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LM25574 数据表(PDF) 8 Page - Texas Instruments

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部件名 LM25574
功能描述  SIMPLE SWITCHER짰 42V, 0.5A Step-Down Switching Regulator
Download  30 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM25574 数据表(HTML) 8 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
LM25574
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 PH
C7
0.022
C8
0.47
D1
CMSH2-60M
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 ± 42V
VIN
VIN
1.4V
PWM
C_LIMIT
10 PA
5 PA
VIN
TRACK
SAMPLE
and
HOLD
2V/A
RAMP GENERATOR
Ir = (10 PA x (VIN ± VOUT))
+ 50 PA
0.1
0.2
0.3
0.4
0.5
IOUT (A)
0
10
20
30
40
50
60
70
80
90
100
VIN = 7V
VIN = 24V
LM25574
SNVS483F – JANUARY 2007 – REVISED FEBRUARY 2009
www.ti.com
Typical Performance Characteristics (continued)
Demoboard Efficiency
vs
IOUT and VIN
Typical Application Circuit and Block Diagram
Detailed Operating Description
The LM25574 switching regulator features all of the functions necessary to implement an efficient high voltage
buck regulator using a minimum of external components. This easy to use regulator integrates a 42V N-Channel
buck switch with an output current capability of 0.5 Amps. The regulator control method is based on current
mode control utilizing an emulated current ramp. Peak current mode control provides inherent line voltage feed-
forward, cycle-by-cycle current limiting, and ease of loop compensation. The use of an emulated control ramp
reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable processing of very small duty
cycles necessary in high input voltage applications. The operating frequency is user programmable from 50kHz
to 1MHz. An oscillator synchronization pin allows multiple LM25574 regulators to self synchronize or be
synchronized to an external clock. The output voltage can be set as low as 1.225V. Fault protection features
include, current limiting, thermal shutdown and remote shutdown capability. The device is available in the
TSSOP-16 package.
8
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Copyright © 2007–2009, Texas Instruments Incorporated
Product Folder Links: LM25574


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