SLUSEW0
December 2023
UCC28750
PRODUCTION DATA
1
1
Features
2
Applications
3
Description
4
Device Comparison
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
Switching Characteristics
6.7
Timing Requirements
6.8
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Detailed Pin Descriptions
7.3.1
VDD - Input Bias
7.3.2
DRV - Gate Drive Out
7.3.3
CS - Current Sensing
7.3.4
FB - Feedback
7.3.5
FLT - Fault
7.3.6
GND - Ground Return
7.4
Feature Description
7.4.1
Soft Start
7.4.2
Control Law
7.4.3
Frequency Dithering
7.4.4
Fault Protections
7.4.4.1
VDD Overvoltage and Undervoltage Lockout
7.4.4.2
Internal Overtemperature Protection
7.4.4.3
Output Overpower Protection
7.4.4.4
Output Short-Circuit Protection
7.4.4.5
FLT Pin Protections
7.4.5
Slope Compensation
7.5
Device Functional Modes
7.5.1
Off
7.5.2
Startup
7.5.3
On
7.5.4
Fault
7.5.5
Disabled
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Application
8.2.2
Design Requirements
8.2.3
Detailed Design Procedure
8.2.3.1
Input Bulk Capacitance with Minimum Bulk Voltage
8.2.3.2
Transformer Turns Ratio and Inductance
8.2.3.3
Current Sense and Slope Compensation Network
8.2.3.4
Output Capacitors
8.2.3.5
VDD Capacitance, CVDD
8.2.4
Application Performance Plots
8.2.4.1
Startup
8.2.4.2
Load Transients
8.2.4.3
Q1 Drain Voltage Evaluation
8.2.5
What to Do and What Not to Do
8.3
Power Supply Recommendations
8.4
Layout
8.4.1
Layout Guidelines
8.4.2
Layout Example
9
Device and Documentation Support
9.1
Documentation Support
9.1.1
Related Documentation
9.2
Receiving Notification of Documentation Updates
9.3
Support Resources
9.4
Trademarks
9.5
Electrostatic Discharge Caution
9.6
Glossary
10
Revision History
11
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
DBV|6
MPDS026Q
Thermal pad, mechanical data (Package|Pins)
Orderable Information
slusew0_oa
slusew0_pm
1
Features
Stable continuous conduction mode (CCM) operation with internal slope compensation
Fixed-frequency operation of 65kHz or 100kHz
Secondary-side regulation (SSR) with opto-coupler
Frequency foldback and burst mode for improved light-load efficiency
Frequency dithering for improved EMI performance
Gate source/sink capability: 300mA/500mA
Internal 4ms soft-start
Robust protection features:
Over-voltage and Under-voltage lockout
Output over-power protection (OPP)
Output short-circuit (OSC) protection
Output over-voltage (OVP) protection
Cycle-by-cycle peak over-current limit
External over-temperature, over-voltage protection (OTP, OVP) and brownout detection on FLT pin
Internal thermal shutdown