NCP1380 fixed switching frequency of the driven circuit NCP1236 and changer using the effect of switching at a minimum voltage (valley switching) with the controller NCP1380. For the needs of comparison was designed a test board with NCP1380. Design resources comes from the 65 W adapter with controller NCP1236 described in the application note . Unchanged was taken as the input of the EMI filter, a power circuit, a feedback circuit with a TL431 and a large part of the motive circuit.
At the source with NCP1380 is on the contrary the switching frequency dependent on the input voltage. With the increasing voltage on the capacitor voltage an intermediate circuit Cbulk increases the steepness of the increase in the current of the primary winding and by increasing switching frequency. At low input voltage 115 is at full load on the capacitor Cbulk ripple 68, a switching frequency that varies between 36,6 and to 45.2 kHz.
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Published: 2016/06/08 Tags: power electronic projects, smps circuits, smps projects, smps schematic
ATmega16 Digital Laboratory power supply IR2153 SMPS LT3081 L4970
0-30V 0-6A Adjustable Laboratory power supply LCD Display ATmega16 controlled The basic involvement of the entire laboratory resources. Ac mains voltage 230V is transformed into two equal dc voltage 35V and also on the two voltage with a value of 5V for various polaritách. To a voltage of 35V is connected part of the Active cooling. All these strains lead to Regulatory blocks 1 and 2. You have the task to stabilize the input voltage and vary its size depending on the set value of the output voltage. They also contain the function of restricting the output current. Both of these electrical variables are set by using part of the Digital management.
NCP1380 Rücklauf Schaltnetzteil Schaltung 12V 5.8 A
NCP1380 Feste Schaltfrequenz der angetriebenen Schaltung NCP1236 und-wechsler mit dem Effekt der Umstellung auf eine minimale Spannung (valley-switching) mit dem controller NCP1380. Für die Bedürfnisse der Vergleich wurde eine test-platine mit NCP1380. Ressourcen für das Design stammt aus der 65-W-adapter mit controller NCP1236 beschrieben in application note . Unverändert übernommen wurde, wie der Eingang des EMI-filter, eine power-Schaltung, eine feedback-Schaltung mit TL431 und ein großer Teil der motive-Schaltung.