LM5025C 有源钳位电压模式 PWM 控制器 | 德州仪器 TI.com.cn

LM5025C (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 - LM5025C
数据表
 

描述

The LM5025C is a functional variant of the LM5025 active clamp PWM controller. The functional differences of the LM5025C are: The maximum duty cycle of the LM5025C is increased from 80% to 91%. The soft-start capacitor charging current is increased from 20 µA to 90 µA. The VCC regulator current limit threshold is increased from 25 mA to 55 mA. The CS1 and CS2 current limit thresholds have been increased to 0.5V. The internal CS2 filter discharge device has been disabled and no longer operates each clock cycle. The internal VCC and VREF regulators continue to operate when the line UVLO pin is below threshold.

The LM5025C PWM controller contains all of the features necessary to implement power converters utilizing 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 1MHz and total PWM and current sense propagation delays less than 100 ns. The LM5025C includes a high-voltage start-up regulator that operates over a wide input range of 13V to 90V. Additional features include: Line Under Voltage Lockout (UVLO), softstart, oscillator UP/DOWN sync capability, precision reference and thermal shutdown.

特性

  • Internal Start-Up Bias Regulator
  • 3A Compound Main Gate Driver
  • Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis
  • Voltage Mode Control with Feed-Forward
  • Adjustable Dual Mode Over-Current Protection
  • Programmable Overlap or Deadtime between the Main and Active Clamp Outputs
  • Volt x Second Clamp
  • Programmable Soft-start
  • Leading Edge Blanking
  • Single Resistor Programmable Oscillator
  • Oscillator UP / DOWN Sync Capability
  • Precision 5V Reference
  • Thermal Shutdown

Package

  • TSSOP-16

All trademarks are the property of their respective owners.

查看更多内容

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
LM5025C LM5025 LM5025A LM5025B
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    
91     80     80     73    
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     16TSSOP
16WSON    
16TSSOP
16WSON    
16TSSOP
16WSON