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PDF BA6998FP Data sheet ( Hoja de datos )

Número de pieza BA6998FP
Descripción 4-channel BTL driver
Fabricantes ROHM Semiconductor 
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No Preview Available ! BA6998FP Hoja de datos, Descripción, Manual

Optical disc ICs
4-channel BTL driver for CD
BA6998FP
BA6998FP
The BA6998FP ICs contain a 4-channel BTL driver, 5V regulator (which requires an externally connected PNP transistor),
multi-purpose operational amplifier, and reset output for use with CD players. Also equipped with an input pin for gain
adjustment for all channels of the driver block so that the gain can be adjusted to the desired value for your application.
Furthermore, a built-in level shift circuit exists to further reduce the amount of external components required.
zFeatures
1) 4ch Driver for BTL.
2) Small surface mounting power package (HSOP 28pin).
3) Adjustable gain by the external resistors.
4) Incorporates a thermal shut down circuit.
5) Incorporates a voltage regulator (5V) (PNP Tr is needed outside).
6) Incorporates an operational amplifier.
7) Incorporates a reset-output terminal.
zApplications
CD players, CD-ROM, and other optical disc equipment
zAbsolute maximum ratings (Ta=25°C)
Parameter
Symbol
Limits
Unit
Supply voltage
VCC 13.5
V
Power dissipation
PD 1.7
W
Operating temperature
Topr 35 to +85
°C
Storage temperature
Tstg 55 to +150
°C
Derating is done at 13.6mW/°C for operation above Ta=25°C.
On less than 3% (percentage occupied by copper foil), 70 x 70mm2 , t =1.6mm, glass epoxy mounting.
zRecommended operating conditions (Ta=25°C)
Parameter
Symbol
Limits
Supply voltage
VCC 6 to 9
The driver blocks operate on condition that supply voltage is over 5.5V.
Unit
V
1/6

1 page




BA6998FP pdf
Optical disc ICs
BA6998FP
zOperation notes
(1) Relation between mute and reset.
Functions
MUTE
RESET
Regulator drop ON 'H' to 'L'
Bias drop
ON 'H' to 'L'
Thermal shut down
ON
'H' to L'
Mute (Pin.15)
ON constant
Regulator drop In case regulator voltage below 4.0V(Typ.), output current is muted and reset output is 'L'.
Bias drop
Next time regulator voltage rises to 4.2V(Typ.), output current is active and reset output is 'H'.
In case bias-pin (Pin.23) voltage falls below 0.7V(Typ.), output current is muted and reset output is
T.S.D.
'L'. Make sure that under normal operating conditions, this pin is at 1.2V or above.
In case IC chip temperature rise to 175°C (Typ.), thermal shut down circuit operates and output
current is muted and reset output is 'L'.
Next time IC chip temperature falls bellow 150°C (Typ.),the driver blocks start..
Mute (Pin.7) In case mute-pin (Pin.7) voltage is under 0.5V or opened, output current is muted.
(2) The output current is muted in the event of a T.S.D., mute-on, a bias voltage drop, or a regulator voltage drop.
Only the drivers are muted. When muted, the internal bias voltage of the output pin becomes roughly (VCC-VF/2).
(3) Insert the by-pass capacitor between VCC and GND as possible as near (about 0.1µF).
(4) The capacitor between regulator output (Pin.6) and GND combines with prevention of oscillation. The capacitor with
small temperature coefficient should be recommendable.
(5) When it is not to use regulator, output of regulator (Pin.6) is connected with VCC and base terminal of PNP(Pin.5) is
opened.
(6) Fin should be connected to outside ground.
(7) Please lay out pattern with care, as Pin.8 GND electric potential is not below SUBGND electric potential include
transitional condition.Because only Pin.8 GND of three GND do not connect with IC's substrate.
zElectrical characteristics curves
2
Glass epoxy mounting
(70mm×70mm,t=1.6mm)
on less than 3%(ocupied by copper foil)
1.5
1
0.5
0
0 25 50 75 100 125 150 175
AMBIENT TEMPERATURE : Ta(°C)
Fig.2 Thermal dissipation curve
RL=
5
20
12
8
4
Vcc=8V
3
2
1
-4 -3 -2 -1
01 2 3 4
-1
-2
-3
-4
-5
INPUT VOLTAGE : VIN(V)
Fig.3 Driver input/output characteristics
(When load changed)
Vcc=
9V
5
8V
4
7V
3 6V
5V
2
RL=8
1
-4 -3 -2 -1
01 2 3 4
-1
-2
-3
-4
-5
INPUT VOLTAGE : VIN(V)
Fig.4 Driver input/output characteristics
(When supply voltage changed)
5/6

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