LM2576
Figure 1. Block Diagram and Typical Application
Typical Application
(Fixed Output Voltage Versions)
Feedback
7.0 V – 40 V
Unregulated
DC Input
+Vin
Cin
100
µF
1
3 Gnd 5
LM2576
4
Output
2
ON/OFF
L1
100
µH
D1
1N5822
5.0 V Regulated
Output 3.0 A Load
Cout
1000
µF
Representative Block Diagram and Typical Application
+Vin
1
Cin
4
Feedback
R2
Fixed Gain
Error Amplifier Comparator
Current
Limit
Unregulated
DC Input
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
Ω
R2
(Ω)
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
Vout
Cout
Load
1.235 V
Band–Gap
Reference
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 (D2PAK)
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)
Maximum Junction Temperature
NOTE:
ESD data available upon request.
Symbol
Vin
–
–
PD
R
θJA
R
θJC
PD
R
θJA
R
θJC
Tstg
–
–
TJ
Value
45
–0.3 V
≤
V
≤
+Vin
–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
2
MOTOROLA ANALOG IC DEVICE DATA
MOTOROLA [ MOTOROLA, INC ]
