AMLDL-3070Z 데이터 시트보기 (PDF) - AIMTEC

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AMLDL-3070Z

Up to 1000mA | LED Driver

AIMTEC 

Recommended Class B EMI Filter:

Series AMLDL-Z

Up to 1000mA | LED Driver

+Vin

-Vin

L

+

10uF

-

VADJ

+

+Vout

1st LED

1

AMLDL-Z

-Vout

-

Last LED

1

Analogue DIM

PWM Dim/ON/OFF

Model Number

AMLDL-3030Z

AMLDL-3035Z

AMLDL-3050Z

AMLDL-3060Z

AMLDL-3070Z

AMLDL-30100Z

Inductor Value (µH)

68

68

27

27

27

27

Thermal Feedback Circuit

+Vin

R1

4.7K

BZX284C6V2

R2

1

10K

R3

Q1

10K

Thermistor

B 3900

VADJ

10K

1

+Vin

AMLDL-Z

-Vin

GND

Thermally Connected

+Vout

-Vout

1st LED

1

Last LED

1

The selection of components for the thermal feedback circuit is depends on the choice of R2 and R3 and the effectiveness of

the LED heatsink. To optimize the LED brightness control at high temperatures, the LEDs must have a sufficient thermal

extraction path, if not the reduction in drive current will not be optimal.

The thermal control threshold points are set by adjusting R2. Three values (33K, 22K, and 10K) were tested. These values

were chosen to provide thermal break points of approximately 25ºC, 40ºC, and 60ºC.

Note, that the LED drive current will not continually dim to zero – the thermal controls applying DC control to that VADJ pin

has a dimming ratio from maximum current of approximately 5:1.

Once the reduced DC level drops below the shutdown threshold of around 200mV, the LED drive current will fall to zero and

the LEDs will be off.

The slope of the current reduction is determined by the beta value of the thermistor. The larger the Beta value the sharper

will be the resultant current control response. The slope of the current reduction is also affected by Q1’s base emitter voltage

variation with temperature.

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