TDA7475A DISPLAY DRIVER Datasheet

TDA7475A Datasheet, PDF, Equivalent


Part Number

TDA7475A

Description

ELECTRO-LUMINESCENT DISPLAY DRIVER

Manufacture

STMicroelectronics

Total Page 6 Pages
Datasheet
Download TDA7475A Datasheet


TDA7475A
® 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

TDA7475A
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


Features ® TDA7475A ELECTRO-LUMINESCENT DISPLAY DRIVER INTERNAL CLOCK GENERATION STAN D-BY FUNCTION VOLTAGE SET-UP CONVERSION FUNCTION ANTI-RADIATION TRAPEZOIDAL WA VE FOR E.L. DISPLAY DRIVING CONSTANT CU RRENT CHARGE/DISCHARGE OF E.L. DISPLAY 2-STEP BRIGHTNESS CONTROL (NORMAL OR DI MMED LUMINANCE) PROTECTIONS WITH AUTOMA TIC RESET: - COIL-SWITCHING MOS OVERCUR RENT - CHIP OVERTEMPERATURE BCD OFF-LI NE TECHNOLOGY PowerSO16 ORDERING NUMBER : TDA7475A DESCRIPTION The TDA7475 is a new BCD OFF-LINE technology device in tended for EL display lighting in carra dio applications. Time-extended luminan ce is achieved by driving the display w ith constant-cur- BLOCK DIAGRAM rent p ulses, which will automatically compens ate for the ageing-related capacitance loss by providing more elevated voltage pulses. CCO LSW DSW CCHG VCC 16 VCCO 15 GATE 13 VDC VDC-sen 11 3 C URRENT LIMITER OVER THERMAL PROTECTION VCC SENSE ERR. AMP. GATE DRIVER PWM COMP QS R + + EL1 10 CEL EL2 9 ICP ICN INTERNAL VOLTAGE S.
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