BA6780 datasheet(13/14 Pages) ROHM

13 / 14 page

BA6780 / BA6780FP-Y

Optical disc ICs

Operation notes

(1) The BA6780 and BA6780FP-Y have built in shutdown circuit that mute the output current when the chip temperature

reaches 175

°C (Typ.). The hysteresis is set to 25°C (Typ.), so the mute will be released when the chip temperature

falls to 150

°C (Typ.).

(2) The output current is muted when the supply (VCC) falls to 3V or less. When the mute is applied, the reverse driver is

set to to the VEE level, and governor driver is set to the VEE / 2 level.

(3) The VCC voltage level is the reference for the logic input pin input voltage, so when it is converted from the VEE

potential, the high level becomes (VCC+5) V, and the low level becomes (VCC) V. The voltage potential levels for the

pins are shown in the diagram below.

(4) Connect a bypass capacitor at the base of this IC for the power supply.

VDD

GND

(VCC

)

Vref pin input

voltage range

Control signal

input voltage range

Driver input voltage

range

VEE

Electrical characteristic curves

125

AMBIENT TEMPERATURE : Ta (˚C)

Fig.5 Thermal dissipation curve

100

1.31

1.45

150

175

DIP18package

HSOP-25

When mounted on ROHM

standard PCBS.

DIP18 Single

unit

−21

−5

−10

INPUT VOLTAGE : VIN

(V)

Fig.6 I / O characteristics with

governor connected

−2

−1

−32

−44

−4

−6

−8

∞

Ω

RL=

Ω

VCC=10V

(input form filter pin)

Filter

LOGIC

Internal

0.6

Ω

Vref

VCC+5V

VIN

2.0

−6

Vref INPUT VOLTAGE : Vrefin (V)

Fig.7 Reversible driver I / O characteristics

4.0

−4

−2

−8

−10

5.0

3.0

1.0

REVmode

RL=

Ω

∞

FWDmode

VCC=10V

External

Vref

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