U6043B_05 [ATMEL]
Flasher IC with 18-mOHM Shunt; 闪光器IC，具有18毫欧分流
| 型号： | U6043B_05 |
| 厂家： | 
ATMEL |
| 描述： | Flasher IC with 18-mOHM Shunt |
| 文件： | 总8页 (文件大小：248K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
• Temperature and Supply Voltage Compensated Flashing Frequency
• Frequency Doubling Indicates Lamp Outage
• Relay Driver Output with High Current Carrying Capacity and Low Saturation Voltage
• Minimum Lamp Load for Flasher Operation: ≥ 1 W
• Very Low Susceptibility to EMI
• Protection According to ISO/TR 7637/1 Level 4
Flasher IC with
18-mΩ Shunt
U6043B
1. Description
The bipolar integrated circuit U6043B is used in relay-controlled automotive flashers
where a high level EMC is required.
Lamp outage is indicated by frequency doubling during hazard warning as well as
direction mode.
Rev. 4726B–AUTO–11/05
2. Block Diagram
Figure 2-1. Car Flasher Application Circuit
+ V S
+ 49
6
2
R3
C1
Measuring comparator
18 mΩ
Shunt
V6 - 49 mV
20 kΩ
4
5 kΩ
K1
7
K2
3
8
Pulse
generator
R1
49 a-Comparator K 2
Relay
R2
20 kΩ
49 a-Comparator K 3
49 a
K3
1.5...2.2 kΩ
5
23 V
5 kΩ
20 kΩ
IC Ground
1
R4
5 W 21 W 21 W
21 W 21 W 5 W
470 Ω
Indicator lamps
GND
- 31
2
U6043B
4726B–AUTO–11/05
U6043B
3. Pin Configuration
Figure 3-1. Pinning
1
2
3
4
8
7
SI
GND
VS
LD
U6043B
REL
OSC
6
5
VS
OSC
Table 3-1.
Pin Description
Pin
1
Symbol
GND
VS
Function
IC ground
2
Supply voltage
Relay driver
Oscillator
3
REL
OSC
OSC
VS
4
5
Oscillator
6
Supply voltage, Sense
Lamp outage detection
Start input (49a)
7
LD
8
SI
4. Functional Description
4.1
Pin 1, GND
The U6043B is protected against damage in case of battery reversal via resistor R4 to ground
(-31). An integrated protection circuit together with external resistances R2 and R4 limits the cur-
rent pulses in the IC.
4.2
4.3
Pin 2, Supply Voltage, VS power
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 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. It is capable of driving
a typical automotive relay with a minimum coil resistance of 60 Ω.
3
4726B–AUTO–11/05
4.4
Pin 4 and 5, Oscillator
The flashing frequency, f1, is determined by the R1C1 components as given by the following for-
mula below (see Figure 2-1):
1
------------------------------------
≈
Hz
1
R1 × C1 × 1,5
where C1 ≤47 µF, R1 = 6.8 kΩ to 510 kΩ
In case of a lamp outage (see Pin 7) the oscillator frequency is switched to the lamp outage fre-
quency f2 with f2 ≈ 2.2 × f1.
Duty cycle in normal flashing mode: 50%
Duty cycle in lamp outage mode: 40% (bright phase)
4.5
4.6
Pin 6, Supply Voltage, Sense
For accurate monitoring via the shunt resistor, a minimized layer resistance from point VS/shunt
to Pin 6 is recommended.
Pin 7, Lamp Outage Detection
The lamp current is monitored via an external shunt resistor Rsh and an internal comparator K1
with its reference voltage of typically 49 mV (VS = 12 V). The outage of one lamp is detected
according to the following calculation:
Nominal current of 1 lamp: 21 W/(VS = 12 V): Ilamp = 1.75 A
Nominal current of 2 lamps: 2 × 21 W/(VS = 12 V): Ilamp = 3.5 A
We recommend setting the detection threshold in the middle of the current range:
I
outage ≈ 2.7 A
Thus, the shunt resistor is calculated as:
sh = VT (K1)/Ioutage
R
Rsh = 49 mV/2.7 A = 18 mΩ
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 case of shorted lamps.
4.7
Pin 8, Start Input
Start condition for flashing: the voltage at Pin 8 has to be below the K3 threshold (flasher switch
closed).
Humidity and dirt may decrease the resistance between 49 a and GND. If this leakage resis-
tance is > 5 kΩ, the IC is still kept in the off-condition. In this case the voltage at Pin 8 is between
the thresholds of comparators K2 and K3.
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 1 W is required.
4
U6043B
4726B–AUTO–11/05
U6043B
5. Absolute Maximum Ratings
Reference point Pin 1
Parameters
Symbol
Value
Unit
Supply voltage
Pin 2 and 6
VS
16.5
V
Surge Forward Current
Pin 2 and 6
Pin 2 and 6
tP = 0.1 ms
tP = 300 ms
tP = 300 ms
IFSM
IFSM
IFSM
1.5
1.0
50
A
A
mA
Pin 8
Pin 3
Output current
Power Dissipation
Tamb = 95°C
IO
0.3
A
DIP8
SO8
DIP8
SO8
Ptot
Ptot
Ptot
Ptot
420
340
690
560
mW
mW
mW
mW
Tamb = 60°C
Junction temperature
TJ
150
°C
°C
°C
Ambient temperature range
Storage temperature range
Tamb
Tstg
-40 to +95
-55 to +150
6. Thermal Resistance
Parameters
Symbol
Value
Unit
DIP8
RthJA
RthJA
110
160
K/W
K/W
Junction ambient
SO8
7. Electrical Characteristics
Typical values under normal operation in application circuit (see Figure 2-1), VS (+49, Pin 2 and 6) = 12 V.
Reference point ground (-31), Tamb = 25°C, unless otherwise specified.
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Supply voltage range
Pin 2 and 6
VS
9
15
V
Dark phase, Pin 2 and 6
Bright phase, Pin 2 and 6
IS
IS
4.5
7.0
8
11
mA
mA
Supply current
Relay control output:
Saturation voltage
Reverse current
Pin 3
IO = 150 mA, VS= 9 V
VO
IO
1.0
0.1
V
mA
Start delay (Delay time)
Frequency tolerance
First bright phase
Normal flashing
ton
10
+5
ms
%
∆f1
-5
Basic frequency f1
Control frequency f2
∆f1
∆f2
47
37
53
45
%
%
Bright period
Frequency increase
Lamp outage
f2
2.15 × f1
2.3 × f1
Hz
VS = 15 V, Pin 7
VS = 9 V, Pin 7
VS = 12 V, Pin 7
VRs
VRs
VRs
50
43
47
53
45
49
57
47
51
mV
mV
mV
Control signal threshold
Leakage resistance
Lamp load
49a to GND
RP
PL
4
5
kΩ
1
W
5
4726B–AUTO–11/05
8. Ordering Information
Extended Type Number
Package
DIP8
Remarks
U6043B-MY
Pb-free
U6043B-MFPY
SO8
Tubed, Pb-free
Taped and reeled, Pb-free
U6043B-MFPG3Y
SO8
9. Package Information
6
U6043B
4726B–AUTO–11/05
U6043B
Package SO8
Dimensions in mm
5.2
4.8
5.00
4.85
3.7
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
10. 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
• First page: Pb-free logo added
• Page 6: Ordering Information changed
4726B-AUTO-11/05
7
4726B–AUTO–11/05
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4726B–AUTO–11/05
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