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LM5025MTC 데이터시트 PDF




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부품번호 LM5025MTC 기능
기능 Active Clamp Voltage Mode PWM Controller
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LM5025MTC 데이터시트, 핀배열, 회로
March 2004
LM5025
Active Clamp Voltage Mode PWM Controller
General Description
The LM5025 PWM controller contains all of the features
necessary to implement power converters utilizing the Active
Clamp / Reset technique. The device can be configured to
control either a P-Channel clamp switch or an N-Channel
clamp switch. With the active clamp technique, higher effi-
ciencies and greater power densities can be realized com-
pared 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 active clamp output can be configured
for either a guaranteed overlap time (for P-Channel switch
applications) or a guaranteed deadtime (for N_Channel ap-
plications). 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 LM5025 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, pre-
cision 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
Simplified Active Clamp Forward Power Converter
20086901
© 2004 National Semiconductor Corporation DS200869
www.national.com




LM5025MTC pdf, 반도체, 판매, 대치품
Block Diagram
Simplified Block Diagram
www.national.com
20086902
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LM5025MTC 전자부품, 판매, 대치품
Electrical Characteristics (Continued)
Specifications with standard typeface are for TJ = 25˚C, and those with boldface type apply over full Operating Junction
Temperature range. VIN = 48V, VCC = 10V, RT = 31.3k, RSET = 27.4k) unless otherwise stated (Note 3)
Symbol
Parameter
Conditions Min Typ
Max
Units
OUTPUT_B Fall Time
Output Timing Control
Cgate = 1nF
15 ns
Overlap Time
RSET = 38 kconnected
to GND, 50% to 50%
75
105
135 ns
transitions
Deadtime
RSET = 29.5 k
connected to REF, 50%
75
105
135 ns
to 50% transitions
Thermal Shutdown
TSD Thermal Shutdown
Threshold
165 ˚C
Thermal Shutdown
25 ˚C
Hysteresis
Thermal Resistance
θJA
Junction to Ambient
MTC Package
SDA Package
125 ˚C/W
32 ˚C/W
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device
is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: For detailed information on soldering plastic TSSOP and LLP packages, refer to the Packaging Data Book available from National Semiconductor
Corporation.
Note 3: All limits are guaranteed. All electrical characteristics having room temperature limits are tested during production with TA = TJ = 25˚C. All hot and cold limits
are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
Note 4: Device thermal limitations may limit usable range.
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