LM5025A 有源钳位电压模式 PWM 控制器 | 德州仪器 TI.com.cn

LM5025A (正在供货)

有源钳位电压模式 PWM 控制器

有源钳位电压模式 PWM 控制器 - LM5025A
数据表
 

描述

The LM5025A is a functional variant of the LM5025 active clamp PWM controller. The functional differences of the LM5025A are that the CS1 and CS2 current limit thresholds have been increased to 0.5 V, the internal CS2 filter discharge device has been disabled and no longer operates each clock cycle, and the internal VCC and VREF regulators continue to operate when the line UVLO pin is below threshold.

The LM5025A PWM controller contains all of the features necessary to implement power converters using the Active Clamp / Reset technique. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp / reset techniques. Two control outputs are provided: the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The two internal compound gate drivers parallel both MOS and bipolar devices, providing superior gate drive characteristics. This controller is designed for high-speed operation including an oscillator frequency range up to 1 MHz and total PWM and current sense propagation delays less than 100 ns. The LM5025A includes a high-voltage start-up regulator that operates over a wide input range of 13 V to 90 V. Additional features include: line undervoltage lockout (UVLO), soft start, oscillator UP and DOWN sync capability, precision reference, and thermal shutdown.

特性

  • Internal Start-Up Bias Regulator
  • 3-A Compound Main Gate Driver
  • Programmable Line Undervoltage Lockout (UVLO) With Adjustable Hysteresis
  • Voltage Mode Control With Feedforward
  • Adjustable Dual Mode Overcurrent Protection
  • Programmable Overlap or Dead Time Between the Main and Active Clamp Outputs
  • Volt × Second Clamp
  • Programmable Soft Start
  • Leading Edge Blanking
  • Single Resistor Programmable Oscillator
  • Oscillator UP and DOWN Sync Capability
  • Precision 5-V Reference
  • Thermal Shutdown
  • Packages:
    • 16-Pin TSSOP
    • Thermally Enhanced 16-Pin WSON (5 mm × 5 mm)

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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
LM5025A LM5025 LM5025B LM5025C
Active-Clamp Forward
Forward    
Active-Clamp Forward
Forward    
Active-Clamp Forward
Forward    
Active-Clamp Forward
Forward    
Feedforward
Voltage    
Feedforward
Voltage    
Feedforward
Voltage    
Feedforward
Voltage    
8     8     8     8    
15     15     15     15    
1000     1000     1000     1000    
Programmable/2.5V     Programmable/2.5V     Programmable/2.5V     Programmable/2.5V    
80     80     73     91    
3     3     3     3    
Current Limiting
HV Start-up
Leading Edge Blanking
Soft Start
Supports NFET Clamp
Supports PFET Clamp
Thermal Shutdown    
Current Limiting
HV Start-up
Leading Edge Blanking
Soft Start
Supports NFET Clamp
Supports PFET Clamp
Thermal Shutdown    
Current Limiting
HV Start-up
Leading Edge Blanking
Soft Start
Supports NFET Clamp
Supports PFET Clamp
Thermal Shutdown    
Current Limiting
HV Start-up
Leading Edge Blanking
Soft Start
Supports NFET Clamp
Supports PFET Clamp
Thermal Shutdown    
Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
16TSSOP
16WSON    
16TSSOP
16WSON    
16TSSOP
16WSON    
16TSSOP