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UCC256304 Ultra Wide VIN LLC Resonant Controller Enabling Low Standby Power
SLUSD60
October 2017
UCC256304
PRODUCTION DATA.
CONTENTS
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UCC256304 Ultra Wide VIN LLC Resonant Controller Enabling Low Standby Power
1
Features
2
Applications
3
Description
4
Revision History
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
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Hybrid Hysteretic Control
7.3.2
Regulated 12-V Supply
7.3.3
Feedback Chain
7.3.4
Optocoupler Feedback Signal Input and Bias
7.3.5
System External Shut Down
7.3.6
Pick Lower Block and Soft Start Multiplexer
7.3.7
Pick Higher Block and Burst Mode Multiplexer
7.3.8
VCR Comparators
7.3.9
Resonant Capacitor Voltage Sensing
7.3.10
Resonant Current Sensing
7.3.11
Bulk Voltage Sensing
7.3.12
Output Voltage Sensing
7.3.13
High Voltage Gate Driver
7.3.14
Protections
7.3.14.1
ZCS Region Prevention
7.3.14.2
Over Current Protection (OCP)
7.3.14.3
Over Output Voltage Protection (VOUTOVP)
7.3.14.4
Over Input Voltage Protection (VINOVP)
7.3.14.5
Under Input Voltage Protection (VINUVP)
7.3.14.6
Boot UVLO
7.3.14.7
RVCC UVLO
7.3.14.8
Over Temperature Protection (OTP)
7.4
Device Functional Modes
7.4.1
Burst Mode Control
7.4.2
High Voltage Start-Up
7.4.3
X-Capacitor Discharge
7.4.4
Soft-Start and Burst-Mode Threshold
7.4.5
System States and Faults State Machine
7.4.6
Waveform Generator State Machine
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Custom Design With WEBENCH® Tools
8.2.2.2
LLC Power Stage Requirements
8.2.2.3
LLC Gain Range
8.2.2.4
Select Ln and Qe
8.2.2.5
Determine Equivalent Load Resistance
8.2.2.6
Determine Component Parameters for LLC Resonant Circuit
8.2.2.7
LLC Primary-Side Currents
8.2.2.8
LLC Secondary-Side Currents
8.2.2.9
LLC Transformer
8.2.2.10
LLC Resonant Inductor
8.2.2.11
LLC Resonant Capacitor
8.2.2.12
LLC Primary-Side MOSFETs
8.2.2.13
Design Considerations for Adaptive Dead-Time
8.2.2.14
LLC Rectifier Diodes
8.2.2.15
LLC Output Capacitors
8.2.2.16
HV Pin Series Resistors
8.2.2.17
BLK Pin Voltage Divider
8.2.2.18
BW Pin Voltage Divider
8.2.2.19
ISNS Pin Differentiator
8.2.2.20
VCR Pin Capacitor Divider
8.2.2.21
Burst Mode Programming
8.2.2.22
Soft-Start Capacitor
8.2.3
Application Curves
9
Power Supply Recommendations
9.1
VCC Pin Capacitor
9.2
Boot Capacitor
9.3
RVCC Pin Capacitor
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Device Support
11.1.1
Development Support
11.1.1.1
Custom Design With WEBENCH® Tools
11.2
Documentation Support (if applicable)
11.2.1
Related Documentation
11.3
Receiving Notification of Documentation Updates
11.4
Community Resources
11.5
Trademarks
11.6
Electrostatic Discharge Caution
11.7
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
DDB|14
MPDC008
Thermal pad, mechanical data (Package|Pins)
Orderable Information
slusd60_oa
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