LM2576S-3.3 National Semiconductor, LM2576S-3.3 Datasheet - Page 13

• Manufacturer Part Number: LM2576S-3.3
• Description: IC, STEP-DOWN VOLTAGE REGULATOR, TO-263
• Manufacturer: National Semiconductor

Specifications of LM2576S-3.3

• Primary Input Voltage: 12V
• No. Of Outputs: 1
• Output Voltage: 3.3V
• Output Current: 3A
• No. Of Pins: 5
• Operating Temperature Range: -40°C To +125°C
• Supply Voltage Range: 4V To 40V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LM2576 Series Buck Regulator Design Procedure
Given: V
Maximum Input Voltage I
Current F = Switching Frequency (Fixed at 52 kHz)
1. Programming Output Voltage (Selecting R1 and R2,
as shown in Figure 2) Use the following formula to select
the appropriate resistor values.
coefficient and stability with time, use 1% metal film resis-
tors)
PROCEDURE (Adjustable Output Voltage Versions)
R
1
can be between 1k and 5k. (For best temperature
OUT
= Regulated Output Voltage V
LOAD
(Max) = Maximum Load
IN
(Max) =
FIGURE 7. LM2576(HV)-ADJ
13
Given: V
52 kHz
1. Programming Output Voltage (Selecting R1 and R2)
R
2
EXAMPLE (Adjustable Output Voltage Versions)
= 1k (8.13 − 1) = 7.13k, closest 1% value is 7.15k
OUT
= 10V V
(Continued)
01147613
IN
(Max) = 25V I
LOAD
(Max) = 3A F =
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