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LM2575-5.0BU Arkusz danych(PDF) 5 Page - Micrel Semiconductor

Numer części LM2575-5.0BU
Szczegółowy opis  52kHz Simple 1A Buck Regulator
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Producent  MICREL [Micrel Semiconductor]
Strona internetowa  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

LM2575-5.0BU Arkusz danych(HTML) 5 Page - Micrel Semiconductor

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April 2005
5
M9999-042205
LM2575
Micrel, Inc.
Typical Performance Characteristics
Normalized
Feedback Voltage*
JUNCTION TEMPERATURE (˚C)
25
20
15
10
5
0
-5
-10
-15
-20
-25
-75 -50 -25 0
25 50 75 100 125 150
VIN = 12V
ILOAD = 200mA
Normalized to TJ = 25˚C
Feedback Voltage
vs Duty Cycle*
DUTY CYCLE (%)
20
15
10
5
0
-5
-10
-15
-20
ILOAD = 200 mA
VIN = 40V
VIN = 7V
0
20
40
60
80
100
* Adjustable version only
LM2575
Units
Symbol
Parameter
Conditions
Typ
Limit
(Limits)
(Note 2)
ON/OFF CONTROL, FIXED and ADJUSTABLE REGULATORS Test Circuit Figure 1
V
IH
ON/OFF Pin Logic
V
OUT = 0V
1.4
2.2/2.4
V(min)
V
IL
Input Level
V
OUT = 5V
1.2
1.0/0.8
V(max)
I
IH
ON /OFF Pin Logic
ON /OFF Pin = 5V (OFF)
4
µA
Current
30
µA(max)
I
IL
ON/OFF Pin = 0V (ON)
0.01
µA
10
µA(max)
Note 1:
Absolute Maximum Rating 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:
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 extreme are guaranteed via testing.
Note 3:
External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the
LM2575/LM1575 is used as shown in Figure 1 test circuit, system performance will be shown in system parameters section of Electrical
Characteristics.
Note 4:
Output (pin 2) sourcing current. No diode, inductor or capacitor connected to output.
Note 5:
Feedback (pin 4) removed from output and connected to 0V.
Note 6:
Feedback (pin 4) removed from output and connected to 12V to force the output transistor OFF.
Note 7:
Junction to ambient thermal resistance (no external heat sink) for the 5-lead TO-220 package mounted vertically, with 1/2" leads in a socket, or
on PC board with minimum copper area.
Note 8:
Junction to ambient thermal resistance (no external heat sink) for the 5-lead TO-220 package mounted vertically, with 1/4" leads soldered to PC
board containing approximately 4 square inches of copper area surrounding the leads.
Note 9:
Junction to ambient thermal resistance with approximately 1 square inch of pc board copper surrounding the leads. Additional copper will lower
thermal resistance further.


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