1. Change the reference current of the feedback module
Regulating the reference current is the most basic way to regulate the output current of a switching power supply, and it can usually be achieved by rotating a potentiometer or toggling a switch. Changing the reference current allows the magnitude of the feedback current to be compared to it, which controls the on-time of the switch and thus the magnitude of the output current. However, it is important to note that the range of the reference current is limited, and too much or too little will cause the feedback circuit to fail, so it needs to be adjusted on a case-by-case basis.
2. Adjust the gain of the feedback circuit
Adjusting the gain of the feedback circuit can change the strength of the feedback signal, which can often be achieved by adding or subtracting resistance from the reference capacitor. Increasing the gain of the feedback circuit can make the circuit more sensitive, the feedback current changes more obviously, and the output current can be adjusted more widely. However, too large gain will cause excessive noise and distortion in the feedback circuit, and reduce the performance of the switching power supply, so it is necessary to increase the gain appropriately under the premise of ensuring stability.
3. Adjust the value of inductance, capacitor and other components
Changing the value of the output current of the switching power supply can also be adjusted on components such as inductors and capacitors, which are the main factors affecting the feedback current. For example, increasing the value of the inductance can decrease the output current of the switching power supply, while decreasing the value of the capacitance can increase the output current of the switching power supply. However, it is important to note that the impact of these components is relatively limited and needs to be selected and adjusted on a case-by-case basis.
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