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UNISONIC TECHNOLOGIES CO., LTD
U2043
LINEAR INTEGRATED CIRCUIT
FLASHER, SHUNT, PILOT
LAMP TO GND OR VBATT
DESCRIPTION
The UTC U2043 is designed to use 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 VBatt or
GND.
DIP-8
FEATURES
*Temperature and voltage compensated frequency
*Warning indication of lamp failure by means of frequency doubling
* Minimum lamp load for flasher operation 10 W
*Relay output with high current carrying capacity and low saturation
voltage
*Low susceptibility to EMI
SOP-8
ORDERING INFORMATION
Note:
Order Number
Lead Free
Halogen Free
U2043L-D08-T
U2043G-D08-T
U2043L-S08-R
U2043G-S08-R
Pin Assignment: G: Gate D: Drain S: Source
Package
DIP-8
SOP-8
U2043G-D08-T
(1)Packing Type
(1) T: Tube, R: Tape Reel
(2)Package Type
(2) D08: DIP-8, S08: SOP-8
Packing
Tube
Tape Reel
(3)Green Package
(3) G: Halogen Free and Lead Free, L: Lead Free
MARKING
87 6 5
UTC
U2043
1 2 34
Date Code
L: Lead Free
G: Halogen Free
Lot Code
www.unisonic.com.tw
Copyright © 2020 Unisonic Technologies Co., Ltd
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U2043
PIN CONFIGRATION
GND 1
VSS 2
REL 3
OSC 4
LINEAR INTEGRATED CIRCUIT
8 SI
7 LD
6 VSS
5 OSC
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
SYMBOL
GND
VSS
REL
OSC
OSC
VSS
LD
SI
IC ground
Supply voltage, VSS - Power
Relay control output (driver)
Oscillator (C1)
Oscillator (R1)
Supply voltage, Sense
Lamp failure detection
Start input (10a)
DESCRIPTION
BLOCK DIAGRAM AND APPLICATION CIRCUIT
C1
4
6
Measuring comparator
K1 V6-VR3
2
7
+ VSS
+10
R3
Shunt
29 mΩ
Pilot lamp
5W
Pulse
R1 generator
3.8 kΩ
K3 V6-5V
5
10aComparator
3
K2
8
23V
IC Ground
1
Relay
R2
3.3 kΩ
R1
100 Ω
GND
11
10A
5W 21W 21W
21W 21W 5W
Indicator lamps
Pilot lamps
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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U2043
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (Reference point Pin 1)
PARAMETERS
Supply Voltage
Pins 2, 6
Surge Forward Current
tp = 0.1ms
tp = 2ms
tp = 2ms
Pins 2, 6
Pins 2, 6
Pin 8
Output Current Pin 3
Power Dissipation TA = 95°C
Power Dissipation TA = 60°C
Junction Temperature
Ambient Temperature
Storage Temperature
THERMAL DATA
DIP-8
SOP-8
DIP-8
SOP-8
SYMBOL
VSS
IFSM
IFSM
IFSM
IOUT
PD
PD
TJ
TA
TSTG
RATINGS
16.5
1.5
1.0
50
0.3
420
340
690
560
+150
-40 ~ +95
-55 ~ +150
UNIT
V
A
A
mA
A
mW
mW
mW
mW
°C
°C
°C
PARAMETERS
Thermal Resistance (Junction to Ambient)
DIP-8
SOP-8
ELECTRICAL CHARACTERISTICS
SYMBOL
θJA
RATINGS
110
160
UNIT
K/W
K/W
(VSS (+10, Pins 2 and 6) = 12V. Reference point ground (-11), TA = 25°C, unless otherwise specified)
PARAMETERS
SYMBOL
TEST CONDITIONS
MIN TYP MAX
Supply Voltage Range
VSS(+10)
9~15
Relay Output
VOUT
Saturation voltage, IOUT=150mA,
VSS = 9V
1.0
Supply current
Dark phase or stand-by
ISS Bright phase
4.5 8
7.0 11
Relay Output Reverse Current
IOUT
0.1
Relay Coil Resistance
RL
60
Start Delay
tON First bright phase
10
Frequency Determining Resistor
R1
6.8 510
Frequency Determining Capacitor
C1
47
Frequency Tolerance
Bright Period
Δf1
Normal flashing, f1 excluding the
tolerance of R1 and C1
Δf1 Basic frequency f1
Δf2 Control frequency f2
-5
47
37
+5
53
45
Frequency Increase
f2 Lamp outage
2.15xf1
2.3xf1
Control Signal Threshold
VR3 VSS = 15V
VR3 VSS = 9V
VR3 VSS = 12V
Pin 7
75 86 97
56 66 76
66 77 87
Leakage Resistance
RLEAK 10a to GND
25
Lamp Load
PL
10
Note: Typical values under normal operation in application circuit.
UNIT
V
V
mA
mA
mA
Ω
ms
kΩ
μF
%
%
%
Hz
mV
mV
mV
kΩ
W
UNISONIC TECHNOLOGIES CO., LTD
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U2043
LINEAR INTEGRATED CIRCUIT
FUNCTIONAL DESCRIPTION
Pin 1, GND, IC ground
In the case of battery reversal, resistor R4 to ground (-11) will protect the IC against damage. An integrated
protection circuit together with external resistances R2 and R4 limits the current pulses in the IC.
Pin 2, Supply voltage, VSS - Power
On the PCB connection, the arrangement of the supply connections to Pin 2 must be so as to ensure that, the
resistance of VSS 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 and capable to drive a typical automotive
relay with a minimum coil resistance of 60Ω.
Pin 4 and 5 Oscillator (C1 and R1)
Flashing frequency, f1, is determined by the R1 C1 components as follows (see Application Citcuit):
f1
R1
1
C1
1.5
Hz
where
C1 ≤ 47μF
R1 = 6.8kΩ to 510kΩ
In 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)
Pin 6, Supply voltage, Sense
A minimized layer resistance from point VS/shunt to Pin 6 is recommended to accurate monitoring via the shunt
resistor.
Pin 7, Lamp outage detection
The lamp current is monitored via an external shunt resistor R3 and an internal comparator K1 with its reference
voltage of typ. 77mV (VSS = 12V). The outage of one lamp out of two lamps is detected according to the following
calculation:
Nominal current of 1 lamp: 21W / (VSS = 12V): Ilamp = 1.75A
Nominal current of 2 lamps: 2 x 21W / (VSS = 12V): Ilamp = 3.5A.
The detection threshold is recommended to be set in the middle of the current range: Ioutage ≈ 2.7A.
Thus the shunt resistor is calculated as:
R3 = VT (K1) / Ioutage
R3 = 77mV / 2.7A 29mΩ.
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.
Pin 8, Start input
Start condition for flashing: the voltage at Pin 8 has to be less than VSS - 5V (flasher switch closed).
Humidity and dirt may decrease the resistance between 10a and GND. If this leakage resistance is > 5kΩ the IC is
still kept in its off-condition. In this case the voltage at Pin 8 is greater than VSS - 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.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) 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 systems where malfunction
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. UTC reserves the right to
make changes to information published in this document, including without limitation specifications and
product descriptions, at any time and without notice. This document supersedes and replaces all
information supplied prior to the publication hereof.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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