7135 application circuit

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7135 application circuit

The two methods of using the touch switch (Touch SW) and the normally open/normally closed control switch (Slide SW) in the architecture of Figure 1 are different but functionally the same. You can choose the long on/off switch to turn the LED on/off, or the touch switch to make the LED only light when pressed. You can choose between the two methods.

The purpose of JP1 is to be used when it is necessary to test the LED current. When testing, simply disconnect the part and connect the ammeter to the current flowing through the LED. It is important to note that the voltage across the ammeter will have a small voltage difference. A voltage meter can be used to monitor the actual input voltage.

(2) Application of 7135

7135 is a steady current IC. To explore how it is applied to LEDs, first understand the characteristics of the LED itself and the discharge of the battery. The following is a comparison of its specifications and actual testing.

(3) Characteristics of LED

First of all, from the electrical characteristics of the LED to understand the relationship between current / forward voltage / brightness when the LED is operating. The following diagrams, together with the four figures of Figure 2 to Figure 5, can be used to understand which characteristics of the actual LED will be affected during operation, and which part should be noticed when applied.

A. IF vs. Lumens

The LED is driven by current, and the greater the current flowing, the brighter the brightness. Figure 2 and Figure 亮度 show the brightness-current relationship between LumiLED and Edison Power LEDs. It can be seen from Fig. 2 and Fig. 亮度 that the brightness increases as the current flowing through increases. When the LED current is increased from 100mA to 350mA, the brightness is increased by about 60%.