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LM5025ASDX Datasheet

  • LM5025ASDX

  • Active Clamp Voltage Mode PWM Controller

  • 16頁

  • NSC

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LM5025A Active Clamp Voltage Mode PWM Controller
December 2004
LM5025A
Active Clamp Voltage Mode PWM Controller
General Description
The LM5025A is a functional variant of the LM5025 active
clamp PWM controller. The functional differences of the
LM5025A are: The CS1 and CS2 current limit thresholds
have been increased to 0.5V. The internal CS2 filter dis-
charge device has been disabled and no longer operates
each clock cycle. The internal V
CC
and V
REF
regulators
continue to operate when the line UVLO pin is below thresh-
old.
The LM5025A 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 real-
ized 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 de-
signed for high-speed operation including an oscillator fre-
quency range up to 1MHz and total PWM and current sense
propagation delays less than 100ns. The LM5025A 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.
Features
n
Internal Start-up Bias Regulator
n
3A Compound Main Gate Driver
n
Programmable Line Under-Voltage Lockout (UVLO) with
Adjustable Hysteresis
n
Voltage Mode Control with Feed-Forward
n
Adjustable Dual Mode Over-Current Protection
n
Programmable Overlap or Deadtime between the Main
and Active Clamp Outputs
n
Volt x Second Clamp
n
Programmable Soft-start
n
Leading Edge Blanking
n
Single Resistor Programmable Oscillator
n
Oscillator UP / DOWN Sync Capability
n
Precision 5V Reference
n
Thermal Shutdown
Packages
n
TSSOP-16
n
LLP-16 (5x5 mm) Thermally Enhanced
Typical Application Circuit
20107401
Simplified Active Clamp Forward Power Converter
漏 2004 National Semiconductor Corporation
DS201074
www.national.com

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