UCC28950 Green Phase-Shifted Full-Bridge Controller with Synchronous Rectification | TI.com

UCC28950 (ACTIVE) Green Phase-Shifted Full-Bridge Controller with Synchronous Rectification

 

Description

The UCC28950 enhanced phase-shifted controller builds upon Texas Instrument’s industry standard UCx895 phase-shifted controller family with enhancements that offer best in class efficiency in today’s high performance power systems. The UCC28950 implements advanced control of the full-bridge along with active control of the synchronous rectifier output stage.

The primary-side signals allow programmable delays to ensure ZVS operation over wide-load current and input voltage range, while the load current naturally tunes the secondary-side synchronous rectifiers switching delays, maximizing overall system efficiency.

The UCC28950 also offers multiple light-load management features including burst mode and dynamic SR on/off control when transitioning in and out of Discontinuous Current Mode (DCM) operation, ensuring ZVS operation is extended down to much lighter loads.

In addition, the UCC28950 includes support for current or voltage mode control. Programmable switching frequency up to 1 MHz and a wide set of protection features including cycle-by-cycle current limit, UVLO and thermal shutdown. A 90-degree phase-shifted interleaved synchronized operation can be easily arranged between two converters.

The UCC28950 is available in TSSOP-24 package.

For all available packages, see the orderable addendum at the end of the datasheet.

Features

  • Enhanced Wide Range Resonant Zero Voltage Switching (ZVS) Capability
  • Direct Synchronous Rectifier (SR) Control
  • Light-Load Efficiency Management Including
    • Burst Mode Operation
    • Discontinuous Conduction Mode (DCM), Dynamic SR On and Off Control with Programmable Threshold
    • Programmable Adaptive Delay
  • Average or Peak Current Mode Control With Programmable Slope Compensation and Voltage Mode Control
  • Naturally Handles Pre-Biased Start Up With DCM Mode
  • Closed Loop Soft Start and Enable Function
  • Programmable Switching Frequency up to 1 MHz with Bi-Directional Synchronization
  • (±3%) Cycle-by-Cycle Current Limit Protection With Hiccup Mode Support
  • 150-µA Start-Up Current
  • VDD Undervoltage Lockout
  • Wide Temperature Range –40°C to +125°C

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WEBENCH® Designer UCC28950

  Min   Max Range
Vin  V 15.0 to 2000.0V
Vout  V 3.3 to 50V
Iout  A ≤ 300A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Topology Control method VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) UVLO thresholds on/off (V) Duty cycle (Max) (%) Gate drive (Typ) (A) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
UCC28950 Order now Phase-Shifted Full-Bridge     Current
Voltage    
8     17     1000     7.3/6.75     95     0.2     Adjustable Switching Frequency
Current Limiting
Error Amplifier
Light Load Efficiency
Multi-topology
SR Logic
Soft Start
Soft Switching
Synchronization Pin    
Catalog     -40 to 125     TSSOP | 24     24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24)    
LM5046 Order now Phase-Shifted Full-Bridge     Current
Voltage    
10     14     1000     Programmable/1.25V     100     1.5
2    
Adjustable Switching Frequency
Current Limiting
Error Amplifier
HV Start-up
SR Logic
Soft Start
Soft Switching    
Catalog     -40 to 125     HTSSOP | 28
WQFN | 28    
28HTSSOP: 43 mm2: 4.4 x 9.7 (HTSSOP | 28)
28WQFN: 25 mm2: 5 x 5 (WQFN | 28)    
UCC2895 Order now Phase-Shifted Full-Bridge     Current
Feedforward
Voltage    
10     16.5     1000     11/9     100     0.1     Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology
Soft Start
Soft Switching
Synchronization Pin    
Catalog     -40 to 85     PDIP | 20
SOIC | 20
TSSOP | 20    
See datasheet (PDIP)
20SOIC: 132 mm2: 10.3 x 12.8 (SOIC | 20)
20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)    
UCC28951 Order now Phase-Shifted Full-Bridge     Current
Peak Current Mode
Voltage    
8     17     1000     7.3/6.7     97     0.2     Adjustable Switching Frequency
Current Limiting
Enable/Shutdown
Error Amplifier
Green Mode
Light Load Efficiency
Programmable Slope Compensation
Soft Start
Soft Switching
Synchronization Pin
Thermal Shutdown    
Catalog     -40 to 125     TSSOP | 24     24TSSOP: 34 mm2: 4.4 x 7.8 (TSSOP | 24)    
UCC3895 Order now Phase-Shifted Full-Bridge     Current
Feedforward
Voltage    
10     16.5     1000     11/9     100     0.1     Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology
Soft Start
Soft Switching
Synchronization Pin    
Catalog     0 to 70     PDIP | 20
SOIC | 20
TSSOP | 20    
See datasheet (PDIP)
20SOIC: 132 mm2: 10.3 x 12.8 (SOIC | 20)
20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)