TECHNICAL DATA
Automotive Direction Indicator
The IL33193 is a new generation industry standard UAA1041 “Flasher”.
It has been developed for enhanced EMI sensitivity, system reliability, and
improved wiring simplification. The IL33193 is pin compatible with the
UAA1041 and UAA1041B in the standard application configuration as shown
in Figure 9, without lamp short circuit detection and using a 20 mΩ shunt
resistor. The IL33193 has a standby mode of operation requiring very low
standby supply current and can be directly connected to the vehicle’s battery.
It includes an RF filter on the Fault detection pin (Pin 7) for EMI purposes.
Fault detection thresholds are reduced relative to those of the UAA1041,
allowing a lower shunt resistance value (20 mW) to be used.
• Pin Compatible with the UAA1041
• Defective Lamp Detection Threshold
• RF Filter for EMI Purposes
• Load Dump Protection
• Double Battery Capability for Jump Start
IL33193
ORDERING INFORMATION
IL33193N
DIP
IL33193D
SOIC
T
A
= -40° to 125°C for all packages
PIN CONNECTIONS
Vss
1
Vсс
2
Relay
3
Oscillator
4
8
Starter
7
Fault
Detector
6
Enable
5
Oscillator
Simplified Block Diagram
1
SW2
SW1
Starter
8
2
Detector
24V
33V
Reference
Voltage
RF
Filter
7
3
Relay
Driver
Lamp Fault
Detector
6
4
5
Oscillator
This Device contains 60 active transistors.
1
IL33193
MAXIMUM RATINGS
*
Rating
Pin1 Positive Current (Continious/Pulse)
Pin1 Negative Current (Continious/Pulse)
Current (Continious/Pulse)
Current (Continious/Pulse)
Current (Continious/Pulse)
ESD(Aii Pins Except Pin4 for Negative Pulse)
ESD(Pin 4 Negative Pulse)
Jinction Temperature
Operation Ambient Temperature Range
Storage Temperature Range
Simbol
I1+
I1-
I2
I3
I8
V
ESD
V
ESD4-
T
J
T
A
T
STG
Value
150 to 500
-35 to -500
±350
to
±1900
±300
to
±1400
±25
to
±50
±2000
-1000
150
-40 to +125
-65 to +150
Unit
mA
mA
mA
mA
mA
°V
°V
°C
°C
°C
ELECTRICAL CHARACTERISTICS
(-45
O
C
≤
T
A
≤
+125
O
C, 8.0 V
≤
V
CC
≤
18.0 V, unless otherwise noted.
Typical values reflect approximate mean at T
A
= 25
O
C, V
CC
= 14 V at the time of initial device characterization.)
Characteristic
Battery Voltage Range (Normal Operation)
Overvoltage Detector Threshold (V
Pin2
– V
Pin1
)
Clamping Voltage (R2 = 220
Ω)
Output Voltage [I = -250 mA (V
Pin2
– V
Pin3
)]
Starter Resistance (R
st
= R2 +R
Lamp
)
Oscillator Constant (Normal Operation, T
A
= 25
O
C)
Temperature Coefficient of K
n
Duty Cycle (Normal Operation)
Oscillator Constant (One 21 W Lamp Defect, T
A
= 25
O
C)
Duty Cycle(One 21 W Lamp Defect)
Oscillator Constant (T
A
= 25
O
C)
Standby Current (Ignition «Off»)
Current Consumption (Relay «Off», Enable Pin 6 High)
V
bat
= 13.5 V, R3 = 220
Ω
Current Consumption (Relay «On»)
V
bat
= 13.5 V, R3 = 220
Ω
Defect Lamp Detector [R3 = 220
Ω,
(V
Pin2
– V
Pin7
)]
V
bat
= 13.5 V
Symbol
V
b
V
ih
V
cl
V
sat
R
st
K
n
TC
Kn
-
K
f
-
K1
K2
I
CC
I
CC
I
CC
V
S
Min
8.0
19
27
-
-
1.3
-
45
0.59
35
0.150
0.200
-
-
-
42.5
Max
18
22
34
1.5
3.6
1.75
-
55
0.75
45
0.240
0.290
100
3.5
6.0
56
Unit
V
V
V
V
kΩ
1/
O
C
%
%
µA
mA
mA
mV
2
IL33193
Vbat
Vbat
«On» «Off»
«On»«Off»
t1
tn
Fn=1/tn
TIME
tf
Ft=1/tf
TIME
Figure 1 - Normal Operation Oscillator
Timing Diagram
Figure 2 - One Defective Lamp Oscillator
Timing Diagram
INTRODUCTION
The IL33193 is designed to drive the direction indicator flasher relay. It is a new generation industry standard
UAA1041 “Flasher”. It consists of the following functions:
• Supply and Protections
• On–Chip Relay Driver
• Oscillator
• Starter Functions
• Lamp Fault Detector with Internal RF Filter
• Standby Mode
Supply and Protection Systems
Pin 1 is connected to ground via resistor R3 which limits he current in the event of any high voltage transients. Pin 2
(VCC) is the positive supply and may be connected directly to the vehicle’s battery voltage. Overvoltage and Double
Battery Protection: When the applied VCC to VSS voltage is greater than 22 V, the overvoltage detector circuit turns
the relay driver off. Both the device and the lamps are protected if two 12 V batteries are connected in series and used
to jump start the vehicle.Load Dump Overvoltage Protection: A 29 V overvoltage detector protects the circuits against
high voltage transients due to load dumps and other low energy spikes. The relay driver is automatically turned on
whenever the VCC to VSS voltage is greater than 34 V. Overvoltage Protection, High Voltage Transients: The Enable
and the Starter pins are protected against positive and negative transients by internal on–chip diodes.
On–Chip Relay Driver
The device directly drives the flasher relay. The output structure is an Emitter of an NPN transistor. It contains the
free wheeling diode circuitry necessary to protect the device whenever the relay is switched off.
Oscillator
The device uses a sawtooth oscillator (Figure 1). The frequency is determined by the external components C1 and R1.
In the normal operating mode, the flashing frequency is: Fn = 1/R1*C1*Kn. With a defective (open) 21 W
lamp (Figure 2), the flashing frequency changes to: Fn = 2.2*Fn.
The typical first flash delay (the time between the moment when the indicator switch is closed and the first lamp flash
occurs) is: t1 = K1*R1*C1 The fault detection delay is from the time relay R1 is on and fault detection is enabled.
Where a 21 W lamp opens, the delay is expressed as: t2 = K2*R1*C1
3
IL33193
Starter
Pin 8 is connected through a 3.3 kW resistor to the flashing lamp. Pin 8 is the input to the Starter function and senses
the use of S1 by sensing ground through the lamp (Figures 9 and 10).
Lamp Fault Detector with Internal RF Filter
A Lamp defect is sensed by the lamp fault detector’s monitoring of the voltage developed across the external shunt
resistor RS via the RF filter. The RS voltage drop is compared to a Vbat dependent internal reference voltage (Vref) to
validate the comparison over the full battery voltage range. A detected fault causes the oscillator to change frequency
(Figure 2).
Standby Mode
When the ignition key and warning switches are open; Enable is in a low state and the internal switches, SW1 and
SW2, are open and no current passes through the circuit. In this condition, the device’s current consumption is zero
(ICC = 0). When ignition key and warning switches are closed; Enable is in a high state with SW1 and SW2 being
closed and the circuit is powered on.
Main differences between UAA1041B & IL33193
The IL33193 is pin compatible with the UAA1041.
Supply Current
Supply current is more stable on the IL33193 when the device is in “on” or “off” state. In “on” state the supply current
is only 40% higher than when in the “off” state, as compared to a ratio of 3 times for the UAA1041. This results in a
lowern voltage drop across the ground resistor R3 (see On–Chip Relay Driver).
Short Circuit Detection
The IL33193 has no short circuit detection.
Standby Mode (Pin 6)
The UAA1041 has no standby mode. Pin 6 is used as an Enable/Disable for the short circuit detection. The IL33193
uses Pin 6 to set the device in standby mode. If Pin 6 is connected to ground, the IL33193 is in the standby mode. In
this mode, standby current is very low and Pin 8’s starter resistor R2 and a 2.0 kW internal resistor are switched off. As
soon as Pin 6 is at a high level (typical threshold = 2Vbe) the device becomes active. In the application, the IL33193
can be connected directly to the battery and awakened whenever Pin 6 is connected to the vehicle’s battery by way of a
protection resistor and the ignition key switch.
Lamp Defect Detection (Pin 7)
The UAA1041 operates with a 30 mW shunt resistor to sense the lamp current. It’s lamp defect detection threshold of
Pin 7 is typically 85 mV. The IL33193 is designed to operate with 20 mW shunt resistor and at a reduced threshold of
50 mV. This reduces power generation in the flasher module. In addition, the IL33193 incorporates an RF filter to
enhance RFI immunity.
Load Dump and Overvoltage Behavior
The UAA1041 and IL33193 both behave the same in this regard. Both have double battery detection and lamp turn–off
protection in the event of a jump start. During load dump, both devices are protected by an internal 30 V zener diode
with the relay activated during a load dump.
Relay Driver
Drive capability of both devices is the same. Free wheeling diode protection is internal to both devices. The free
wheeling voltage is 2Vbe for the UAA1041 and 3Vbe for the IL33193. This results in a higher clamp voltage across the
relay and thus in a faster turn–off. In addition, the lower “on” state supply current is lower on the IL33193 and thus the
voltage drop across the ground resistor R3 is reduced. This results in an even higher clamp voltage across the relay.
Oscillator Phase
The oscillator phase is opposite on the IL33193 as compared to the UAA1041. The Oscillator voltage is falling
during “on” state and rising during “off” state for the IL33193.
4
IL33193
V
cl
, CLAMPING VOLTAGE (V)
V
ih
, OVERVOLTAGE DETECT THRESHOLD (V)
T
A
, AMBIENT TEMPERATURE (
O
C)
T
A
, AMBIENT TEMPERATURE (
O
C)
Figure 3 – Clamping Voltage versus Temperature
I
CC
, SUPPLY CURRENT (mA)
Vbat = 13.5B
R2 = 220
Ω
Figure 4 – Overvoltage Detector versus Temperature
V
sat
, OUTPUT VOLTAGE (V)
Vbat = 13.5V
I = 250 mA
Relay
Relay «Off»
T
A
, AMBIENT TEMPERATURE (
O
C)
T
A
, AMBIENT TEMPERATURE (
O
C)
Figure 5 – Supply Current versus Temperature
LAMP DEFECT DETECTION THRESHOLD (mV)
Vbat = 13.5V
R2 = 220
Ω
Figure 6 – Output Voltage versus Temperature
K
f
, OSCILLATOR CONSTANT (TIMES)
T
A
, AMBIENT TEMPERATURE (
O
C)
T
A
, AMBIENT TEMPERATURE (
O
C)
Figure 7 – Defect Lamp Detection versus Temperature
Figure 8 – Oscillator Constant versus Temperature
5
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