IL33193
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,
NSuffix
D Suffix
without lamp short circuit detection and using a 20 mΩ
SO-8
shunt resistor. The IL33193 has a standby mode of
Plastic DIP
IL33193N
Plastic DIP
operation requiring very low standby supply current and
IL33193D
SO-8
can be directly connected to the vehicle’s battery. It
includes an RF filter on the Fault detection pin (Pin 7) for
T
A
= -40 to 125 C for all
EMI purposes. Fault detection thresholds are reduced
relative to those of the UAA1041, allowing a lower shunt packages
resistance value (20 mΩ) 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 Protection
Internal Free Wheeling Diode Protection
Low Standby Current Mode
Pin connections
Simplified Block Diagram
This device contains 60 active transistors.
1
IL33193
MAXIMUM RATINGS
Rating
Pin 1 Positive Current (Continuous/Pulse)
Pin 1 Negative Current (Continuous/Pulse)
Pin 2 Current (Continuous/Pulse)
Pin 3 Current (Continuous/Pulse)
Pin 8 Current (Continuous/Pulse)
ESD (All Pins Except Pin 4 for Negative Pulse)
ESD (Pin 4 Negative Pulse)
Junction Temperature
Operation Ambient Temperature Range
Storage Temperature Range
Symbol
I1+
I1–
I2
I3
I8
V
]
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
(–40°C
≤
T
A
≤
+125°C, 8.0 V
≤
V
CC
≤
18 V, unless otherwise noted. Typical values
reflect approximate mean at T
A
= 25°C, V
CC
= 14 V at the time of initial device
characterization.)
Characteristic
Battery Voltage Range (Normal Operation)
Overvoltage Detector Threshold (VPin2 – VPin1)
Clamping Voltage (R2 = 220
Ω)
Output Voltage [I = –250 mA (VPin2 – VPin3)]
Starter Resistance (Rst = R2 + RLamp)
Oscillator Constant (Normal Operation, TA = 25°C)
Temperature Coefficient of Kn
Duty Cycle (Normal Operation)
Oscillator Constant (One 21 W Lamp Defect, TA = 25°C)
Duty Cycle (One 21 W Lamp Defect)
Oscillator Constant (T
A
= 25°C)
Standby Current (Ignition “Off”)
Current Consumption (Relay “Off,” Enable Pin 6 High)
Vbat = 8.0 V, R3 = 220
Ω,
T
A
= 25°C
Vbat = 13.5 V, R3 = 220
Ω
Vbat = 18 V, R3 = 220
Ω,
T
A
= 25°C
Current Consumption (Relay “On”)
Vbat = 8.0 V, R3 = 220
Ω,
T
A
= 25°C
Vbat = 13.5 V, R3 = 220
Ω
Vbat = 18 V, R3 = 220
Ω,
T
A
= 25°C
Defect Lamp Detector Threshold [R3 = 220
Ω,
(V
Pin2
–
V
Pin7
)]
Vbat = 8.0 V, T
A
= 25°C
Vbat = 13.5 V
Vbat = 18 V, T
A
= 25°C
Temperature Coefficient of V
S
Symbol
V
b
V
ih
V
cl
V
sat
R
st
K
n
TC
Kn
–
K
f
–
K1
K2
I
CC
I
CC
Min
8.0
19
27
–
–
1.3
–
45
0.63
35
0.167
0.250
–
–
–
–
I
CC
–
–
–
V
S
–
46.5
–
TC
Vs
–
43.6
51.0
57.0
0.3x10
–3
–
56
–
–
1/°C
1.62
2.06
3.30
–
6.0
–
mV
Typ
–
20.2
29.2
–
3.3
1.5
0.001
50
0.68
40
0.180
0.270
2.0
1.40
2.16
2.64
Max
18
22
34
1.5
3.6
1.75
–
55
0.73
45
0.193
0.290
100
–
3.5
–
mA
Unit
V
V
V
V
kΩ
X
1/°C
%
X
%
–
µA
mA
2
IL33193
Figure 1. Normal Operation Oscillator
Timing Diagram
INTRODUCTION
Figure 2. One Defective Lamp
Oscillator Timing Diagram
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 the 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.
3
IL33193
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: F
n
= 1/R1*C1*K
n
. With a defective (open) 21 W
lamp (Figure 2), the flashing frequency changes to: F
n
= 2.2*F
n
.
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
Starter
Pin 8 is connected through a 3.3 kΩ 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 R
S
via the RF filter. The R
S
voltage drop is
compared to a V
bat
dependent internal reference voltage (V
ref
) 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 (I
CC
= 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.
Figure 3. Clamping Voltage versus
Temperature
Figure 4. Overvoltage Detection versus
Temperature
4
IL33193
Figure 5. Supply Current versus
Temperature
Figure 6. Output Voltage versus
Temperature
Figure 7. Defect Lamp Detection versus
Temperature
Figure 8. Oscillator Constant versus
Temperature
5
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