參數(shù)資料
型號: LM2575HVS-3.3
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 穩(wěn)壓器
英文描述: SIMPLE SWITCHER 1A Step-Down Voltage Regulator
中文描述: 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSSO5
封裝: PLASTIC, TO-263, 5 PIN
文件頁數(shù): 7/12頁
文件大?。?/td> 195K
代理商: LM2575HVS-3.3
www.ti.com
APPLICATION INFORMATION
Layout Guidelines
With any switching regulator, circuit layout plays an important role in circuit performance. Wiring and parasitic
inductances, as well as stray capacitances, are subjected to rapidly switching currents, which can result in
unwanted voltage transients. To minimize inductance and ground loops, the length of the leads indicated by
heavy lines should be minimized. Optimal results can be achieved by single-point grounding (see
Figure 2
) or by
ground-plane construction. For the same reasons, the two programming resistors used in the adjustable version
should be located as close as possible to the regulator to keep the sensitive feedback wiring short.
LM2575-xx
Fixed Output
C
IN
100
μ
F
+
+V
IN
1
3
GND
5
D1
2
L1
330
μ
H
C
OUT
330
μ
F
+
4
L
O
A
D
V
OUT
V
IN
Unregulated
DC Input
C
IN
= 100
μ
F, Aluminum Electrolytic
C
OUT
= 330
μ
F, Aluminum Electrolytic
D1 = Schottky
L1 = 330
μ
H
Fixed Output Voltage Versions
LM2575
(ADJ)
C
IN
100
μ
F
+
+V
IN
1
3
GND
5
ON/OFF
D1
11DQ06
OUTPUT
2
L1
330
μ
H
C
OUT
330
μ
F
+
FEEDBACK
4
L
O
A
D
V
OUT
7-V to 60-V
Unregulated
DC Input
Adjustable Output Voltage Versions
V
OUT
= V
REF
(1 + R2/R1) = 5 V
Where,
V
REF
= 1.23 V
R1 = 2 k
R2 = 6.12 k
R2
R1
ON/OFF
OUTPUT
FEEDBACK
LM2575
1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR
SLVS569D–JANUARY 2005–REVISED JULY 2005
A.
Pin numbers are for the KTT (TO-263) package.
Figure 2. Test Circuit and Layout Guidelines
7
相關(guān)PDF資料
PDF描述
LM2575HVS-ADJ SIMPLE SWITCHER 1A Step-Down Voltage Regulator
LM2575HVN-12 SIMPLE SWITCHER 1A Step-Down Voltage Regulator
LM2575HVN-15 SIMPLE SWITCHER 1A Step-Down Voltage Regulator
LM2575HVN-5.0 SIMPLE SWITCHER 1A Step-Down Voltage Regulator
LM2575HVN-ADJ SIMPLE SWITCHER 1A Step-Down Voltage Regulator
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