SLUAAJ7 June   2022 UCC256402 , UCC256403 , UCC256404

 

  1.   Abstract
  2.   Trademarks
  3. 1UCC25640x Selection Guide
  4. 2UCC25640x Features Brief Overview
    1. 2.1 High Voltage(HV) Startup
      1. 2.1.1 HV Startup Procedure
      2. 2.1.2 HV Startup with External Bias
      3. 2.1.3 HV Start-up, VCC, X-cap Discharge Internal Block Diagram
      4. 2.1.4 HV Startup External Resistor
    2. 2.2 XCAP Discharge
      1. 2.2.1 IEC Standards
      2. 2.2.2 Detecting AC presence
      3. 2.2.3 Test Current Injection for Zero Crossing Detection
      4. 2.2.4 Typical Waveforms of HV Startup and XCAP Discharge
    3. 2.3 Feedback Chain
      1. 2.3.1 FBreplica Generation
      2. 2.3.2 Vcomp Signal and Threshold Voltages
      3. 2.3.3 FB Pin Voltage Typical Waveform at no Load
    4. 2.4 Hybrid Hysteretic Control and VCR Pin Voltage and Gate Pulse Generation
      1. 2.4.1 Hybrid Hysteretic Control
      2. 2.4.2 VCR Pin Voltage
      3. 2.4.3 VCR Typical Waveform
    5. 2.5 Soft Start
      1. 2.5.1 Soft Start Timing
      2. 2.5.2 Soft Start Initial Voltage Programming
    6. 2.6 Burst Mode
      1. 2.6.1 Burst Patterns
      2. 2.6.2 BMTL/BMTH Ratio Programming
      3. 2.6.3 BMTH Generation
      4. 2.6.4 Interpreting BMTL and BMTH
      5. 2.6.5 Soft On or Off
      6. 2.6.6 Operation when Burst Mode Disabled
      7. 2.6.7 Typical Waveforms
    7. 2.7 Adaptive Dead Time Control
    8. 2.8 Fault Management
      1. 2.8.1 OCP Protection
      2. 2.8.2 OCP Fault Typical Waveforms
      3. 2.8.3 Over Voltage Protection using Bias Winding (BW OVP)
      4. 2.8.4 Restart or Latch
    9. 2.9 ZCS Region Prevention Scheme
      1. 2.9.1 ZCS Effects
      2. 2.9.2 ZCS Detection and Prevention and Disabling
  5. 3UCC25640x Power Up Guidelines and Debugging Notes
    1. 3.1  Power Up Procedure
    2. 3.2  HV Pin
    3. 3.3  VCC Pin
    4. 3.4  BLK Pin
    5. 3.5  FB Pin
    6. 3.6  ISNS Pin
    7. 3.7  VCR Pin
    8. 3.8  BW Pin
    9. 3.9  LL/SS Pin
    10. 3.10 LO Pin
    11. 3.11 RVCC Pin
    12. 3.12 HS, HO, HB Pins
  6. 4References

2.3.3 FB Pin Voltage Typical Waveform at no Load

Figure 2-15 shows the FB pin voltage during no load. Here we can see that FB pin voltage is close to 5.6 V whenever FB pin current value is smaller than the sum of IFB current source and the clamp current source. Otherwise it is at zero.

GUID-20220526-SS0I-4S6J-1LPW-5FDBPK8CQMFZ-low.png Figure 2-15 Ch1- LO, Ch2-FB, Ch3- (HO-HS), Ch4-Iout
千亿体育app官网登录(中国)官方网站IOS/安卓通用版/手机APP | 米乐app下载官网（中国）|ios|Android/通用版APP最新版 | 米乐|米乐·M6（中国大陆）官方网站 | 千亿体育登陆地址 | 华体会体育（中国）HTH·官方网站 | 千赢qy国际_全站最新版千赢qy国际V6.2.14安卓/IOS下载 | 18新利网v1.2.5|中国官方网站 | bob电竞真人（中国官网）安卓/ios苹果/电脑版【1.97.95版下载】 | 千亿体育app官方下载(中国)官方网站IOS/安卓/手机APP下载安装 |