Other Parts Discussed in Thread: TPS61378-Q1, LM2623
I need to generate 8.0V/0.3A output for a 2W speaker driver.
The input is from another buck regulator generating 3.8V ( varies from 3.590V to 3.916V ) from automotive battery 14V.
I have referred the datasheet and AN1221.
1. May i know what is the advantage of Gated oscillator control scheme? Is it suited for my application here
2.Any simulation model for the PN available?
3. It is not exactly clear to me how this device function the R5 and C3 selection in AN1221 is not straight forward
If i check normal boost equation for duty 1-vin/vout for my application the duty can vary from 51% to 55%. So do i need R5?
4. The output capacitor AN1221 recommends 68uF minimum, is there any calculation for the same. Normally boost regulator the output capacitance depends on Ripple spec and for approximately 25mV ripple with duty 55% and Fsw 1.4MHz, Iout =0.3A im getting 20uF as sufficient using traditional Boost output capacitor equation.