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LM2596 Datasheet(PDF) 4 Page - Estek Electronics Co. Ltd

Part # LM2596
Description  Simple high-efficiency step-down (buck) regulator
Download  12 Pages
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Manufacturer  ESTEK [Estek Electronics Co. Ltd]
Direct Link  http://www.estek.com.cn/en/index.asp
Logo ESTEK - Estek Electronics Co. Ltd

LM2596 Datasheet(HTML) 4 Page - Estek Electronics Co. Ltd

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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: VIN = 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
2
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 in2 of copper on the other side of the p-c
board.
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1)
Normalized Output Voltage
Line Regulation
Efficiency
Switch Saturation
Voltage
Switch Current Limit
Dropout Voltage
1.5
1.0
0.5
0
-0.5
-1.0
-50 -25
0
25
50 75
0
5 10 15 20 25 30 35 40
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
INPUT VOLTAGE (V)
0
5 10 15 20 25 30 35 40
65
70
75
80
85
90
95
INPUT VOLTAGE (V)
3.3V
5V
12V
20V
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
0
12
3
4
SWITCH CURRENT (A)
V =12V
IN
T=-40 C
J
0
25 C
0
125 C
0
-50 -25
0
25 50 75
5.5
5.0
4.5
4.0
3.5
V= 12V
V=5V
IN
OUT
-50 -25
0
25 50 75
1.6
1.4
1.2
1.0
0.8
0.6
I=3A
LOAD
I=1A
LOAD
4
BEIJING ESTEK ELECTRONICS CO.,LTD
LM2596
3AStep-Down VoltageRegulator


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