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LM5574QMT/NOPB Datasheet(PDF) 17 Page - Texas Instruments

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Part # LM5574QMT/NOPB
Description  Simple Switcher 75 V 0.5 A Step-Down Switching Regulator
PDF  33 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM5574QMT/NOPB Datasheet(HTML) 17 Page - Texas Instruments

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background image
FB
SW
RT
VIN
BST
SD
5V
S
R
Q
Q
AGND
IS
CLK
+
SS
PRE
3
2
10
6
5
4
7
8
11
9
12
1
SD
Ir
LM5574
SHUTDOWN
STANDBY
7V
REGULATOR
SYNC
SYNC
OSCILLATOR
RAMP
OUT
PGND
CLK
CLK
COMP
ERROR
AMP
R3
21k
C3
470p
C9
22
R6
1.65k
R5
5.11k
L1
100 2H
C7
0.022
C8
0.47
D1
CMSH2-100M
13
15
14
16
THERMAL
SHUTDOWN
UVLO
UVLO
CLK
DIS
VCC
LEVEL
SHIFT
DRIVER
1.225V
1.225V
0.7V
0.7V
R4
24.9k
C5
0.022
C6
open
R2
OPEN
C2
OPEN
C4
0.01
C1
1.0
R1
OPEN
7V ± 75V
VIN
VIN
1.4V
PWM
C_LIMIT
10 2A
5 2A
VIN
TRACK
SAMPLE
and
HOLD
2V/A
RAMP GENERATOR
Ir = (10 2A x (VIN ± VOUT))
+ 50 2A
BST
SW
VCC
IS
GND
LM5574
COUT
D1
L1
D2
VOUT
LM5574-Q1
www.ti.com
SNOSB22C – OCTOBER 2008 – REVISED OCTOBER 2014
Application Information (continued)
Figure 15. VCC Bias with Additional Winding on the Output Inductor
8.2 Typical Application
Figure 16. Typical Application Schematic
8.2.1 Design Requirements
The circuit shown in Figure 16 is configured for the following specifications:
•
VOUT = 5 V
•
VIN = 7 V to 75 V
•
Fs = 300 kHz
Copyright © 2008–2014, Texas Instruments Incorporated
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Product Folder Links: LM5574-Q1



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