UCC28700 Constant-Voltage, Constant-Current PWM With Primary-Side Regulation | TI.com

UCC28700
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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

WEBENCH® Designer UCC28700

 AC  DC  
AC Frequency  60 Hz  50 Hz
Use Isolated Output?
  Min   Max Range
VinRMS  V 85.00 to 500.00V
Vout  V 3.3 to 25V
Iout  A ≤ 10A
Ambient Temp  °C -20 to 125°C

Parametrics

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Part number Order 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 Order now Primary-side regulation     99     132     21/8.1     PSR
DCM    
-20 to 125     SOT-23 | 6     Catalog     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)    
UCC28703 Order now Primary-side regulation     99     132     21/8.1     PSR
DCM    
-20 to 125     SOT-23 | 6     Catalog     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)    
UCC28704 Order now Primary-side regulation     99     85     21/7.7     PSR
DCM    
-40 to 125     SOT-23 | 6     Catalog     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)    
UCC28710 Order now Primary-side regulation     99     100     21/8     PSR
DCM
HV Start-up
Green Mode
Input Line Monitor
Leading Edge Blanking
Light Load Efficiency
Low Power
Soft Start    
-40 to 125     SOIC | 7     Catalog     7SOIC: 29 mm2: 6 x 4.9 (SOIC | 7)    
UCC28720 Order now Primary-side regulation     99     80     21/7.7     PSR
DCM
HV Start-up
Current Limiting
Green Mode
HV Start-up
Input Line Monitor
Leading Edge Blanking
Light Load Efficiency
Low Power
Soft Start    
-40 to 125     SOIC | 7     Catalog     7SOIC: 29 mm2: 6 x 4.9 (SOIC | 7)    
UCC28722 Order now Primary-side regulation     99     80     21/7.7     PSR
DCM    
-40 to 125     SOT-23 | 6     Catalog     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)    
UCC28740 Order now Secondary-side regulation     99     100     21/7.75     SSR
HV Start-up
DCM    
-40 to 125     SOIC | 7     Catalog     7SOIC: 29 mm2: 6 x 4.9 (SOIC | 7)    
UCC28742 Order now Secondary-side regulation     99     105     22/7.7     SSR
DCM    
-40 to 125     SOT-23 | 6     Catalog     6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)