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LM2574 Arkusz danych(PDF) 3 Page - Texas Instruments

Numer części LM2574
Szczegółowy opis  SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

LM2574 Arkusz danych(HTML) 3 Page - Texas Instruments

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1
NC
14
NC
2
NC
13
NC
3
FB
12
OUTPUT
4
SIG_GND
11
NC
5
ON/OFF
10
V
IN
6
PWR_GND
9
NC
7
NC
8
NC
1
FB
8
NC
2
SIG_GND
7
OUTPUT
3
ON/OFF
6
NC
4
PWR_GND
5
V
IN
3
LM2574, LM2574HV
www.ti.com
SNVS104D – JUNE 1999 – REVISED APRIL 2016
Product Folder Links: LM2574 LM2574HV
Submit Documentation Feedback
Copyright © 1999–2016, Texas Instruments Incorporated
5 Pin Configuration and Functions
P Package
8-Pin PDIP
Top View
NPA Package
14-Pin SOIC
Top View
Pin Functions
PIN
I/O
DESCRIPTION
NAME
PDIP
SOIC
FB
1
3
I
Feedback sense input pin. Connect to the midpoint of feedback divider to set
VOUT for ADJ version or connect this pin directly to the output capacitor for a
fixed output version.
NC
8, 6
1, 2, 7, 8, 9,
11, 13, 14
No internal connection, but must be soldered to PCB for best heat transfer.
ON/OFF
3
5
I
Enable input to the voltage regulator. High = OFF and low = ON. Connect to
GND to enable the voltage regulator. Do not leave this pin float.
OUTPUT
7
12
O
Emitter pin of the power transistor. This is a switching node. Attached this pin
to an inductor and the cathode of the external diode.
PWR_GND
4
6
Power ground pins. Connect to system ground and SIF GND, ground pins of
CIN and COUT. Path to CIN must be as short as possible.
SIG_GND
2
4
Signal ground pin. Ground reference for internal references and logic. Connect
to system ground.
VIN
5
10
I
Supply input pin to collector pin of high-side transistor. Connect to power
supply and input bypass capacitors CIN. Path from VIN pin to high frequency
bypass CIN and PWR GND must be as short as possible.


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