Click Philosophy, Created To Switch The Whole Voltage 20W Fluorescent Lamp Power Constant Current Supply Schematic Diagram Revealed In Figure Four

PT4107 is actually a higher voltage step-down type PWM LED led panel light-driven controller, by means of the exterior resistor and the internal zener diode which will be rectified 110V or 220V AC voltage clamp at 20V. When the voltage Vin on over-voltage lockout threshold of 18V, the chips started to work, in accordance with the peak current control mode to generate the exterior MOSFET. The exterior MOSFET’s supply and towards the current sampling resistor indirectly, the resistor voltage straight to the PT4107 chip CS aspect. Once the CS terminal voltage exceeds the internal threshold voltage the current sample, GATE-side drive signal termination in the external MOSFET off. Threshold voltage may be internally set, or by applying a voltage to control the LD aspect. If the necessary soft-start, finish in LD parallel capacitor voltage requirements to become elevated pace and elevated velocity and constant LED current.

PT4107 most important technical qualities: from 18V to 450V broad voltage input variety, constant current output; Frequency jitter to reduce electromagnetic interference, utilization of random source to modulate the oscillation frequency, it might extend the audio energy spectrum, the power spectrum could be expanded effectively reduce little band of electromagnetic interference, reducing system-level design issue; available linear and PWM dimming to help countless 0.06W LED driving applications, functioning frequency of 25kHz-300kHz, may be set by external resistors.

Simply click philosophy, created to change the entire voltage 20W fluorescent lamp power continuous current supply schematic diagram proven in Figure four. In the look into AC 220V, AC energy entry has had 1A fuse FS1 and anti-surge of detrimental temperature coefficient thermistor NTC, EMI filter followed with the L1, L2, and CX1 composition. BD1 is actually a full-bridge rectifier, the inner stress is four silicon diode. C1, C2, R1, D1 ~ D3 composition of passive power aspect correction circuit. PT4107 chip from your T1, D4, C4, R2 ~ R4 formed after the energy provide step-down regulator electronic filter, the filter input impedance is substantial, the output impedance is quite smaller, close to 300V DC higher voltage immediately after rectification by the step-down to the transistor PT4107 Vin of about 18 ~ 20V voltage, to make certain that chip within the complete voltage variety in balance.