LM2574N 데이터 시트보기 (PDF) - ON Semiconductor
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LM2574N Datasheet PDF : 28 Pages
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Unregulated
DC Input
Cin
LM2574
Typical Application (Fixed Output Voltage Versions)
7.0 - 40 V
Unregulated
DC Input
Cin
22 µF
Feedback
+Vin
LM2574
(3) 1
L1
330 µH
5
Output
(12)
(14) 7
D1
2 Sig 4 Pwr 3 ON/OFF 1N5819
Gnd
Gnd
(4)
(6)
(5)
Cout
220 µF
5.0 V Regulated
Output 0.5 A Load
Representative Block Diagram and Typical Application
+Vin
5 (12)
3.1 V Internal
Regulator
ON/OFF
1
Feedback
(3)
R2
Fixed Gain
Error Amplifier Comparator
Sig Gnd
2
(4)
R1
1.0 k Freq
Shift
18 kHz
1.235 V
Band-Gap
Reference
52 kHz
Oscillator
Current
Limit
Latch
Reset
Driver
1.0 Amp
Switch
Thermal
Shutdown
ON/OFF
3
(5)
Output
R2
Voltage Versions
(Ω)
3.3 V
1.7 k
5.0 V
3.1 k
12 V
8.84 k
15 V
11.3 k
For adjustable version
R1 = open, R2 = 0 Ω
Output
7 (14)
Pwr Gnd
4
(6)
L1
Vout
D1
Cout
Load
NOTE: Pin numbers in ( ) are for the SO–16W package.
Figure 1. Block Diagram and Typical Application
ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur).
Rating
Symbol
Value
Unit
Maximum Supply Voltage
ON/OFF Pin Input Voltage
Output Voltage to Ground (Steady State)
Vin
45
V
–
–0.3 V ≤ V ≤ +Vin
V
–
–1.0
V
DW Suffix, Plastic Package Case 751G
Max Power Dissipation
Thermal Resistance, Junction–to–Air
N Suffix, Plastic Package Case 626
Max Power Dissipation
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
Storage Temperature Range
Minimum ESD Rating
(Human Body Model: C = 100 pF, R = 1.5 kΩ)
Lead Temperature (Soldering, 10 seconds)
PD
RθJA
PD
RθJA
RθJC
Tstg
–
–
Internally Limited
145
Internally Limited
100
5.0
–65°C to +150°C
2.0
260
W
°C/W
W
°C/W
°C/W
°C
kV
°C
Maximum Junction Temperature
NOTE: ESD data available upon request.
TJ
150
°C
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