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基于LM5023的AC-DC 准谐振电流模式 PWM 控制器

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发表于 2018-11-27 17:00:03 | 显示全部楼层 |阅读模式
基于LM5023AC-DC 准谐振电流模式 PWM 控制器
  1 Features
  Critical Conduction Mode
  Peak-Current Mode Control
  Skip-Cycle Mode for Low-Standby Power
  Hiccup Mode for Continuous Overload Protection
  Cycle-by-Cycle Overcurrent Protection Maintains Accuracy Over the Universal AC Line
  Line-Voltage Feedforward
  OVP Protection by Sensing the Auxiliary Winding
  Integrated 0.7-A Peak Gate Driver
  Direct Opto-Coupler Interface
  Leading Edge Blanking of Current Sense Signal
  Maximum Frequency Clamp 130 kHz
  Programmable Soft-Start
  Thermal Shutdown
  8-Pin VSSOP Package
  Create a Custom Design using the LM5023 with the WEBENCH Power Designer
  2 Applications
  Universal Input AC-to-DC Notebook Adapters from 10 W to 65 W
  High-Efficiency Housekeeping and Auxiliary Power Supplies
  Battery Chargers
  Consumer Electronics (DVD Players, Set-Top Boxes, DTV, Gaming, Printers)
  3 Description
  The LM5023 is a quasi-resonant pulse width modulated (PWM) controller which contains all of the features needed to implement a highly efficient off-line power supply. The LM5023 uses the transformer auxiliary winding for demagnetization detection to ensure critical conduction mode (CrCM) operation. The LM5023 features a hiccup mode for overcurrent protection with an auto restart to reduce the stress on the power components during an overload. A skip-cycle mode reduces power consumption at light loads for energy conservation applications (ENERGY STAR®, CEPCP, and so forth). The LM5023 also uses the transformer auxiliary winding for output overvoltage protection (OVP); if an OVP fault is detected the LM5023 latches off the controller.
  The LM5023 is a quasi-resonant PWM controller which contains all of the features needed to implement a highly efficient off-line power supply. The LM5023 uses the transformer auxiliary winding for demagnetization detection to ensure quasi-resonant operation (valley-switching) to minimize switching losses. For applications that need to meet the ENERGY STAR low standby power requirements, the LM5023 features an extremely low lq current (346 µA) and skip-cycle mode which reduces power consumption at light loads. The LM5023 uses a feedback signal from the output to provide a very accurate output-voltage regulation <1%. To reduce overheating and stress during a sustained overload conditions the LM5023 offers a hiccup mode for over-current protection and provides a current-limit restart timer to disable the outputs and forcing a delayed restart (hiccup mode).
For offline start-up, an external depletion mode N-channel MOSFET can be used. This method is recommended for applications where a very low standby power (<50 mW) is required. For application where a low standby power is not as critical, an enhancement mode, N-channel MOSFET can be used. If an OV is detected on the auxiliary winding (QR pin), the device permanently latches off, requiring recycling of power to restart. VCC voltage must be brought lower than VRST to reset the latch. Additional features include line-current feedforward, pulse-by-pulse current limit, and a maximum frequency clamp of 130 kHz.
TI产品现货库存在线购买:https://www.iczoom.com/brand/509-c-1-20.html
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