AN8387

ICs for CD/CD-ROM Player AN8387S 2-channel Linear Driver s Overview 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. (0.4) 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 Unit : mm 0.4±0.25 PVCC=1.5V to 9V (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.) 20-Lead SOP Package (SOP020-P-0300A) s Applications Linear driving of the DC motors and actuators of the CD players. CD radio cassette tape recorders, and so on. s Block Diagram 8 9 4 3 2 GND 7 VREF SW +– Thermal Shutdown Absolute Value Base Current Control Base Power Control Absolute Value 10kΩ +– 1kΩ 0.2 (0.4) 5.5±0.3 7.6±0.3 0.9±0.25 + 0.1 – 0.05 a 11 BTL BTL 20 b c P.GND 14 13 : Pin1, Pin10 a) VCC b) P.VCC : Pin12, Pin19 c) PGND : Pin5, Pin6, Pin15, Pin16 17 18 2.05±0.2 VCC P.VCC • 0.1±0.1 0.9±0.25 • Built-in 2 circuits of voltage driven BTL drivers 1.27 s Features • Operating supply voltage range ; VCC=3.5V to 9V 12.63±0.3 AN8387S s Absolute Maximum Ratings (Ta=25˚C) Parameter Supply Voltage Power Dissipation Operating Ambient Temperature Storage Temperature Symbol VCC PD Topr Tstg ICs for CD/CD-ROM Player Rating 10 1,200 Note) –30 ~ +85 –55 ~ +125 Unit V mW ˚C ˚C Note) When mounted onto the glass epoxy PCB (50mm × 50mm × 0.8mm) s Recommended Operating Range (Ta=25˚C) Parameter Operating Supply Voltage Range Symbol VCC P.VCC Range 3.5V ~ 9V 1.5V ~ 9V s Electrical Characteristics (Ta=25˚C) Parameter Current Consumption at No Input (VCC) Current Consumption at No Input (PVCC) PVCC Leak Current Vref Threshold (H) Note 1) Vref Threshold (L) Note 2) Input Amp. Input Impedance Driver Input Offset Voltage Note 3) Driver Output Offset Voltage Driver Dead Zone Width Note3) Note 3) Symbol IVCCQ IPVCCQ IPVCCL VrefH VrefL RAIN VI offset VO offset |VDZ| G+ RG VOLG |VOL| Vsat VPC THH VPC THL VPD TTHD Condition VCC=9V, Vref=4.5V, PVCC=9V VCC=9V, Vref=4.5V, PVCC=9V VCC=0V, Vref=OPEN, PVCC=10V VCC=3V, PVCC=10V, VIN=0V VCC=3V, PVCC=10V, VIN=0V VCC=5V, Vref=2.5V, VIN=2.4→2.6V VCC=9V, Vref=4.5V, PVCC=9V VCC=9V, Vref=4.5V, PVCC=9V VCC=9V, Vref=4.5V, PVCC=9V VCC=9V, Vref=4.5V, PVCC=9V VCC=9V, Vref=4.5V, PVCC=9V 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 min. 1 0.7 1.45 typ. 2 1.2 max. 3.5 3.5 1 1 Unit mA mA µA V V kΩ mV mV mV dB dB mV V V V 0.75 –10 –55 –10 13 –1.9 –130 2.25 1 0 0 15.1 – 0.9 1.25 10 55 19 17 0.5 130 3 Driver Transfer Gain (+) Note3) Driver (+), (–) Transfer Gain Ratio Note 3) Driver Output Voltage Driver Output Voltage Absolute Value Driver Power Transistor Saturation Voltage PC Input Pin Threshold Voltage (H) Note 4) PC Input Pin Threshold Voltage (L) Note 5) Protective Diode Forward Voltage Thermal Protective Circuit Operating Temperature 0.29 2.8 0.38 0.8 0.9 1.5 160 1.8 V V ˚C 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. ICs for CD/CD-ROM Player s Application Circuit AN8387S P VCC M M 20 19 18 17 16 15 14 13 12 11 AN8387S 1 2 3 4 5 6 7 8 9 10 Error Signal1 VREF Error Signal2 VCC s Pin Descriptions Pin No. Symbol I/O DC Voltage Equivalent Circuit 1 1 10 VCC I 4.8V 10 VCC pin. Not connected to the PVCC pin. Description 2 IN1 I 2.5V 2 or 1kΩ – + Error signal input pin for the channel-1 driver 9 4 Error signal input pin for the channel-2 driver 9 IN2 I 2.5V Operational amplifier is of PNP differential input 3 PC1 I 0V 1kΩ Input pin for the PC (inter-output voltage of the channel-1 driver OFF) 3 or 8 8 PC2 I 0V 100kΩ 50kΩ Input pin for the PC (inter-output voltage of the channel-2 driver OFF) AN8387S s Pin Descriptions (Cont.) Pin No. Symbol I/O DC Voltage Equivalent Circuit ICs for CD/CD-ROM Player Description 4 Vref I 2.5V 4 30kΩ 40kΩ Vref input pin 5 5 6 15 16 6 P.GND O 0V 15 16 PGND P.GND pin 7 GND O 0V 7 GND pin VCC 11 VLIM2 I VCC PVCC VLIM pin for the channel-2 driver. Used when limiting the output voltage of the pins 13 and 14 11 or 20 VLIM1 I VCC 20 VLIM pin for the channel-1 driver. Used when limiting the output voltage of the pins 17 and 18 12 19 12 19 Power VCC pin. Supplies the driver current. PVCC I 3V PGND ×2 ICs for CD/CD-ROM Player s Pin Descriptions (Cont.) Pin No. Symbol I/O DC Voltage Equivalent Circuit AN8387S Description 13 D2+ O (2.7V) PVCC Non-inverting output pin for the channel-2 driver 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 or PGND 18 D1+ O (2.7V) 18 17 Non-inverting output pin for the channel-1 driver s 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 Current Absolute Value Circuit Direction Decision SW.A SW.B SW.C IA A + R1 57.6 kΩ R2 57.6 kΩ SW. C IA VLIM 20 Q1 Q2 IA Vref S.W 1kΩ Thermal Shutdown SW.A – SW.B PC IA=0 SW.B SW.C Q3 Q4 2 RIN 4 3 – 17 18 + 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. AN8387S IA = |VIN –Vref | RIN+1kΩ 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