LM2574 데이터 시트보기 (PDF) - Motorola => Freescale
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LM2574 Datasheet PDF : 24 Pages
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LM2574
Figure 1. Block Diagram and Typical Application
Typical Application (Fixed Output Voltage Versions)
Feedback
7.0 – 40 V
+Vin
Unregulated
LM2574
1
L1
330 µH
DC Input
5
Output
5.0 V Regulated
Cin
22 µF
7
2 Sig 4 Pwr 3 ON/OFF
Gnd
Gnd
D1
1N5819
Output 0.5 A Load
Cout
220 µF
Unregulated
DC Input
Cin
Representative Block Diagram and Typical Application
+Vin
5
1
Feedback
Sig Gnd
2
3.1 V Internal
Regulator
ON/OFF
R2 Fixed Gain
Error Amplifier Comparator
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
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
Pwr Gnd
4
L1
D1
Vout
Cout
Load
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
W
°C/W
Internally Limited
100
5.0
–65°C to +150°C
2.0
W
°C/W
°C/W
°C
kV
260
°C
Maximum Junction Temperature
TJ
150
°C
NOTE: ESD data available upon request.
2
MOTOROLA ANALOG IC DEVICE DATA
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