GENERAL DESCRIPTION
PWM switching frequency at normal operation is frequency shuffling technique together with soft switching control at the totem pole gate drive output. Consequently, audio noise erformance is greatly improved. externally programmable and trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved. VDD low startup current and low operating IP current contribute to a reliable power on startup design with HT2269. A large value resistor could thus be used in the startup circuit to minimize the standby power. The internal slope compensation improves H system large signal stability and reduces the possible sub-harmonic oscillation at high PWM duty cycle output. Leading-edge blanking on current sense input removes the signal glitch due to C snubber circuit diode reverse recovery. This greatly helps to reduce the external component count and system cost in application.
HOTCHIP
