U2044B-MY [ATMEL]
Dual Output Flasher; 双路输出闪光
| 型号： | U2044B-MY |
| 厂家： | 
ATMEL |
| 描述： | Dual Output Flasher |
| 文件： | 总9页 (文件大小：227K) |
| 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
Two Relay Driver Outputs with High Current-carrying Capacity and Low Saturation
Voltage
•
•
•
•
•
•
Minimum Lamp Load for Flasher Operation: ≥ 1W
Very Low Susceptibility to EMI
Dual Output
Flasher
Protection According to ISO/TR7637/1 Level 4
Extremely Low Current Consumption < 10 µA (with Switches Open)
Reverse Polarity Protection
Three Control Inputs: Left, Right and Hazard Warning
U2044B
1. Description
The integrated circuit U2044B is used in relay-controlled automotive flashers. With
two output stages, each side of the vehicle is controlled separately. A left and a right
direction indicator input with only a small control current makes switch contacts for
small loads possible.
The separate hazard warning input simplifies the construction of the hazard switch.
Lamp outage is indicated by frequency doubling during direction mode. Thanks to
extreme low current consumption the U2044B can be directly connected to the
battery.
Rev. 4721B–AUTO–09/05
Figure 1-1. Block Diagram
30
30
9
5
RShunt
30 m
VS-81 mV
+
-
Ω
C1
8
4.7 µF
K1
Contact
1
2
+
-
14
R1
R9
82 kΩ
6
7
VRef1
47 kΩ
+
-
1
R8
+
-
47 kΩ
-
+
VS /2
VRef2
-
+
VS-6 V
27.5 V
12
30
11
13
GND 10
3
2
4
R2
R3
4.7 kΩ
R10
1.2 k
220Ω
Ω
Hazard warning
R4
R6
Relay
1
Ω
4.7 k
4.7 kΩ
2
right
left
15
31
R5
R7
1.2 kΩ
1.2 k
Ω
12700
2
U2044B
4721B–AUTO–09/05
U2044B
2. Pin Configuration
Figure 2-1. Pinning DIP14/SO14
OSC 1
14 OSC
SIL
2
3
4
5
6
7
13
12
OR2
VS
SIR
11
10
SIHW
VS
OR1
GND
VS
U2044B
9
8
CR1
CR2
LD
Table 2-1.
Pin Description
Pin
1
Symbol
OSC
SIL
Function
Oscillator
2
Start input left
Start input right
3
SIR
4
SIHW
VS
Start input hazard warning
VS
5
6
CR1
CR2
LD
Control input relay 1
Control input relay 2
Lamp failure detection
VS
7
8
9
VS
10
11
12
13
14
GND
OR1
VS
IC ground
Output relay 1
VS
OR2
OSC
Output relay 2
Oscillator
3
4721B–AUTO–09/05
3. Functional Description
3.1
Oscillator (Pin 1 and 14)
Flashing frequency, f1, is determined by the R1C1 components as follows (see Figure 1-1 on
page 2):
1
------------------------------------
1
f ≈
Hz
1
R × C × 1.5
1
where
C1 ≤ 47 µF
R1 = 6.8 kΩ to 180 kΩ
In the case of a lamp outage, the oscillator frequency is switched to the lamp outage frequency
f2 with f2 ≈ 2.2 × f1.
Duty cycle in normal flashing mode: 50%
Duty cycle in lamp outage mode:
40% (bright phase)
3.2
Start Input Right and Left (Pin 2 and 3)
Flashing is disabled as long as the input comparator is tied to GND (pull-down resistor R7 or R5).
The high-side flasher switch left or right changes the comparator status and enables the output
stage at pin 11 or pin 13. R6 and R4 are protection resistors for the input stage.
With an open flasher switch the current consumption is only I < 10 µA. The IC is kept in stand-by
mode until there is a voltage drop of V ≈ 6.9V at the pull-down resistor.
Direction mode can only be activated when the ignition switch is in the ON-position as shown in
Figure 1-1 on page 2.
3.3
Start Input Hazard Warning (Pin 4)
In contrast to the direction switches, the hazard input is a low-side type. The pull-up resistor R10
provides the off-state. R3 is a protection resistor for the input stage. Hazard warning can be acti-
vated independent of the ignition switch position.
3.4
3.5
Supply Voltage Sense (Pin 5)
This pin supplies the lamp outage comparator at pin 8 and is externally connected to the battery
(Kl 30).
Control Input Relay 1 and 2 (Pin 6 and 7)
The feedback detects the bright phase and the dark phase and enables the oscillator.
4
U2044B
4721B–AUTO–09/05
U2044B
3.6
Lamp Outage Detection (Pin 8)
The lamp current is monitored via an external shunt resistor, RShunt 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: 21W/(VS = 12V):
Nominal current of 2 lamps: 2 × 21W/(VS = 12V):
Ilamp = 1.75A
Ilamp = 3.5A
We recommend setting the detection threshold in the middle of the current range: Ioutage ≈ 2.7A
Thus the shunt resistor is calculated as:
R
Shunt = VT (K1)/Ioutage
RShunt = 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 8 from
a too high voltage in the case of shorted lamps.
3.7
3.8
Supply Voltage (Pin 9)
This pin supplies the oscillator, the comparators and the logic parts of the IC.
GND (Pin 10)
The integrated circuit is protected against transients according to ISO-TR 7637-3 level 3 via
resistor R2 to ground (–31). An integrated protection circuit together with external resistors R2,
R3, R4, R6, R8 and R9 limits the current pulses in the IC. The IC is also protected against reversed
battery.
3.9
Control Output Relay 1 and 2 (Pin 11 and 13)
The relay control outputs are high-side drivers with a low saturation voltage and capable of driv-
ing a typical automotive relay with a coil resistance of 60Ω.
3.10 Supply Voltage Power (Pin 12)
This pin supplies the relay drivers connected directly to the battery (Kl 30). It is internally
clamped by a 27-V Z-diode.
5
4721B–AUTO–09/05
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
VS
Value
24
Unit
V
Supply voltage, 1 min, pins 5, 9 and 12
Junction temperature
Tj
150
°C
°C
°C
Ambient temperature range
Storage temperature range
Tamb
Tstg
–40 to +100
–55 to +150
5. Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient, DIP14
Junction ambient, SO14
RthJA
RthJA
90
120
K/W
K/W
6. Electrical Characteristics
Typical values under normal operation in application circuit Figure 1-1 on page 2, VS (+30) = 12V.
Reference point ground (–31), Tamb = 25°C, unless otherwise specified
Parameters
Test Conditions
Pins 5, 9, 12
Pins 5, 9, 12
Pins 11, 13
Symbol
Min.
Typ.
Max.
18
Unit
V
Supply voltage range
Supply current, switches open
Output current for relay driver
VS
IS
8
10
µA
mA
IO
300
RL = 82Ω
VS = 8V
VS = 12V
Saturation voltage
VO
1.0
1.2
V
V
Relay output reverse current
Relay coil resistance
Start delay
Pin 11, 13
IO
RL
ton
0.1
mA
Ω
60
–6
First bright phase
10
ms
VS = 9V
VS = 13.5V
VS = 16V
VS
VS
VS
70.6
85.0
93.0
mV
mV
mV
Control signal threshold
VS = 9V to 16V, pin 8,
Tamb = –140°C to 100°C
Tolerance of control signal threshold
+6
%
Temperature coefficient of control
signal threshold
VS = 13.5V, pin 8
TK
V12
V12
10
27.5
20
µV/K
V
Clamping voltage
Tamb = –40°C to 100°C
25.0
18
30.0
22
Relay output overvoltage detection
(relay disabled)
Tamb = –40°C to 100°C
V
6
U2044B
4721B–AUTO–09/05
U2044B
7. Tolerances
Typical values under normal operation in application circuit Figure 1-1 on page 2, VS (+30) = 12V.
Reference point ground (–31), Tamb = 25°C, unless otherwise specified
Parameters
Test Conditions
Symbol
R1
Min.
Typ.
Max.
Unit
kΩ
Frequency determining resistor
Frequency determining capacitor
6.8
510
47
C1
µF
Normal flashing, basic frequency f1 not
including the tolerance of the external
components R1 and C1
Frequency tolerance
Bright period
∆f1
–5
+5
%
Basic frequency f1
Control frequency f2
Lamp failure
∆f1
∆f2
f2
47
37
53
45
%
%
Frequency increase
Lamp load
2.15 × f1
1
2.3 × f1
Hz
W
PL
8. Ordering Information
Extended Type Number
Package
DIP14
SO14
Remarks
U2044B-MY
Tubed, Pb-free
Tubed, Pb-free
U2044B-MFPY
U2044B-MFPG3Y
SO14
Taped and reeled, Pb-free
9. Package Information
Package DIP14
Dimensions in mm
7.77
7.47
20.0 max
4.8 max
6.4 max
3.3
0.5 min
0.36 max
9.8
8.2
1.64
1.44
0.58
0.48
2.54
15.24
14
8
technical drawings
according to DIN
specifications
1
7
7
4721B–AUTO–09/05
5.2
4.8
Package SO14
Dimensions in mm
8.75
7.62
3.7
1.4
0.25
0.2
0.4
3.8
0.10
1.27
6.15
5.85
14
8
technical drawings
according to DIN
specifications
1
7
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
• Pb-free logo on page 1 added
4721B-AUTO-09/05
• New heading rows in Table “Absolute Maximum Rating” on page 6 added
• Ordering Information on page 7 changed
8
U2044B
4721B–AUTO–09/05
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4721B–AUTO–09/05
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