7 V SB input current I SB V SB = 5 V ¾ 50 120 mA Power cut operation High: Active, low or Hiz: Power cut High-level PC1 threshold voltage VPC1H SV CC = 12 V 2.6 ¾¾ V Low-level PC1 threshold voltage VPC1L SV CC = 12 V ¾¾ 0.7 V High-level PC2 threshold voltage VPC2H SV CC = 12 V 2.6 ¾¾ V Low-level PC2 threshold voltage VPC2L SV CC = 12 V ¾¾ 0.7 V PC1 input current I PC1 V PC1 = 5 V ¾ 70 120 mA PC2 input current I PC2 V PC2 = 5 V ¾ 70 120 mA Reset current Reset operation release supply VRST ¾¾ 4.5 V voltage V REF detection voltage V R 1.20 ¾¾ V Parameter Symbol Conditions Min Typ Max Unit Thermal protection circuit Operating temperature T THD ¾ 160 ¾° C equilibrium value Operating temperature DTTHD ¾ 40 ¾° C hysteresis width Temperature flag balancing T FLG ¾ 150 ¾° C value Temperature flag hysteresis DTFLG ¾ 20 ¾° C width

  • Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.

ICs for Optical Disk Drive AN8737SB Parameter Symbol Conditions Min Typ Max Unit Thermal protection circuit (continued) Operating temperature difference bet.DTTF ¾ 10 ¾° C thermal protection/temperature flag Temperature flag output high VFLH SV CC = 12 V ¾ 5 ¾ V value Supply voltage detection hysteresisDV HD ¾ 0.2 ¾ V width n Usage Notes 1. Use SV CC at the maximum potential. Otherwise it will cause operation error. 2. Do not use PVCC1 and PVCC2 at 2 V or less, or at the high impedance. 3. Driver 1, driver 2 gain setting (Use a resistor of sufficient power dissipation for RS .) 4. On the mode of mute: SB = PC1 = high SB = PC1 = low or Hi-Z PC2 = high PC2 = low or Hi-Z ¾ Ch. 1, Ch. 2 Active Active All mute, Ch. 3 Active Mute power save Never fail to input the same signal into SB pin (pin 24) and PC1 pin (pin 11).

  • Design reference data (continued) Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. n Electrical Characteristics at SVCC = 12 V, PVCC1 = 5 V, PVCC2 = 5 V, RL = 8 W , VREF = 1.65 V, VSB = VPC1 = VPC2 = 3.3 V, VIN1 = VIN2 = VIN3 = 1.65 V, Ta = 25°C (continued) 500 W 4 W Forward rotation pin Reverse rotation pin Input pin 0.5 W R LR IN R E C E V IN R FB R S

500 W3 or 2

12 or 15· 5

  • 5 4 or 1 9 or 14 5 or 286 or 27 V REF V REF Pwr. amp. 200 W V REF

AN8737SB ICs for Optical Disk Drive n Usage Notes (continued) 5. On the output maximum amplitude (Reference data: typical value) Use load current at 1 A or less. 6 Appropriate care should be taken on the characteristics. When changing an external circuit constant on actual use, secure an appropriate margin in consideration of charac- teristic fluctuation of external parts and our ICs including transient characteristics as well as static ones.

7 Avoid the short-circuits between output pin or current detection pin and V

CC (line-to-supply fault), output pin or current detection pin and GND (line-to-ground fault), and output pins or output pin and current detection pin (load short-ciruit). 8 An appropriate prior study should be done for use of dip soldering. 9 Care should be taken on use of the following pin because of its low static breakdown voltage (C = 200 pF, R = 0 W ). Pin 18: Breakdown at 200 V Load current (A) Output maximum amplitude (V) 4.5 5.0 4.0 3.5 3.0

ICs for Optical Disk Drive AN8737SB n Application Notes

  • PD ¾ Ta curves of HSOP042-P-0400 PD ¾ Ta 0.000 0 25 50 75 100 125 150 2.500 1.500 1.000 2.240 2.000 1.042 0.500 Ambient temperature Ta (°C) Power dissipation PD (W) Mounted on standard board (glass epoxy: 75 mm · 75 mm · t1.6 mm) R th(j-a) = 55.8°C/W Independent IC without a heat sink R th(j-a) = 119.9°C/W

AN8737SB ICs for Optical Disk Drive n Application Circuit Example 1 15 11 7 24 20 23 16 25 19 Fin 21 V CC V CC det. Reset V REF reset Temp. det. N.C. 1.65 V V REF PGND1 PGND2 PC2 VRB1 PV CC1 IN1 VO1 - OUT1 VS1 OUT2 VO1 + IN2 VO2 + VFB2 VS2 PC1 VO2 - SB SV CC IN3N TFLG High: High temp. High: Active Low : All mute power save IN3P VO3 - SGND VO3 + PV CC2 Snubber R S1 0.5 W R L2 8.0 W 6.8 kW 27 kW R IN2 = 10 kW R IN2 = 10 kW 4.3 kW 4.7 kW 560 pF R L2 4.0 W R L1 4.0 W R S2 0.5 W Snubber 4.7 kW 560 pF 4.3 kW 5 V 12 V 5 V