ZHCSI00D April 2018 – September 2020 LMR36015
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
-
10Application and Implementation
- 10.1 Application Information
- 10.2
Typical Application
- 10.2.1
Design 1: Low Power 24-V, 1.5-A PFM Converter
- 10.2.1.1 Design Requirements
- 10.2.1.2
Detailed Design Procedure
- 10.2.1.2.1 Custom Design With WEBENCH Tools
- 10.2.1.2.2 Choosing the Switching Frequency
- 10.2.1.2.3 Setting the Output Voltage
- 10.2.1.2.4 Inductor Selection
- 10.2.1.2.5 Output Capacitor Selection
- 10.2.1.2.6 Input Capacitor Selection
- 10.2.1.2.7 CBOOT
- 10.2.1.2.8 VCC
- 10.2.1.2.9 CFF Selection
- 10.2.1.2.10 Maximum Ambient Temperature
- 10.2.2 Application Curves
- 10.2.3 Design 2: High Density 24-V, 1.5-A FPWM Converter
- 10.2.1
Design 1: Low Power 24-V, 1.5-A PFM Converter
- 10.3 What to Do and What Not to Do
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
9.1 Overview
The LMR36015 is a synchronous peak-current-mode buck regulator designed for a wide variety of industrial applications. The regulator automatically switches modes between PFM and PWM, depending on load. At heavy loads, the device operates in PWM at a constant switching frequency. At light loads, the mode changes to PFMW with diode emulation allowing DCM. This reduces the input supply current and keeps efficiency high. The device features internal loop compensation which reduces design time and requires fewer external components than externally compensated regulators.
The LMR36015 is designed with a flip-chip or HotRod technology, greatly reducing the parasitic inductance of pins. In addition, the layout of the device allows for reduction in the radiated noise generated by the switching action through partial cancellation of the current generated magnetic field. As a result the switch-node waveform exhibits less overshoot and ringing.
Figure 9-1 Switch Node Waveform