lm5020sdx-2 National Semiconductor Corporation, lm5020sdx-2 Datasheet

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lm5020sdx-2

Manufacturer Part Number
lm5020sdx-2
Description
100v Current Mode Pwm Controller
Manufacturer
National Semiconductor Corporation
Datasheet
© 2006 National Semiconductor Corporation
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.
Typical Application Circuit
DS200950
Non-Isolated Flyback Converter
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
n Programmable Line Under Voltage Lockout (UVLO) with
n Cycle-by-Cycle Over-Current Protection
n Slope Compensation (LM5020-1)
n Programmable Oscillator Frequency with
n Current Sense Leading Edge Blanking
n Thermal Shutdown Protection
Applications
n Telecommunication Power Converters
n Industrial Power Converters
n +42V Automotive Systems
Packages
n MSOP-10
n LLP-10 (4 mm x 4 mm)
50% for LM5020-2)
Adjustable Hysteresis
Synchronization Capability
20095013
www.national.com
April 2006

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lm5020sdx-2 Summary of contents

Page 1

... The controller is available in both MSOP-10 and LLP-10 packages. Typical Application Circuit © 2006 National Semiconductor Corporation Features n Internal Start-up Bias Regulator n Error Amplifier n Precision Voltage Reference ...

Page 2

... LLP, 80% Duty Cycle Limit LM5020SDX-1 LLP, 80% Duty Cycle Limit LM5020MM-2 MSOP, 50% Duty Cycle Limit LM5020MMX-2 MSOP, 50% Duty Cycle Limit LM5020SD-2 LLP, 50% Duty Cycle Limit LM5020SDX-2 LLP, 50% Duty Cycle Limit www.national.com Top View 10-Lead MSOP, LLP Description NSC Package Drawing MUB-10A MUB-10A ...

Page 3

Pin Descriptions Pin Name 1 VIN Source Input Voltage 2 FB Feedback Signal 3 COMP The output of the error amplifier and input to the Pulse Width Modulator 4 VCC Output of the internal high voltage series pass regulator. Regulated ...

Page 4

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN to GND VCC to GND RT to GND All other pins to GND Power Dissipation ESD Rating (Note ...

Page 5

Electrical Characteristics Specifications in standard type face are for T perature range. Unless otherwise specified: VIN = 48V, VCC = 10V, and RT = 31.6kΩ. (Note 3) Symbol Parameter Oscillator Frequency1 (RT = 31.6k) Frequency2 (RT = 9.76k) Sync threshold ...

Page 6

Typical Performance Characteristics V and Oscillator Frequency vs RT Soft Start Current vs Temperature www.national.com Unless otherwise specified 20095006 Oscillator Frequency vs Temperature 20095008 20095010 6 = 25˚ ...

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Block Diagram FIGURE 1. 7 20095002 www.national.com ...

Page 8

Detailed Operating Description The LM5020 High Voltage PWM controller contains all of the features needed to implement single ended primary power converter topologies. The LM5020 includes a high-voltage startup regulator that operates over a wide input range to 100V. The ...

Page 9

Oscillator and Sync Capability A single external resistor connected between the RT and GND pins sets the LM5020 oscillator frequency. Internal to the LM5020-2 device (50% duty cycle limited option oscillator divide by two circuit. This divide by ...

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www.national.com 10 ...

Page 11

ITEM PART NUMBER C 1 C4532X7R2A225M C 2 C4532X7R2A225M C 3 C2012X7R1H103K C 4 C3216X7R2A104K C 5 C2012X7R1H103K C 6 C2012C0G1H221J C 7 C2012C0G1H332J C 8 C2012C0G1H101J C 9 C2012X7R1H104K C 10 C3216X7R1C475K C 11 C2012C0G1H102J C 12 C2012C0G1H471J C ...

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Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 10 Lead MSOP Package NS Package Number MUB10A 10 Lead MSOP, LLP Package NS Package Number SDC10A 12 ...

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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information ...

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