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參數資料
| 型號： | LM2574-3.3BN |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 52KHZ SIMPLE 0.5A BUCK REGULATOR |
| 中文描述： | 1.8 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數： | 20/24頁 |
| 文件大?。?/td> | 397K |
| 代理商： | LM2574-3.3BN |
LM2574
20
MOTOROLA ANALOG IC DEVICE DATA
R1
47 k
LM2574–XX
5
2
and
4
3
Gnds
Pins
ON/OFF
R2
47 k
+Vin
+Vin
C1
0.1
μ
F
Cin
22
μ
F
NOTE
: This picture does not show the complete circuit.
Figure 32. Delayed Startup Circuitry
Undervoltage Lockout
Some applications require the regulator to remain off until
the input voltage reaches a certain threshold level. Figure 33
shows an undervoltage lockout circuit applied to a buck
regulator. A version of this circuit for buck–boost converter is
shown in Figure 34. Resistor R3 pulls the ON/OFF pin high
and keeps the regulator off until the input voltage reaches a
predetermined threshold level, which is determined by the
following expression:
Vth
VZ1
1.0
R2
R1
10 k
Z1
1N5242B
R2
10 k
Q1
2N3904
R3
47 k
Cin
22
μ
F
LM2574–XX
5
2
and
4
3
Gnds
Pins
ON/OFF
+Vin
+Vin
NOTE
: This picture does not show the complete circuit.
Figure 33. Undervoltage Lockout Circuit for
Buck Converter
R2
15 k
Z1
1N5242
R1
15 k
Q1
2N3904
R3
68 k
Cin
22
μ
F
LM2574–XX
5
2
and
4
3
Gnds
Pins
ON/OFF
+Vin
+Vin
–Vout
NOTE
: This picture does not show the complete circuit (see Figure 27).
Figure 34. Undervoltage Lockout Circuit for
Buck–Boost Converter
Adjustable Output, Low–Ripple Power Supply
A 0.5 A output current capability power supply that
features an adjustable output voltage is shown in Figure 35.
This regulator delivers 0.5 A into 1.2 to 35 V output. The
input voltage ranges from roughly 3.0 to 40 V. In order to
achieve a 10 or more times reduction of output ripple, an
additional L–C filter is included in this circuit.
相關PDF資料 |
PDF描述 |
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| LM2574-12BN | 52kHz Simple 0.5A Buck Regulator |
| LM2574 | SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator |
| LM2574M-3.3LM2574M-5.0 | SIMPLE SWITCHERT 0.5A Step-Down Voltage Regulator(639.73 k) |
| LM2574M-5 | SIMPLE SWITCHERT 0.5A Step-Down Voltage Regulator(639.73 k) |
| LM2574HV | |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2574-33BWM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM2574-5 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:EASY SWITCHERE⑩ 0.5 A STEP-DOWN VOLTAGE REGULATOR |
| LM2574-5.0 WAF | 制造商:Texas Instruments 功能描述: |
| LM2574-5.0BN | 功能描述:IC REG BUCK 5V 0.5A 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關:52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應商設備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LM2574-5.0BWM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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