IL33193N datasheet, PDF - EEWORLD Datasheet

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IL33193N: DescriptionAutomotive Analog Circuit; CategoryOther integrated circuit (IC) The signal circuit; File Size199KB，8 Pages; ManufacturerINTEGRAL; Websitehttp://www.integral.by/english.phtml

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IL33193N Overview

Automotive Analog Circuit

IL33193N Parametric

Parameter Name	Attribute value
Maker	INTEGRAL
package instruction	,
Reach Compliance Code	unknown
Base Number Matches	1

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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

= -40° to 125°C for all packages

PIN CONNECTIONS

Vss

Vсс

Relay

Oscillator

Starter

Fault

Detector

Enable

Oscillator

Simplified Block Diagram

SW2

SW1

Starter

Detector

24V

33V

Reference

Voltage

Filter

Relay

Driver

Lamp Fault

Detector

Oscillator

This Device contains 60 active transistors.

IL33193

Vbat

«On» «Off»

«On»«Off»

Fn=1/tn

TIME

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

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.

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