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Category: Light Laser LED Circuits / Led circuits Views: 1112 Rank: 0 The circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as four white LEDs from a 3.3V source and adjusts the total LED current from 1 to 106 mA in 64 steps of 1 dB each. The driver is a charge pump that mirrors the current ISET (sourced from IC3`s SET terminal) to produce a current of (215·ISET±3%) through each LED. Internal circuitry maintains the SET terminal at 0.6V. To control the LED brightness, op amp IC2 monitors the difference between the high-side voltage and the wiper voltage of digital potentiometer IC1. The op amp then multiplies that voltage by a gain to set the maximum output current. Zero resistance at the potentiometer`s W1 terminal corresponds to minimum LED current and, therefore, minimum brightness. visit page.
Related circuits PWM controller drives LEDs from high-voltage lines The circuit forces a current to build up in the L1 coil and the LEDs until the voltage developed across R3 reaches VFB/3.3V. At this point, power switch Q1 turns off, and the magnetizing current keeps circulating in the coil and LEDs, thanks to freewheeling diode D1. To maintain a "clean"... White-LED driver provides 64-step dimming The circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as four white LEDs from a 3.3V source and adjusts the total LED current from 1 to 106 mA in 64 steps of 1 dB each. The driver is a... For those who dont like microcontroller projects, pretend the micro is a dedicated LED driver IC that just happens to have been designed to control 30 LEDs in the shape of a Heart (what a stroke of luck!). And it wont be declared obsolete just after publication like a purpose designed IC might... This circuit was designed on request and can be useful to those whishing to have, say, a red LED illuminated when an appliance is on and a green LED illuminated when the same appliance is off. Any mains operated appliance can be monitored by this circuit, provided a suitable mains switch,... Originally intended as a 3-bell animation circuit for Christmas decorations, the circuit can be used for many other purposes that require a flasher of this kind. By re-connecting U2 (see the data manual), This is the simplest possible way to power an LED off 115VAC. I epoxied a highbrightness yellow LED into the switch plate to my garage light. The light switch is inside my house, but the garage light cannot be seen when the door is closed. This has caused me to leave the garage light on... There have described the involvement benefited LM3909 circuit, which is quite expensive. That's why I prefer to use a much cheaper known timer 555th.Involvement of the tree is a very simple scheme is to figure 2 . It is based on several multivibrator used as a favorite flasher timer 555 in the... This circuit is usable as a Night Lamp when a wall mains socket is not available to plug-in an ever running small neon lamp device. In order to ensure minimum battery consumption, one 1.5V cell is used, and a simple voltage doubler drives a pulsating ultra-bright LED: current drawing is less than... Non-Isolated Buck LED Driver (FL7701) for Small Spaced Dimming Challenges
60V, 98% Efficient, 4-Switch Synchronous Buck-Boost Controller IC Drives LEDs
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