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Número de pieza | AX3022 | |
Descripción | 1.5A PWM Buck DC/DC Converter | |
Fabricantes | AXElite | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de AX3022 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
No Preview Available ! AX3022
200KHz, 1.5A PWM Buck DC/DC Converter
GENERAL DESCRIPTION
The AX3022 series are monolithic IC designed for a step-down DC/DC converter, and
own the ability of driving a 1.5A load without additional transistor. It saves board space. The
external shutdown function can be controlled by logic level and then come into standby
mode. The internal compensation makes feedback control having good line and load
regulation without external design. Regarding protected function, thermal shutdown is to
prevent over temperature operating from damage, and current limit is against over current
operating of the output switch. If current limit function occurs and VFB is down below 0.5V,
the switching frequency will be reduced. The AX3022 series operates at a switching
frequency of 200KHz thus allow smaller sized filter components than what would be
needed with lower frequency switching regulators. Other features include a guaranteed
+3% tolerance on output voltage under specified input voltage and output load conditions,
The chips are available in a standard SOT89-5L package.
FEATURES
- Output voltage: adjustable output version.
- Adjustable version output voltage range: 0.75V to 22V+3%.
- 200KHz fixed switching frequency.
- Voltage mode non-synchronous PWM control.
- Thermal-shutdown and current-limit protection.
- ON/OFF shutdown control input.
- Short Circuit Protect (SCP).
- Operating voltage can be up to 24V.
- Output load current: 1.5A.
- SOT89-5L Pb-Free packages.
- Low power standby mode.
- Built-in switching transistor on chip.
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Oct.11, 2011
1 page AX3022
VSS
Circuit ground.
SW
Internal switch. The voltage at this pin switches between (+VCC – VSAT) and
approximately – 0.5V, with a duty cycle of approximately VOUT / VCC. To minimize coupling
to sensitive circuitry, the PC board copper area connected to this pin should be minimized.
Feedback
Senses the regulated output voltage to complete the feedback loop.
EN
Allows the switching regulator circuit to be shutdown using logic level signals thus
dropping the total input supply current to approximately 10uA. Pulling this pin below a
threshold voltage of approximately 0.5V shuts the regulator down, and pulling this pin
above 2.0V (up to a maximum of VCC) turns the regulator on.
Thermal Considerations
The SOT89-5L 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 AX3022 junction temperature rises above ambient temperature
for a 1.5A load and different input and output voltages.
For the best thermal performance, wide copper traces and generous amounts of PCB
copper (need connect to the VSS pins) should be used in the board layout, (One exception
is the SW 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.
5/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Oct.11, 2011
5 Page |
Páginas | Total 10 Páginas | |
PDF Descargar | [ Datasheet AX3022.PDF ] |
Número de pieza | Descripción | Fabricantes |
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