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AX3133 데이터시트 PDF




AXElite에서 제조한 전자 부품 AX3133은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 AX3133 기능
기능 PWM Control 3A Step-Down Converter
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AX3133 데이터시트, 핀배열, 회로
AX3133
PWM Control 3A Step-Down Converter
GENERAL DESCRIPTION
AX3133 consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX3133 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 package, providing such outstanding features as low current consumption.
Since this converter can accommodate an input voltage up to 32V, it is also suitable for the
operation via an AC adapter.
FEATURES
- Input voltage8V to 33V
- Output voltage3.3V to 26V
- Duty ratio0% 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 Pb-Free package.
1/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Oct.15, 2010




AX3133 pdf, 반도체, 판매, 대치품
AX3133
ELECTRICAL CHARACTERISTICS
(VCC = 12V, TA=25°C, unless otherwise specified)
Characteristics
Symbol Conditions
Feedback Voltage
Quiescent Current
VCC = 10V~32V
VFB IOUT = 0 to 2A
Tj=-20°C ~125°C
ICCQ
VFB=1.2V
force driver off
Feedback Bias Current
IFB IOUT=0.1A
Shutdown Supply Current
ISD VEN/SS =0V
Current Limit
ICL
Adjustable frequency range
FOSC
Short frequency
EN/SS Pin Shutdown Logic
input threshold voltage
FOSC1 VCC = 10V~32V
VENL
EN/SS Pull high Current
IEN/SS VEN/SS=0V
Internal MOSFET RDSON
RDSON VCC=12V, VFB=0V
VCC = 12V,
VOUT = 5V,
Efficiency
EFFI
IOUT = 2A
VCC = 28V,
VOUT = 5V,
IOUT = 2A
Min Typ Max Units
0.800 0.815 0.830 V
- 3 6 mA
- 0.1 0.5 uA
- 3 6 mA
3.3 - - A
50 - 380 KHz
45 50 55 KHz
- - 0.8 V
- 5 - uA
- 60 110
91
- -%
87
4/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Oct.15, 2010

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AX3133 전자부품, 판매, 대치품
AX3133
Where is inductor Ripple Current. Large value inductors lower ripple current and small
value inductors result in high ripple currents. Choose inductor ripple current approximately
20% of the maximum load current 3A, ΔIL=0.6A. The DC current rating of the inductor
should be at least equal to the maximum load current plus half the ripple current to prevent
core saturation (3A+0.3A).
Input Capacitor Selection
This capacitor should be located close to the IC using short leads and the voltage
rating should be approximately 1.5 times the maximum input voltage. The RMS current
rating requirement for the input capacitor of a buck regulator is approximately 1⁄2 the DC
load current. A low ESR input capacitor sized for maximum RMS current must be used. A
470µF low ESR capacitor for most applications is sufficient.
Output Capacitor Selection
The output capacitor is required to filter the output and provide regulator loop stability.
The important capacitor parameters are; the 100 KHz Equivalent Series Resistance (ESR),
the RMS ripples current rating, voltage rating, and capacitance value. For the output
capacitor, the ESR value is the most important parameter. The ESR can be calculated from
the following formula.
V I   ESR = 0.6A x 80mΩ= 48mV
RIPPLE
L
An aluminum electrolytic capacitor's ESR value is related to the capacitance and its
voltage rating. In most case, higher voltage electrolytic capacitors have lower ESR values.
Most of the time, capacitors with much higher voltage ratings may be needed to provide the
low ESR values required for low output ripple voltage. It is recommended to replace this
low ESR capacitor by using a 470µF low ESR values < 80mΩ.
7/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Oct.15, 2010

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