Summary:
A circuit diagram of a general-purpose input 12 V, 350 mA constant voltage/constant current flyback power supply designed using the LinkSwitch-II family of LNK605DG (U1) devices. Typical applications include LED drivers or battery chargers that require constant voltage/constant current (CC/CV) output characteristics.
design feature
- Accurate primary side constant voltage / constant current controller eliminates secondary side control and optocoupler
- No need for current sense resistors for maximum efficiency
- Solutions that use few components and reduce cost and improve reliability
- Overheat protection – Strict tolerance range (±5%) plus hysteresis recovery ensures PCB temperature is safe under all conditions
- Automatic restart output short circuit and open loop protection
- EcoSmart? – Easily meet all current and proposed international energy efficiency standards – China (CECP) / CEC / EPA / European Commission
- On/Off control for constant efficiency at very light loads
- No-load power consumption <200 mW at 265 VAC input
- Ultra-low leakage current: <5 μA at 265 VAC input (no Y capacitor required)
- Easily meet EN55015 and CISPR-22 Class B EMI standards
- Green package: halogen-free and RoHS compliant
4.2W isolated LED driver circuit diagram
See the uploading documentation for details (click to download)
Semiconductor Fuse And Ferrite
Fuse refers to an electric appliance that, when the current exceeds the specified value, melts the fuse and disconnects the circuit with the heat generated by itself.When the current exceeds the specified value for a period of time, the fuse melts and disconnects the circuit with the heat generated by the fuse itself.A current protector made from this principle.The fuse is widely used in high and low voltage power distribution system and control system as well as power equipment.
Ferrite is a metal oxide with ferrous magnetism.As far as electrical properties are concerned, the resistivity of ferrite is much larger than that of single metal or alloy magnetic materials, and it has higher dielectric properties.Ferrite magnetic energy also shows high permeability at high frequencies.As a result, ferrite has become a non-metallic magnetic material widely used in the field of high frequency and weak current.Due to the low ferrite magnetic energy stored in the unit volume, saturated magnetic induction strength (Bs) and low (usually only pure iron 1/3 ~ 1/5), and thus limits its higher requirements in the low-frequency magnetic energy density in the field of high voltage and high power applications.
Semiconductor Fuse and Ferrite,Fuse Cutout, Protection Fuse, Square Fuse, Fuse Link, Ceramic Fuse
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