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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.
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Applications
CRT displays and HDTV products
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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.
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Absolute maximum ratings (Ta = 25°C)
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Recommended operating voltage (Ta = 25°C)
Parameter Symbol Limits Unit
Applied voltage 1 VCC118
* 1
V
Applied voltage 2 VCC220
* 2
V
Power dissipation Pd 600
* 1
mW
Operating temperature
Topr – 25 ~ + 75 °C
Storage temperature Tstg – 55 ~ + 125 °C
*
3 Reduced by 6.0mW for each increase in Ta of 1°C over 25°C.
*
1 18pin
*
2 3pin
Parameter Symbol Limits Unit
Applied voltage 1 VCC111 ~ 13 V
Applied voltage 2 VCC21 ~ 16 V
*
Used with condition VCC2 ^ VCC1