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TDA7475A fiches techniques PDF

STMicroelectronics - ELECTRO-LUMINESCENT DISPLAY DRIVER

Numéro de référence TDA7475A
Description ELECTRO-LUMINESCENT DISPLAY DRIVER
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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TDA7475A fiche technique
® TDA7475A
ELECTRO-LUMINESCENT DISPLAY DRIVER
INTERNAL CLOCK GENERATION
STAND-BY FUNCTION
VOLTAGE SET-UP CONVERSION FUNC-
TION
ANTI-RADIATION TRAPEZOIDAL WAVE FOR
E.L. DISPLAY DRIVING
CONSTANT CURRENT CHARGE/DIS-
CHARGE OF E.L. DISPLAY
2-STEP BRIGHTNESS CONTROL (NORMAL
OR DIMMED LUMINANCE)
PROTECTIONS WITH AUTOMATIC RESET:
- COIL-SWITCHING MOS OVERCURRENT
- CHIP OVERTEMPERATURE
BCD OFF-LINE TECHNOLOGY
PowerSO16
ORDERING NUMBER: TDA7475A
DESCRIPTION
The TDA7475 is a new BCD OFF-LINE technol-
ogy device intended for EL display lighting in car-
radio applications. Time-extended luminance is
achieved by driving the display with constant-cur-
BLOCK DIAGRAM
rent pulses, which will automatically compensate
for the ageing-related capacitance loss by provid-
ing more elevated voltage pulses.
CCO
LSW
DSW
CCHG
VCC
16
VCCO
15
GATE
13
VDC VDC-sen
11 3
CURRENT
LIMITER
OVER THERMAL
PROTECTION
VCC
SENSE
ERR. AMP.
GATE
DRIVER
PWM COMP
QS
R
-
+
-
+
EL1
10
CEL
EL2
9
ICP
ICN
INTERNAL
VOLTAGE
SOURCE
OVER
VOLTAGE
PROTECTION
STAND-BY
1
TAB-GND
2
VSB
ISET-N
4
ISET-D
5
RN RD
14
P-GND
DIMMER
CONTROL
6
VDM
D98AU980
EL DRIVER CONTROL
7
CLKC
CCLK
f=8,4,2,1KHz
1/4 ~ 1/32
DIVIDER
f=32KHz
CLK OSC
8
CLKR
RCLK
November 2001
1/6

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