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參數(shù)資料
| 型號： | LM2596 |
| 廠商： | National Semiconductor, Corp. |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SIMPLE SWITCHER Power Converter 150 KHz 3A Step-Down Voltage Regulator |
| 中文描述： | SIMPLE SWITCHER系列電源轉換器,150KHz，3A降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 5/31頁 |
| 文件大?。?/td> | 736K |
| 代理商： | LM2596 |
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All Output Voltage Versions
Electrical Characteristics
(Continued)
Specifications with standard type face are for T
= 25C, and those with
boldface type
apply over
full Operating Tempera-
ture Range
. Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable version and V
IN
= 24V for the 12V ver-
sion. I
LOAD
= 500 mA
Symbol
Parameter
Conditions
LM2596-XX
Typ
(Note 3)
5
Units
(Limits)
Limit
(Note 4)
I
H
ON /OFF Pin Input Current
V
LOGIC
= 2.5V (Regulator OFF)
μA
15
μA(max)
μA
μA(max)
I
L
V
LOGIC
= 0.5V (Regulator ON)
0.02
5
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2:
The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Note 3:
Typical numbers are at 25C and represent the most likely norm.
Note 4:
All limits guaranteed 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 guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to
calculate Average Outgoing Quality Level (AOQL).
Note 5:
External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator
system performance. When the LM2596 is used as shown in the Figure 1test circuit, system performance will be as shown in system parameters section of Electrical
Characteristics.
Note 6:
The switching frequency is reduced when the second stage current limit is activated.
Note 7:
No diode, inductor or capacitor connected to output pin.
Note 8:
Feedback pin removed from output and connected to 0V to force the output transistor switch ON.
Note 9:
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.
Note 10:
V
IN
= 40V.
Note 11:
Junction to ambient thermal resistance (no external heat sink) for the TO-220 package mounted vertically, with the leads soldered to a printed circuit board
with (1 oz.) copper area of approximately 1 in
.
Note 12:
Junction to ambient thermal resistance with the TO-263 package tab soldered to a single printed circuit board with 0.5 in
2
of (1 oz.) copper area.
Note 13:
Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in
2
of (1 oz.) copper area.
Note 14:
Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in
2
of (1 oz.) copper area on
the LM2596S side of the board, and approximately 16 in
of copper on the other side of the p-c board. See Application Information in this data sheet and the thermal
model in Switchers Made Simple
version 4.3 software.
Typical Performance Characteristics
(Circuit of Figure 1)
Normalized
Output Voltage
Line Regulation
Efficiency
01258304
01258305
01258306
L
www.national.com
5
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