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LM25576 Arkusz danych(PDF) 4 Page - Texas Instruments

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Numer części LM25576
Szczegółowy opis  SIMPLE SWITCHER 42V, 3A Step-Down Switching Regulator
Download  29 Pages
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

LM25576 Arkusz danych(HTML) 4 Page - Texas Instruments

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LM25576, LM25576-Q1
SNVS470G – JANUARY 2007 – REVISED APRIL 2013
www.ti.com
Electrical Characteristics
Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction
Temperature range. VIN = 24V, RT = 32.4kΩ unless otherwise stated.
(1)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
STARTUP REGULATOR
VccReg
Vcc Regulator Output
6.85
7.15
7.45
V
Vcc LDO Mode turn-off
9
V
Vcc Current Limit
Vcc = 0V
25
mA
VCC SUPPLY
Vcc UVLO Threshold
(Vcc increasing)
5.03
5.35
5.67
V
Vcc Undervoltage Hysteresis
0.25
V
Bias Current (Iin)
FB = 1.3V
3.4
4.5
mA
Shutdown Current (Iin)
SD = 0V
48
70
µA
SHUTDOWN THRESHOLDS
Shutdown Threshold
(SD Increasing)
0.47
0.7
0.9
V
Shutdown Hysteresis
0.1
V
Standby Threshold
(Standby Increasing)
1.17
1.225
1.28
V
Standby Hysteresis
0.1
V
SD Pull-up Current Source
5
µA
SWITCH CHARACTERSICS
Buck Switch Rds(on)
170
340
m
BOOST UVLO
3.8
V
BOOST UVLO Hysteresis
0.56
V
Pre-charge Switch Rds(on)
70
Pre-charge Switch on-time
265
ns
CURRENT LIMIT
Cycle by Cycle Current Limit
RAMP = 0V
3.6
4.2
5.1
A
Cycle by Cycle Current Limit Delay
RAMP = 2.5V
100
ns
SOFT-START
SS Current Source
7
10
14
µA
OSCILLATOR
Frequency1
180
200
220
kHz
Frequency2
RT = 11kΩ
425
485
545
kHz
SYNC Source Impedance
11
k
SYNC Sink Impedance
110
SYNC Threshold (falling)
1.3
V
SYNC Frequency
RT = 11kΩ
550
kHz
SYNC Pulse Width Minimum
15
ns
RAMP GENERATOR
Ramp Current 1
Vin = 36V, Vout=10V
136
160
184
µA
Ramp Current 2
Vin = 10V, Vout=10V
18
25
32
µA
PWM COMPARATOR
Forced Off-time
416
500
575
ns
Min On-time
80
ns
COMP to PWM Comparator Offset
0.7
V
ERROR AMPLIFIER
Feedback Voltage
Vfb = COMP
1.207
1.225
1.243
V
(1)
Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation
using Statistical Quality Control (SQC) methods. Limits are used to calculate Texas Instruments' Average Outgoing Quality Level
(AOQL).
4
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Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: LM25576 LM25576-Q1


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