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PDF AX3111A Data sheet ( Hoja de datos )
| Número de pieza | AX3111A | |
| Descripción | PWM Control 2A Step-Down Converter | |
| Fabricantes | AXElite | |
| Logotipo |  |
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AX3111A
PWM Control 2A Step-Down Converter
GENERAL DESCRIPTION
AX3111A consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3111A 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 PDIP-8L 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：VFB 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.
1/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.8 Nov.14, 2011
1 page  
AX3111A
COUT ESR Range
30m~80mΩ
80m~300mΩ
Compensation Table
Frequency (Hz) VIN Range L1 C9 C2
50K
150K
250K
350K
50K
150K
250K
350K
8~40V
100u 10n 2700P
68u 10n 2700P
33u 10n 1500P
22u 10n 1800P
100u 47n 820P
68u 47n 1200P
33u 47n 1500P
22u 47n 1800P
FUNCTION DESCRIPTIONS
EN/SS
This pin can be supplied shutdown or soft start function. It is inside pull high function.
For normal application, the pin must be connected a capacitor to ground. There is a 5uA
current to charge this capacitor, vary the different capacitor value to control soft start time.
Allow the switching regulator circuit to be shutdown pulling this pin below a 0.8V threshold
voltage.
OSC
External frequency set pin. The pin connects a resistance (R3) to reduce system
frequency. This converter’s frequency can be set from 50K to 350KHz, please refer the
below table to set frequency.
R3 (Ω)
Frequency (Hz)
T=Room Temperature
10M 240K
52K 150K
110K
250K
68K
350K
COMP
Compensation pin. For EL output capacitor application, the COMP pin connects R2 and
C9 to ground for all condition; please refer the compensation table.
5/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.8 Nov.14, 2011
5 Page 
PACKAGE OUTLINES
(1) SOP-8L-EP
X
AX3111A
Expose Pad
b
D
7 (4X)
L
DETAIL A
θ
e
y
Symbol
Dimensions in Millimeters
Min. Nom. Max.
A - - 1.75
A1 0
- 0.15
A2 1.25
-
-
C 0.1 0.2 0.25
D 4.7 4.9 5.1
E 3.7 3.9 4.1
H 5.8 6 6.2
L 0.4 - 1.27
b 0.31 0.41 0.51
e 1.27 BSC
y - - 0.1
X - 2.34 -
Y - 2.34 -
θ 0O - 8O
Mold flash shall not exceed 0.25mm per side
JEDEC outline: MS-012 BA
DETAIL A
Dimensions in Inches
Min. Nom. Max.
- - 0.069
0 - 0.06
0.049
-
-
0.0075
0.008
0.01
0.185
0.193
0.2
0.146
0.154
0.161
0.228
0.236
0.244
0.015
-
0.05
0.012
0.016
0.02
0.050 BSC
- - 0.004
- 0.092 -
- 0.092 -
0O - 8O
11/12
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.8 Nov.14, 2011
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AX3111A.PDF ] | |
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