T
treez
Guest
The LM5019 is a Buck controller using constant off time control.
We want it to do 24V to 16V at 50mA.
Page 10 and 13 of its datasheet express that "ESR" should sometimes be added to the output capacitance (via an added “ESR resistor”). This is in order to create a ramp voltage at the switching frequency which can be used by the PWM comparator to help give relatively stable regulation of Vout.
.........Though i can certainly see the reasoning behind this, ...for our application, i don’t see the point in doing it. All we want is a 16V DALI bus which will be loaded with 50mA at the most. I appreciate that the LM5019 will operate in Burst mode if we don’t add the “external ESR” to the output capacitor, but i don’t see the problem with that...do you? Even if there’s one volt pk2pk of vout ripple, this is of no concern to us.
LM5019 datasheet
https://www.ti.com/lit/ds/symlink/lm5019.pdf
We want it to do 24V to 16V at 50mA.
Page 10 and 13 of its datasheet express that "ESR" should sometimes be added to the output capacitance (via an added “ESR resistor”). This is in order to create a ramp voltage at the switching frequency which can be used by the PWM comparator to help give relatively stable regulation of Vout.
.........Though i can certainly see the reasoning behind this, ...for our application, i don’t see the point in doing it. All we want is a 16V DALI bus which will be loaded with 50mA at the most. I appreciate that the LM5019 will operate in Burst mode if we don’t add the “external ESR” to the output capacitor, but i don’t see the problem with that...do you? Even if there’s one volt pk2pk of vout ripple, this is of no concern to us.
LM5019 datasheet
https://www.ti.com/lit/ds/symlink/lm5019.pdf