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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
0.40.25
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 : 160C 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 10k +- 1k
0.2
(0.4)
5.50.3 7.60.3
0.90.25
+ 0.1 - 0.05
a
2.050.2 VCC 20 b P.VCC
*
11
BTL
0.10.1
BTL
c P.GND
14
13 : Pin1, Pin10 a) VCC b) P.VCC : Pin12, Pin19 c) PGND : Pin5, Pin6, Pin15, Pin16
17
18
0.90.25
* Built-in 2 circuits of voltage driven BTL drivers
1.27
s Features * Operating supply voltage range ; VCC=3.5V to 9V
12.630.3
AN8387S
s Absolute Maximum Ratings (Ta=25C)
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 x 50mm x 0.8mm)
s Recommended Operating Range (Ta=25C)
Parameter Operating Supply Voltage Range Symbol VCC P.VCC Range 3.5V ~ 9V 1.5V ~ 9V
s Electrical Characteristics (Ta=25C)
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=2.42.6V 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 A V V k 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 - +
Error signal input pin for the channel-1 driver
1k
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
1k
Input pin for the PC (inter-output voltage of the channel-1 driver OFF) 3
or
8 8 PC2 I 0V
100k
50k
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
30k
Vref input pin
40k
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
x2
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 k R2 57.6 k SW. C IA VLIM 20 Q1 Q2
IA
Vref S.W 1k 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=8.2)
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+1k 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 VINICs for CD/CD-ROM Player
-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 160C, 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.
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 = 8.2, the maximum value of |V+
* Driver Input/Output Characteristics
Input Offset (VIOF) Output Offset (VOOF) Dead Zone (|VDZ|) Transfer Gain (+) (G+) (+), (-) Transfer Gain Ratio (RG)
VCC = 9V P.VCC = 9V Vref = 4.5V
* Characteristics Curve
PD -Ta
Output V1, V2 0.25V B4 Power Dissipation PD (mW) VIOF B5 G- 2000 1800 1600 1400 1200 1000 800 600 400 200 0 - 0.25V 0 20 40 60 80 100 120 140 Ambient Temperature Ta (C)
When Mounted to PCB : Material. Glass Epoxy PCB. Size...5cm x 5cm x 0.8mm j- a=83.3C/W
4.43V
4.45V
VOOF B3 4.5V
Input 4.55V 4.57V VIN
|VDZ| B2 C- B1
G+ =
B5-B4 B2-B1 G G- = RG = + 20mV , 20mV , G-

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