BA9755S Datasheet, PDF (1/10 Pages) Rohm – High voltage controller for CRT displays

Multimedia ICs
High voltage controller for CRT
displays
BA9755S
The BA9755S is an LSI chip with a chopper voltage controller designed to control the anode voltage of multiscan
monitors and other CRTs. There are two internal high-precision power supplies, each with an output voltage preci-
sion of ±1%. Using a high-precision voltage detection resistor makes it possible to set anode voltage without adjust-
ment. Other internal components include an output voltage error detector and an overcurrent detector, which detects
overcurrent when the power is turned on.
•^Applications
CRT displays and HDTV products
•^Features
1) Internal chopper voltage controller.
2) Two internal high-precision power supplies, each
with an output voltage precision of ±1%.
3) Internal output voltage error detector.
4) Internal buffer circuit that directly drives power MOS-
FET for output drive.
•^{Absolute maximum ratings (Ta = 25°C)}
Parameter
Applied voltage 1
Applied voltage 2
Power dissipation
Symbol
Limits
Unit
VCC1
18^∗1
V
VCC2
20^∗2
V
Pd
600^∗1
mW
Operating temperature
Topr
– 25 ~ + 75
°C
Storage temperature
Tstg
– 55 ~ + 125
°C
∗ 1 18pin ∗ 2 3pin
∗ 3 Reduced by 6.0mW for each increase in Ta of 1°C over 25°C.
•^{Recommended operating voltage (Ta = 25°C)}
Parameter
Symbol
Limits
Unit
Applied voltage 1
VCC1
11 ~ 13
V
Applied voltage 2
VCC2
11 ~ 16
V
∗ Used with condition ^{VCC2 м VCC1}
1