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LM2576
http://onsemi.com
2
Figure 1. Block Diagram and Typical Application
7.0 V 40 V
Unregulated
DC Input
L1
100
mH
GN
D
+Vin
1
Cin
100
mF
3ON/OFF
5
Output
2
Feedback
4
D1
1N5822
Cout
1000
mF
Typical Application (Fixed Output Voltage Versions)
Representative Block Diagram and Typical Application
Unregulated
DC Input
+Vin
1
Cout
Feedback
4
Cin
L1
D1
R2
R1
1.0 k
Output
2
GND
3
ON/OFF
5
Reset
Latch
Thermal
Shutdown
52 kHz
Oscillator
1.235 V
BandGap
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
Vout
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
LM2576
5.0 V Regulated
Output 3.0 A Load
This device contains 162 active transistors.
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Maximum Supply Voltage
Vin
45
V
ON/OFF Pin Input Voltage
0.3 V
≤ V ≤ +Vin
V
Output Voltage to Ground (SteadyState)
1.0
V
Power Dissipation
Case 314B and 314D (TO220, 5Lead)
PD
Internally Limited
W
Thermal Resistance, JunctiontoAmbient
RqJA
65
°C/W
Thermal Resistance, JunctiontoCase
RqJC
5.0
°C/W
Case 936A (D2PAK)
PD
Internally Limited
W
Thermal Resistance, JunctiontoAmbient
RqJA
70
°C/W
Thermal Resistance, JunctiontoCase
RqJC
5.0
°C/W
Storage Temperature Range
Tstg
65 to +150
°C
Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 k
W)
2.0
kV
Lead Temperature (Soldering, 10 seconds)
260
°C
Maximum Junction Temperature
TJ
150
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
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