UCC28950 具有同步整流的绿色环保相移全桥控制器 | 德州仪器 TI.com.cn

UCC28950 (正在供货)

具有同步整流的绿色环保相移全桥控制器

 

描述

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.

特性

  • 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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参数 与其它产品相比 PWM控制器和谐振控制器

 
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
UCC28950 LM5046 UCC2895 UCC28951 UCC3895
Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge    
Current
Voltage    
Current
Voltage    
Current
Feedforward
Voltage    
Current
Peak Current Mode
Voltage    
Current
Feedforward
Voltage    
8     10     10     8     10    
17     14     16.5     17     16.5    
1000     2000     1000     1000     1000    
7.3/6.75     Programmable/1.25V     11/9     7.3/6.7     11/9    
95     50     100     97     100    
0.2     1.5
2    
0.1     0.2     0.1    
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
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
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
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