AN8787 Просмотр технического описания (PDF) - Panasonic Corporation

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AN8787

4-channel linear driver IC for CD/CD-ROM drive

Panasonic Corporation 

ICs for Compact Disc/CD-ROM Player

AN8787NSB

s Electrical Characteristics at SVCC = VCC1 = VCC2 = 12 V, VCC3 = 5 V, RL = 8 Ω, VPC = 5 V, VSTB = 5 V,

Ta = 25°C (continued)

Parameter

Symbol

Conditions

Min Typ Max Unit

Reset circuit

Reset operation release supply

voltage

VRST

 5

V

VREF detection voltage

VR

1.35  

V

• 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

PVC5 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:

RVC5

| 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.)

3. Power cut operation

RS3

RS4

S3 PVC3 PVC4 S4

PC

Standby

Low (open)

High

Low

High (open)

Ch. 1, Ch. 3, Ch. 4

Ch. 2

(exclusive for L0)

Mute

Active

Active

Mute

Standby

Active

or

Mute

4. Do not use ch. 2 (exclusive for loading) at more than 6 V of VCC2 when ch. 2 load is 20 Ω and less.

5. Appropriate care should be taken on the characteristics. When changing an external circuit constant on actual use,

secure an appropriate margin in consideration of characteristic fluctuation of external parts and our ICs including

transient characteristics as well as static ones.

6. Avoid the short-circuits between output pin and VCC , output pin and GND (line-to-supply and line-to-ground), and

between output pins (short-circuit due to load). Otherwise, the IC is likely to emit smoke and break down.

7. An appropriate prior study should be done for use of dip soldering.

5

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