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LM2595S-12 датащи(PDF) 4 Page - Texas Instruments

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номер детали LM2595S-12
подробное описание детали  LM2595 SIMPLE SWITCHER짰 Power Converter 150 kHz 1A Step-Down Voltage Regulator
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домашняя страница  http://www.ti.com
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LM2595
SNVS122B – MAY 1999 – REVISED APRIL 2013
www.ti.com
LM2595-12 Electrical Characteristics (continued)
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating
Temperature Range.
Symbol
Parameter
Conditions
LM2595-12
Units
(Limits)
Typ
Limit
(1)
(2)
η
Efficiency
VIN = 25V, ILOAD = 1A
90
%
LM2595-ADJ Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating
Temperature Range.
Symbol
Parameter
Conditions
LM2595-ADJ
Units
(Limits)
Typ
Limit
(1)
(2)
SYSTEM PARAMETERS (3) Test Circuit Figure 21
VFB
Feedback Voltage
4.5V
≤ VIN ≤ 40V, 0.1A ≤ ILOAD ≤ 1A
1.230
V
VOUT programmed for 3V. Circuit of Figure 21
1.193/1.180
V(min)
1.267/1.280
V(max)
η
Efficiency
VIN = 12V, VOUT = 3V, ILOAD = 1A
78
%
(1)
Typical numbers are at 25°C and represent the most likely norm.
(2)
All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits
are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3)
External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect
switching regulator system performance. When the LM2595 is used as shown in the Figure 21 test circuit, system performance will be
as shown in system parameters of Electrical Characteristics section.
All Output Voltage Versions Electrical Characteristics
Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating
Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the
12V version. ILOAD = 200 mA.
Symbol
Parameter
Conditions
LM2595-XX
Units
(Limits)
Typ
Limit
(1)
(2)
DEVICE PARAMETERS
Ib
Feedback Bias Current
Adjustable Version Only,VFB = 1.3V
10
nA
50/100
nA (max)
fO
Oscillator Frequency
See (3)
150
kHz
127/110
kHz(min)
173/173
kHz(max)
VSAT
Saturation Voltage
IOUT = 1A
(4) (5)
1
V
1.2/1.3
V(max)
DC
Max Duty Cycle (ON)
See (5)
100
%
Min Duty Cycle (OFF)
See (6)
0
(1)
Typical numbers are at 25°C and represent the most likely norm.
(2)
All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits
are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control
(SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
(3)
The switching frequency is reduced when the second stage current limit is activated. The amount of reduction is determined by the
severity of current overload.
(4)
No diode, inductor or capacitor connected to output pin.
(5)
Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
(6)
Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force
the output transistor switch OFF.
4
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Copyright © 1999–2013, Texas Instruments Incorporated
Product Folder Links: LM2595


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