lm2595sx-adj National Semiconductor Corporation, lm2595sx-adj Datasheet - Page 5

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lm2595sx-adj

Manufacturer Part Number
lm2595sx-adj
Description
Simple Switcher Power Converter 150 Khz 1a Step-down Voltage Regulator
Manufacturer
National Semiconductor Corporation
Datasheet

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0
Symbol
ON/OFF CONTROL Test Circuit Figure 1
I
I
H
L
All Output Voltage Versions
Electrical Characteristics
Specifications with standard type face are for T
ture Range. Unless otherwise specified, V
sion. I
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended 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 25˚C 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% produc-
tion 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 sys-
tem performance. When the LM2595 is used as shown in the Figure 1 test 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. The amount of reduction is determined by the severity of current over-
load.
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
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
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
Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in
the LM2595S side of the board, and approximately 16 in
model in Switchers Made Simple
Typical Performance Characteristics
Normalized
Output Voltage
LOAD
IN
ON/OFF Pin
Input Current
= 40V.
= 200 mA.
Parameter
®
DS012565-11
version 4.3 software.
2
.
V
V
LOGIC
LOGIC
IN
(Continued)
2
Line Regulation
of copper on the other side of the p-c board. See Application Information in this data sheet and the thermal
= 12V for the 3.3V, 5V, and Adjustable version and V
J
= 2.5V (Regulator OFF)
= 0.5V (Regulator ON)
= 25˚C, and those with boldface type apply over full Operating Tempera-
Conditions
(Circuit of Figure 1 )
5
DS012565-12
Efficiency
(Note 3)
0.02
Typ
5
LM2595-XX
IN
= 24V for the 12V ver-
2
of (1 oz.) copper area.
2
(Note 4)
2
of (1 oz.) copper area on
Limit
of (1 oz.) copper area.
15
5
www.national.com
DS012565-13
µA(max)
µA(max)
(Limits)
Units
µA
µA

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