UCC28951 Phase-Shifted Full-Bridge Controller for Wide Input Voltage Range | TI.com

UCC28951 (ACTIVE)

Phase-Shifted Full-Bridge Controller for Wide Input Voltage Range

Phase-Shifted Full-Bridge Controller for Wide Input Voltage Range - UCC28951
 

Description

The UCC28951 device is an enhanced version of the UCC28950. It is a fully compatible drop-in replacement for the UCC28950. Refer to application note SLUA853 to determine which controller to use. The UCC28951 uses advanced control of the full-bridge in addition to active control of the synchronous rectifier (SR) output stage.

Programmable delays ensure ZVS operation over a wide range of operating conditions, while the load current naturally tunes the switching delays of the secondary-side synchronous rectifiers(SR). This functionality maximizes overall system efficiency.

The UCC28951 has many light-load management features including burst-mode operation and dynamic SR ON and OFF control during transition into and out of discontinuous current mode (DCM) operation. The device operates in current-mode or voltage-mode control. The switching frequency can be programmed up to 1 MHz. The device has protection features including cycle-by-cycle current limit, UVLO, and thermal shutdown.

The 24-pin, TSSOP package complies with RoHS requirements .

Features

  • Enhanced Zero-Voltage Switching (ZVS) Range
  • Direct Synchronous Rectifier (SR) Control
  • Light-Load Efficiency Management Including:
    • Burst Mode Operation
    • Discontinuous Conduction Mode (DCM), Dynamic SR On/Off Control With Programmable Threshold
    • Programmable Adaptive Delay
  • Average- or Peak-Current Mode Control With Programmable Slope Compensation and Voltage-Mode Control
  • Closed-Loop Soft-Start and Enable Function
  • Programmable Switching Frequency up to 1 MHz With Bidirectional 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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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)
Pin/Package
UCC28951 LM5046 UCC2895 UCC28950 UCC3895
Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge    
Current
Peak Current Mode
Voltage    
Current
Voltage    
Current
Feedforward
Voltage    
Current
Voltage    
Current
Feedforward
Voltage    
8     10     10     8     10    
17     14     16.5     17     16.5    
1000     2000     1000     1000     1000    
7.3/6.7     Programmable/1.25V     11/9     7.3/6.75     11/9    
97     50     100     95     100    
0.2     1.5
2    
0.1     0.2     0.1    
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    
Adjustable Switching Frequency
Current Limiting
Error Amplifier
HV Start-up
SR Logic
Soft Start
Soft Switching    
Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology
Soft Start
Soft Switching
Synchronization Pin    
Adjustable Switching Frequency
Current Limiting
Error Amplifier
Light Load Efficiency
Multi-topology
SR Logic
Soft Start
Soft Switching
Synchronization Pin    
Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology
Soft Start
Soft Switching
Synchronization Pin    
Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 85     -40 to 125     0 to 70    
24TSSOP     28HTSSOP
28WQFN    
20PDIP
20SOIC
20TSSOP    
24TSSOP     20PDIP
20SOIC
20TSSOP