OnSemi NPC1337 60W適配器設計方案

發布時間:2013/1/14 17:23:59 訪問次數:6555

ncp1337主要特性：

51電子網公益庫存:: C001; C0114E; C0308G-MC012; C0308G-MC016; C0524; C1000; C1008; C1008B; C109; C1093; C1099G; C10T40; C1100G

• free−running borderline/critical mode quasi−resonant operation
• current−mode
• soft−skip mode with minimum switching frequency for standby
• auto−recovery short−circuit protection independent of auxiliary voltage
• overvoltage protection
• brown−out protection
• two externally triggerable fault comparators (one for a disable function, and the other for a permanent latch)
• internal 4.0 ms soft−start
• 500 ma peak current drive sink capability
• 130 khz max frequency
• internal leading edge blanking
• internal temperature shutdown
• direct optocoupler connection
• dynamic self−supply with levels of 12 v (on) and 10 v (off)
• spice models available for transient and ac analysis
• these are pb−free devices*

ncp1337應用：
• ac−dc adapters for notebooks, etc.
• offline battery chargers
• consumer electronics (dvd players, set−top boxes, tvs, etc.)
• auxiliary power supplies (usb, appliances, tvs, etc.)

圖1. ncp1337內部方框圖

ncp1337adapgevb方案介紹：

this design using ncp1337 offers a perfect solution for portable dvd, lcd tv, or monitor and notebook adapter applications. this adapter provides effective protection functions such as over-load protection, over-voltage protection, shortcircuit protection and brown-out protection. thanks to the quasi-resonant operation and synchronous rectifier, this adapter has high efficiency and improved emi performance. the standby consumption is lower because of the cycle skipping and soft ripple mode.

ncp1337adapgevb方案原理圖：

圖2. ncp1337adapgevb方案原理圖

ncp1562-100wgevb方案材料清單：

pcb元件布局圖：

onsemi公司的ncp1337是一款結合電流模式調節器和退磁檢測器的芯片，以充分確保邊界線/臨界傳導模式在任何負載/傳輸線條件連同最低漏電壓開關（準-諧振操作）。因為soxyless概念，變壓器鐵心重置檢測在內部完成，沒有使用任何外部信號。根據cispr-22 emi限制標準，內部頻率被限制于130khz，防止控制器操作達到150khz。該芯片具有過載保護重啟功能，一旦過載，設備會自動重啟恢復。主要介紹ncp1337芯片、芯片特性、應用方向及內部結構圖。本文介紹了采用ncp1337芯片作為主芯片的60w參考設計方案，給出該方案的介紹、方案原理圖、pcb制板圖及元器件清單列表。