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| 型号： | NCV2575D2T-5G |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1A D2PAK-5 |
| 产品变化通告： | Product Discontinuation 27/Jan/2012 |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 4.75 V ~ 40 V |
| PWM 型： | 电流/电压模式 |
| 频率 - 开关： | 52kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 包装： | 管件 |
| 供应商设备封装： | D2PAK |
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LM2575, NCV2575
d + on + O ,
in
100 m H
I Q
V in
V O
I Load
t V
T V
(quiescent current) and V sat can be found in the
LM2575 data sheet,
is minimum input voltage applied,
is the regulator output voltage,
is the load current.
Unregulated
DC Input
12 V to 25 V
C in
100 m F
/50 V
+V in
1
3
LM2575 ? 12
GND 5
Feedback
4 L1
Output
2
ON/OFF D1
1N5819
C out
1800 m F
/16 V
Regulated
The dynamic switching losses during turn ? on and
turn ? off can be neglected if proper type catch diode is used.
Packages Not on a Heatsink (Free ? Standing)
For a free ? standing application when no heatsink is used,
the junction temperature can be determined by the following
expression:
T J = (R q JA ) (P D ) + T A
where (R q JA )(P D ) represents the junction temperature rise
caused by the dissipated power and T A is the maximum
ambient temperature.
Packages on a Heatsink
If the actual operating junction temperature is greater than
the selected safe operating junction temperature determined
in step 3, than a heatsink is required. The junction
temperature will be calculated as follows:
T J = P D (R q JA + R q CS + R q SA ) + T A
where R q JC is the thermal resistance junction ? case,
R q CS is the thermal resistance case ? heatsink,
R q SA is the thermal resistance heatsink ? ambient.
If the actual operating temperature is greater than the
selected safe operating junction temperature, then a larger
heatsink is required.
Some Aspects That can Influence Thermal Design
It should be noted that the package thermal resistance and
the junction temperature rise numbers are all approximate,
and there are many factors that will affect these numbers,
such as PC board size, shape, thickness, physical position,
location, board temperature, as well as whether the
surrounding air is moving or still.
Other factors are trace width, total printed circuit copper
area, copper thickness, single ? or double ? sided, multilayer
board, the amount of solder on the board or even color of the
traces.
The size, quantity and spacing of other components on
the board can also influence its effectiveness to dissipate
the heat.
Output
-12 V @ 0.35 A
Figure 25. Inverting Buck ? Boost Regulator Using the
LM2575 ? 12 Develops ? 12 V @ 0.35 A
ADDITIONAL APPLICATIONS
Inverting Regulator
An inverting buck ? boost regulator using the LM2575 ? 12
is shown in Figure 25. This circuit converts a positive input
voltage to a negative output voltage with a common ground
by bootstrapping the regulators ground to the negative
output voltage. By grounding the feedback pin, the regulator
senses the inverted output voltage and regulates it.
In this example the LM2575 ? 12 is used to generate a
? 12 V output. The maximum input voltage in this case
cannot exceed +28 V because the maximum voltage
appearing across the regulator is the absolute sum of the
input and output voltages and this must be limited to a
maximum of 40 V.
This circuit configuration is able to deliver approximately
0.35 A to the output when the input voltage is 12 V or higher.
At lighter loads the minimum input voltage required drops
to approximately 4.7 V, because the buck ? boost regulator
topology can produce an output voltage that, in its absolute
value, is either greater or less than the input voltage.
Since the switch currents in this buck ? boost configuration
are higher than in the standard buck converter topology, the
available output current is lower.
This type of buck ? boost inverting regulator can also
require a larger amount of startup input current, even for
light loads. This may overload an input power source with
a current limit less than 1.5 A.
Such an amount of input startup current is needed for at
least 2.0 ms or more. The actual time depends on the output
voltage and size of the output capacitor.
Because of the relatively high startup currents required by
this inverting regulator topology, the use of a delayed startup
or an undervoltage lockout circuit is recommended.
http://onsemi.com
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV2575D2T-5R4G | 功能描述:直流/直流开关调节器 ANA 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 |
| NCV2575D2T-ADJ | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:ON Semiconductor 功能描述: |
| NCV2575D2T-ADJG | 功能描述:直流/直流开关调节器 ANA ADJ 1A PW 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 |
| NCV2575D2TADJR4G | 功能描述:直流/直流开关调节器 ANA ADJ 1A PW 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 |
| NCV2575D2T-ADJR4G | 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 |
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