ZHCSSC1B June   2015  – December 2024 LV14240

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics
    7. 5.7 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Fixed Frequency Peak Current Mode Control
      2. 6.3.2  Slope Compensation
      3. 6.3.3  Low Dropout Operation and Bootstrap Voltage (BOOT)
      4. 6.3.4  Adjustable Output Voltage
      5. 6.3.5  Enable and Adjustable Undervoltage Lockout
      6. 6.3.6  External Soft Start
      7. 6.3.7  Switching Frequency and Synchronization (RT/SYNC)
      8. 6.3.8  Overcurrent and Short-Circuit Protection
      9. 6.3.9  Overvoltage Protection
      10. 6.3.10 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Pulse Skipping Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Output Voltage Set-Point
        2. 7.2.2.2 Switching Frequency
        3. 7.2.2.3 Output Inductor Selection
        4. 7.2.2.4 Output Capacitor Selection
        5. 7.2.2.5 Schottky Diode Selection
        6. 7.2.2.6 Input Capacitor Selection
        7. 7.2.2.7 Bootstrap Capacitor Selection
        8. 7.2.2.8 Soft-Start Capacitor Selection
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 接收文档更新通知
    2. 8.2 支持资源
    3. 8.3 Trademarks
    4. 8.4 静电放电警告
    5. 8.5 术语表
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

5.5 Electrical Characteristics

Limits apply over the recommended operating junction temperature (TJ) range of –40°C to +125°C, unless otherwise stated. Minimum and Maximum limits are specified through test, design or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise specified, the following conditions apply: VIN = 4 V to 40 V.
PARAMETERTEST CONDITIONMINTYPMAXUNIT
POWER SUPPLY (VIN PIN)
VINOperation input voltage440V
UVLOUnder voltage lockout thresholdsRising threshold3.53.73.9V
Hysteresis285mV
ISHDNShutdown supply currentVEN = 0 V, TA = 25°C, 4 V ≤ VIN ≤ 40 V13μA
IQOperating quiescent current (non- switching)VFB = 1 V, TA = 25°C300μA
ENABLE (EN PIN)
VEN_THEN Threshold Voltage1.051.201.38V
IEN_PINEN PIN currentEnable threshold +50 mV–4.6μA
Enable threshold –50 mV–1.0
IEN_HYSEN hysteresis current–3.6μA
EXTERNAL SOFT-START
ISSSS pin currentTA = 25°C3μA
VOLTAGE REFERENCE (FB PIN)
VFBFeedback voltageTJ = 25°C0.7440.7500.756V
TJ = –40°C to 125°C0.7350.7500.765V
HIGH-SIDE MOSFET
RDS_ONOn-resistanceVIN = 12 V100180mΩ
High-side MOSFET CURRENT LIMIT
ILIMTCurrent limitVIN = 12 V, TA = 25°C, Open Loop2.53.23.8A
THERMAL PERFORMANCE
TSHDNThermal shutdown threshold170°C
THYSHysteresis12