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PDF AX3011 Data sheet ( Hoja de datos )
| Número de pieza | AX3011 | |
| Descripción | 2A PWM Buck DC/DC Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3011 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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AX3011
50KHz, 2A PWM Buck DC/DC Converter
GENERAL DESCRIPTION
The AX3011 series are monolithic IC designed for a step-down DC/DC converter, and
own the ability of driving a 2.5A 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; current limit is against over current
operating of the output switch that set by outside resistance. If current limit function occurs
and VFB is down below 0.3V, the switching frequency will be reduced to 10 KHz; and over
voltage protection (OVP) that can avoid high VOUT voltage to damage circuit and capacitor.
The chip is available in SOP-8L-EP package which features small size as SOP-8L with an
Exposed Pad to reduce the junction-to-case resistance.
FEATURES
- Operating voltage can be up to 40V.
- Maximum adjustable output voltage up to 38V.
- Typical switching frequency is 50K Hz.
- Voltage mode non-synchronous PWM converter.
- Thermal-shutdown and current-limit protection.
- Short Circuit Protect (SCP).
- External current limit setting.
- Over Voltage Protect (OVP) Sense and Output.
- Output load current: 2A.
- Low power standby mode.
- Built-in switching transistor on chip.
- SOP-8L-EP Pb-Free packages.
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Aug.04, 2010
1 page  
AX3011
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.
FB
Sense the regulated output voltage to complete the feedback loop.
OCSET
The current limit threshold is setting by the external resistor (R3) connecting from VCC
supply to OCSET pin. Normally, the current limit setting more than IOUT 0.8A, Please refer
the table for setting the minimum current limit value:
R3 (Ω) Current Limit (A)
1.5K 1.22
1.8K 1.44
2.2K 1.78
2.7K 2.14
3K 2.34
3.3K 2.56
3.9K 2.98
OVP
The OVP pin must pull high a 10K resistance, If VSENSE >1.23V, The OVP is
happened that OVP can be pull high, system can be control the output PMOS OFF and
internal driver off.
SENSE
The Over Voltage sense pin, If VSENSE >1.23V, the OVP is happened that it can
turn-off the driver. You can set VOUT OVP voltage by outside resistances (R6 and R7).
COMP
The compensation pin. The COMP pin connects R5 and C5 to FB pin, The C5 use 47nF
and R5 use 4.7KΩ for all condition.
5/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.4 Aug.04, 2010
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AX3011.PDF ] | |
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