ZHCSOB0A july 2021 – august 2023 LM5157
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Line Undervoltage Lockout (UVLO/SYNC/EN Pin)
- 8.3.2 High Voltage VCC Regulator (BIAS, VCC Pin)
- 8.3.3 Soft Start (SS Pin)
- 8.3.4 Switching Frequency (RT Pin)
- 8.3.5 Dual Random Spread Spectrum – DRSS (MODE Pin)
- 8.3.6 Clock Synchronization (UVLO/SYNC/EN Pin)
- 8.3.7 Current Sense and Slope Compensation
- 8.3.8 Current Limit and Minimum On Time
- 8.3.9 Feedback and Error Amplifier (FB, COMP Pin)
- 8.3.10 Power-Good Indicator (PGOOD Pin)
- 8.3.11 Hiccup Mode Overload Protection (MODE Pin)
- 8.3.12 Maximum Duty Cycle Limit and Minimum Input Supply Voltage
- 8.3.13 Internal MOSFET (SW Pin)
- 8.3.14 Overvoltage Protection (OVP)
- 8.3.15 Thermal Shutdown (TSD)
- 8.4 Device Functional Modes
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
7.6 Typical Characteristics
Figure 7-1 BIAS
Shutdown Current vs VBIAS
Figure 7-3 BIAS
Operating Current vs Temperature
Figure 7-5 VVCC vs
IVCC
Figure 7-7 EN
Threshold vs Temperature
Figure 7-9 FB
Reference vs Temperature
Figure 7-11 Frequency vs Temperature
Figure 7-13 Peak
Current Limit vs Duty Cycle
Figure 7-15 Minimum On Time vs Frequency
Figure 7-2 BIAS
Shutdown Current vs Temperature
Figure 7-4 VVCC vs VBIAS
Figure 7-6 ISS vs Temperature
Figure 7-8 UVLO
Threshold vs Temperature
Figure 7-10 Frequency vs RT Resistance
Figure 7-12 Current Limit Threshold vs Temperature
Figure 7-14 Internal MOSFET Drain Source On-state Resistance vs Temperature
Figure 7-16 Maximum Duty Cycle Limit vs Frequency