User's Guide
SLUUB56A – July 2014 – Revised August 2014
UCC28880EVM-616 High-Side Buck Evaluation Module
1
Introduction
The UCC28880EVM-616 evaluation module is an offline high-voltage buck-type power supply that
provides 13 V
DC
at a maximum output of 100 mA. The input accepts a voltage range of 85 V
AC
to 265 V
AC
.
The evaluation module also has the option to deliver 5-V
DC
output using a simple jumper arrangement for
the purpose of quick demonstration (additional power-stage optimization needed for optimal 5-V output
performance).
The evaluation module uses the UCC28880 low quiescent current switcher device. This device integrates
a 700-V FET and controller into one SOIC7 package. The device also features a high-voltage current
source, enabling start-up and operation directly from the rectified mains voltage. The low quiescent current
of the device enables very high efficiency in non-isolated high-side buck low-power converters. Additional
features are low standby power and a minimum number of external components.
The PWM signal generation is based on a maximum constant ON time concept and each ON pulse is
followed by a minimum OFF time to ensure the power MOSFET is not continuously driven in the ON state.
The PWM signal is AND gated with the signal from a current limiter. The AND gated signal controls the
power MOSFET through a driver. Thereby no internal clock is required, and the switching of the power
MOSFET is load dependent. The device is also protected from failure conditions with thermal shutdown,
under-voltage lockout, soft start and overload protection.
2
Applications
The UCC28880 is suited for use in non-isolated off-line systems requiring high efficiency and advanced
fault protection features. Typical applications include:
•
Home Appliances
•
White Goods
•
E Metering
•
Home Automation
•
Infrastructure
•
LED Lighting
2
UCC28880EVM-616 High-Side Buck Evaluation Module
SLUUB56A – July 2014 – Revised August 2014
Copyright © 2014, Texas Instruments Incorporated