AN8819NFB Datasheet, PDF (10/11 Pages) Panasonic Semiconductor – 4Ch. Linear Driver IC DC-DC Converter Control for CD

AN8819NFB
ICs for CD/CD-ROM Player
s Characteristic Curve
2,000
1,800
1,786
1,600
PD –Ta
Glass epoxy board
(50mm × 50mm × 0.8mm)
Rthj– a = 70˚C/W
PD =1786mW (25˚C)
1,400
1,200
1,000
880
800
600
Unit
Rthj– a = 142˚C/W
400 _{PD = 880mW (25˚C)}
200
0
0
25 50 75 100 125 150
Ambient Temperature Ta (˚C)
s Description for use
• Driver Portion
Set the driver gain calculated by the equation shown below, except for SP driver. For SP driver, the gain must be set to the
calculated value + 6dB.
G
=
43kΩ
1.0kΩ +
R
R : External input resistance
The total channel driver supply is Pin33.
Set the driver supply as necessary, since the output amplitude increases with increase of the supply voltage. However, also
increase the voltage of DRVCC pin (Pin14) at the same time.
As protection functions, VREF detection and heat protection circuits are incorporated.
VREF detector sets the driver output to high impedance, when the voltage applied to VREF is 0.75V or less.
For the heat protective circuit, the set temperature for operation is approx. 150˚C and the release temperature is approx. 120˚C.
FO and TR drivers have the built-in function for making short-circuit between either loading end and GND by LDON (Pin18),
and for SP and TV drivers by PC (Pin20) and TRVSTOP (Pin22).
LDON : Output GND at L
PC
: Output GND at H
TRVSTOP : Output GND at H