LM2575, NCV2575
Typical Application
(Fixed Output Voltage Versions)
Feedback
7.0 V - 40 V
Unregulated
DC Input
+V
in
C
in
100
mF
1
3 GND 5
LM2575
4
Output
2
ON/OFF
L1
330
mH
D1
1N5819
5.0 V Regulated
Output 1.0 A Load
C
out
330
mF
Representative Block Diagram and Typical Application
Unregulated
DC Input
C
in
4
Feedback
R2
Fixed Gain
Error Amplifier Comparator
Current
Limit
+V
in
1
3.1 V Internal
Regulator
ON/OFF
ON/OFF
5
Output
Voltage Versions
3.3 V
5.0 V
12 V
15 V
For adjustable version
R1 = open, R2 = 0
W
R2
(W)
1.7 k
3.1 k
8.84 k
11.3 k
R1
1.0 k
Driver
Freq
Shift
18 kHz
52 kHz
Oscillator
Latch
Output
1.0 Amp
Switch
Reset
Thermal
Shutdown
2
GND
3
D1
L1
Regulated
Output
V
out
C
out
Load
1.235 V
Band-Gap
Reference
This device contains 162 active transistors.
Figure 1. Block Diagram and Typical Application
ABSOLUTE MAXIMUM RATINGS
(Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)
Rating
Maximum Supply Voltage
ON/OFF Pin Input Voltage
Output Voltage to Ground (Steady−State)
Power Dissipation
Case 314B and 314D (TO−220, 5−Lead)
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Case 936A (D
2
PAK)
Thermal Resistance, Junction−to−Ambient (Figure 34)
Thermal Resistance, Junction−to−Case
Storage Temperature Range
Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 kW)
Lead Temperature (Soldering, 10 s)
Maximum Junction Temperature
Symbol
V
in
−
−
P
D
R
qJA
R
qJC
P
D
R
qJA
R
qJC
T
stg
−
−
T
J
Value
45
−0.3
V
≤
V
≤
+V
in
−1.0
Internally Limited
65
5.0
Internally Limited
70
5.0
−65
to +150
2.0
260
150
Unit
V
V
V
W
°C/W
°C/W
W
°C/W
°C/W
°C
kV
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
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