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Product Name:LD2044 Auto Moto Dual Output Flasher Relay Flasher Ics
LD2044 Auto Moto Dual Output Flasher Relay Flasher Ics
Application
Acura; Alfa romeo; Aston martin; audi; Aux; Baolong; Beiqi; Bentley; BMW; Bugatti; Buick; BYD; cadillac; Changan; Changfeng; Chery; chevolet; Chrysler; Citroen; Changhe Auto; Dadi; DAEWOO; Daihatsu; Dodge; Dongfeng; DADI Auto; Ferrari; fiat; Ford; Foton...
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Product Description:
OEM No/Model: LD2044
Dual Output Flasher ICs
Description
The integrated circuit LD2044 (analog U2044B) is used in relay controlled automotive flashers. With two output stages each side of the vehicle is controlled separately. A left and a right direction indicator input with only a small control current makes switch contacts for small loads possible.
The separate hazard warning input simplifies the construction of the hazard switch. Lamp outage is indicated by frequency doubling during direction mode. Thanks to the extreme low current consumption LD2044 can be connected to the battery directly. The IC can used for 24V circuit and control LED.
Features
Temperature and supply voltage compensated flashing frequency
Frequency doubling indicates lamp outage
Two relay driver outputs with high current-carrying capacity and low saturation voltage
Minimum lamp load for flasher operation: ≥1 W
Very low susceptibility to EMI
Extremly low current consumption < 10 μA (@switches open)
Reverse polarity protection
Three control inputs: left, right and hazard warning
Functional Description
Pin 1 and Pin 14, Oscillator
Flashing frequency, f1, is determined by the R1C1 components as follows (see figure 2):
f1≈ 1 / (R1×C1×1.5) Hz, where C1 47 uF, R1 = 6.8 kΩ to 510 kΩ
In the case of a lamp outage the oscillator frequency is switched to the lamp outage frequency f2 with
f2 ≈ 2.2×f1.
Pin 2 and Pin 3, Start input right and left
Flashing is disabled as long as the input comparator is tied to GND (pull-down resistor R7 or R5). The high side flasher switch ”left” or ”right” changes the comparator status and enables the output stage at Pin 11 or Pin 13. R6 and R4 are protection resistors for the input stage.
With an open flasher switch the current consumption is only I 10uA. The IC kept in stand-by mode until there is a voltage drop of V ≈6.9 V at the pull-down resistor.
Direction mode can only be activated when the ignition switch is in ON-position as shown in figure 2.
Pin 4, Start input hazard warnig
In contrast to the direction switches, the hazard input is a low-side type. The pull-up resistor R10 provides the offstate. R3 is a protection resistor for the input stage.
Hazard warning can be activated independent of the ignition switch position.
Pin 5, Supply voltage sense
This pin supplies the lamp outage comparator at Pin 8 and is externally connected to the battery (30) .
Pin 6 and 7, Control input relay 1 and 2
The feedback detects the bright phase and the dark phase and enables the oscillator.