有源钳位电压模式 PWM 控制器 - LM5025A

LM5025A (正在供货)

有源钳位电压模式 PWM 控制器

 

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 与谐振控制器

 
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
Rating
Operating Temperature Range (C)
Pin/Package
LM5025A LM5025B LM5025C LM5026
Active-Clamp Forward
Forward   
Active-Clamp Forward
Forward   
Active-Clamp Forward
Forward   
Active-Clamp Forward
Forward   
Feedforward
Voltage   
Feedforward
Voltage   
Feedforward
Voltage   
Current   
13    13    13    13   
90    100    90    100   
1000    1000    1000    1000   
Programmable/2.5V    Programmable/2.5V    Programmable/2.5V    Programmable/1.25V   
80    73    91    80   
3    3    3    3   
Current Limiting
Leading Edge Blanking
Soft Start
Thermal Shutdown   
Current Limiting
Leading Edge Blanking
Soft Start
Thermal Shutdown   
Current Limiting
Leading Edge Blanking
Soft Start
Thermal Shutdown   
Synchronization Pin   
Catalog    Catalog    Catalog    Catalog   
-40 to 125    -40 to 125    -40 to 125    -40 to 125   
16TSSOP
16WSON   
16TSSOP
16WSON   
16TSSOP    16TSSOP
16WSON   
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