LM5025B 有源钳位电压模式 PWM 控制器 | 德州仪器 TI.com.cn

LM5025B (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 - LM5025B
数据表
 

描述

The LM5025B is a functional variant of the LM5025 active clamp PWM controller. The functional differences of the LM5025B are as follows:

  • The maximum PWM duty cycle is limited to less than 75% to reduce voltage stress on the power MOSFETs.
  • The CS2 hiccup mode threshold is increased to 0.5V
  • The CS2 filter discharge device is disabled
  • The VCC regulator continues to operate when the line UVLO is below the threshold of normal operation
  • The VREF regulator is switched off when the line UVLO input falls below the operating threshold
  • The internal 5kΩ COMP pin pull-up resistor is removed

The LM5025B 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 100ns.

The LM5025B includes a high-voltage start-up regulator that operates over a wide input range of 13V to 100V. 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 Maximum Duty Cycle Clamp
  • Programmable Soft-Start
  • Current Sense Leading Edge Blanking
  • Single Resistor Programmable Oscillator
  • Oscillator Up / Down Sync Capability
  • Precision 5V Reference
  • Thermal Shutdown

Packages

  • TSSOP-16
  • WSON-16 (5x5 mm) Thermally Enhanced

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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)
Package Group
Package size: mm2:W x L (PKG)
LM5025B LM5025 LM5025A 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    
73     80     80     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    
TSSOP | 16
WSON | 16    
TSSOP | 16
WSON | 16    
TSSOP | 16
WSON | 16    
TSSOP | 16    
16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)
See datasheet (WSON)    
16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)
See datasheet (WSON)    
16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)
See datasheet (WSON)    
16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)