UCC28700, UCC28701

UCC28702, UCC28703

www.ti.com

SLUSB41 – JULY 2012

Constant-Voltage, Constant-Current Controller

With Primary-Side Regulation

Check for Samples: UCC28700, UCC28701, UCC28702, UCC28703

1

FEATURES

DESCRIPTION

The UCC28700 family of flyback power supply

•

< 30-mW No-Load Power for 5-Star Rating

controllers

provides

Constant-Voltage

(CV)

and

•

Primary-Side Regulation (PSR) Eliminates

Constant-Current (CC) output regulation without the

Opto-Coupler

use of an optical coupler. The devices process

•

±5% Voltage and Current Regulation

information from the primary power switch and an

auxiliary flyback winding for precise control of output

•

130-kHz Maximum Switching Frequency

voltage

and

current.

Low

start-up

current,

Enables High-Power Density Charger Designs

dynamically-controlled operating states and a tailored

•

Quasi-Resonant Valley-Switching Operation

modulation profile support very low stand-by power

for Highest Overall Efficiency

without sacrificing start-up time or output transient

response.

•

Patent-Pending Frequency-Jitter Scheme to

Ease EMI Compliance

Control algorithms in the UCC28700 family allow

•

Wide VDD Range Allows Small Bias Capacitor

operating efficiencies to meet or exceed applicable

standards. The output drive interfaces to a MOSFET

•

Clamped Gate-Drive Output for MOSFET

power

switch.

Discontinuous

Conduction

Mode

•

Protection Functions: Over-Voltage, Low-Line,

(DCM) with valley switching reduces switching losses.

and Over-Current

Modulation

of

switching

frequency

and

primary

•

Programmable Cable Compensation

current peak amplitude (FM and AM) keeps the

conversion efficiency high across the entire load and

(UCC28700 only)

line ranges.

•

NTC Resistor Interface (UCC28701, UCC28702

and UCC28703 only) with Fixed Cable

The controllers have a maximum switching frequency

Compensation Options

of 130 kHz and always maintain control of the peak-

primary current in the transformer. Protection features

•

SOT23-6 Package

help

keep

primary

and

secondary

component

stresses in check. The UCC28700 allows the level of

APPLICATIONS

cable

compensation

to

be

programmed.

The

•

USB-Compliant Adapters and Chargers for

UCC28701, UCC28702 and UCC28703 devices allow

remote

temperature

sensing

using

a

Negative

Consumer Electronics (cell phones, tablets

Temperature

Coefficient

(NTC)

resistor

while

and cameras)

providing fixed cable-compensation levels.

•

AC and DC Power Supplies

Simplified Application Diagram and Typical V-I Regulation

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.