UCC28700 (ACTIVE)

Constant-Voltage, Constant-Current PWM With Primary-Side Regulation

 

Description

The UCC28700 family of flyback power supply controllers provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. Low start-up current, dynamically controlled operating states and a tailored modulation profile support very low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28700 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous Conduction Mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controllers have a maximum switching frequency of 130 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28700 allows the level of cable compensation to be programmed. The UCC28701, UCC28702, and UCC28703 devices allow remote temperature sensing using a Negative Temperature Coefficient (NTC) resistor while providing fixed cable-compensation levels.

Features

  • < 30-mW No-Load Power for 5-Star Rating
  • Primary-Side Regulation (PSR) Eliminates Opto-Coupler
  • ±5% Voltage and Current Regulation
  • 130-kHz Maximum Switching Frequency Enables High-Power
    Density Charger Designs
  • Quasi-Resonant Valley-Switching Operation for Highest
    Overall Efficiency
  • Patent-Pending Frequency-Jitter Scheme to Ease EMI
    Compliance
  • Wide VDD Range Allows Small Bias Capacitor
  • Clamped Gate-Drive Output for MOSFET
  • Protection Functions: Overvoltage, Low-Line, and
    Overcurrent
  • Programmable Cable Compensation (UCC28700 Only)
  • NTC Resistor Interface (UCC28701, UCC28702 and UCC28703
    Only) With Fixed Cable Compensation Options
  • SOT-23 Package

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Parametrics Compare all products in Flyback Controller

 
Control Method
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Features
Operating Temperature Range (C)
Package Group
Rating
Package Size: mm2:W x L (PKG)
UCC28700 UCC28703 UCC28704
Current    Current    Current   
99    99    99   
132    132    85   
21/8.1    21/8.1    21/7.7   
PSR
Adjustable CBC
CV/CC Control
DCM
Power Delivery Compatible   
PSR
Fixed CBC
NTC Configurable
CV/CC Control
DCM   
PSR
HV Start-up Configurable
Fixed CBC
NTC Configurable
CV/CC Control
DCM
USB Type-C Compatible
IoT Compatible
Power Delivery Compatible   
-20 to 125    -20 to 125    -40 to 125   
SOT-23    SOT-23    SOT-23   
Catalog    Catalog    Catalog   
6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)   

Other qualified versions of UCC28700

Version Part Number Definition
Automotive UCC28700-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

WEBENCH® Designer UCC28700

 AC  DC  
AC Frequency  60 Hz  50 Hz
Use Isolated Output?
  Min   Max Range
VinRMS  V 85.00 to 480.00V
Vout  V 3.3 to 25.0V
Iout  A ≤ 10.0A
Ambient Temp  °C -20 to 125°C