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AN8783SB Datasheet, PDF (5/7 Pages) Panasonic Semiconductor – 4-channel linear driver IC for CD/CD-ROM drive
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ICs for Compact Disc/CD-ROM Player
AN8783SB
s Electrical Characteristics at SVCC = 12 V, VCC1 = 12 V, VCC2 = 5 V, RL = 8 Ω, VPC1 = 0 V, VPC2 = 5 V,
Ta = 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
temperature
TTHD
 160  °C
Thermal protection hysteresis
width
∆TTHD
 45  °C
Reset circuit
Voltage detection reset
hysteresis width
VHYS
 0.2 
V
s Usage Notes
1. SVCC 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.
To set gain for ch. 3 and ch. 4, use the following formula:
RVC2
| VIN3(4) −VREF |
R3(4) + 500 Ω
× 2.2 kΩ = RS3(4) × IOUT3(4)
(IOUT3 and IOUT4 are the load current for ch. 3 and ch. 4, respectively.)
RS3
RS4
S3 PVC3 PVC4 S4
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 charac-
teristic fluctuation of external parts and our ICs including transient characteristics as well as static ones.
5. Avoid the short-circuits between output pin and VCC , 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.
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