ZHCSPX4A February 2022 – April 2022 LM5152-Q1 , LM51521-Q1
PRODUCTION DATA
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 说明（续）
- 6 Device Comparison Table
- 7 Pin Configuration and Functions
- 8 Specifications
-
9 Detailed Description
- 9.1 Overview
- 9.2 Functional Block Diagram
- 9.3
Feature Description
- 9.3.1 Device Enable/Disable (EN, VH Pin)
- 9.3.2 High Voltage VCC Regulator (BIAS, VCC Pin)
- 9.3.3 Light Load Switching Mode Selection (MODE Pin)
- 9.3.4 Line Undervoltage Lockout (UVLO Pin)
- 9.3.5 Fast Restart Using VCC HOLD (VH Pin)
- 9.3.6 Adjustable Output Regulation Target (VOUT, TRK, VREF Pin)
- 9.3.7 Overvoltage Protection (VOUT Pin)
- 9.3.8 Boost Status Indicator (STATUS Pin)
- 9.3.9 Dynamically Programmable Switching Frequency (RT)
- 9.3.10 External Clock Synchronization (SYNC Pin)
- 9.3.11 Programmable Spread Spectrum (DITHER Pin)
- 9.3.12 Programmable Soft Start (SS Pin)
- 9.3.13 Wide Bandwidth Transconductance Error Amplifier and PWM (TRK, COMP Pin)
- 9.3.14 Current Sensing and Slope Compensation (CSP, CSN Pin)
- 9.3.15 Constant Peak Current Limit (CSP, CSN Pin)
- 9.3.16 Maximum Duty Cycle and Minimum Controllable On-Time Limits
- 9.3.17 Deep Sleep Mode and Bypass Operation (HO, CP Pin)
- 9.3.18 MOSFET Drivers, Integrated Boot Diode, and Hiccup Mode Fault Protection (LO, HO, HB Pin)
- 9.3.19 Thermal Shutdown Protection
- 9.4 Device Functional Modes
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
9.4.2 Light Load Switching Mode
The device provides three light load switching modes. Inductor current waveforms in each mode are different at the light or no load condition.
Figure 9-22 Inductor Current Waveform at Light Load (a)
FPWM (b) Diode Emulation (c) Skip Mode