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DESCRIPTION：

 

The SCT82A34 is a 100V voltage mode control synchronous buck controller with line feed forward. 40ns minimum on-time of controlled high side MOSFET supports high conversion ratio, enabling the direct stepdown conversion from a 48V input to low-voltage rail reducing system complexity and solution cost. The device operates at nearly 100% duty cycle if needed during input voltage drops as low as 5.5V. The SCT82A34 support Forced-PWM (FPWM) and Diode Emulation Mode. FPWM operation eliminates switching frequency variation to minimize EMI, while user selectable diode emulation lowers current consumption at light-load condition. The adjustable switching frequency as high as 1.2MHz can be synchronized to an external clock source to eliminate beat frequencies in noise sensitive applications. An external voltage or the output of the buck converter itself source can power internal VCC or EXTVCC helping to increase overall efficiency and decrease internal self-heating from power dissipated in the internal VCC LDO even with 5V output voltage. The SCT82A34 features additional features for flexible and robust design including a configurable soft start, an open-drain power-good monitor for fault reporting and output monitoring, monotonic start-up into pre-biased loads, integrated VCC bias supply regulator and bootstrap diode, external power supply tracking, precision enable input with hysteresis for adjustable line under voltage lockout (UVLO), hiccup-mode overload protection, and thermal shutdown protection with automatic recovery. The device is available in a low-profile package DFN3.5X4.5-20L with enhanced thermal power pad.

 

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