jutek
Full Member level 4
hello
can you tell me how to determine the proper bias current in the attached ldo's opamp?
what current flows through M0 during high or low Iload?
When i size transistors it is enough for high load current, but not enough for low current conditions, current through M0 doesn't flow.
transient response for load step is also not good. when iLoad drops form high to low state LDO's output voltage doesn't regulate and increases. (ldo_out.png)
at m0_current M0 bias current is shown. as you can see, it drops to 0 when iload drops to low value. how to ensure it has a non-zero value??
the circuit is here :
can you tell me how to determine the proper bias current in the attached ldo's opamp?
what current flows through M0 during high or low Iload?
When i size transistors it is enough for high load current, but not enough for low current conditions, current through M0 doesn't flow.
transient response for load step is also not good. when iLoad drops form high to low state LDO's output voltage doesn't regulate and increases. (ldo_out.png)
at m0_current M0 bias current is shown. as you can see, it drops to 0 when iload drops to low value. how to ensure it has a non-zero value??
the circuit is here :