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FAN7310 Datasheet(PDF) 7 Page - Fairchild Semiconductor |
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FAN7310 Datasheet(HTML) 7 Page - Fairchild Semiconductor |
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7 / 10 page  FAN7310 7 Function Description UVLO : The under voltage lockout circuit guarantees stable operation of the IC’s control circuit by stopping and starting it as a function of the Vin value. The UVLO circuit turns on the control circuit when Vin exceeds 5V. When Vin is lower than 5V, the IC’s standby current is less than 200uA. ENA : Applying the voltage higer than 2V to ENA pin enables the operation of the IC. Applying to the voltage lower than 0.7V to ENA pin will disable the operation of the inverter. Soft start :The soft start function is provided that S_S pin is connected through a capacitor to GND. A soft start circuit ensures a gradual increase in the input and output power. The capacitor connected to S_S pin determines the rate of rise of the duty ratio. It is charged by a current source of 6uA. Main oscillator : Timing capacitor CT are charged by the reference current source, formed by the timing resistor Rt whose voltage is regulated at 1.25V. The sawtooth waveform charges up to 2V. Once reached, capacitors begin discharging down to 0.5V. Next timing capacitors start charging again and a new switching cycle begins. The main frequency can be programmed with adjusting the values of Rt and CT. The main fre- quency can be calculated as below. Burst oscillator & burst dimming :Timing capacitor BCT are charged by the reference current source, formed by the timing resistor Rt whose voltage is regu- lated at 1.25V. The sawtooth waveform charges up to 2V. Once reached, capacitors begin discharging down to 0.5V. Next timing capacitors start charging again and a new switching cycle begins. The burst dimming fre- quency can be programmed with adjusting the values of Rt and BCT. The burst dimming frequency can be calculated as below. The burst dimming frequency should be greater than 120Hz to avoid visible flicker. To compare the input of BDIM pin with the 0.5~2V trian- gular wave of burst oscillator makes the PWM pulse for burst dimming. The PWM pulse controls EA_OUT’s voltage by summing 85uA into EA_IN pin. f op = 19 32 R T C T ------------------------------- f burst = 3.75 64 R T BC T ----------------------------------- |
Similar Part No. - FAN7310 |
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Similar Description - FAN7310 |
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