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參數(shù)資料
| 型號(hào)： | MIC4575-3.3BT |
| 廠(chǎng)商： | MICREL INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 200kHz Simple 1A Buck Voltage Regulator |
| 中文描述： | 3.2 A SWITCHING REGULATOR, 220 kHz SWITCHING FREQ-MAX, SFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁(yè)數(shù)： | 5/12頁(yè) |
| 文件大?。?/td> | 213K |
| 代理商： | MIC4575-3.3BT |
MIC4575
Functional Description
The MIC4575 is a variable duty cycle switch-mode regulator
with an internal power switch. Refer to the block diagrams.
Supply Voltage
The MIC4575 operates from a +4V to +24V unregulated
input. Highest efficiency operation is from a supply voltage
around +15V.
Enable/Shutdown
The shutdown (
SHDN
) input is TTL compatible. Ground the
input if unused. A logic-low enables the regulator. A logic-
high shuts down the internal regulator which reduces the
current to typically 50
μ
A.
Feedback
Fixed versions of the regulator have an internal resistive
divider from the feedback (
FB
) pin. Connect
FB
directly to the
output line.
Adjustable versions require an external resistive voltage
divider from the output voltage to ground, connected from the
1.23V tap to
FB
.
Duty Cycle Control
A fixed-gain error amplifier compares the feedback signal
with a 1.23V bandgap voltage reference. The resulting error
amplifier output voltage is compared to a 200kHz sawtooth
waveform to produce a voltage controlled variable duty cycle
output.
Micrel
4-110
April 1998
A higher feedback voltage increases the error amplifier
output voltage. A higher error amplifier voltage (comparator
inverting input) causes the comparator to detect only the
peaks of the sawtooth, reducing the duty cycle of the com-
parator output. A lower feedback voltage increases the duty
cycle.
Output Switching
When the internal switch is on, an increasing current flows
from the supply V
IN,
through external storage inductor L1, to
output capacitor C
OUT
and the load. Energy is stored in the
inductor as the current increases with time.
When the internal switch is turned off, the collapse of the
magnetic field in L1 forces current to flow through fast
recovery diode D1, charging C
OUT
.
Output Capacitor
External output capacitor C
OUT
provides stabilization and
reduces ripple.
Return Paths
During the on portion of the cycle, the output capacitor and
load currents return to the supply ground. During the off
portion of the cycle, current is being supplied to the output
capacitor and load by storage inductor L1, which means that
D1 is part of the high-current return path.
Applications Information
The applications circuits that follow have been constructed
and tested. Refer to Application Note 15 for additional
information, including efficiency graphs and manufacturer’s
addresses and telephone numbers for most circuits.
For a mathematical approach to component selection and
circuit design, refer to Application Note 14.
C1
150μF
35V
D1
1N5819
C2
330μF
16V
L1
68μH
GND
FB
SW
MIC4575-3.3BT
V
IN
SHDN
6V to 24V
3.3V/1A
C1 Nichicon
C2 Nichicon
D1 Motorola
L1
Sumida
L1
Bi
UPL1V151MPH, ESR = 0.12
UPL1C331MPH, ESR = 0.12
1N5819
RCH106-680K, DCR = 0.22
HM77-11003, DCR = 0.233
,
Note 2
3
4
2
5
1
Figure 1. 6V–24V to 3.3V/1A Buck Converter
Through Hole
C1
150μF
35V
D1
1N5819
C2
330μF
16V
L1
68μH
GND
FB
SW
MIC4575-5.0BT
V
IN
SHDN
8V to 24V
5.0V/1A
C1 Nichicon
C2 Nichicon
D1 Motorola
L1
Sumida
L2
Bi
UPL1J151MPH, ESR = 0.12
UPL1C331MPH, ESR = 0.12
1N5819
RCH106-680K, DCR = 0.22
HM77-11003, DCR = 0.233
,
Note 2
3
4
2
5
1
Figure 2. 8V–24V to 5V/1A Buck Converter
Through Hole
C1
68μF
63V
MBR160
C2
330μF
16V
L1
150μH
GND
FB
SW
MIC4575BT
SHDN
16V to 24V
12V/1A
V
IN
R2
13.0k
1%
R1
1.50k
1%
C1 Nichicon
C2 Nichicon
D1 Motorola
L1
Sumida
UPL1J680MPH, ESR = 0.17
UPL1C331MPH, ESR = 0.12
MBR160
RCH110-151K, DCR = 0.23
5
1
4
2
3
Figure 3. 16V–24V to 12V/1A Buck Converter, Through Hole
Note 2:
Surface-
mount component.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC4575-3.3BU | 200kHz Simple 1A Buck Voltage Regulator |
| MIC4575-5.0BT | 200kHz Simple 1A Buck Voltage Regulator |
| MIC4575-5.0BU | 200kHz Simple 1A Buck Voltage Regulator |
| MIC4575BT | 200kHz Simple 1A Buck Voltage Regulator |
| MIC4575BU | 200kHz Simple 1A Buck Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC4575-5.0BT | 功能描述:IC REG BUCK 5V 1A TO220-5 RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):52kHz 電流 - 輸出:1A 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱(chēng):*LM2575HVN-12LM2575HVN-12 |
| MIC4575-5.0BU | 功能描述:IC REG BUCK 5V 1A TO263-5 RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):52kHz 電流 - 輸出:1A 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱(chēng):*LM2575HVN-12LM2575HVN-12 |
| MIC4575-5.0BU TR | 功能描述:IC REG BUCK 5V 1A TO263-5 RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):52kHz 電流 - 輸出:1A 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱(chēng):*LM2575HVN-12LM2575HVN-12 |
| MIC4575-5.0BWM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC4575-5.0WT | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 200kHz 1.0A Step-down Regulator (ROHS Compliant) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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