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PDF AX3111 Data sheet ( Hoja de datos )
| Número de pieza | AX3111 | |
| Descripción | PWM Control 3A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX3111
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3111 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3111 provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%.
This converter is build out soft start function that prevents overshoot and inrush current at
startup. An over current protect function and short circuit protect function are built inside,
and when OCP or SCP happens, the operation frequency will be reduced. The operating
frequency is decided by outside 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 with
exposed pad and TDFN-10L packages, 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
- Output voltage：3.3V to 38V
- Duty ratio：0% to 100% PWM control
- Oscillation frequency range is 50K~350KHz by outside resistance setting
- Enable with Soft-Start function
- Current Limit, Short Circuit Protect (SCP) and Thermal Shutdown protection
- Built-in internal SW P-channel MOS.
- SOP-8L-EP and PDIP-8L Pb-Free packages.
1/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.1 Nov.14, 2011
Free Datasheet http://www.0PDF.com
1 page  
AX3111
APPLICATION CIRCUIT
(1) EL cap
VIN+8~40V
C1
1uF
C5
470uF
C6
0.1uF
R5 C10 C7
18K 0.1uF 0.1uF
(Option)
AX3111ES
VCC
SW
L1
1
2
VOUT = 5V/3A
VGATE
FB
D1
B340
R1
5.6K
C2
EN/SS COMP
C3 C4
0.1uF
470uF
GND
OSC
R2
R4
1.1K
R3
C9
R1
VOUT = VFB x (1 +
)
R4
VFB = 0.815V ; R4 suggest 0.8K ~ 3k
COUT ESR Range
30m~80mΩ
80m~300mΩ
EL Capacitor Compensation Table
Frequency (Hz) VIN Range R2 C9 C2
L1
50K
150K
250K
350K
50K
150K
250K
350K
8~40V
470 4n7 2700p 100u
470 4n7 1200p 68u
470 4n7 1000p 33u
470 4n7 1200p 22u
470 4n7 2700p 100u
470 4n7 1500p 68u
470 4n7 560p 33u
470 4n7 270p 22u
5/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.1 Nov.14, 2011
Free Datasheet http://www.0PDF.com
5 Page 
AX3111
TYPICAL CHARACTERISTICS (CONTINUOUS)
Power-ON Wave (F=60KHz)
Power-ON Wave (F=60KHz)
(VIN=12V, VOUT=5V, Load=2A, CEN/SS=0.1uF) (VIN=24V, VOUT=5V, Load=2A, CEN/SS=0.1uF)
Enable-ON Wave (60KHz)
Enable-ON Wave (60KHz)
(VIN=12V, VOUT=5V, Load=2A, CEN/SS=0.1uF) (VIN=24V, VOUT=5V, Load=2A, CEN/SS=0.1uF)
Load Transient (F=60KHz)
(VIN=12V, VOUT=5V, Load=0.3~2.7A)
Load Transient (F=60KHz)
(VIN=24V, VOUT=5V, Load=0.3~2.7A)
11/13
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.2.1 Nov.14, 2011
Free Datasheet http://www.0PDF.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AX3111.PDF ] | |
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