BA6997 Rohm, BA6997 Datasheet - Page 6

• Manufacturer Part Number: BA6997
• Description: 4-channel BTL driver for CD players
• Manufacturer: Rohm

FOperation notes
(1)
thermal shutdown circuit. Output current is muted when
the chip temperature exceeds 175_C (typically).
(2)
mute pin (pin 9) voltage or lowering it below 0.5V. This pin
should be pulled up above 2.0V during normal operation.
When muting occurs, the output pins output the internal
bias voltage, roughly V
(3)
ulator switch (pin 10) or lowering it below 0.5V. This pin
should be pulled up above 2.0V during normal operation.
(4)
drops below 1.4V (typically). This pin should stay above
1.6V during normal operation.
(5)
power supply, at the base of the IC.
(6)
ground.
FElectrical characteristic curves
408
Optical disc ICs
The BA6997FP and BA6997FM have an internal
The output current can be muted by opening the
The regulator can be turned off by opening the reg-
Muting also occurs when the bias pin (8 pin) voltage
Attach a bypass capacitor (roughly 0.1 F) to the
Be sure to connect the radiating fin to an external
CC
/ 2.
(7)
REGGND (pin 7) also serves to prevent oscillation of the
IC, so select one with good temperature characteristics.
(8)
attach to the regulator.
(9)
is shown in the diagram below. Note that the internal ref-
erence voltage is also used for the 5V regulator, which
will cease to operate normally when the temperature
monitor pin emits a current exceeding the regulator’s ca-
pacity. Set I to several dozen A.
The capacitor between regulator output (pin 6) and
We recommend 2SB1132 as the PNP transistor to
The internal circuitry of the temperature monitor pin
BA6997FP/BA6997FM