ALD-12

・All specifications are subject to change without notice.

Analog Modulated Light (ADIM) and PWM Modulated Light Combination Example

ALD

　Determines maximum value for output current in analog modulated light, to enable brightness control at that range, using PWM modulated light.

　　<Modulated Light Example 1 (blue in diagram below)>

　　　Set output current value to 100%, in cases where PWM modulated light is desired at a modulated light range of 100% to 0%

　　<Modulated Light Example 2 (red in diagram below)>

　　　Set output current value to 50%, in cases where PWM modulated light is desired at a modulated light range of 100% to 0%

PWM Modulated Light Voltage and Output Current Examples

Analog modulated light is the modulated light system for changing current amplitude. The benefits this system offer are that low

frequency noise hardly occurs because it does not have an intermittent action and input power source load is small because

input current variation is small. Conversely, because it changes the LED action point, chromaticity varies according to the

modulated light.

PWM modulated light is the system where intermittent actions are made at low frequency in the range of 100Hz to 1kHz, and

this on duty is varied to modulate light. Although this system leaves concern about low frequency noise and the demand for

excessive answering to accommodate input power source, it offers the benefit of small chromaticity variations according to

the modulated light because the LED action point does not change. PWM modulated light comes in two forms: a built-in PWM

modulated light system (this is inside the LED driver generating chopping and sawtooth waves, which are compared against

the external DC voltage to form a modulated light pulse) and an external PWM modulated light system (this directly applies the

pulse from outside to modulate light).

The ALD Series combines analog modulated light and PWM modulated light to enable the generation of modulated light that

suits your needs.

100

50

0

100

50

0