Panasonic AN8353UB Datasheet

■ Overview

The AN8353UB is a dimmer IC to control illumination of the
car dashboard at high efficiency and high performance by pulse
width control. It outputs pulses at a duty proprotional to an
input voltage.

■ Features

•

Low power consumption by pulse control

•

External ON/OFF control by the standby pin

•

Pulse frequency range : 50Hz to 10kHz

•

Built-in overvoltage protective circuit approx. 20V

•

Wide operating ambient temperature range : –40˚C to+100˚C

•

All products temperature cycle, high reliability by normal
and high temperature checks reliability equivalent to the air
bags requested in U.S.

AN8353UB

High Efficiency Car Dashboard Dimmer IC

9
8
7
6
5
4
3
2

0.3

+0.1
– 0.05

23.3±0.3

6.0±0.3

2.4±0.25

3.3±0.25

1.5±0.25

0.5±0.1

2.54

1.5±0.25

1.4±0.3

30˚

3.0±0.3

Unit : mm

1

9-pin SIL Plastic Package (SIP009-P-0000C)

■ Block Diagram

3

Control
Voltage
Conversion

4

Over
Voltage
Protector

PWM
Comparator

Triangular
Wave Gen.

6 5 7 8

9

V

CC

1

GND

2

Pin No.

Pin name

■ Pin Descriptions

Description

1 Output pin

Outputs an intermittent source current at a duty proportional to an input voltage
2 GND GND
3 Input pin Applies a control voltage.
4

Noise eliminating capacity connection pin 1

Connect a capacitor to eliminator a noise.

7

Noise eliminating capacity connection pin 2

Connect a capacitor to eliminator a noise.

9 V

CC

Supply Voltage

5 Square wave output pin

6 Triangular wave output pin

8 Standby pin

Output a triangular wave, which serves as a reference for the PWM signal,

to the Pin6 by connecting the resistor R

T

between the Pins5 and6, and

capacity C

T

between the Pin6 and GND.

Output a triangular wave, which serves as a reference for the PWM signal,

to this pin by connecting the resistor R

T

between the Pins6 and 5, and

capasity C

T

between the Pin6 and GND.

Forces to shut off an output current if a voltage higher than a threshold

voltage of 1.1V is applied to the Pin8.

V

CC

P

D

T

opr

T

stg

Supply voltage
Power dissipation
Storage temperature
Operating ambient temperature

V

mW

˚C
˚C

Parameter Symbol Rating Unit

■ Absolute Maximum Ratings (Ta=25˚C)

22

550
–40 to +100
–50 to +150

Parameter Symbol Range

■ Recommended Operating Range (Ta=25˚C)

Operating supply voltage range

V

CC

8 to 18V

Parameter Symbol Condition min typ max

■ Electrical Characteristics (Ta=25˚C)

Supply current

I

CC

11 mA7.5

Eliminate C

T

and R

T

Oscillation frequency

f

osc

Hz115

C

T

=0.027µF

0% duty input voltage

V

IN – 0

3 V2.5

C

T

=0.027µF

100% duty input voltage

V

IN– 100

V

C

T

=0.027µF

Center duty (VCC=12V)

D

12V

%45

C

T

=0.027µF

%

C

T

=0.027µF

Center duty (VCC=8V)

DD

8V

%0

C

T

=0.027µF

10

Center duty (VCC=18V)

DD

18V

%50

C

T

=0.027µF

Output duty gain

D

G

V

Output voltage at ON

V

ON

µA0

C

T

=2100pF

Leakage current at OFF

I

L

V20

C

T

=2100pF

22

1.65

4

55

1.2

10.5

140

55

1
1

18

45

0.6

4

90

2

9.5
35
–1
–1

Over voltage detection voltage

V

OV

CT=2100pF

V1.1

CT=2100pF

Standby threshold voltage

V

STH

0

0.9

0.55

Unit