LM2576SX-5.0 National Semiconductor, LM2576SX-5.0 Datasheet - Page 12

• Manufacturer Part Number: LM2576SX-5.0
• Description: IC,SMPS CONTROLLER,VOLTAGE-MODE,BIPOLAR,SIP,5PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LM2576SX-5.0

• Rohs Compliant: NO

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LM2576 Series Buck Regulator Design Procedure
Given:
V
V
I
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 resis-
tor values.
R
efficient and stability with time, use 1% metal film resis-
tors)
LOAD
PROCEDURE (Adjustable Output Voltage Versions)
OUT
IN
1
(Max) = Maximum Input Voltage
can be between 1k and 5k. (For best temperature co-
(Max) = Maximum Load Current
= Regulated Output Voltage
FIGURE 7. LM2576(HV)-ADJ
12
Given:
V
V
I
F = 52 kHz
1. Programming Output Voltage (Selecting R1 and R2)
R
LOAD
OUT
IN
2
EXAMPLE (Adjustable Output Voltage Versions)
(Max) = 25V
= 1k (8.13 − 1) = 7.13k, closest 1% value is 7.15k
(Max) = 3A
= 10V
(Continued)
DS011476-13