SNVSB95 July   2019 LM3421-Q1 , LM3423-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Boost Application
  4. 4 Revision History
  5. 5 Device Comparison
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Current Regulators
      2. 8.3.2  Predictive Off-Time (PRO) Control
      3. 8.3.3  Average LED Current
      4. 8.3.4  Analog Dimming
      5. 8.3.5  Current Sense and Current Limit
      6. 8.3.6  Overcurrent Protection
      7. 8.3.7  Zero Current Shutdown
      8. 8.3.8  Control Loop Compensation
      9. 8.3.9  Start-Up Regulator
      10. 8.3.10 Overvoltage Lockout (OVLO)
      11. 8.3.11 Input Undervoltage Lockout (UVLO)
        1. 8.3.11.1 UVLO Only
        2. 8.3.11.2 PWM Dimming and UVLO
      12. 8.3.12 PWM Dimming
      13. 8.3.13 LM3423-Q1 Only: DPOL, FLT, TIMR, and LRDY
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 Inductor
      2. 9.1.2 LED Dynamic Resistance
      3. 9.1.3 Output Capacitor
      4. 9.1.4 Input Capacitors
      5. 9.1.5 Main MOSFET / Dimming MOSFET
      6. 9.1.6 Re-Circulating Diode
      7. 9.1.7 Boost Inrush Current
      8. 9.1.8 Switching Frequency
    2. 9.2 Typical Applications
      1. 9.2.1 Basic Topology Schematics
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1  Operating Point
          2. 9.2.1.2.2  Switching Frequency
          3. 9.2.1.2.3  Average LED Current
          4. 9.2.1.2.4  Inductor Ripple Current
          5. 9.2.1.2.5  LED Ripple Current
          6. 9.2.1.2.6  Peak Current Limit
          7. 9.2.1.2.7  Loop Compensation
          8. 9.2.1.2.8  Input Capacitance
          9. 9.2.1.2.9  N-channel FET
            1. 9.2.1.2.9.1 Boost and Buck-Boost
          10. 9.2.1.2.10 Diode
          11. 9.2.1.2.11 Output OVLO
          12. 9.2.1.2.12 Input UVLO
          13. 9.2.1.2.13 PWM Dimming Method
          14. 9.2.1.2.14 Analog Dimming Method
      2. 9.2.2 LM3421 Buck-Boost Application
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1  Operating Point
          2. 9.2.2.2.2  Switching Frequency
          3. 9.2.2.2.3  Average LED Current
          4. 9.2.2.2.4  Inductor Ripple Current
          5. 9.2.2.2.5  Output Capacitance
          6. 9.2.2.2.6  Peak Current Limit
          7. 9.2.2.2.7  Loop Compensation
          8. 9.2.2.2.8  Input Capacitance
          9. 9.2.2.2.9  N-channel FET
          10. 9.2.2.2.10 Diode
          11. 9.2.2.2.11 Input UVLO
          12. 9.2.2.2.12 Output OVLO
        3. 9.2.2.3 Application Curve
      3. 9.2.3 LM3421-Q1 BOOST Application
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
      4. 9.2.4 LM3421-Q1 Buck-Boost Application
        1. 9.2.4.1 Design Requirements
        2. 9.2.4.2 Detailed Design Procedure
      5. 9.2.5 LM3423-Q1 Boost Application
        1. 9.2.5.1 Design Requirements
        2. 9.2.5.2 Detailed Design Procedure
      6. 9.2.6 LM3421 Buck-Boost Application
        1. 9.2.6.1 Design Requirements
        2. 9.2.6.2 Detailed Design Procedure
      7. 9.2.7 LM3423 Buck Application
        1. 9.2.7.1 Design Requirements
        2. 9.2.7.2 Detailed Design Procedure
      8. 9.2.8 LM3423 Buck-Boost Application
        1. 9.2.8.1 Design Requirements
        2. 9.2.8.2 Detailed Design Procedure
      9. 9.2.9 LM3421 SEPIC Application
        1. 9.2.9.1 Design Procedure
        2. 9.2.9.2 Detailed Design Procedure
  10. 10Power Supply Recommendations
    1. 10.1 General Recommendations
    2. 10.2 Input Supply Current Limit
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Related Links
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

9.2.5.2 Detailed Design Procedure

Table 5. Bill of Materials

QTY PART ID PART VALUE MANUFACTURER PART NUMBER
1 LM3423 Boost controller TI LM3423MH
1 CBYP 2.2-µF X7R 10% 16 V MURATA GRM21BR71C225KA12L
1 CCMP 1-µF X7R 10% 25 V MURATA GRM21BR71E105KA01L
1 CFS 0.1-µF X7R 10% 25 V MURATA GRM21BR71E104KA01L
4 CIN 4.7-µF X7R 10% 100 V TDK C5750X7R2A475K
4 CO 10-µF X7R 10% 50 V TDK C4532X7R1H106K
1 COV 47-pF COG/NPO 5% 50 V AVX 08055A470JAT2A
1 CT 1000-pF COG/NPO 5% 50 V MURATA GRM2165C1H102JA01D
2 D1, D2 Schottky 60 V 5 A COMCHIP CDBC560-G
1 D3 Zener 10 V 500 mA ON-SEMI BZX84C10LT1G
1 L1 47 µH 20% 5.3 A COILCRAFT MSS1278-473MLB
1 Q1 NMOS 60 V 8 A VISHAY SI4436DY
1 Q2 PMOS 70 V 5.7 A ZETEX ZXMP7A17K
1 Q3 NMOS 60 V 260 mA ON-SEMI 2N7002ET1G
1 Q4, Q5 (dual pack) Dual PNP 40 V 200 mA FAIRCHILD FFB3906
1 Q6 NPN 300 V 600 mA FAIRCHILD MMBTA42
1 Q7 NPN 40 V 200 mA FAIRCHILD MMBT3904
1 RADJ 100-kΩ potentiometer BOURNS 3352P-1-104
1 RBIAS2 17.4 kΩ 1% VISHAY CRCW080517K4FKEA
2 RCSH, ROV1 12.4 kΩ 1% VISHAY CRCW080512K4FKEA
1 RFS 10 Ω 1% VISHAY CRCW080510R0FKEA
3 RHSP, RHSN, RMAX 1 kΩ 1% VISHAY CRCW08051K00FKEA
1 RLIM 0.06 Ω 1% 1W VISHAY WSL2512R0600FEA
1 ROV2 499 kΩ 1% VISHAY CRCW0805499KFKEA
1 RSNS 0.15 Ω 1% 1W VISHAY WSL2512R1500FEA
1 RT 35.7 kΩ 1% VISHAY CRCW080535K7FKEA
1 RUV1 1.43 kΩ 1% VISHAY CRCW08051K43FKEA
1 RUV2 10 kΩ 1% VISHAY CRCW080510K0FKEA
1 RUVH 16.9 kΩ 1% VISHAY CRCW080516K9FKEA
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