Datasheet

LM2575, NCV2575
http://onsemi.com
2
Figure 1. Block Diagram and Typical Application
7.0 V - 40 V
Unregulated
DC Input
L1
330 mH
GND
+V
in
1
C
in
100 mF
3ON
/OFF5
Output
2
Feedback
4
D1
1N5819
C
out
330 mF
Typical Application (Fixed Output Voltage Versions)
Representative Block Diagram and Typical Application
Unregulated
DC Input
+V
in
1
C
out
Feedback
4
C
in
L1
D1
R2
R1
1.0 k
Output
2
GND
3
ON/OFF
5
Reset
Latch
Thermal
Shutdown
52 kHz
Oscillator
1.235 V
Band-Gap
Reference
Freq
Shift
18 kHz
Comparator
Fixed Gain
Error Amplifier
Current
Limit
Driver
1.0 Amp
Switch
ON/OFF
3.1 V Internal
Regulator
Regulated
Output
V
out
Load
Output
Voltage Versions
3.3 V
5.0 V
12 V
15 V
R2
(W)
1.7 k
3.1 k
8.84 k
11.3 k
For adjustable version
R1 = open, R2 = 0 W
LM2575
5.0 V Regulated
Output 1.0 A Load
This device contains 162 active transistors.
ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.)
Rating Symbol Value Unit
Maximum Supply Voltage V
in
45 V
ON/OFF Pin Input Voltage − −0.3 V ≤ V ≤ +V
in
V
Output Voltage to Ground (Steady−State) − −1.0 V
Power Dissipation
Case 314B and 314D (TO−220, 5−Lead) P
D
Internally Limited W
Thermal Resistance, Junction−to−Ambient
R
q
JA
65 °C/W
Thermal Resistance, Junction−to−Case
R
q
JC
5.0 °C/W
Case 936A (D
2
PAK) P
D
Internally Limited W
Thermal Resistance, Junction−to−Ambient (Figure 34)
R
q
JA
70 °C/W
Thermal Resistance, Junction−to−Case
R
q
JC
5.0 °C/W
Storage Temperature Range T
stg
−65 to +150 °C
Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 kW)
− 2.0 kV
Lead Temperature (Soldering, 10 s) − 260 °C
Maximum Junction Temperature T
J
150 °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.