参数资料
| 型号： | AP1501-T5L-U |
| 厂商： | Diodes Inc |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A TO2200-5 |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 37 V |
| 输入电压： | 4.5 V ~ 40 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 150kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 |
| 包装： | 管件 |
| 供应商设备封装： | TO-220-5 |
AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Functional Description
Pin Functions
+V IN
This is the positive input supply for the IC switching regulator. A
suitable input bypass capacitor must be present at this pin to
minimize voltage transients and to supply the switching currents
needed by the regulator.
Ground
PC board to simulate the junction temperature under actual
operating conditions. This curve can be used for a quick check
for the approximate junction temperature for various conditions,
but be aware that there are many factors that can affect the
junction temperature. When load currents higher than 2A are
used, double sided or multilayer PC boards with large copper
areas and/or airflow might be needed, especially for high ambient
temperatures and high output voltages.
Circuit ground.
For the best thermal performance, wide copper traces and
temperature of 25 C (still air). These temperature rise numbers
soldered to should be at least 0.4 in , and ideally should have
approximately 6 in , only small improvements in heat dissipation
Output
Internal switch. The voltage at this pin switches between (+V IN –
V SAT ) and approximately – 0.5V, with a duty cycle of
approximately V OUT / V IN . To minimize coupling to sensitive
circuitry, the PC board copper area connected to this pin should
be kept a minimum.
Feedback
Senses the regulated output voltage to complete the feedback
loop.
ON/OFF
Allows the switching regulator circuit to be shutdown using logic
level signals thus dropping the total input supply current to
approximately 150uA. Pulling this pin below a threshold voltage
of approximately 1.3V turns the regulator on, and pulling this pin
above 1.3V (up to a maximum of 40V) shuts the regulator down.
If this shutdown feature is not needed, the ON/OFF pin can be
wired to the ground pin or it can be left open, in either case the
regulator will be in the ON condition.
Thermal Considerations
The AP1501 is available in 5-pin surface mount TO-263 and
TO-220.
The TO-220 package needs a heat sink under most conditions.
The size of the heat sink depends on the input voltage, the output
voltage, the load current and the ambient temperature. The
AP1501 junction temperature rises above ambient temperature
for a 3A load and different input and output voltages. The data
for these curves was taken with the AP1501 (TO-220 package)
operating as a buck switching regulator in an ambient
o
are all approximate and there are many factors that can affect
these temperatures. Higher ambient temperatures require more
heat sinking.
The TO-263 surface mount package tab is designed to be
soldered to the copper on a printed circuit board. The copper
and the board are the heat sink for this package and the other
heat producing components, such as the catch diode and
inductor. The PC board copper area that the package is
2
2 or more square inches of 2 oz. Additional copper area improves
the thermal characteristics, but with copper areas greater than
2
are realized. If further thermal improvements are needed, double
sided, multilayer PC boards with large copper areas and/or
airflow are recommended.
The AP1501 (TO-263 package) junction temperature rises above
ambient temperature with a 2A load for various input and output
voltages. This data was taken with the circuit operating as a
buck switching regulator with all components mounted on a
generous amounts of printed circuit board copper should be used
in the board layout. (One exception to this is the output (switch)
pin, which should not have large areas of copper.) Large areas
of copper provide the best transfer of heat (lower thermal
resistance) to the surrounding air, and moving air lowers the
thermal resistance even further.
Package thermal resistance and junction temperature rise
numbers are all approximate, and there are many factors that will
affect these numbers. Some of these factors include board size,
shape, thickness, position, location, and even board temperature.
Other factors are, trace width, total printed circuit copper area,
copper thickness, single or double-sided, multilayer board and
the amount of solder on the board. The effectiveness of the
PC board to dissipate heat also depends on the size, quantity
and spacing of other components on the board, as well as
whether the surrounding air is still or moving.
Furthermore, some of these components such as the catch diode
will add heat to the PC board and the heat can vary as the input
voltage changes. For the inductor, depending on the physical
size, type of core material and the DC resistance, it could either
act as a heat sink taking heat away from the board, or it could
add heat to the board.
AP1501 Rev. 11
9 of 12
www.diodes.com
JANUARY 2009
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AP1501T5R | 制造商:ANACHIP 制造商全称:Anachip Corp 功能描述:150 KHZ 3A PWM BUCK DC/DC CONVERTER |
| AP1501-T5R | 制造商:ANACHIP 制造商全称:Anachip Corp 功能描述:150 KHZ 3A PWM BUCK DC/DC CONVERTER |
| AP1501T5RA | 制造商:ANACHIP 制造商全称:Anachip Corp 功能描述:150 KHZ 3A PWM BUCK DC/DC CONVERTER |
| AP1501-T5RA | 制造商:ANACHIP 制造商全称:Anachip Corp 功能描述:150 KHZ 3A PWM BUCK DC/DC CONVERTER |
| AP1501T5RG-13 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:150KHz, 3A PWM BUCK DC/DC CONVERTER |
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