LM2576 Series
Block Diagram
VIN
ON/OFF
INTERNAL
REGULATOR
UNREGULATED
DCINPUT
1
4
ON/OFF
5
+
CIN
FIXED GAIN
ERRORAMP
FEED-
BACK
R2
3 AMP
DRIVER
SWITCH
COMPARATOR
+
-
+
-
R1
1.0k
OUTPUT
L1
VOUT
2
3
+
L
O
A
D1
COUT
1.23V
BAND-GAP
REFERENCE
52kHZ
OSCILLATOR
D
THERMAL
SHUTDOWN
CURRENT
LIMIT
RESET
GND
3.3V, R2 =1.7K
5V, R2 = 3.1K
12V, R2 = 8.84K
15V, R2 =11.3K
For ADJ, Version
R1 = Open, R2 =0Ω
Ordering information
Temperature
Output Voltage, V
12
Package Type
Range
3.3
5.0
15
ADJ
-40°C ≤ TA
≤ 125°C
TO-263
TO-220
LM2576SX-3.3
LM2576SX-5.0
LM2576T-5.0
LM2576SX-12
LM2576T-12
LM2576SX-15 LM2576SX-ADJ
LM2576T-15 LM2576T-ADJ
LM2576T-3.3
TIGER ELECTRONICS CO.,LTD
2