LM2576
Figure 1. Block Diagram and Typical Application
Typical Application (Fixed Output Voltage Versions)
Feedback
4
L1
100
7.0 V – 40 V
Unregulated
DC Input
+V
in
LM2576
µ
H
Output
2
1
5.0 V Regulated
C
in
Output 3.0 A Load
D1
1N5822
100 µF
C
out
1000
3
Gnd
5
ON/OFF
µF
Representative Block Diagram and Typical Application
+V
in
ON/OFF
Unregulated
DC Input
3.1 V Internal
Regulator
Output
Voltage Versions
R2
ON/OFF
(Ω)
1
5
C
3.3 V
5.0 V
12 V
15 V
1.7 k
3.1 k
8.84 k
11.3 k
in
4
Feedback
Current
Limit
For adjustable version
R1 = open, R2 = 0
R2
Fixed Gain
Error Amplifier
Ω
Comparator
Driver
Regulated
Output
R1
1.0 k
Latch
Freq
Shift
L1
V
out
Output
18 kHz
1.0 Amp
Switch
2
Gnd
1.235 V
C
D1
out
Band–Gap
Reference
Thermal
Shutdown
52 kHz
Oscillator
3
Reset
Load
ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond
which damage to the device may occur.)
Rating
Symbol
Value
45
Unit
V
Maximum Supply Voltage
V
in
ON/OFF Pin Input Voltage
–
–0.3 V ≤ V ≤ +V
V
in
Output Voltage to Ground (Steady–State)
–
–1.0
V
Power Dissipation
Case 314B and 314D (TO–220, 5–Lead)
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
P
Internally Limited
W
D
R
R
65
5.0
°C/W
°C/W
W
θJA
θJC
2
Case 936A (D PAK)
P
D
Internally Limited
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
R
θJA
R
θJC
70
5.0
°C/W
°C/W
Storage Temperature Range
T
–65 to +150
2.0
°C
stg
Minimum ESD Rating (Human Body Model:
–
kV
C = 100 pF, R = 1.5 kΩ)
Lead Temperature (Soldering, 10 seconds)
Maximum Junction Temperature
–
260
150
°C
°C
T
J
NOTE: ESD data available upon request.
2
MOTOROLA ANALOG IC DEVICE DATA
MOTOROLA [ MOTOROLA ]
