LM5020 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – 100V Current Mode PWM Controller

October 2004
LM5020
100V Current Mode PWM Controller
General Description
The LM5020 high voltage pulse-width-modulation (PWM)
controller contains all of the features needed to implement
single ended primary power converter topologies. Output
voltage regulation is based on current-mode control, which
eases the design of loop compensation while providing in-
herent line feed-forward. The LM5020 includes a high-
voltage start-up regulator that operates over a wide input
range up to 100V. The PWM controller is designed for high
speed capability including an oscillator frequency range to
1MHz and total propagation delays less than 100ns. Addi-
tional features include an error amplifier, precision reference,
line under-voltage lockout, cycle-by-cycle current limit, slope
compensation, softstart, oscillator synchronization capability
and thermal shutdown. The controller is available in both
MSOP-10 and LLP-10 packages.
Features
n Internal Start-up Bias Regulator
n Error Amplifier
n Precision Voltage Reference
n Programmable Softstart
n 1A Peak Gate Driver
n Maximum Duty Cycle Limiting (80% for LM5020-1 or
50% for LM5020-2)
n Programmable Line Under Voltage Lockout (UVLO) with
Adjustable Hysteresis
n Cycle-by-Cycle Over-Current Protection
n Slope Compensation (LM5020-1)
n Programmable Oscillator Frequency with
Synchronization Capability
n Current Sense Leading Edge Blanking
n Thermal Shutdown Protection
Packages
n MSOP-10
n LLP-10 (4 mm x 4 mm)
Connection Diagram
Top View
20095001
10-Lead MSOP, LLP
Ordering Information
Order Number
LM5020MM-1
LM5020MMX-1
LM5020SD-1
LM5020SDX-1
LM5020MM-2
LM5020MMX-2
LM5020SD-2
LM5020SDX-2
Description
MSOP, 80% Duty Cycle Limit
MSOP, 80% Duty Cycle Limit
LLP, 80% Duty Cycle Limit
LLP, 80% Duty Cycle Limit
MSOP, 50% Duty Cycle Limit
MSOP, 50% Duty Cycle Limit
LLP, 50% Duty Cycle Limit
LLP, 50% Duty Cycle Limit
NSC Package Drawing
MUB-10A
MUB-10A
SDC-10A
SDC-10A
MUB-10A
MUB-10A
SDC-10A
SDC-10A
Supplied As
1000 Units on Tape and Reel
3500 Units on Tape and Reel
1000 Units on Tape and Reel
4500 Units on Tape and Reel
1000 Units on Tape and Reel
3500 Units on Tape and Reel
1000 Units on Tape and Reel
4500 Units on Tape and Reel
© 2004 National Semiconductor Corporation DS200950
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