U2044B [ATMEL]
DUAL OUTPUT FLASHER; 双路输出闪光型号: | U2044B |
厂家: | ATMEL |
描述: | DUAL OUTPUT FLASHER |
文件: | 总8页 (文件大小:211K) |
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: O 1 W
• Very Low Susceptibility to EMI
• Protection According to ISO/TR7637/1 Level 4
• Extremly Low Current Consumption < 10 µA (with Switches Open)
• Reverse Polarity Protection
• Three Control Inputs: Left, Right and Hazard Warning
Dual Output
Flasher
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 direc-
tion indicator input with only a small control current makes switch contacts for small
loads possible.
U2044B
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. 4721A–AUTO–05/03
Figure 1. Block Diagram
30
30
9
5
RShunt
30 m
VS-81 mV
+
-
ꢀ
C1
8
4.7 µF
K1
Contact
1
2
+
-
14
R1
R9
82 kꢀ
6
7
VRef1
47 kꢀ
+
-
1
R8
+
-
47 kꢀ
-
+
VS /2
VRef2
-
+
VS-6 V
27.5 V
12
30
11
13
GND 10
3
2
4
R2
R3
4.7 kꢀ
R10
1.2 k
220ꢀ
ꢀ
Hazard warning
R4
R6
Relay
1
ꢀ
4.7 k
4.7 kꢀ
2
right
left
15
31
R5
R7
1.2 kꢀ
1.2 k
ꢀ
12700
2
U2044B
4721A–AUTO–05/03
U2044B
Pin Configuration
Figure 2. 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
Pin Description
Pin
Symbol
OSC
SIL
Function
1
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
4721A–AUTO–05/03
Functional Description
Oscillator (Pin 1 and 14) Flashing frequency, f1, is determined by the R1C1 components as follows (see Figure 1):
1
----------------------------------
f1 W
Hz
R1 P C1 P 1.5
where
C1 ? 47 µF
R1 = 6.8 kꢀ to 180 kꢀ
In the case of a lamp outage, the oscillator frequency is switched to the lamp outage fre-
quency f2 with f2 W 2.2 Pꢁf1.
Duty cycle in normal flashing mode: 50%
Duty cycle in lamp outage mode:
40% (bright phase)
Start Input Right and Left 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.
(Pin 2 and 3)
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 W 6.9 V 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.
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 activated independent of the ignition switch position.
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.
Lamp Outage Detection
(Pin 8)
The lamp current is monitored via an external shunt resistor, RShunt and an internal com-
parator, K1, with its reference voltage of typically 81 mV (VS = 12 V). The outage of one
lamp out of two lamps is detected according to the following calculation:
Nominal current of 1 lamp: 21 W/(VS = 12 V):
Nominal current of 2 lamps: 2 P 21 W / (VS = 12 V):
Ilamp = 1.75 A
Ilamp = 3.5 A
We recommend setting the detection threshhold in the middle of the current range:
Ioutage W 2.7 A
Thus the shunt resistor is calculated as:
R
Shunt = VT (K1)/Ioutage
RShunt = 81 mV/2.7 A = 30 mꢀ
Comparator K1's reference voltage is matched to the characteristics of filament lamps
(see section “Control Signal Threshold”).
4
U2044B
4721A–AUTO–05/03
U2044B
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.
Supply Voltage (Pin 9)
GND (Pin 10)
This pin supplies the oscillator, the comparators and the logic parts of the IC.
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 pro-
tected against reversed battery.
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 driving a typical automotive relay with a coil resistance of 60 ꢀ.
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.
Absolute Maximum Ratings
Reference point pin 1
Parameters
Symbol
VS
Value
24
Unit
V
Supply voltage, 1 min, pins 5, 9 and 12
Junction temperature
Tj
150
LC
LC
LC
Ambient temperature range
Storage temperature range
Tamb
Tstg
-40 to +100
-55 to +150
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient, DIP14
Junction ambient, SO14
RthJA
RthJA
90
120
K/W
K/W
Electrical Characteristics
Typical values under normal operation in application circuit Figure 1, VS (+30) = 12 V.
Reference point ground (-31), Tamb = 25LC, 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 = 82 ꢀ
VS = 8 V
VS = 12 V
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
ꢀ
60
First bright phase
10
ms
5
4721A–AUTO–05/03
Electrical Characteristics (Continued)
Typical values under normal operation in application circuit Figure 1, VS (+30) = 12 V.
Reference point ground (-31), Tamb = 25LC, unless otherwise specified
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
VS = 9 V
VS = 13.5 V
VS = 16 V
VS
VS
VS
70.6
85.0
93.0
mV
mV
mV
Control signal threshold
VS = 9 V to 16 V, pin 8,
Tamb = -140LC to 100LC
Tolerance of control signal threshold
-6
+6
%
Temperature coefficient of control
signal threshold
VS = 13.5 V, pin 8
TK
10
27.5
20
µV/K
V
Clamping voltage
Tamb = -40LC to 100LC
V12
V12
25.0
18
30.0
22
Relay output overvoltage detection
(relay disabled)
Tamb = -40LC to 100LC
V
Tolerances
Typical values under normal operation in application circuit Figure 1, VS (+30) = 12 V.
Reference point ground (-31), Tamb = 25LC, unless otherwise specified
Parameters
Test Conditions
Symbol
R1
Min.
Typ.
Max.
510
47
Unit
kꢀ
Frequency determining resistor
Frequency determining capacitor
6.8
C1
µF
Normal flashing, basic frequency f1
not including the tolerance of the
external components R1 and C1
Frequency tolerance
Bright period
ꢂf1
-5
+5
%
Basic frequency f1
Control frequency f2
ꢁf1
ꢁf2
47
37
53
45
%
%
2.15 Pꢂ
f1
2.3 Pꢂ
f1
Frequency increase
Lamp load
Lamp failure
f2
Hz
W
PL
1
6
U2044B
4721A–AUTO–05/03
U2044B
Ordering Information
Extended Type Number
Package
DIP14
Remarks
U2044B
–
–
U2044B-FP
SO14
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
1.64 0.58
1.44 0.48
9.8
8.2
2.54
15.24
14
8
technical drawings
according to DIN
specifications
1
7
5.2
4.8
Package SO14
Dimensions in mm
8.75
7.62
3.7
1.4
0.2
0.25
0.10
0.4
3.8
1.27
6.15
5.85
14
8
technical drawings
according to DIN
specifications
1
7
7
4721A–AUTO–05/03
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Printed on recycled paper.
4721A–AUTO–05/03
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