UCC3895 (ACTIVE)

BiCMOS Advanced Phase Shift PWM Controller

BiCMOS Advanced Phase Shift PWM Controller - UCC3895
 

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 and Resonant Controller

 
Topology
Control Method
Vin (Min) (V)
Vin (Max) (V)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Features
Operating Temperature Range (C)
Pin/Package
UCC3895 LM5046 UCC2895 UCC28950
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   
11    14    11    7.3   
17    105    17    20   
1000    2000    1000    1000   
11/9    Programmable/1.25V    11/9    7.3/6.75   
100    50    100    95   
0.1    1.5
2   
0.1    0.2   
Adjustable Switching Frequency
Current Limiting   
Adjustable Switching Frequency
Current Limiting
Error Amplifier
HV Start-up
Soft Start
Soft Switching   
Adjustable Switching Frequency
Current Limiting   
Adjustable Switching Frequency
Current Limiting   
0 to 70    -40 to 125    -40 to 85    -40 to 125   
20PDIP
20SOIC
20TSSOP   
28HTSSOP
28WQFN   
20PDIP
20SOIC
20TSSOP   
24TSSOP   

Other qualified versions of UCC3895

Version Part Number Definition
Military UCC1895 QML certified for Military and Defense Applications