SLUSD60 October 2017 UCC256304
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
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
- 7.4 Device Functional Modes
-
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
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
- DDB|14
Thermal pad, mechanical data (Package|Pins)
Orderable Information
1 Features
- Hybrid Hysteretic Control (HHC)
- Best-in-Class Transient Response
- Easy Compensation Design
- Optimized Low Power Features Enable 75 mW
Standby Power Design with PFC on- Advanced Burst Mode
Opto-Coupler Low Power Operation - Helps Enable Compliance to CoC Tier II Standard
- Advanced Burst Mode
- Fast Exit from Burst Mode
- Improved Capacitive Region Avoidance Scheme
- Adaptive Dead-Time
- Internal High-Side Gate Drivers
(0.6-A and 1.2-A Capability) - Robust Soft Start with No Hard Switching
- Over Temperature, Output Over Voltage, Input
Over and Under Voltage Protection with
Three Levels of Over Current Protections - Wide Operating Frequency Range
(35 kHz to 1 MHz) - Nemko Certification for X Cap Discharge Function
- Wide DC Input Range
- Enables Wide AC Input Range
- PFC Startup Not Required For LLC Startup
- Create a Custom Design Using the UCC256304 With the WEBENCH® Power Designer
2 Applications
- Digital TV SMPS
- AC-DC Adapter
- Multi-Functional Printers
- Projectors
- Merchant DC-to-DC
- High Power Battery Charging
- DIN Rail Power Supply
- Multi-Axis Servo
- ATX Power Supply
- Appliances
- LED Lighting Applications
3 Description
The UCC256304 is a fully featured LLC controller with integrated high-voltage gate driver. It has been designed to pair with a PFC stage to provide a complete power system using a minimum of external components. The resulting power system is designed to meet the most stringent requirements for standby power without the need for a separate standby power converter.UCC256304 uses hybrid hysteretic control to provide best in class line and load transient response. The control makes the open loop transfer function a first order system so that it’s very easy to compensate and is always stable with proper frequency compensation.
The UCC256304 is unique in that the controller is able to operate over a large DC input range. This is accomplished by making the input overvoltage sense threshold much larger than the input voltage start threshold. This allows the LLC to startup and enter a low power standby mode without the need to enable the PFC and enables the LLC to accommodate an extensive range of common AC inputs.
UCC256304 provides a highly efficient burst mode with consistent burst power level during each burst on cycle. The burst power level is programmable and adaptively changes with input voltage.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| UCC256304 | SOIC (14) | 9.9 mm x 3.9 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
Simplified Schematic
4 Revision History
| DATE | REVISION | NOTES |
|---|---|---|
| October 2017 | * | Initial release. |