U2043B-MFPY [ATMEL]
Flasher, 30 mOHM Shunt, Pilot Lamp to GND or VBatt; 闪光器， 30毫欧分流器，指示灯到GND或VBATT
| 型号： | U2043B-MFPY |
| 厂家： | 
ATMEL |
| 描述： | Flasher, 30 mOHM Shunt, Pilot Lamp to GND or VBatt |
| 文件： | 总10页 (文件大小：201K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
•
•
•
•
Temperature and Voltage Compensated Frequency
Warning Indication of Lamp Failure by Means of Frequency Doubling
Minimum Lamp Load for Flasher Operation ≥ 10W
Relay Output with High Current Carrying Capacity and Low Saturation
Voltage
•
Low Susceptibility to EMI
Flasher, 30 mΩ
Shunt, Pilot
Lamp to GND or
VBatt
1. 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
hazard mode as well as direction mode. The pilot lamp can be connected either to
U2043B
V
Batt or GND.
Figure 1-1. Block Diagram
+ V S
+ 49
6
2
R3
C1
30 m Ω
Shunt
Measuring comparator
4
V 6-81 mV
K1
7
Pilot lamp
5 W
3
8
Pulse
generator
R1
Relay
R2
3.8 k Ω
49 a
K3
3.3 k Ω
V6-5 V
5
23 V
49 a-Comparator
R1
1
IC Ground
5 W 21 W 21 W
21 W 21 W 5 W
100 Ω
Indicator lamps
Pilot lamps
GND
- 31
Rev. 4720B–AUTO–09/05
2. Pin Configuration
Figure 2-1. Pinning DIP8/SO8
1
2
3
4
8
7
6
5
SI
GND
VS
LD
U2043B
REL
VS
OSC
OSC
Table 2-1.
Pin Description
Pin
1
Symbol
GND
VS
Function
IC ground
2
Supply voltage VS
Relay driver
3
REL
OSC
OSC
VS
4
C1 Oscillator
5
R1 Oscillator
6
Supply voltage VS
Lamp failure detection
Start input (49a)
7
LD
8
SI
2
U2043B
4720B–AUTO–09/05
U2043B
3. Functional Description
3.1
GND (Pin 1)
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 R4
limits the current pulses in the IC.
3.2
3.3
3.4
Supply Voltage, VS Power (Pin 2)
The arrangement of the supply connections to pin 2 must be so as to ensure that, on the con-
nection printed circuit board (PCB), the resistance of VS to pin 6 is lower than that to pin 2.
Relay Control Output (Driver, Pin 3)
The relay control output is a high-side driver with a low saturation voltage and capable of driving
a typical automotive relay with a minimum coil resistance of 60Ω.
Oscillator (Pin 4 and 5)
Flashing frequency, f1, is determined by the R1C1 components as follows (see Figure 1-1 on
page 1):
1
------------------------------------
1
f
=
Hz
1
R × C × 1.5
1
where
C1 ≤ 47 µF
R1 = 6.8 kΩ to 510 kΩ
In the case of a lamp outage (see pin 7) the oscillator frequency is switched to the lamp outage
frequency f2 with f2 ≈ 2.2 × f1.
Duty cycle in normal flashing mode:
Duty cycle in lamp outage mode:
50%
40% (bright phase)
3.5
Supply Voltage, Sense (Pin 6)
For accurate monitoring via the shunt resistor, a minimized layer resistance from point VS/shunt
to pin 6 is recommended.
3
4720B–AUTO–09/05
3.6
Lamp Outage Detection (Pin 7)
The lamp current is monitored via an external shunt resistor R3 and an internal comparator K1
with its reference voltage of typically 81 mV (VS = 12V). The outage of one lamp out of two
lamps is detected according to the following calculation:
Nominal current of 1 lamp:
Nominal current of 2 lamps: 2 × 21W/(VS = 12V):
We recommend setting the detection threshold in the middle of the current range:
outage ≈ 2.7A
21W/(VS = 12V):
Ilamp = 1.75A
Ilamp = 3.5A
I
Thus, the shunt resistor is calculated as:
R3 = VT (K1)/Ioutage
R3 = 81 mV/2.7 A = 30 mΩ
Comparator K1’s reference voltage is matched to the characteristics of filament lamps (see sec-
tion “Control Signal Threshold”).
The combination of the shunt resistor and the resistance of the wire harness prevents pin 7 from
a too high voltage in the case of shorted lamps.
3.7
Start Input (Pin 8)
Start condition for flashing:
The voltage at pin 8 has to be less than VS – 5V (flasher switch closed).
Humidity and dirt may decrease the resistance between 49a and GND. If this leakage resistance
is > 5 kΩ the IC is still kept in its off-condition. In this case the voltage at pin 8 is greater than
VS – 5V.
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 10W is required.
4
U2043B
4720B–AUTO–09/05
U2043B
4. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Reference point: pin 1
Parameters
Symbol
Value
Unit
Supply voltage, pins 2 and pin 6
VS
16.5
V
Surge forward current
tp = 0.1 ms
tp = 2 ms
IFSM
IFSM
IFSM
1.5
1.0
50
A
A
mA
tp = 2 ms
Output current, pin 3
Power Dissipation
IO
0.3
A
Tamb = 95°C, DIP8
SO8
Ptot
Ptot
420
340
mW
mW
Tamb = 60°C, DIP8
SO8
Ptot
Ptot
690
560
mW
mW
Junction temperature
Tj
150
°C
°C
°C
Ambient temperature range
Storage temperature range
Tamb
Tstg
–40 to +95
–55 to +150
5. Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient, DIP8
Junction ambient, SO8
RthJA
RthJA
110
160
K/W
K/W
5
4720B–AUTO–09/05
6. Electrical Characteristics
Typical values under normal operation in application circuit Figure 1-1 on page 1, VS (+49, pin 2 and pin 6) = 12V.
Reference point ground (–31), Tamb = 25°C, unless otherwise specified
Parameters
Test Conditions
Symbol
Min.
Typ.
9 to 15
4.5
Max.
Unit
V
Supply voltage range
Supply current
Supply current
Pins 2, 6
VS(+49)
Dark phase or stand-by, pins 2, 6
Bright phase, pins 2, 6
IS
IS
8
mA
mA
7.0
11
Saturation voltage
IO = 150 mA,
VS = 9V (pin 3)
Relay output
VO
1.0
0.1
V
Relay output reverse current
Relay coil resistance
Pin 3
IO
mA
Ω
RL
ton
R1
C1
60
Start delay
First bright phase
10
510
47
ms
kΩ
µF
Frequency determining resistor
Frequency determining capacitor
6.8
Normal flashing, basic frequency f1 not
including the tolerance of the external
components R1 and C1
Frequency tolerance
∆f1
–5
+5
%
Basic frequency f1
Control frequency f2
Lamp outage
∆f1
∆f2
f2
47
37
53
45
%
%
Bright period
Frequency increase
2.15 × f1
2.3 × f1
Hz
VS = 15V (pin 7)
VS = 9V
VS = 12V
VR3
VR3
VR3
85
66
76
91
71
81
97
76
87
mV
mV
mV
Control signal threshold
Leakage resistance
Lamp load
49a to GND
Rp
PL
2
5
kΩ
10
W
6
U2043B
4720B–AUTO–09/05
U2043B
7. Ordering Information
Extended Type Number
Package
DIP8
Remarks
U2043B-MY
Tubed, Pb-free
U2043B-MFPY
SO8
Tubed, Pb-free
U2043B-MFPG3Y
SO8
Taped and reeled, Pb-free
8. Package Information
Package SO8
Dimensions in mm
5.2
4.8
5.00
3.7
4.85
1.4
0.25
0.2
0.4
3.8
0.10
1.27
6.15
5.85
3.81
8
5
technical drawings
according to DIN
specifications
1
4
7
4720B–AUTO–09/05
Package: DIP8
Dimensions in mm
9.8 max.
9.6±0.1
7.62±0.15
0.3 B
A
1.2±0.3
0.53±0.05
6.3±0.1
0.4 A
2.54 nom.
8.75±0.8
3 x 2.54 = 7.62 nom.
B
1.54
0.65
5
8
1
technical drawings
according to DIN
specifications
4
Drawing-No.: 6.543-5040.01-4
Issue: 1; 16.01.02
8
U2043B
4720B–AUTO–09/05
U2043B
9. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision
mentioned, not to this document.
Revision No.
History
• Put datasheet in a new template
• Pb-free logo on page 1 added
4720B-AUTO-09/05
• New heading rows in Table “Absolute Maximum Rating” on page 5 added
• Ordering Information on page 7 changed
9
4720B–AUTO–09/05
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4720B–AUTO–09/05
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