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National Semiconductor Electronic Components Datasheet

LM5022 Datasheet

60V Low Side Controller

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January 2007
LM5022
60V Low Side Controller for Boost and SEPIC
General Description
The LM5022 is a high voltage low-side N-channel MOSFET
controller ideal for use in boost and SEPIC regulators. It con-
tains all of the features needed to implement single ended
primary topologies. Output voltage regulation is based on
current-mode control, which eases the design of loop com-
pensation while providing inherent input voltage feed-forward.
The LM5022 includes a start-up regulator that operates over
a wide input range of 6V to 60V. The PWM controller is de-
signed for high speed capability including an oscillator fre-
quency range up to 2 MHz and total propagation delays less
than 100 ns. Additional features include an error amplifier,
precision reference, line under-voltage lockout, cycle-by-cy-
cle current limit, slope compensation, soft-start, external syn-
chronization capability and thermal shutdown. The LM5022 is
available in the MSOP-10 package.
Features
Internal 60V Startup Regulator
1A Peak MOSFET Gate Driver
VIN Range 6V to 60V
Duty Cycle Limit of 90%
Programmable UVLO with Hysteresis
Cycle-by-Cycle Current Limit
External Synchronizable (AC-coupled)
Single Resistor Oscillator Frequency Set
Slope Compensation
Adjustable Soft-start
MSOP-10 Package
Applications
Boost Converter
SEPIC Converter
Typical Application
© 2007 National Semiconductor Corporation 202122
20212201
www.national.com


National Semiconductor Electronic Components Datasheet

LM5022 Datasheet

60V Low Side Controller

No Preview Available !

Connection Diagram
20212253
10-Lead MSOP
NS Package Number MUB10A
Ordering Information
Part Number
LM5022MM
LM5022MMX
Pin Descriptions
NS Package Drawing
MUB10A
MUB10A
Supplied As
1000 Units on Tape and Reel
3500 Units on Tape and Reel
Pin(s)
1
2
3
4
5
6
7
8
9
10
Name
VIN
FB
COMP
VCC
OUT
GND
UVLO
CS
RT/SYNC
SS
Description
Application Information
Source input voltage
Input to the start-up regulator. Operates from 6V to 60V.
Feedback pin
Inverting input to the internal voltage error amplifier. The non-
inverting input of the error amplifier connects to a 1.25V
reference.
Error amplifier output and PWM
comparator input
The control loop compensation components connect between
this pin and the FB pin.
Output of the internal, high voltage linear This pin should be bypassed to the GND pin with a ceramic
regulator.
capacitor.
Output of MOSFET gate driver
Connect this pin to the gate of the external MOSFET. The gate
driver has a 1A peak current capability.
System ground
Input Under-Voltage Lock-out
Set the start-up and shutdown levels by connecting this pin to the
input voltage through a resistor divider. A 20 µA current source
provides hysteresis.
Current Sense input
Input for the switch current used for current mode control and for
current limiting.
Oscillator frequency adjust pin and
synchronization input
An external resistor connected from this pin to GND sets the
oscillator frequency. This pin can also accept an AC-coupled
input for synchronization from an external clock.
Soft-start pin
An external capacitor placed from this pin to ground will be
charged by a 10 µA current source, creating a ramp voltage to
control the regulator start-up.
www.national.com
2


Part Number LM5022
Description 60V Low Side Controller
Maker National Semiconductor
PDF Download

LM5022 Datasheet PDF





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