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参数资料
| 型号： | LM2575TV-15 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 52 kHz SWITCHING FREQ-MAX, PZFM5 |
| 封装： | 314B-05 |
| 文件页数： | 11/28页 |
| 文件大小： | 380K |
| 代理商： | LM2575TV-15 |
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LM2575
19
MOTOROLA ANALOG IC DEVICE DATA
Figure 26. Inverting Buck–Boost
Regulator with Delayed Startup
D1
1N5819
L1
100
H
Output
2
4
Feedback
Unregulated
DC Input
12 V to 25 V
Cin
100
F
/50 V
1
3
5ON/OFF
Gnd
+Vin
Regulated
Output
–12 V @ 0.35 A
Cout
1800
F
/16 V
LM2575–12
C1
0.1
F
R1
47 k
R2
47 k
It has been already mentioned above, that in some
situations, the delayed startup or the undervoltage lockout
features could be very useful. A delayed startup circuit
applied to a buck–boost converter is shown in Figure 26.
Figure 32 in the “Undervoltage Lockout” section describes an
undervoltage lockout feature for the same converter
topology.
Figure 27. Inverting Buck–Boost Regulator Shut Down
Circuit Using an Optocoupler
LM2575–XX
1
3
5
Gnd
ON/OFF
+Vin
R2
47 k
Cin
100
F
NOTE:
This picture does not show the complete circuit.
R1
47 k
R3
470
Shutdown
Input
MOC8101
–Vout
Off
On
5.0 V
0
+Vin
With the inverting configuration, the use of the ON/OFF pin
requires some level shifting techniques. This is caused by the
fact, that the ground pin of the converter IC is no longer at
ground. Now, the ON/OFF pin threshold voltage (1.4 V
approximately) has to be related to the negative output
voltage level. There are many different possible shut down
methods, two of them are shown in Figures 27 and 28.
Figure 28. Inverting Buck–Boost Regulator Shut Down
Circuit Using a PNP Transistor
NOTE:
This picture does not show the complete circuit.
R2
5.6 k
Q1
2N3906
LM2575–XX
1
3
5
Gnd
ON/OFF
R1
12 k
–Vout
+Vin
Shutdown
Input
Off
On
+V
0
+Vin
Cin
100
F
Negative Boost Regulator
This example is a variation of the buck–boost topology and
is called a negative boost regulator. This regulator
experiences relatively high switch current, especially at low
input voltages. The internal switch current limiting results in
lower output load current capability.
The circuit in Figure 29 shows the negative boost
configuration. The input voltage in this application ranges
from –5.0 V to –12 V and provides a regulated –12 V output.
If the input voltage is greater than –12 V, the output will rise
above –12 V accordingly, but will not damage the regulator.
Figure 29. Negative Boost Regulator
1N5817
150
H
Output
2
4
Feedback
Regulated
Output
Vout = –12 V
Load Current from
200 mA for Vin = –5.2 V
to 500 mA for Vin = –7.0 V
Unregulated
DC Input
–Vin = –5.0 V to –12 V
L1
D1
Cout
1000
F
/16 V
Cin
100
F
/50 V
LM2575–12
1
5
3
ON/OFF
Gnd
+Vin
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2575TV-15G | 功能描述:直流/直流开关调节器 15V 1A Buck PWM RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2575TV-3.3 | 功能描述:直流/直流开关调节器 3.3V 1A Buck PWM RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2575TV-3.3G | 功能描述:直流/直流开关调节器 3.3V 1A Buck PWM RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2575TV-5 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator |
| LM2575TV-5G | 功能描述:直流/直流开关调节器 5V 1A PWR SW REG RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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