IC manufacturers Texas Instruments

IC manufacturers (99)

Texas Instruments UCC28780 | Demoboard UCC28780EVM-002

High Frequency Active Clamp Flyback Controller

Overview

TopologyFlyback Converter
Input voltage90-265 V
Switching frequency1000 kHz
Output 120 V / 2.25 A
IC revisionRevised February 2018

Description

Using the UCC28780EVM-002 45-W 20-V HighDensity GaN Active-Clamp Flyback ConverterUCC28780 is a high-frequency active-clamp flyback controller that enables high-density AC-to-DC power supplies that comply with stringent global efficiency standards such as DoE Level VI and EU CoC V5 Tier-2. User programmable advanced control law features allow performance to be optimized for both Silicon (Si) and Gallium Nitride (GaN) power FETs. Direct operation with switching devices that combine driver and GaN FETs is further enhanced with logic-level gate signals and enable outputs.Zero voltage switching (ZVS) is achieved over a wide operating range with advanced auto-tuning techniques, adaptive dead-time optimization, and variable switching frequency control law. Using adaptive multimode control that changes the operation based on input and output conditions, UCC28780 enables high efficiency while mitigating audible noise. With a variable switching frequency of up to 1 MHz and accurate programmable over-power protection, which provides consistent power for thermal design across wide line range, the size of passive components can be further reduced and enable high power density.UCC28780 works with VDS-sensing synchronous rectifier controllers, such as UCC24612, to achieve higher conversion efficiency and very compact designs.

Features

  • Full and Partial Zero Voltage Switching (ZVS) of Primary FET with Adaptive Control
  • Programmable Timing for External Si or GaN FETs
  • High Switching Frequency up to 1MHz
  • Programmable Adaptive Burst Control and Standby Modefor Light-Load Efficiency with Low Output Ripple and Audible Noise Mitigation
  • Brownout Detection without Direct Line Sensing
  • Accurate Programmable Over-Power Protection (OPP) to Support Peak Power Mode
  • Fault Protections: Over-Temperature, Output Over-Voltage, Output Short-Circuit, Over-Current, and Pin Fault
  • Direct Interface with Optocoupler Based Feedback Allows for Dynamically Scalable Output Voltage
  • Internal Soft Start
  • NTC Thermistor Interface with External Enable

Typical applications

  • High-Density AC-to-DC Adapters for Notebook, Tablet, TV, Set-Top Box and Printer / USB Power Delivery, Direct and Fast Mobile / AC-to-DC or DC-to-DC Auxiliary Power Supply

Products

Order Code Data­sheet Simu­lation Downloads Status Product seriesApplicationCVR
(V (AC))
Safety ClassdV/dt
(V/µs)
DF @ 1 kHz
(%)
RISOOperating TemperaturePitch
(mm)
L
(mm)
W
(mm)
H
(mm)
PackagingL
(µH)
IR
(A)
ISAT
(A)
RDC max.
(Ω)
fres
(MHz)
Version Samples
890324022017CSSPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WCAP-FTX2 Film Capacitors Across the mains68 nF 275 X2 400 0.130 GΩ -40 °C up to +105 °C 7.5 10 6 12 Carton
7447462010SPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WE-TI Radial Leaded Wire Wound Inductor 6 6 8.5 1 8.5 8 0.015 140 Heat Shrinking Tube
7447462220SPEC
8 files Active i| Production is active. Expected lifetime: >10 years.WE-TI Radial Leaded Wire Wound Inductor 6 6 8.5 22 1.8 0.13 15 Heat Shrinking Tube
Order Code Data­sheet Simu­lation
890324022017CSSPEC
7447462010SPEC
7447462220SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Status Product seriesApplicationCVR
(V (AC))
Safety ClassdV/dt
(V/µs)
DF @ 1 kHz
(%)
RISOOperating TemperaturePitch
(mm)
L
(mm)
W
(mm)
H
(mm)
PackagingL
(µH)
IR
(A)
ISAT
(A)
RDC max.
(Ω)
fres
(MHz)
Version Samples