SNVSBT4A
August 2023 – November 2023
LM5185-Q1
PRODUCTION DATA
1
1
Features
2
Applications
3
Description
4
Description (continued)
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Power MOSFET Gate Driver
7.3.2
PSR Flyback Modes of Operation
7.3.3
High Voltage VCC Regulator
7.3.4
Setting the Output Voltage
7.3.4.1
Diode Thermal Compensation
7.3.5
Control Loop Error Amplifier
7.3.6
Precision Enable
7.3.7
Configurable Soft Start
7.3.8
Minimum On-Time and Off-Time
7.3.9
Current Sensing and Overcurrent Protection
7.3.10
Thermal Shutdown
7.4
Device Functional Modes
7.4.1
Shutdown Mode
7.4.2
Standby Mode
7.4.3
Active Mode
8
Application and Implementation
8.1
Application Information
8.2
Typical Applications
8.2.1
Design 1: Wide VIN, Low IQ PSR Flyback Converter Rated at 16.4 V, 1 A
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.2.1
Custom Design With WEBENCH® Tools
8.2.1.2.2
Custom Design With Excel Quickstart Tool
8.2.1.2.3
Flyback Transformer T1 and Current-Sense Resistor (RCS)
8.2.1.2.4
Flyback Diode – DFLY
8.2.1.2.5
Leakage Inductance Clamp Circuit – DF, DCLAMP
8.2.1.2.6
Feedback Resistor – RFB
8.2.1.2.7
Thermal Compensation Resistor – RTC
8.2.1.2.8
UVLO Resistors – RUV1, RUV2
8.2.1.2.9
Soft-Start Capacitor – CSS
8.2.1.2.10
Compensation Components
8.2.1.3
Application Curves
8.3
Power Supply Recommendations
8.4
Layout
8.4.1
Layout Guidelines
8.4.2
Layout Examples
9
Device and Documentation Support
9.1
Device Support
9.1.1
Development Support
9.1.1.1
Custom Design With WEBENCH® Tools
9.2
Documentation Support
9.2.1
Related Documentation
9.3
Receiving Notification of Documentation Updates
9.4
Support Resources
9.5
Trademarks
9.6
Electrostatic Discharge Caution
9.7
Glossary
10
Revision History
11
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
PWP|14
MPDS370A
Thermal pad, mechanical data (Package|Pins)
PWP|14
PPTD022AA
Orderable Information
snvsbt4a_oa
snvsbt4a_pm
2
Applications
Automotive HEV/EV powertrain systems
On-board charger
Traction inverters
: IGBT and
SiC gate drivers
Sub-AM band
automotive body electronics
HVAC compressor
Interior heater module
Battery Management Systems (BMS)
Generic isolated bias power rails for industrial and telecom systems
Generic IGBT, MOSFET, GaN and SiC gate drivers