HM2711中文资料华之美半导体数据手册PDF规格书

description

HM2711 is a high-performance low-cost PWM control power device, suitable for Used in offline low-power step-down applications, with simple peripheral circuits Single, the number of devices is small. At the same time, the product has built-in high withstand voltage MOSFET It can improve the surge tolerance of the system. Different from the traditional PWM controller, there is no fixed time inside HM2711 The clock drives MOSFET, the system switching frequency changes with the load to be realistic It is adjusted automatically. At the same time, the chip adopts multi-mode PWM control Technology effectively simplifies the design of peripheral circuits and improves linear adjustment Rate and load adjustment rate and eliminate audible noise during system operation. In addition, the internal peak current detection threshold of the chip can follow the actual negative Automatic adjustment of load conditions can effectively reduce the waiting time under no-load conditions. Machine power consumption. HM2711 integrates a complete protection function with self-recovery function: VDD undervoltage protection, cycle-by-cycle current limit, output overvoltage protection, Overheating protection, overload protection and VDD overvoltage protection, etc.

Main features,

● Integrated 650V high voltage start circuit

● Multi-mode control, no abnormal sound work

● Support buck and buck-boost topologies

● Default 12V output (FB pin is floating)

● Standby power consumption is less than 50mW

● Good linear adjustment rate and load adjustment rate

● Integrated soft start circuit

● Internal protection function:

Overload protection (OLP)

Cycle-by-cycle current limit (OCP)

Output overvoltage protection (OVP)

VDD overvoltage, undervoltage and voltage clamp protection