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National Semiconductor Electronic Components Datasheet

LM5001 Datasheet

High Voltage Switch Mode Regulator

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August 2007
LM5001
High Voltage Switch Mode Regulator
General Description
The LM5001 high voltage switch mode regulator features all
of the functions necessary to implement efficient high voltage
Boost, Flyback, SEPIC and Forward converters, using few
external components. This easy to use regulator integrates a
75 Volt N-Channel MOSFET with a 1 Amp peak current limit.
Current mode control provides inherently simple loop com-
pensation and line-voltage feed-forward for superior rejection
www.DataSheeot4f Uin.pcuotmtransients. The switching frequency is set with a single
resistor and is programmable up to 1.5MHz. The oscillator
can also be synchronized to an external clock. Additional pro-
tection features include: current limit, thermal shutdown, un-
der-voltage lockout and remote shutdown capability. The
device is available in both SO-8 and LLP-8 packages.
Features
Integrated 75 volt N-Channel MOSFET
Ultra-wide input voltage range from 3.1V to 75V
Integrated high voltage bias regulator
Adjustable output voltage
1.5% output voltage accuracy
Current mode control with selectable compensation
Wide bandwidth error amplifier
Integrated current sensing and limiting
Integrated slope compensation
85% maximum duty cycle limit
Single resistor oscillator programming
Oscillator synchronization capability
Enable / Undervoltage Lockout (UVLO) pin
Thermal shutdown
Packages
SO-8
LLP-8 (4mm x 4mm)
Typical Application Circuit
Boost Regulator Application Schematic
20215701
© 2007 National Semiconductor Corporation 202157
www.national.com


National Semiconductor Electronic Components Datasheet

LM5001 Datasheet

High Voltage Switch Mode Regulator

No Preview Available !

Connection Diagrams
Top View
SO-8 Package
Top View
LLP-8 Package
www.DataSheet4U.com
20215702
20215703
Ordering Information
Order Number
LM5001MA
LM5001MAX
LM5001SD
LM5001SDX
LM5001SDE
Pin Descriptions
Package Type
SO-8
SO-8
LLP-8
LLP-8
LLP-8
NSC Package Drawing
M08A
M08A
SDC08A
SDC08A
SDC08A
Supplied As
95 Units in a Rail
2500 Units on Tape and Reel
1000 Units on Tape and Reel
4500 Units on Tape and Reel
250 Units on Tape and Reel
Pin
SO LLP
13
24
35
46
57
68
71
Name
SW
VIN
VCC
GND
RT
FB
COMP
Description
Application Information
Switch pin
The drain terminal of the internal power MOSFET.
Input supply pin
Nominal operating range: 3.1V to 75V.
Bias regulator output, or input for external VCC tracks VIN up to 6.9V. Above VIN = 6.9V, VCC is
bias supply
regulated to 6.9 Volts. A 0.47 µF or greater ceramic
decoupling capacitor is required. An external voltage (7V –
12V) can be applied to this pin which disables the internal
VCC regulator to reduce internal power dissipation and
improve converter efficiency.
Ground
Internal reference for the regulator control functions and the
power MOSFET current sense resistor connection.
Oscillator frequency programming and
optional synchronization pulse input
The internal oscillator is set with a resistor, between this pin
and the GND pin. The recommended frequency range is
50KHz to 1.5 MHz. The RT pin can accept synchronization
pulses from an external clock. A 100 pF capacitor is
recommended for coupling the synchronizing clock to the
RT pin.
Feedback input from the regulated output This pin is connected to the inverting input of the internal
voltage
error amplifier. The 1.26V reference is internally connected
to the non-inverting input of the error amplifier.
Open drain output of the internal error
amplifier
The loop compensation network should be connected
between the COMP pin and the FB pin. COMP pull-up is
provided by an internal 5 kresistor which may be used to
bias an opto-coupler transistor (while FB is grounded) for
isolated ground applications.
www.national.com
2


Part Number LM5001
Description High Voltage Switch Mode Regulator
Maker National Semiconductor
Total Page 18 Pages
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