LM5026 有源钳位电流模式 PWM 控制器 | 德州仪器 TI.com.cn

LM5026 (正在供货)

有源钳位电流模式 PWM 控制器

有源钳位电流模式 PWM 控制器 - LM5026


The LM5026 PWM controller contains all of the features necessary to implement power converters utilizing the active clamp and reset technique with current-mode control. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp and reset techniques. Two control outputs are provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The device can be configured to control either a P-Channel or N-Channel clamp switch. The main gate driver features a compound configuration, consisting of both MOS and Bipolar devices, providing superior gate drive characteristics. The LM5026 can be configured to operate with bias voltages over a wide input range of 8 V to 100 V. Additional features include programmable maximum duty cycle, line undervoltage lockout, cycle-by-cycle current limit, hiccup mode fault operation with adjustable timeout delay, PWM slope compensation, soft-start, 1-MHz capable oscillator with synchronization input and output capability, precision reference, and thermal shutdown.


  • Current-Mode Control
  • Internal 100-V Start-Up Bias Regulator
  • 3-A Compound Main Gate Driver
  • High Bandwidth Optocoupler Interface
  • Programmable Line Undervoltage Lockout (UVLO)
    With Adjustable Hysteresis
  • Versatile Dual Mode Overcurrent Protection With
    Hiccup Delay Timer
  • Programmable Overlap or Deadtime between the
    Main and Active Clamp Outputs
  • Programmable Maximum Duty Cycle Clamp
  • Programmable Soft-Start
  • Leading Edge Blanking
  • Resistor Programmed 1-MHz Capable Oscillator
  • Oscillator Sync I/O Capability
  • Precision 5-V Reference


参数 与其它产品相比 PWM控制器和谐振控制器

Control method
VCC (Min) (V)
VCC (Max) (V)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Operating Temperature Range (C)
LM5026 LM5034 UCC2897A
Active-Clamp Forward
Active-Clamp Forward
Active-Clamp Forward
Current     Current     Current    
8     8     8.5    
15     15     16    
1000     2000     1000    
Programmable/1.25V     Programmable/1.25V     12.7/~8    
80     76     74    
3     2.5     2    
Current Limiting
Dead Time Control
HV Start-up
Leading Edge Blanking
Programmable Max Duty Cycle
Programmable Soft Start
Supports NFET Clamp
Supports PFET Clamp
Synchronization Pin    
Current Limiting
HV Start-up
Soft Start
Supports PFET Clamp
Synchronization Pin    
HV Start-up
Input Line Monitor
Programmable Slope Compensation
Soft Start
Soft Switching
Supports PFET Clamp    
Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125    
20TSSOP     20QFN