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PDF AX3015B Data sheet ( Hoja de datos )
| Número de pieza | AX3015B | |
| Descripción | 2A PWM Buck DC/DC Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX3015B (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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AX3015/A/B/C
2A PWM Buck DC/DC Converter
GENERAL DESCRIPTION
The AX3015/A/B/C series are monolithic IC designed for a step-down DC/DC
converter, and own the ability of driving a 2A 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. Current limit
depends on RSENSE value. The over voltage protection (OVP) that can avoid high VOUT
voltage to damage circuit and capacitor, the OVP voltage is set by outside resistances.
When SCP happened and VEN/CT>0.5V, the driver can be auto restart that can prevent
driver damage. The auto-restart time set by outside capacitor. The chip is available in
SOP-8L-EP package which features small size as exposed pad to reduce the
junction-to-case resistance.
FEATURES
- Operating voltage can be up to 40V.
- Adjustable version output voltage range form 1.2V to 30V.
- Output load current: 2A.
- External OVP setting function.
- Operating Frequency:
AX3015/A: 130KHz
AX3015B/C: 50KHz
- Voltage mode non-synchronous PWM converter
- Thermal-shutdown and current-limit protection.
- Shutdown function and auto restart control.
- Short Circuit Protect (SCP).
- External current limit setting.
- Under voltage Lockout.
- SOP-EP Pb-Free package.
- Built-in switching transistor on chip.
1/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Aug.04, 2010
1 page  
AX3015/A/B/C
OVP
The Over Voltage sense pin, If VOVP >1.25V, the OVP is happened that it can turn-off
the driver. You can set VOUT OVP voltage by outside resistances (R3 and R4), Please see
below formula to set.
EN/CT
VOUT(OVP)
1.25 (1
R3 )
R4
The pin is enable/shutdown and auto restart control functions. When system is
normal operating, this pin is enable/shutdown function. Pulling this pin below a threshold
voltage of under 0.3V shuts the regulator off, and pulling this pin from 0.5V to 1.5V turns
the regulator on. However when VOUT is short (VFB<0.4V), the auto restart function can be
started that restart the regulator cycle by cycle. The cycle time is set by outside capacitor
(C6). Please refer the below waveform and formula, the t2 cycle is regulator off time and t1
cycle is current limit time. The charge-current is 30uA and discharge-current is 1.3uA.
Iin (A)
Current Limit
VEN/CT
1.5V
0.5V
0
t1
t2
t1 C 6 1 (Sec.)
30u
t2 C 6 1 (Sec.)
1.3u
Time
Time
5/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Aug.04, 2010
5 Page 
AX3015/A/B/C
TYPICAL CHARACTERISTICS (COUNTINOUS)
Power-ON
Power-ON
EN-ON
EN-ON
Load Transient (AX3015)
Load Transient (AX3015)
11/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Aug.04, 2010
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AX3015B.PDF ] | |
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