Datasheet

UNISONIC TECHNOLOGIES CO., LTD
L2044
LINEAR INTEGRATED CIRCUIT
DUAL OUTPUT FLASHER

DESCRIPTION
The UTC L2044 is a dual output stages flasher designed as a
relay driver for flashing light control in automotive applications.
Both sides direction indicator input with only a small control current
makes switch contacts for small loads possible. Each side of the
vehicle is controlled separately.
The construction of the hazard switch could be simplified due to
hazard warning input is separate. The flasher will dramatically
increase the flash frequency by a typical ratio of 2:1 if lamp fault is
detected. The UTC L2044 can be directly connected to the battery
due to extreme low current consumption.

FEATURES
* Temperature and Supply Voltage Compensated Flashing
Frequency
* Frequency Doubling Indicates Lamp Fault.
* Two Relay Driver Outputs with High Current-carrying Capacity
and Low Saturation Voltage
* Minimum Lamp Load for Flasher Operation: ≥ 1W
* Very Low Sensitivity to EMI
* Extremely Low Current Consumption<10μA ( at Switches Open)
* Reverse Polarity Protection
* Three Control Inputs: Left, Right and Hazard Warning

ORDERING INFORMATION
Ordering Number
Lead Free
L2044L-D14-T
-

Halogen Free
L2044G-D14-T
L2044G-S14-R
Package
Packing
DIP-14
SOP-14
Tube
Tape Reel
MARKING
DIP-14
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Copyright © 2015 Unisonic Technologies Co., Ltd
SOP-14
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L2044

LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
 PIN DESCRIPTION
PIN No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
PIN NAME
OSC
SIL
SIR
SIHW
VCC
CR1
CR2
LD
VCC
GND
OR1
VS
OR2
OSC
FUNCTION
Oscillator
Start input left
Start input right
Start input hazard warning
VCC
Control input relay 1
Control input relay 2
Lamp failure detection
VCC
ground
Output relay 1
VCC
Output relay 2
Oscillator
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L2044

LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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www.unisonic.com.tw
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L2044

LINEAR INTEGRATED CIRCUIT
ABSOLUATE MAXIUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage, 1 min, pins 5, 9 and 12
VCC
24
V
Junction Temperature
TJ
+125
°C
Operating Temperature
TOPR
-20~ +85
°C
Storage Temperature
TSTG
-40 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL DATA
PARAMETER
Junction to Ambient

SYMBOL
DIP-14
SOP-14
UNIT
°C/W
ELECTRICAL CHARACTERISTICS (VCC = 12V, TA =25°C, unless otherwise specified.)
PARAMETER
Supply Voltage Range
Saturation Voltage
Clamping Voltage
Relay output overvoltage detection (relay disabled)
Control signal threshold
Output current for relay driver
Relay output reverse current
Supply current, switches open
Relay coil resistance
Start delay
Tolerance of control signal threshold
Temperature coefficient of control signal Threshold

θJA
RATINGS
90
120
SYMBOL TEST CONDITIONS
VCC
Pins 5, 9, 12
VCC=8V, RL=82Ω
VOUT
VCC=12V, RL=82Ω
V12
Ta= -20°C ~ 85°C
V12
Ta= -20°C ~ 85°C
VCC=9V
VCC
VCC=13.5V
VCC=16V
IOUT
Pins 11, 13
IOUT
Pins 11, 13
ICC
Pins 5, 9, 12
RL
tON
First bright phase
VCC=9V~16V, Pin 8,
TA= -20°C ~ 85°C
TCVO VCC=13.5V, Pin 8
MIN
8
TYP
25.0
18
27.5
20
70.6
85.5
93.0
MAX UNIT
18
V
1.0
V
1.2
30.0
V
22
V
mV
300
0.1
10
-6
10
mA
mA
μA
Ω
ms
+6
%
10
μV/K
TOLERANCES (VCC = 12V, TA =25°C, unless otherwise specified.)
PARAMETER
Frequency determining resistor
Frequency determining capacitor
Frequency tolerance
Bright period
Frequency increase
Lamp load
SYMBOL
R1
C1
△f1
△f1
△f2
f2
PL
TEST CONDITIONS
Normal flashing, basic frequency f1
excluding the tolerance of R1 and C1
Basic frequency f1
Control frequency f2
Lamp failure
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
MIN
6.8
MAX
510
47
UNIT
kΩ
μF
-5
+5
%
47
37
53
45
2.3×f1
2.15×f1
1
TYP
%
Hz
W
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
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
UTC assum es no responsibility for equipm ent failures that result from using products at values that
exceed, even m om entarily, rated values (such as m axim um ratings, operating condition ranges, or
other param eters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or system s where
m alfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The inform ation
presented in this docum ent does not form part of any quotation or contract, is believed to be accurate
and reliable and m ay be changed without notice.
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