LM2575 查看數據表（PDF） - First Components International
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LM2575 Datasheet PDF : 10 Pages
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LM2575 1.0A Step - Down Voltage Switching Regulators
ELECTRICAL CHARACTERISTICS: All Output Voltage Versions
(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, 5.0V and ADJ version, VIN= 25V for 12V version. and VIN= 30V for 15V version. ILOAD = 500 mA)
Parameter
Conditions
Symbol Min
Typ
Max Unit
Feedback Bias Current
Oscillator Frequency
Saturation Voltage
Max Duty Cycle (ON)
Current Limit
Output Leakage Current
VOUT = 5V (Adjustable Version Only)
(Note 11)
IOUT = 1A (Notes 4)
(Note 5)
(Note 4, 11)
(Notes 6, 7) Output = 0 V
Output = -1V
IFB
-
50
100 / 500
nA
FO
47 / 42
52
58 / 63
kHz
VSAT
-
0.9
1.2 / 1.4
V
TDC
93
98
-
%
ICL
1.7 / 1.3
2.2
3.0 / 3.2
A
IOL
-
-
2
-
7.5
30
mA
Quiescent Current
(Note 6)
Standby Quiescent Current
ON/OFF Pin = 5V (OFF)
Thermal Resistance
TO-220 Package, Junction to Ambient (Note 8)
TO-220 Package, Junction to Ambient (Note 8)
TO-220,TO-263, Package, Junction to Case
TO-252 Package, Junction to Case
TO-263 Package, Junction to Ambient (Note 10)
ON/OFF Pin
VOUT=0V
Logic Input Level
VOUT = Nominal Output Voltage
ON/OFF Pin Input Current
ON/OFF Pin = 5V (OFF)
ON/OFF Pin = 0V (ON)
IQ
-
5
10
mA
ISTBY
-
50
200
mA
qJA
-
65
-
qJA
-
45
-
qJC
-
2
-
°C/W
qJC
-
6
-
qJA
-
37
VIH
2.2 / 2.4
1.4
-
V
VIL
-
1.2
1.0 / 0.8
V
VIH
-
12
30
mA
IIL
-
0
10
mA
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indic
ate conditions for which the device is intended to be functional, but do not guarantee specific performance limits.
Guaranteed specifications and Test conditions are shown in Electrical Characteristics.
Note 2: All limits guaranteed at 25°C (standard type face) and over full operating temperature range (bold type face).
All 25°C limits are 100% production tested. All limits over full operating temperature range are guaranteed via
correlation using standard Statistics Quality Control methods.
Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator
system performance. When the LM2575 is used as show in the Figure 2 test circuit, system performance will be
as shown in system parameters section of Electrical Characteristics.
Note 4: Output pin sourcing current. No diode, inductor or capacitor connected to output.
Note 5: Feedback pin removed from output and connected to 0V.
Note 6: Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for
the 12V and 15V versions, to force the output transistor OFF.
Note 7: VIN = 40V
Note 8: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically,
with ½ inch leads in a socket, or on a PC board with minimum copper area.
Note 9: Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically,
with ¼ inch leads soldered to a PC board containing approximately 4 square inches of copper area surrounding
the leads.
Note 10: If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board Copper area
thermally connected to the package. Using 0.5 square inches of copper area, qJA is 50°C//W, with 1 square inch
of copper area, qJA is 37°C/W, and with 1.6 or more square inches of copper area, qJA is 32°C/W.
Note 11: The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an Overload which
causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self-
protection feature lowers the Average power dissipation of LM2575 By lowering the minimum duty cycle from
5% down to approximately 2%.
5
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