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STMicroelectronics Electronic Components Datasheet

TDA7475A Datasheet

ELECTRO-LUMINESCENT DISPLAY DRIVER

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® 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


STMicroelectronics Electronic Components Datasheet

TDA7475A Datasheet

ELECTRO-LUMINESCENT DISPLAY DRIVER

No Preview Available !

TDA7475A
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC(DC)
VCC(pk)
VSB
VDM
VDC
Vo(min)
Topr
Tstg
Tj
Parameter
DC supply voltage
Peak supply voltage
Input voltage of VSB pin
Input voltage of VDM pin
Step up voltage
Minimum Output Voltage (pin 9, 10)
Operating temperature range
Storage temperature range
Junction temperature
PIN CONNECTION
Value
25
50
18
18
490
-0.2
-40 to +85
-55 to +150
160
Unit
V
V
V
V
V
V
°C
°C
°C
TAB-GND
VSB
VDC-sen
ISET-N
ISET-N
VDM
CLKC
CLKR
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
D98AU979
VCC
VCCD
PGND
GATE
N.C.
VDC
EL1
EL2
THERMAL DATA
Symbol
Rth(j-c)
Parameter
Thermal resistance Junction-case
Max.
Value
3
Unit
°C/W
2/6


Part Number TDA7475A
Description ELECTRO-LUMINESCENT DISPLAY DRIVER
Maker STMicroelectronics
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