U6043B-MFPG3 Atmel, U6043B-MFPG3 Datasheet - Page 4

• Manufacturer Part Number: U6043B-MFPG3
• Description: IC FLASHER 18M OHM SHUNT 8-SOIC
• Manufacturer: Atmel
• Type: Automotive, Flasherr

Specifications of U6043B-MFPG3

• Current - Supply: 7mA
• Current - Output: 100µA
• Voltage - Supply: 9 V ~ 15 V
• Operating Temperature: -40°C ~ 95°C
• Package / Case: SO-8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency: -

4. Functional Description
4.1
4.2
4.3
4.4
4.5
4.6
4
Pin 1, GND
Pin 2, Supply Voltage, V
Pin 3, Relay Control Output (Driver)
Pin 4 and 5, Oscillator
Pin 6, Supply Voltage, Sense
Pin 7, Lamp Outage Detection
U6043B
The U6043B is protected against damage in case of battery reversal via resistor R
(–31). An integrated protection circuit together with external resistances R
rent pulses in the IC.
The arrangement of the supply connections to pin 2 (and 6) must be so as to ensure that on the
connection printed circuit board (PCB), the resistance of V
The relay control output is a high-side driver with a low saturation voltage. It is capable of driving
a typical automotive relay with a minimum coil resistance of 60 .
The flashing frequency, f
mula below (see
where C
In case of a lamp outage (see pin 7) the oscillator frequency is switched to the lamp outage fre-
quency f
Duty cycle in normal flashing mode: 50%
Duty cycle in lamp outage mode: 40% (bright phase)
For accurate monitoring via the shunt resistor, a minimized layer resistance from point V
to pin 6 is recommended.
The lamp current is monitored via an external shunt resistor R
with its reference voltage of typically 49 mV (V
according to the following calculation:
Nominal current of 1 lamp: 21W/(V
Nominal current of 2 lamps: 2
We recommend setting the detection threshold in the middle of the current range:
I
Thus, the shunt resistor is calculated as:
R
R
f
outage
1
sh
sh
= V
= 49 mV/2.7 A = 18 m
------------------------------------ - Hz
R
1
T
1
2
2.7A
(K1)/I
C
with f
1
1
47 µF, R
S
power
outage
1.5
2
Figure
2.2
1
= 6.8 k to 510 k
2-1):
1
, is determined by the R
f
1
.
21W/(V
S
= 12V): I
S
= 12V): I
lamp
S
= 1.75A
1
= 12V). The outage of one lamp is detected
lamp
C
1
components as given by the following for-
= 3.5A
S
to pin 6 is lower than that to pin 2.
sh
and an internal comparator K1
2
and R
4726C–AUTO–02/10
4
limits the cur-
4
to ground
S
/shunt