UCC3895 BiCMOS Advanced Phase Shift PWM Controller | TI.com

UCC3895 (ACTIVE)

BiCMOS Advanced Phase Shift PWM Controller

 

Description

The UCC3895 is a phase-shift PWM controller that implements control of a full-bridge power stage by phase shifting the switching of one half-bridge with respect to the other. The device allows constant frequency pulse-width modulation in conjunction with resonant zero-voltage switching to provide high efficiency at high frequencies. The part is used either as a voltage-mode or current-mode controller.

While the UCC3895 maintains the functionality of the UC3875/6/7/8 family and UC3879, it improves on that controller family with additional features such as enhanced control logic, adaptive delay set, and shutdown capability. Because the device is built using the BCDMOS process, it operates with dramatically less supply current than it’s bipolar counterparts. The UCC3895 operates with a maximum clock frequency of 1 MHz.

Features

  • Programmable-Output Turnon Delay
  • Adaptive Delay Set
  • Bidirectional Oscillator Synchronization
  • Voltage-Mode, Peak Current-Mode, or Average
    Current-Mode Control
  • Programmable Softstart, Softstop and
    Chip Disable via a Single Pin
  • 0% to 100% Duty-Cycle Control
  • 7-MHz Error Amplifier
  • Operation to 1 MHz
  • Typical 5-mA Operating Current at 500 kHz
  • Very Low 150-µA Current During UVLO

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Parametrics Compare all products in PWM controllers & resonant controllers

 
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)
UCC3895 LM5046 UCC2895 UCC28950 UCC28951
Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge     Phase-Shifted Full-Bridge    
Current
Feedforward
Voltage    
Current
Voltage    
Current
Feedforward
Voltage    
Current
Voltage    
Current
Peak Current Mode
Voltage    
10     10     10     8     8    
16.5     14     16.5     17     17    
1000     2000     1000     1000     1000    
11/9     Programmable/1.25V     11/9     7.3/6.75     7.3/6.7    
100     50     100     95     97    
0.1     1.5
2    
0.1     0.2     0.2    
Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology
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
Error Amplifier
Light Load Efficiency
Multi-topology
SR Logic
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    
Catalog     Catalog     Catalog     Catalog     Catalog    
0 to 70     -40 to 125     -40 to 85     -40 to 125     -40 to 125    
PDIP | 20
SOIC | 20
TSSOP | 20    
HTSSOP | 28
WQFN | 28    
PDIP | 20
SOIC | 20
TSSOP | 20    
TSSOP | 24     TSSOP | 24    
See datasheet (PDIP)
20SOIC: 132 mm2: 10.3 x 12.8 (SOIC | 20)
20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)    
28HTSSOP: 62 mm2: 6.4 x 9.7 (HTSSOP | 28)
28WQFN: 25 mm2: 5 x 5 (WQFN | 28)    
See datasheet (PDIP)
20SOIC: 132 mm2: 10.3 x 12.8 (SOIC | 20)
20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)    
24TSSOP: 50 mm2: 6.4 x 7.8 (TSSOP | 24)     24TSSOP: 50 mm2: 6.4 x 7.8 (TSSOP | 24)