Abstract
High-speed and High-current Phase Width Modulator Driver for High-power Infrared LEDs
Highlights
Nowadays, mobile phones, tablets, liquid crystal display (LCD) TVs, and cars use infrared light-emitting diodes (LEDs).(1,2) With the increasing range of application of 3D sensing technology, the demand for high-power and high-current infrared LEDs is increasing
It consists of a set of control software, a DC power supply, a signal generator, an oscilloscope, a photometric detector, and a high-current and high-speed phase width modulation (PWM) driver
To verify that the rising and falling times of light-emitting signals that are the same as the pulse widths can be obtained from the proposed high-current and high-speed PWM driver, a Newport 818-BB-21 photometric detector is used to measure high-power infrared LEDs
Summary
Mobile phones, tablets, liquid crystal display (LCD) TVs, and cars use infrared light-emitting diodes (LEDs).(1,2) With the increasing range of application of 3D sensing technology, the demand for high-power and high-current infrared LEDs is increasing. The advent of the high-power infrared LEDs has opened up new application areas, especially 3D sensing of mobile phones and distance detection of cars A direct-drive circuit with a signal generator uses a 50 ohms current-limited resistor in series with the high-power infrared LEDs to limit the highest pulse current flowing through the LEDs, as shown in Fig. 4.(13,14) The advantage of the driving circuit is that the pulse-width time of the PWM can be adjusted to as small as 100 ns. The advantages of the proposed driver will be detailed
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