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LM5020 Datasheet(PDF) 2 Page - Texas Instruments

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No. de pieza LM5020
Descripción Electrónicos  LM5020 100V Current Mode PWM Controller
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

LM5020 Datasheet(HTML) 2 Page - Texas Instruments

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2
3
4
5
6
7
8
9
10
FB
VCC
OUT
VIN
COMP
UVLO
GND
CS
RT/SYNC
SS
LM5020
SNVS275F – MAY 2004 – REVISED APRIL 2006
www.ti.com
Connection Diagram
Top View
Figure 2. 10-Lead VSSOP, WSON
PIN DESCRIPTIONS
Pin
Name
Description
Application Information
1
VIN
Source Input Voltage
Input to the start-up regulator. Input range is 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
COMP pull-up is provided by an internal 5K resistor which
Pulse Width Modulator
may be used to bias an opto-coupler transistor.
4
VCC
Output of the internal high voltage series pass
If an auxiliary winding raises the voltage on this pin above
regulator. Regulated output voltage is 7.7V
the regulation set point, the internal series pass regulator
will shut down, reducing the internal 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 voltage sets the shutdown levels. The threshold at
this pin is 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 pin voltage
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
An external resistor connected from RT to GND sets the
input
oscillator frequency. This pin also accepts 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.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2
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Copyright © 2004–2006, Texas Instruments Incorporated
Product Folder Links: LM5020


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