lm5025asdx National Semiconductor Corporation, lm5025asdx Datasheet

lm5025asdx

Manufacturer Part Number

lm5025asdx

Description

Active Clamp Voltage Mode Pwm Controller

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM5025ASDX.pdf (16 pages)

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Company:

Allchip Electronic(HK) Limited

Part Number:

lm5025asdx/NOPB

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NSC

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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

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.

Typical Application Circuit

Simplified Active Clamp Forward Power Converter

and V

DS201074

REF

regulators

Features

n Internal Start-up Bias Regulator

n 3A Compound Main Gate Driver

n Programmable Line Under-Voltage Lockout (UVLO) with

n Voltage Mode Control with Feed-Forward

n Adjustable Dual Mode Over-Current Protection

n Programmable Overlap or Deadtime between the Main

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

Adjustable Hysteresis

and Active Clamp Outputs

20107401

December 2004

www.national.com

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