ICs for CD/CD-ROM Player AN8387S 2-channel Linear Driver ■ Overview 0.2 5.5±0.3 7.6±0.3 (0.4) 2.05±0.2 + 0.1 – 0.05 0.1±0.1 (maximun drive current : 500mA) Quiescent current (current consumption at no input) ; 3.2mA • Provided with power control pin • Provided with driver output voltage limiting pin • Built-in thermal protective circuit (operating temperature : 160°C typ.) • 0.9±0.25 PVCC=1.5V to 9V • Built-in 2 circuits of voltage driven BTL drivers 0.9±0.25 (0.4) 0.4±0.25 1.27 ■ Features • Operating supply voltage range ; VCC=3.5V to 9V 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 12.63±0.3 Unit : mm The AN8387S is an IC which incorporates 2 circuits of BTL drivers for driving various DC motors such as actuators (focus, tracking traverse), spindles, and loading of the CD players. 20-Lead SOP Package (SOP020-P-0300A) ■ Applications Linear driving of the DC motors and actuators of the CD players. CD radio cassette tape recorders, and so on. ■ Block Diagram 8 GND 9 4 3 2 7 a VREF SW 10kΩ + – VCC 1kΩ + – Thermal Shutdown Absolute Value Absolute Value Base Current Control Base Power Control 11 BTL 20 BTL b c P.GND 14 13 17 : Pin1, Pin10 a) VCC b) P.VCC : Pin12, Pin19 c) PGND : Pin5, Pin6, Pin15, Pin16 18 P.VCC ICs for CD/CD-ROM Player AN8387S ■ Absolute Maximum Ratings (Ta=25˚C) Symbol Rating Supply Voltage Parameter VCC 10 Unit Power Dissipation PD 1,200 Note) mW Operating Ambient Temperature Topr –30 ~ +85 ˚C Storage Temperature Tstg –55 ~ +125 ˚C V Note) When mounted onto the glass epoxy PCB (50mm × 50mm × 0.8mm) ■ Recommended Operating Range (Ta=25˚C) Parameter Operating Supply Voltage Range Symbol Range VCC 3.5V ~ 9V P.VCC 1.5V ~ 9V ■ Electrical Characteristics (Ta=25˚C) Parameter Symbol Current Consumption at No Input (VCC) IVCCQ VCC=9V, Vref=4.5V, PVCC=9V 1 2 3.5 mA Current Consumption at No Input (PVCC) IPVCCQ VCC=9V, Vref=4.5V, PVCC=9V 0.7 1.2 3.5 mA PVCC Leak Current IPVCCL VCC=0V, Vref=OPEN, PVCC=10V 1 µA Vref Threshold (H) Note 1) VrefH VCC=3V, PVCC=10V, VIN=0V Vref Threshold (L) Note 2) VrefL VCC=3V, PVCC=10V, VIN=0V RAIN 0.75 VI offset VCC=5V, Vref=2.5V, VIN=2.4→2.6V VCC=9V, Vref=4.5V, PVCC=9V VO offset VCC=9V, Vref=4.5V, PVCC=9V Input Amp. Input Impedance Driver Input Offset Voltage Note 3) Driver Output Offset Voltage Note 3) Note3) Condition min. typ. max. Unit 1.45 V 1 V 1 1.25 kΩ –10 0 10 mV –55 0 55 mV |VDZ| VCC=9V, Vref=4.5V, PVCC=9V –10 19 mV Driver Transfer Gain (+) Note3) G+ VCC=9V, Vref=4.5V, PVCC=9V 13 15.1 17 dB Driver (+), (–) Transfer Gain Ratio Note 3) RG VCC=9V, Vref=4.5V, PVCC=9V –1.9 – 0.9 0.5 dB Driver Output Voltage VOLG –130 130 mV Driver Output Voltage Absolute Value |VOL| 2.25 3 V Driver Power Transistor Saturation Voltage Vsat VCC=9V, Vref=4.5V, PVCC=9V, VLIM=0V VCC=9V, Vref=4.5V, PVCC=9V, VLIM=3V VCC=9V, Vref=4.5V, PVCC=9V, IO=300mA VCC=9V, Vref=2.5V, PVCC=5V, VIN=2.3V VCC=9V, Vref=2.5V, PVCC=5V, VIN=2.3V IO=300mA 0.38 V Driver Dead Zone Width PC Input Pin Threshold Voltage (H) Note 4) VPC THH PC Input Pin Threshold Voltage (L) Note 5) VPC THL Protective Diode Forward Voltage Thermal Protective Circuit Operating Temperature VPD TTHD 0.29 2.8 0.9 V 1.5 0.8 V 1.8 V 160 Note1) Vref voltage required to operate the driver. Note2) If Vref is made lower than this voltage, the driver dose not operate. Note3) Refer to the driver input/output characteristics chart. Note4) If the PC pin voltage is made higher than this voltage, there will be no output voltage from the driver. Both (+) and (–) outputs are pulling in the current. Note5) If the PC pin voltage is made lower than this voltage, the driver operates normally. ˚C ICs for CD/CD-ROM Player AN8387S ■ Application Circuit P VCC M 20 19 M 18 17 16 15 14 13 12 11 7 8 9 10 AN8387S 1 2 3 4 Error Signal1 5 6 VREF Error Signal2 VCC ■ Pin Descriptions Pin No. Symbol I/O DC Voltage Equivalent Circuit Description 1 1 10 VCC I VCC pin. Not connected to the PVCC pin. 4.8V 10 2 IN1 I Error signal input pin for the channel-1 driver 2.5V 2 – + 1kΩ or 9 9 IN2 I 4 2.5V Error signal input pin for the channel-2 driver Operational amplifier is of PNP differential input 3 PC1 I Input pin for the PC (inter-output voltage of the channel-1 driver OFF) 0V 3 1kΩ or 8 8 PC2 I 0V 100kΩ 50kΩ Input pin for the PC (inter-output voltage of the channel-2 driver OFF) ICs for CD/CD-ROM Player AN8387S ■ Pin Descriptions (Cont.) Pin No. 4 Symbol Vref I/O DC Voltage I 2.5V Description Equivalent Circuit 30kΩ 4 Vref input pin 40kΩ 5 5 6 15 16 6 P.GND O 0V PGND P.GND pin 15 16 7 GND O 0V 11 VLIM2 I VCC 7 GND pin VLIM pin for the channel-2 driver. Used when limiting the output voltage of the pins 13 and 14 VCC PVCC 11 VLIM pin for the channel-1 driver. Used when limiting the output voltage of the pins 17 and 18 or 20 VLIM1 I VCC 20 12 19 12 19 PVCC I Power VCC pin. Supplies the driver current. 3V PGND ×2 ICs for CD/CD-ROM Player AN8387S ■ Pin Descriptions (Cont.) Pin No. Symbol I/O DC Voltage Description Equivalent Circuit Non-inverting output pin for the channel-2 driver PVCC 13 D2+ O (2.7V) 14 D2– O (0.3V) Inverting output pin for the channel-2 driver 17 D1– O (0.3V) Inverting output pin for the channel-1 driver 13 14 or 18 D1+ or Non-inverting output pin for the channel-1 driver PGND 18 17 (2.7V) O ■ Supplementary Explanation • Operational Description The AN8387S incorporates the two channels of drivers. Since both channels have the identical functions, the following describes the channel-1 driver. • Block Diagram (Channel 1 driver) PVCC Error Amp. 19 IA Current Absolute Value Circuit – + Direction Decision VLIM IA IA 20 A Q1 + SW.A SW.B SW.C SW.B SW.A Vref S.W Q2 – R1 57.6 kΩ R2 57.6 kΩ SW. C 1kΩ Thermal Shutdown PC Q4 Q3 IA=0 SW.B SW.C 2 4 3 17 18 – + RIN 1 Vref (= 2 VCC) (RL=8.2Ω) An error signal (VIN) input to the pin2 is converted into the absolute value input current IA through the error amplifier and current absolute value circuit. The value of IA is as follows. ICs for CD/CD-ROM Player AN8387S IA = |VIN –Vref | RIN+1kΩ –V– | is limited within the following range. 2.25V ≤ |V+ –V– | ≤ 3V When the pin20 is short-circuited to GND, |V+ –V– | ≤ 130mV results regardless of an input error signal (VIN). If the pin20 is prepared to short-circuit to GND at power-on of the set, it can be used to prevent operation error at power-on of the motor or actuator. When the pin20 is not used, short-circuit it to the pins1 and 10. The pin3 is a PC pin. If a voltage of 2.8V or more is applied to this pin, SW.B and SW.C are turned on, IA becomes 0mA, and the base current flows to the bases of Q3 and Q4 simultaneously to turn on Q3 and Q4. As a result, the pins17 and 18 are almost short-circuited to P.GND. This IC incorporates the thermal shutdown circuit. If the chip temperature of the IC comes to about 160˚C, both drivers of the two channels are turned off. (the output pins17, 18, 14, and 13 are short-circuited to P.GND) Similarly, if the applied voltage (Vref) of the Vref pin4 comes to 1V or less, both drivers of the two channels are turned off. 1) When VIN>Vref, the direction determining circuit operates so that the following conditions are met. SW.A : + SW.B : ON SW.C : OFF 2) When VIN<Vref, the direction determining circuit operates so that the following conditions are met. SW.A : – SW.B : OFF SW.C : ON The output (V+–V–) between the pins18 and 17 has the following relation with the input (VIN –Vref) between the pins 2 and 4. 57.6kΩ (VIN –Vref) (V+ –V–) = RIN+1kΩ Therefore, the driver’s gain G will be as follows. (when the motor load RL is 8.2Ω) (V+ –V–) (VIN –Vref) G= 57.6kΩ 1kΩ + RIN = The output voltage V_ of the pin17 and V+ of the pin18 can be limited by applying a voltage to the VLIM pin20. For example, if a voltage of 3V is applied to the pin20 when VCC = 9V and RL = 8.2Ω, the maximum value of |V+ • Driver Input/Output Characteristics • Characteristics Curve Input Offset (VIOF) Output Offset (VOOF) Dead Zone (|VDZ|) Transfer Gain (+) (G+) (+), (–) Transfer Gain Ratio (RG) VCC = 9V P.VCC = 9V Vref = 4.5V PD –Ta Output B5 V1, V2 2000 G– 0.25V VOOF B3 4.5V 4.45V Input 4.55V 4.57V |VDZ| B1 1600 1400 1200 1000 800 600 400 200 B2 C– VIN Power Dissipation PD (mW) VIOF 4.43V When Mounted to PCB : Material. Glass Epoxy PCB. Size…5cm × 5cm × 0.8mm θj– a=83.3˚C/W 1800 B4 0 – 0.25V 0 20 40 60 80 100 Ambient Temperature Ta (˚C) G+ = B5–B4 B2–B1 G G– = RG = + 20mV , 20mV , G– 120 140