T
treez
Guest
Hello,
I have designed a buckboost LED driver and have only so far simulated it. (in LTspice)
The schematic is attached.
Also attached is a LTspice waveform from the simulation. It shows the COMP pin and LED current at startup.
(COMP pin is output of error amplifier)
When I calculated the feedback loop with a certain method, it gave a crossover frequency of >100KHz and no phase margin, and yet the simulation runs as smooth as can be.
spec of buckboost led driver is:-
Constant off time,
fsw = 119KHz at 10vin
vOUT = ~35v (9 series LEDs)
ILEDS= 500mA
CCM
LTspice simulation also attached
I have designed a buckboost LED driver and have only so far simulated it. (in LTspice)
The schematic is attached.
Also attached is a LTspice waveform from the simulation. It shows the COMP pin and LED current at startup.
(COMP pin is output of error amplifier)
When I calculated the feedback loop with a certain method, it gave a crossover frequency of >100KHz and no phase margin, and yet the simulation runs as smooth as can be.
spec of buckboost led driver is:-
Constant off time,
fsw = 119KHz at 10vin
vOUT = ~35v (9 series LEDs)
ILEDS= 500mA
CCM
LTspice simulation also attached