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LM5025BMTC Datasheet

  • LM5025BMTC

  • National Semiconductor [Active Clamp Voltage Mode PWM Contr...

  • 708.86KB

  • NSC

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LM5025B Active Clamp Voltage Mode PWM Controller
March 2006
LM5025B
Active Clamp Voltage Mode PWM Controller
General Description
The LM5025B is a functional variant of the LM5025 active
clamp PWM controller. The functional differences of the
LM5025B are as follows:
鈥?/div>
The maximum PWM duty cycle is limited to less than
75% to reduce voltage stress on the power MOSFETs.
鈥?/div>
The CS2 hiccup mode threshold is increased to 0.5V
鈥?/div>
The CS2 filter discharge device is disabled
鈥?/div>
The V
CC
regulator continues to operate when the line
UVLO is below the threshold of normal operation
鈥?/div>
The V
REF
regulator is switched off when the line UVLO
input falls below the operating threshold
鈥?/div>
The internal 5k鈩?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 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 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), soft-
start, oscillator UP/DOWN sync capability, precision refer-
ence 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 maximum duty cycle clamp
n
Programmable soft-start
n
Current sense 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
20141101
Simplified Active Clamp Forward Power Converter
漏 2006 National Semiconductor Corporation
DS201411
www.national.com

LM5025BMTC PDF文件相关型号

LM5025BMTCX,LM5025BSD,LM5025BSDX

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