SLUSDX3C
november 2020 – august 2023
UCC25800-Q1
PRODUCTION DATA
1
1
Features
2
Applications
3
Description
4
Revision History
5
Device Comparison Table
6
Pin Configuration and Functions
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Power Management
8.3.2
Oscillator
8.3.3
External Synchronization
8.3.4
Dead-Time
8.3.4.1
Adaptive Dead-time
8.3.4.2
Maximum Programmable Dead-time
8.3.5
Protections
8.3.5.1
Overcurrent Protection
8.3.5.1.1
OCP Threshold Setting
8.3.5.1.2
Output Power Capability
8.3.5.2
Input Overvoltage Protection (OVP)
8.3.5.3
Over-Temperature Protection (TSD)
8.3.5.4
Pin-Fault Protections
8.3.5.5
VREG Pin Protection
8.3.6
DIS/FLT Pin operation
8.3.6.1
FAULT Codes
8.4
Device Functional Modes
8.4.1
UVLO Mode
8.4.2
Soft-start Mode
8.4.3
Normal Operation Mode
8.4.4
Disabled Mode
8.4.5
Fault Modes
9
Application and Implementation
9.1
Application Information
9.2
Typical Application
9.2.1
LLC Converter Operation Principle
9.2.2
Design Requirements
9.2.3
Detailed Design Procedure
9.2.4
Application Curves
9.3
What to Do and What Not to Do
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.2
Layout Example
12
Device and Documentation Support
12.1
Documentation Support
12.1.1
Related Documentation
12.2
Receiving Notification of Documentation Updates
12.3
Support Resources
12.4
Trademarks
12.5
Electrostatic Discharge Caution
12.6
Glossary
13
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
DGN|8
MPDS046F
Thermal pad, mechanical data (Package|Pins)
DGN|8
PPTD362A
Orderable Information
slusdx3c_oa
slusdx3c_pm
9.3
What to Do and What Not to Do
Do
Good decoupling between VCC and GND, minimize the loop of VCC-GND and the decoupling capacitor
Use transformer with split chamber bobbin to minimize the EMI noise coupling from the inverter power stage
The UCC25800-Q1 transformer driver can be used to drive single higher power transformer or multiple lower power transformer
Setting the OCP1 level according to the designed load
Use post regulator if the voltage regulation requirement can't be met
Add Zener clamp at output if the output load can be completely removed
If cost is acceptable, use NP0 or C0G type resonant capacitor, or use X7R with much higher voltage rating than needed
Sufficient copper area for thermal management if the ambient temperature is high or the power level is high
Not to Do
Long VCC-GND decoupling capacitor trace
Set up the OCP1 to the highest level for all designs