1. Since the inductor current rises with a slope determined by Vin-Vo, the
waveform responds immediately to changes in the input voltage, eliminating
delayed response and gain changes with input changes...
2. Since the error amplifier now controls the current, the effect of the
inductor is minimized, and the filter now only provides a single pole to the
feedback loop, which both simplifies compensation and achieves higher Gain
Bandwidth...
3. The inherent pulse-by-pulse current limit only needs to clamp the
control signal from the error amplifier (chips like the commonly used 3843 are
clamped to 1V), and it is easy to achieve load sharing when the power supplies
are connected in parallel. (For example, it can alleviate the bias phenomenon of
push-pull topology)
While the improvements offered by current mode have many benefits, they
also have their own set of issues that must be taken into account in the design.
The following briefly describes its shortcomings:
1. There are two feedback loops, which increase the man of circuit
analysis;
2. When the duty cycle is greater than 50%, the control loop will become
unstable, and additional slope compensation needs to be adopted;
3. Since the control modulation is based on a signal derived from the
output current, resonances in the power stage can introduce noise into the
control loop;
4. The current spike caused by the transformer winding capacitance and the
reverse recovery current of the secondary rectifier;
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5. Since the control loop is used to implement the current drive, the load
regulation rate becomes poor;
6. Coupled inductors are required for multiple outputs to obtain acceptable
voltage regulation.
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