LM2575 查看數據表（PDF） - HTC Korea
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LM2575 Datasheet PDF : 13 Pages
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1A, 52kHz, Step-Down Switching Regulator
LM2575
ELECTRICAL CHARACTERISTICS / Device Parameters
(Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12
V version, and Vin = 30 V for the 15 V version. ILoad = 500 mA. For typical values TJ = 25°C, for min/max
values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.)
Characteristics
Symbol Min
TYP
Max Unit
All Output Voltage Versions
Feedback Bias Current (Vout=5.0V [Adjustable Version Only])
TJ=25℃
Ib
TJ= -40 to +125℃
-
25
100 nA
-
-
200
Oscillator Frequency [Note 3]
TJ=25℃
TJ= 0 to +125℃
TJ= -40 to +125℃
Fosc
-
47
52
-
-
58
kHz
42
-
63
Saturation Voltage (Iout=1A [note 4])
TJ=25℃
TJ= -40 to +125℃
Max Duty Cycle ("0") [Note 5]
Vsat
-
-
DC
94
1.2 1.4 V
-
1.7
98
-
%
Current Limit (Peak Current [Note 3 and 4])
TJ=25℃
TJ= -40 to +125℃
ICL
4.2
5.8
6.9 A
3.5
-
7.5
Output Leakage Current [Note 6 and 7], TJ=25℃
Output = 0V
Output = -1.0V
IL
-
0.8
50 mA
-
6
30
Quiescent Current [Note 6]
TJ=25℃
TJ= -40 to +125℃
IQ
-
5
9 mA
-
-
11
Standby Quiescent Current (ON/OFF Pin = 5.0V ("off"))
TJ=25℃
ISTBY
-
TJ= -40 to +125℃
-
80
200 ㎂
-
400
ON/OFF Pin Logic Input Level (Test circuit Figure 15)
Vout=0V
TJ=25℃
TJ= -40 to +125℃
VIH
2.2
1.4
2.4
-
-
V
-
Vout=Nominal Output Voltage
TJ=25℃
TJ= -40 to +125℃
VIL
-
1.2
1
V
-
-
0.8
ON/OFF Pin Input Current (Test Circuit Figure 15)
ON/OFF Pin = 5.0V (Regulator OFF), TJ=25℃
ON/OFF Pin = 0V (Regulator ON), TJ=25℃
IIH
-
15
30 ㎂
IIL
-
0
5.0
3. The oscillator frequency reduces to approximately 18 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 dissipation of the IC by lowering the minimum duty cycle
from 5% down to approximately 2%.
4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to output pin.
5. Feedback (Pin 4) removed from output and connected to 0 V.
6. Feedback (Pin 4) removed from output and connected to +12 V for the Adjustable, 3.3 V, and 5.0V ersions,
and +25 V for the 12 V and15 V versions, to force the output transistor “off”.
7. Vin = 40 V.
−4−
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