Quick Details
- Place of Origin:
CHINA
- Samples:
Free
- Delivery Time:
Delivery After Payment
- Packing:
DIP-8 50Pcs/Tube 40Tubes/Box 10Boxes/Carton SO-8 100Pcs/Tube 100Tubes/Box 10Boxes/Carton
- Delivery Port:
Dalian
- Max. Production Capacity:
1000000
- Export Ratio:
41% - 50%
- OE Experience:
No
Product Name:LD1041 Auto Moto Flsher Relay ICs Integrated Circuits Auto Ics
LD1041 Auto Moto Flsher Relay ICs Integrated Circuits Auto Ics
Application
Acura; Alfa romeo; Aston martin; audi; Aux; Baolong; Beiqi; Bentley; BMW; Bugatti; Buick; BYD; cadillac; Changan; Changfeng; Chery; chevolet; Chrysler; Citroen; Dadi; DAEWOO; Daihatsu; Dodge; Dongfeng; DADI Auto; Ferrari; fiat; Ford; Foton; Fuqi...
More
Product Description:
OEM No/Model: LD1041
Automotive Direction Indicator ICs
Deacription
LD1041 (analog UAA1041B) was designed for use in conjunction with a relay in automotive applications. It is also applicable for other warning lamps such as “handbrake ON,” etc.
Features
Defective Lamp Detection
Overvoltage Protection
Short Circuit Detection and Relay Shutdown to Prevent Risk of Fire
Reverse Battery Connection Protection
Integrated Suppression Clamp Diode
Circuit Description
The circuit is designed to drive the direction indicator flasher relay. Figure 1 shows the typical system configuration with the external components. It consists of a network (R1, C1) to determine the oscillator frequency, shunt resistor (RS) to detect defective bulbs and short circuits in the system, and two current limiting resistors (R2 / R3) to protect the IC against load dump transients. The circuit can be used either with or without short circuit detection, and features overvoltage, defective lamp and short circuit detection.
The lightbulbs L1, L2, L3, L4 are the turn signal indicators. When switch K1 is closed, after a time delay of t1 (in our example t1≈75 ms), the relay will be actuated. The corresponding lightbulbs (L1, L2 or L3, L4) will flash at the oscillator frequency, independent of the battery voltage of 8.0 V to 18 V. The flashing cycle stops and the circuit is reset to the initial position when switch K1 is open.
Overvoltage Detection
Senses the battery voltage. When this voltage exceeds 20.2 V (12V Flasher) or 30.5V (24 Flasher), (this is the case when two batteries are connected in series), the relay will be turned off to protect the lightbulbs.
Lightbulb Defect Detector
Senses the current through the shunt resistor RS. When one of the lightbulbs is defective, the failure is indicated by doubling the flashing frequency.
Short Circuit Detector
Detects excessive current (Ish > 25 A) flowing in the shunt resistor RS. The detection takes place after a time delay of t3 (t3 ≈ 55 ms). In this case, the relay will be turned off. The circuit is reset by switching S1 to the off position.
Operation with Short Circuit Detection
Pin 6 has to be left open and a capacitor C2 has to be connected between Pin 1 and Pin 2.
Operation without Short Circuit Detection
Pin 6 has to be connected to Pin 2, and the use of capacitor C2 is not necessary. The circuit can also be used for other warning flashers.
Application Information
1. The flashing cycle is started by closing K1.
The switch position is sensed across resistor R2 and RLamp by Input pin 8. Rst = R2 + RLamp.
The condition for the start is: Rst < 3.6 kΩ.
For correct operation, leakage resistance from Pin 8 to ground must be greater than 5.6 kΩ.
2. Flashing frequency: fn = 1/ (R1×C1×Kn)
3. Flashing frequency in the case of one defective lightbulb of 21 W:
fF = 1 / (R1×C1×KF) Kn = 2.2KF
4. t1: delay at the moment when K1 is closed and first flash t1 = K1×R1×C1
5. t2: defective lightbulb det6. t3: short circuit detection delay
Company Name: Dandong Huaao Electronics Co., Ltd.
Address: No.64 Taoyuan street, Dandong, Liaoning, China