參數(shù)資料
型號(hào): LM2576-ADJ
廠商: Motorola, Inc.
英文描述: Easy Switcher 3.0A Step-Down Voltage Regulator
中文描述: 輕松切換3.0A的降壓穩(wěn)壓器
文件頁(yè)數(shù): 8/28頁(yè)
文件大?。?/td> 301K
代理商: LM2576-ADJ
LM2576
8
MOTOROLA ANALOG IC DEVICE DATA
Figure 15. Typical Test Circuit
D1
MBR360
L1
100
μ
H
Output
2
4
Feedback
Cout
1000
μ
F
Cin
100
μ
F
LM2576
Fixed Output
1
5
3
ON/OFF
Gnd
Vin
Load
Vout
D1
MBR360
L1
100
μ
H
Output
2
4
Feedback
Cout
1000
μ
F
Cin
100
μ
F
LM2576
Adjustable
1
5
3
ON/OFF
Gnd
Vin
Load
Vout
5,000 V
Fixed Output Voltage Versions
Adjustable Output Voltage Versions
Vout
Vref
1.0
R2
R1
R2
R1
Vout
Vref
– 1.0
Where Vref = 1.23 V, R1
between 1.0 k and 5.0 k
R2
R1
Cin
Cout–
D1
L1
R1
R2
100
μ
F, 75 V, Aluminium Electrolytic
1000
μ
F, 25 V, Aluminium Electrolytic
Schottky, MBR360
100
μ
H, Pulse Eng. PE–92108
2.0 k, 0.1%
6.12 k, 0.1%
7.0 V – 40 V
Unregulated
DC Input
7.0 V – 40 V
Unregulated
DC Input
PCB LAYOUT GUIDELINES
As in any switching regulator, the layout of the printed
circuit board is very important. Rapidly switching currents
associated with wiring inductance, stray capacitance and
parasitic inductance of the printed circuit board traces can
generate voltage transients which can generate
electromagnetic interferences (EMI) and affect the desired
operation. As indicated in the Figure 15, to minimize
inductance and ground loops, the length of the leads
indicated by heavy lines should be kept as short as possible.
For best results, single–point grounding (as indicated) or
ground plane construction should be used.
On the other hand, the PCB area connected to the Pin 2
(emitter of the internal switch) of the LM2576 should be kept
to a minimum in order to minimize coupling to sensitive
circuitry.
Another sensitive part of the circuit is the feedback. It is
important to keep the sensitive feedback wiring short. To
assure this, physically locate the programming resistors near
to the regulator, when using the adjustable version of the
LM2576 regulator.
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