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參數(shù)資料
| 型號： | TL2575-33I |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS |
| 中文描述： | 1，一個簡單的步驟式開關穩(wěn)壓器 |
| 文件頁數(shù)： | 17/31頁 |
| 文件大?。?/td> | 923K |
| 代理商： | TL2575-33I |
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BUCK REGULATOR DESIGN PROCEDURE
TL2575, TL2575HV
1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS
SLVS638B–MAY 2006–REVISED JANUARY 2007
PROCEDURE (Fixed Output)
EXAMPLE (Fixed Output)
Known:
V
OUT
= 3.3 V, 5 V, 12 V, or 15 V
V
IN(Max)
= Maximum input voltage
I
LOAD(Max)
= Maximum load current
Known:
V
OUT
= 5 V
V
IN(Max)
= 20 V
I
LOAD(Max)
= 1 A
1. Inductor Selection (L1)
1. Inductor Selection (L1)
A.
From
Figure 15
through
Figure 18
, select the appropriate inductor
A.
From
Figure 16
(TL2575-05), the intersection of 20-V line and
code based on the intersection of V
IN(Max)
and I
LOAD(Max)
.
1-A line gives an inductor code of L330.
B.
From
Table 2
, choose the appropriate inductor based on the
inductor code. Parts from three well-known inductor manufacturers
are given. The inductor chosen should be rated for operation at
52-kHz and have a current rating of at least 1.15
×
I
to
allow for the ripple current. The actual peak current in L1 (in normal
operation) can be calculated as follows:
I
L1(pk)
= I
LOAD(Max)
+ (V
IN
– V
OUT
)
×
t
on
/2L1
Where t
on
= V
OUT
/V
IN
×
(1/f
osc
)
B.
L330
→
L1 = 330
μ
H
Choose from:
34042 (Schott)
PE-52627 (Pulse Engineering)
RL1952 (Renco)
2. Output Capacitor Selection (C
OUT
)
2. Output Capacitor Selection (C
OUT
)
A.
The TL2575 control loop has a two-pole two-zero frequency
response. The dominant pole-zero pair is established by C
and
L1. To meet stability requirements while maintaining an acceptable
output ripple voltage (V
≈
0.01
×
V
OUT
), the recommended range
for a standard aluminum electrolytic C
OUT
is between 100
μ
F and
470
μ
F.
A.
C
OUT
= 100-
μ
F to 470-
μ
F, standard aluminum electrolytic
B.
C
should have a voltage rating of at least 1.5
×
V
. But if a
low output ripple voltage is desired, choose capacitors with a
higher-voltage ratings than the minimum required, due to their
typically lower ESRs.
B.
Although a C
rated at 8 V is sufficient for V
= 5 V, a
higher-voltage capacitor is chosen for its typically lower ESR (and
hence lower output ripple voltage)
→
Capacitor voltage
rating = 20 V.
3. Catch Diode Selection (D1) (see
Table 1
)
3. Catch Diode Selection (D1) (see
Table 1
)
A.
In normal operation, the catch diode requires a current rating of
at least 1.2
×
I
. For the most robust design, D1 should be
rated to handle a current equal to the TL2575 maximum switch peak
current; this represents the worst-case scenario of a continuous
short at V
OUT
.
A.
Pick a diode with 3-A rating.
B.
The diode requires a reverse voltage rating of at least
1.25
×
V
IN(Max)
.
B.
Pick 30-V rated Schottky diode (1N5821, MBR330, 31QD03, or
SR303) or 100-V rated Fast Recovery diode (31DF1, MURD310, or
HER302).
4. Input Capacitor (C
IN
)
An aluminum electrolytic or tantalum capacitor is needed for input
bypassing. Locate C
IN
as close to the V
IN
and GND pins as
possible.
4. Input Capacitor (C
IN
)
C
IN
= 100
μ
F, 25 V, aluminum electrolytic
17
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相關代理商/技術參數(shù) |
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|---|---|
| TL2575-33IKTTR | 功能描述:直流/直流開關調節(jié)器 1-A Step-Down Vltge RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TL2575-33IKTTR | 制造商:Texas Instruments 功能描述:DC/DC Converter IC 制造商:Texas Instruments 功能描述:IC, STEP-DOWN REGULATOR, D2PAK-5 |
| TL2575-33IKTTRG3 | 功能描述:直流/直流開關調節(jié)器 1A Simple Step-Down Switching Vltg Regs RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TL2575-33IKV | 功能描述:直流/直流開關調節(jié)器 1-A Step-Down Vltge RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TL2575-33IKV | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
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