Straight Gate
Posted on Wednesday, July 13th, 2005 at 9:21 am
BD1 Is A Full-bridge Rectifier, The Inner Pressure Is Four Silicon Diode
PT4107 is a higher voltage step-down sort PWM LED led panel light-driven controller, through the exterior resistor and the internal zener diode that will be rectified 110V or 220V AC voltage clamp at 20V. When the voltage Vin on over-voltage lockout threshold of 18V, the chips began to function, in accordance with the peak current manage mode to drive the exterior MOSFET. The exterior MOSFET’s supply and to the current sampling resistor indirectly, the resistor voltage straight towards the PT4107 chip CS side. Once the CS terminal voltage exceeds the internal threshold voltage the current sample, GATE-side drive signal termination of your exterior MOSFET off. Threshold voltage is usually internally set, or by applying a voltage to control the LD aspect. In the event the required soft-start, end in LD parallel capacitor voltage wants to be increased pace and increased pace and steady LED current.
PT4107 principal technical traits: from 18V to 450V wide voltage input array, continuous current output; Frequency jitter to minimize electromagnetic interference, utilization of random supply to modulate the oscillation frequency, it might extend the audio power spectrum, the power spectrum might be expanded effectively reduce smaller band of electromagnetic interference, decreasing system-level design issues; on the market linear and PWM dimming to assistance a huge selection of 0.06W LED driving programs, operating frequency of 25kHz-300kHz, is often set by external resistors.
Click on philosophy, designed to change the entire voltage 20W fluorescent lamp power continuous current supply schematic diagram proven in Figure 4. From your look into AC 220V, AC power entry has had 1A fuse FS1 and anti-surge of detrimental temperature coefficient thermistor NTC, EMI filter adopted through the L1, L2, and CX1 composition. BD1 is actually a full-bridge rectifier, the internal stress is 4 silicon diode. C1, C2, R1, D1 ~ D3 composition of passive power element correction circuit. PT4107 chip from your T1, D4, C4, R2 ~ R4 shaped just after the energy supply step-down regulator electronic filter, the filter input impedance is high, the output impedance is rather tiny, close to 300V DC substantial voltage after rectification from the step-down to the transistor PT4107 Vin of about eighteen ~ 20V voltage, to guarantee that chip inside the whole voltage assortment in balance.
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