U643B datasheet(3/5 Pages) ATMEL

3 / 5 page

U643B

Rev. A3, 10-Apr-01

3 (5)

Absolute Maximum Ratings

Reference point Pin 1

Parameters

Symbol

Value

Unit

Supply voltage

Pin 2 and 6

16.5

Surge forward current

tP = 0.1 ms

Pin 2 and 6

IFSM

1.5

tP = 0.1 ms

Pin 2 and 6

tP = 300 ms Pin 2 and 6

IFSM

1.5

1.0

tP = 300 ms Pin 2 and 6

tP = 300 ms Pin 8

IFSM

1.0

Output current

Pin 3

0.3

Power dissipation

Tamb = 95°C

DIP 8

SO 8

Ptot

420

340

SO 8

Tamb = 60°C

DIP 8

SO 8

Ptot

340

690

560

Junction temperature

150

°C

Ambient temperature range

Tamb

–40 ... + 95

°C

Storage temperature range

Tstg

–55 ... + 150

°C

Thermal Resistance

Parameters

Symbol

Value

Unit

Junction ambient

DIP8

SO8

RthJA

110

160

K/W

Electrical Characteristics

Typical values under normal operation in application circuit (see figure 1), VS (+49, Pin 2 and 6) = 12 V.

Reference point ground (–31), Tamb = 25°C, unless otherwise specified

Parameters

Test Conditions / Pins

Symbol

Min.

Typ.

Max.

Unit

Supply voltage range

Pin 2 and 6

VS (+49)

9 to 15

Supply current:

Pin 2 and 6

Dark phase

Bright phase

4.5

7.0

Relay output:

saturation voltage

Pin 3

IO = 150 mA, VS= 9 V

saturation voltage

reverse current

150 mA, VS 9 V

with resistance = 60

1.0

0.1

Start delay

First bright phase

ton

Frequency tolerance

df1

–5

Bright period

Basic frequency f1

Control frequency f2

∆f1

∆f2

Frequency increase

Lamp outage

2.15 f1

2.3 f1

Control signal threshold

VS = 15 V

Pin 7

VS = 9 V

Pin 7

VS = 12 V

Pin 7

VR3

Leakage resistance

49a to GND

Lamp load

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