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PDF AX3117 Data sheet ( Hoja de datos )
| Número de pieza | AX3117 | |
| Descripción | PWM Control 3A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX3117
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3117/A/B consists of step-down switching regulator with PWM control. The device
includes a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3117/A/B provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly forms 0 up to 100%.
An over current protection and short circuit protection functions are built outside that it can
set by a resistance. An external compensation is easily to system stable; the low ESR
output capacitor can be used.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode
connected externally, these ICs can function as step-down switching regulators. They
serve as ideal power supply units for portable devices when coupled with the SOP-8L-EP
package, providing such outstanding features as low current consumption. Since this
converter can accommodate an input voltage up to 40V, it is also suitable for the operation
via an AC adapter.
FEATURES
- Input Voltage：8V to 40V
- Duty ratio：0% to 100% PWM control
- Oscillation frequency：100K/300KHz
- Thermal Shutdown function.
- Short Circuit Protect (SCP).
- Built-in internal SW P-channel MOS.
- Current mode non-synchronous PWM converter
- External current limit setting.
- Under Voltage Lockout.
- Over Voltage Protection.
- Line-compensation built in.
- SOP-8L-EP Pb-Free package.
1/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jun.09, 2012
1 page  
AX3117
Iin (A)
Current Limit
VEN/CT
1.5V
Time
0.5V
0
t1
t2
Under Voltage Lockout (UVLO)
Time
t1
=
C10
×
1
26u
(Sec.)
t2
=
C10
×
1
1.8u
(Sec.)
To avoid error-operation of the device at low input voltages an under voltage lockout
is included that disables the device, if the input voltage lower than 5.8V.
Current Limit Protection
The Current limit is set by outside resistance (RSENSE), When the SENSE1-SENSE2
voltage larger than 140mV, the current limit is happened that driver can be turned off until
the drop is small than 90mV. The current limit set according to the following equation:
CurrentLim
it
(A)
=
140m
V
+ (140mV
2 × R SENSE
-
50m
V)
The maximum output current table is shown as below; please refer the table to design.
RSENSE (Ω)
50m
Current Limit (A)
2.3
75m 1.53
100m
1.15
Inductor Selection
For most designs, the different frequency can be reducing the inductor value; Please
refer the table below.
L1 recommend value (VIN=10~36V ,VOUT=5V)
Version
AX3117A
AX3117/B
L1 Value (H)
22~47u
66~100u
5/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jun.09, 2012
5 Page 
AX3117
TYPICAL CHARACTERISTICS (CONTINUOUS)
AX3117/A
Line Compensation (RSENSE=50mΩ), IOUT=2A Line Compensation (RSENSE=50mΩ), IOUT=1A
AX3117B
Line Compensation (RSENSE=50mΩ), IOUT=2A Line Compensation (RSENSE=50mΩ), IOUT=1A
11/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.3 Jun.09, 2012
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AX3117.PDF ] | |
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