In this manner, the auto-restart can alternately enable and disable the switching of the power Sense FET until the fault condition is eliminated see figure 6. This causes Vcc to fall. Assuming that the 0. Vo Voset VFB 0. Temp Feedback Source Current vs. This zener diode also increases the immunity against line surge.
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In this situation, the protection circuit should be activated in order to protect the SMPS. We strive to provide the most reasonable prices matching the quality of the goods.
dm05565r When Vcc reaches 12V, the internal high voltage current source leed disabled and the power is supplied from the auxiliary transformer winding. Temp Current Limit vs. In this condition, Vfb continues increasing until it reaches 6V, when the switching operation is terminated as shown in figure 7. When the drain pin and feedback pin are shorted, the zener diode fails and remains short, which causes the fuse F1 blown and prevents explosion of the opto-coupler IC Relevancy Transaction Level Response Rate.
Over load protection t Normal operation Fault situation Normal operation Figure 6.
We have a large stock and the prices are variable,so sometimes the prices we post are not accurate. Then, Vfb climbs up in a similar manner to the over load situation, forcing the preset maximum current to be supplied to the SMPS until the over load protection is activated.
You can ensure product safety by selecting from certified suppliers, including 8 with Other, 3 with ISO certification.
Typical Flyback Application Rev. Donpv philips lcd tv power supply board power supply board pfl D,0565r If the sensing resistor voltage is greater than the AOCP level for longer than ns, the reset signal is applied to the latch, resulting in the shutdown of SMPS. Related Products from Alibaba.
At the instant the internal Sense FET is turned on, there usually exists a high current spike through the Sense FET, caused by primary-side capacitance and secondary-side rectifier reverse recovery. At startup, the internal high voltage current source supplies internal bias and charges the external capacitor that is connected to the Vcc pin.
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These parameters indicate the inductor current. As the load decreases, the feedback voltage decreases. If the part you received is certify be defective,you can apply to get replace or get refund. The articles, pictures, news, opinions, videos, or information posted on this webpage excluding all intellectual properties owned by Alibaba Group in this webpage are uploaded by registered members of Alibaba. This pin is internally connected to the inverting input of the PWM comparator.
If you are suspect of any unauthorized use of your intellectual property rights on this webpage, please report it to us at the following: In this manner, the auto-restart can alternately enable and disable the switching of the power Sense FET until the fault condition is eliminated see figure 6. About product and suppliers: Because of the pulse-by-pulse current limit capability, the maximum peak current through the Sense FET is limited, and therefore the maximum input dm055r is restricted with a given lsd voltage.
These parameters, although guaranteed at the design, are not tested in mass production. Vo Voset VFB 0. We are not responsible for any accidents, delays or other issues caused by the forwarder. Waveforms of burst operation 5.
Any items must be returned in their original condition to qualify for a refund or replacement. Supplier Types Trade Assurance. At startup, an internal high voltage current source supplies the internal bias and charges the external capacitor Cvcc that is connected to the Vcc pin as illustrated in figure 4.
Imports of flat panel tv repair lcd tv power supply board repair succinctly collection lcd color tv repair appliance repair books books Samsung lg philips tv repair tutorial maintenance tips CN In order to avoid this undesired operation, the over load protection circuit is designed to be activated after a specified time to determine whether it is a transient situation or an overload situation.
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