IP3101 provides a half-bridge drive system with simple and high-performance control functions, especially suitable for electronic ballasts. It integrates the basic functions of the half-bridge drive so that the drive system can be made as small as possible, with the least external components and the lowest power consumption. The built-in soft-start circuit does not require additional external components. The preheating frequency and preheating time of different lamps can be easily programmed and controlled by a capacitor (preheating frequency capacitor) and a resistor (preheating time resistor). The normal working frequency can also be easily achieved by adjusting the timing resistor (Rt) and the timing capacitor (Ct). The cold cathode current can be limited by changing the normal working frequency, that is, the soft-start frequency with an external small-signal transistor. Lamp shortage or other over-current protection can be achieved by adding an external small-signal transistor.
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