Buck IC boosts battery voltage for white LED


Posted on Apr 22, 2012

Figure 1 presents an alternative to the typical boost power regulator. A buck-converter IC, IC1, generates the higher voltage that the white-light LED needs. An internal buck power stage connects between VIN and PGND, sourcing current to output Pin L. This circuit operates by turning on the high switch, thereby connecting the battery voltage across inductor L1. Once inductor L1 stores sufficient energy, the high-side switch turns off. The inductor current drives the switching node negative, and energy transfers through the low side into output capacitor C1, creating an essentially lossless switching event. Also, because the high- and low-side switches are MOSFETs, voltage drop is lower than that of a diode implementation; therefore, efficiency can be high.






Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Low-volts alarm
Make an Atom Synchronised Clock from a 1950s Slave Dial using Arduino
microcontroller Why this transistor logic as switch is not working
High Impedance DC Voltmeter Circuit Using Op Amp
build one transistor fm radio
low current relay circuit
how to interface rfid with 8051
temperature control circuit 555 ic
Gentle Breeze
TDA7000 FM Radio Receiver Circuit
Free-Electron Pump (FEP) Experiments
Stepping CS6061A touch dimmer light circuit



Top