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LM5020MM-2 Scheda tecnica(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM5020MM-2
Spiegazioni elettronici  100V Current Mode PWM Controller
PDF  12 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5020MM-2 Scheda tecnica(HTML) 3 Page - National Semiconductor (TI)

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Pin Description
PIN
NAME
DESCRIPTION
APPLICATION INFORMATION
1
Vin
Source Input Voltage
Input to start-up regulator. Input range
13V to 100V.
2
FB
Feedback Signal
Inverting input of the internal error
amplifier. The non-inverting input is
internally connected to a 1.25V
reference.
3
COMP
The output of the error
amplifier and input to the
Pulse Width Modulator
COMP pull-up is provided by an
internal 5K resistor which may be
used to bias an opto-coupler
transistor.
4V
CC
Output of the internal high
voltage series pass regulator.
Regulated output voltage 7.7V
If an auxiliary winding raises the
voltage on this pin above the
regulation set point, the internal series
pass regulator will shutdown, reducing
the controller power dissipation.
5
OUT
Output of the PWM controller
Gate driver output with a 1A peak
current capability
6
GND
Ground return
7
UVLO
Line Under-Voltage Shutdown An external resistor divider from the
power converter source sets the
shutdown levels. The threshold of
operation equals 1.25V. Hysteresis is
set by a switched internal 20µA
current source.
8
CS
Current Sense input
Current sense input for current mode
control and over-current protection.
Current limiting is accomplished using
a dedicated current sense comparator.
If the CS comparator input exceeds
0.5V the OUT pin switches low for
cycle-by-cycle current limiting. CS is
held low for 50ns after OUT switches
high to blank leading edge current
spikes.
9
RT / SYNC
Oscillator timing resistor pin
and synchronization input
An external resistor connected from
RT to GND sets the oscillator
frequency. This pin will also accept
synchronization pulses from an
external clock.
10
SS
Softstart Input
An external capacitor and an internal
10µA current source set the soft-start
ramp rate.
www.national.com
3



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