Texas Instruments UCC28610EVM-474 - 25-W Universal Off-Line Flyback Converter Evaluation Module UCC28610EVM-474 UCC28610EVM-474 데이터 시트
제품 코드
UCC28610EVM-474
User
'
s Guide
SLUU383C
–
November 2009
–
Revised June 2011
UCC28610EVM-474 25-W Universal Off-Line Flyback
Converter
1
Introduction
The UCC28610EVM-474 evaluation module is a 25-W off-line Discontinuous Mode (DCM) flyback
converter providing 12 V at 2.1-A maximum load current, operating from a universal AC input. The module
is controlled with the UCC28610 Green-Mode Flyback Controller which uses a cascoded architecture that
allows fully integrated current control without an external sense resistor. The converter maintains
discontinuous mode operation over the entire operating range. This innovative approach results in
efficiency, reliability, and system cost improvements over a conventional flyback.
converter providing 12 V at 2.1-A maximum load current, operating from a universal AC input. The module
is controlled with the UCC28610 Green-Mode Flyback Controller which uses a cascoded architecture that
allows fully integrated current control without an external sense resistor. The converter maintains
discontinuous mode operation over the entire operating range. This innovative approach results in
efficiency, reliability, and system cost improvements over a conventional flyback.
2
Description
This evaluation module uses the UCC28610 Green-Mode Flyback Controller (
) in a 25-W DCM flyback converter that exceeds Energy Star
™
EPS version 2.0 for efficiency
during active load and no-load power consumption. The input accepts a voltage range of 85 V
AC
to 265
V
AC
. The output provides a regulated output voltage of 12 V
DC
at a load current of up to 2.1 A. The
converter will transition through three operating modes: green mode (GM), amplitude modulation (AM),
and frequency modulation (FM), depending upon the power level and FB current. In FM mode, the on-time
is fixed, resulting in a fixed peak primary current at each cycle, and the switching frequency is increased
with increasing load. In AM mode, the switching frequency is fixed at 30 kHz and the peak primary current
is modulated with the on-time as with any typical PWM controller. Green mode operation at light load
consists of burst packets of 30-kHz pulses with a fixed on-time and peak primary currents of 33% of the
maximum programmed level. Low system parts count and built in advanced protection features result in a
cost-effective solution that meets stringent world-wide energy efficiency requirements.
and frequency modulation (FM), depending upon the power level and FB current. In FM mode, the on-time
is fixed, resulting in a fixed peak primary current at each cycle, and the switching frequency is increased
with increasing load. In AM mode, the switching frequency is fixed at 30 kHz and the peak primary current
is modulated with the on-time as with any typical PWM controller. Green mode operation at light load
consists of burst packets of 30-kHz pulses with a fixed on-time and peak primary currents of 33% of the
maximum programmed level. Low system parts count and built in advanced protection features result in a
cost-effective solution that meets stringent world-wide energy efficiency requirements.
This user
’
s guide provides the schematic, component list, assembly drawing, art work, and test set up
necessary to evaluate the UCC28610 in a typical off-line converter application.
3
SLUU383C
–
November 2009
–
Revised June 2011
UCC28610EVM-474 25-W Universal Off-Line Flyback Converter
Copyright
©
2009
–
2011, Texas Instruments Incorporated