ATMEL U2043B User Manual

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U2043B

Flasher, 30-m Shunt, Pilot Lamp to GND or V

Description

The integrated circuit U2043B is used in relay-controlled
automotive flashers where a high EMC level is required.
A lamp outage is indicated by frequency doubling during

Features

 Temperature and voltage compensated frequency
 Warning indication of lamp failure by means of

frequency doubling

 Minimum lamp load for flasher operation  10 W

Block Diagram

6

C

1

4

Measuring comparator

V6–81 mV

K

1

2

hazard mode as well as direction mode. The pilot lamp
can be connected either to V

Batt

 Relay output with high current carrying capacity and

low saturation voltage

 Low susceptibility to EMI

R

Shunt

7

Batt

or GND.

3

30 m

+ V

+ 49

S

3

Relay

R

8

1

2

3.3 k

R

1

100 

GND

– 31

5

13283

Pulse

generator

3.8 k 

K

V6–5 V

3

49 a–Comparator

23 V

IC Ground

Figure 1. Block diagram

R

1

Ordering Information

Extended Type Number Package Remarks

U2043B DIP8

U2043B–FP SO8

Pilot lamp 5 W

49 a

21 W 21 W 5 W21 W21 W5 W

Indicator lamps

Pilot lamps

Rev. A4, 02-Apr-01 1 (6)

U2043B

Pin Description

Pin Symbol Function

1 GND IC ground
2 V

Supply voltage V

S

S

3 REL Relay driver
4 OSC C1 oscillator
5 OSC R1 oscillator
6 V

Supply voltage V

S

S

7 LD Lamp failure detection
8 SI Start input (49a)

Functional Description

Pin 1, GND

The integrated circuit is protected against damage via
resistor R4 to ground (–31) in the case of battery reversal.
An integrated protection circuit together with external
resistances R2 and R

Pin 2, Supply voltage, V
The arrangement of the supply connections to Pin 2 must
be so as to ensure that, on the connection printed circuit
board (PCB), the resistance of VS to Pin 6 is lower than
that to Pin 2.

Pin 3, Relay control output (driver)
The relay control output is a high-side driver with a low
saturation voltage and capable to drive a typical automo­tive relay with a minimum coil resistance of 60 .

Pin 4 and 5 Oscillator
Flashing frequency, f1, is determined by the R1C1 compo­nents as follows (see figure 1):

f

where C1  47 F

R1  6.8 k to 510 k

In the case of a lamp outage (see Pin 7) the oscillator
frequency is switched to the lamp outage frequency f
with f2  2.2  f1.

Duty cycle in normal flashing mode: 50%
Duty cycle in lamp outage mode: 40% (bright phase)

Pin 6, Supply voltage, Sense
For accurate monitoring via the shunt resistor, a mini­mized layer resistance from point V
recommended.

limits the current pulses in the IC.

4

- Power

S



1

1

R1 C1 1.5

Hz

/ shunt to Pin 6 is

S

GND

Vs

1

2

8

SI

7

LD

U2043B

REL

OSC

Pin 7, Lamp outage detection
The lamp current is monitored via an external shunt
resistor R3 and an internal comparator K1 with its
reference voltage of typ. 81 mV (V
of one lamp out of two lamps is detected according to the
following calculation:
Nominal current of 1 lamp: 21 W / (V
I

= 1.75 A

lamp

Nominal current of 2 lamps: 2 x 21 W / (V
I

= 3.5 A.

lamp

The detection threshold is recommended to be set in the
middle of the current range: I
Thus the shunt resistor is calculated as:
R

= V

(K1) / I

3

T

R

= 81 mV/2.7 A = 30 m.

3

Comparator K1‘s reference voltage is matched to the
characteristics of filament lamps (see “control signal
threshold” in the data part).
The combination of shunt resistor and resistance of wire
harness prevents Pin 7 from a too high voltage in the case
of shorted lamps.

Pin 8, Start input
Start condition for flashing: the voltage at Pin 8 has to be
less than VS – 5 V (flasher switch closed).
Humidity and dirt may decrease the resistance between
49 a and GND. If this leakage resistance is  5 k the IC

2

is still kept in its off-condition. In this case the voltage at
Pin 8 is greater than VS – 5 V.
During the bright phase the voltage at Pin 8 is above the
K2 threshold, during the dark phase it is below the K3
threshold. For proper start conditions a minimum lamp
wattage of 10 W is required.

3

4

Figure 2. Pinning

outage

6

Vs

OSC

5

= 12 V). The outage

S

= 12 V):

S

 2.7 A

outage

= 12 V):

S

12749

Rev. A4, 02-Apr-012 (6)

Absolute Maximum Ratings

Reference point Pin 1

Parameters Symbol Value Unit
Supply voltage Pins 2, 6 V
Surge forward current

tp = 0.1 ms Pins 2, 6
tp = 2 ms Pins 2, 6
tp = 2 ms Pin 8

Output current Pin 3 I

Power dissipation

T

= 95°C DIP8

amb

T

= 60°C DIP8

amb

Junction temperature T
Ambient temperature range T
Storage temperature range T

SO8

SO8

I

FSM

I

FSM

I

FSM

P
P

P
P

S

O

tot
tot

tot
tot

amb

stg

U2043B

16.5 V

1.5

1.0
50

0.3 A

420
340

690
560

j

150 °C

–40 to +95 °C

–55 to +150 °C

A
A

mA

mW
mW

mW
mW

Thermal Resistance

Parameters Symbol Value Unit

Junction ambient DIP8

SO8

R
R

thJA
thJA

110
160

K/W
K/W

Electrical Characteristics

Typical values under normal operation in application circuit figure 1, VS (+49, Pins 2 and 6) = 12 V.
Reference point ground (–31), T

Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit
Supply voltage range Pins 2, 6 VS(+49) 9 to 15 V
Supply current Dark phase or

Supply current Bright phase Pins 2, 6 I
Relay output Saturation voltage

Relay output
reverse current

Relay coil resistance R
Start delay First bright phase t
Frequency determining

resistor
Frequency determining

capacitor

= 25°C, unless otherwise specified

amb

stand-by Pins 2, 6

IO = 150 mA,
VS = 9 V Pin 3

Pin 3 I

I

S

S

V

O

O

L

on

R

1

C

1

60 

6.8 510 k

4.5 8 mA

7.0 11 mA

1.0 V

0.1 mA

10 ms

47 F

Rev. A4, 02-Apr-01 3 (6)

U2043B

Electrical Characteristics (continued)

Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit

Frequency tolerance Normal flashing, basic fre-

quency f1 not including the
tolerance of the external

components R1 and C
Bright period Basic frequency f
Bright period Control frequency f
Frequency increase Lamp outage f
Control signal threshold VS = 15 V Pin 7

VS = 9 V

VS = 12 V
Leakage resistance 49a to GND R
Lamp load P

1

1

2

f

f
f

V
V
V

2

R3
R3
R3

L

1

1
2

p

–5 +5 %

47 53 %
37 45 %

2.15f
85

66
76

1

91
71
81

2.3 f
97

76
87

1

2 5 k

Hz

mV
mV
mV

10 W

Rev. A4, 02-Apr-014 (6)

Package Information

Package DIP8

Dimensions in mm

9.9 max

1.64

1.44

4.5

3.9

0.5 min

0.58

0.48

85

14

2.54

7.62

2.5

technical drawings
according to DIN
specifications

U2043B

7.82

7.42

6.4 max

0.39 max

9.75

8.15

13039

Package SO8

Dimensions in mm

5.00

4.85

1.4

0.4

1.27

3.81

85

14

0.25

0.10

5.2

4.8

3.7

3.8

6.15

5.85

technical drawings
according to DIN
specifications

0.2

13034

Rev. A4, 02-Apr-01 5 (6)

U2043B

Ozone Depleting Substances Policy Statement

It is the policy of Atmel Germany GmbH to

1. Meet all present and future national and international statutory requirements.

2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.

It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances (ODSs).

The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid
their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these
substances.

Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed
in the following documents.

1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively

2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency (EPA) in the USA

3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.

Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances
and do not contain such substances.

We reserve the right to make changes to improve technical design and may do so without further notice.

Parameters can vary in different applications. All operating parameters must be validated for each customer

application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended

or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims,

costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death

associated with such unintended or unauthorized use.

Data sheets can also be retrieved from the Internet: http://www.atmel–wm.com

Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany

Telephone: [phone], Fax number: 49 (0)7131 67 2423

Rev. A4, 02-Apr-016 (6)