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AX2020 데이터시트 PDF




AXElite에서 제조한 전자 부품 AX2020은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 AX2020 자료 제공

부품번호 AX2020 기능
기능 1A Step-down High Brightness LED Driver
제조업체 AXElite
로고 AXElite 로고


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AX2020 데이터시트, 핀배열, 회로
AX2020
32V,1A Step-down High Brightness
LED Driver with 5000:1 Dimming
GENERAL DESCRIPTION
The AX2020 is a continuous conduction mode inductive step-down converter, designed
for driving single or multiple series connected LED efficiently from a voltage source higher
than the total LED chain voltage. The device operates from an input supply between 8V and
32V and provides an externally adjustable output current of up to 1A. Depending upon the
supply voltage and external components, the AX2020 can provide more than 15 watts of
output power. The AX2020 includes the power switch and a high-side output current sensing
circuit, which uses an external resistor to set the nominal average output current, and a
dedicated DIM input accepts a wide range of pulsed dimming. Applying a voltage of 0.3V or
lower to the DIM pin turns the output off and switches the device into a low current standby
state.
The AX2020 is available in SOT89-5L package.
FEATURES
- Simple low parts count
- Wide input voltage range: 8V to 32V
- Up to 1A output current
- Single pin on/off and brightness control using PWM
- Up to 1MHz switching frequency
- Typical 5% output current accuracy
- High-Side Current Sense
- Hysteretic Control: No Compensation
- Adjustable Constant LED Current
Axelite Confidential Materials, do not copy or distribute without written consent.
1/11




AX2020 pdf, 반도체, 판매, 대치품
AX2020
Duty cycle
dimming
range
of
high
frequency
DPWM_HF
fDIM = 20kHz
Brightness control range
DIM pull up resistor to Internal
supply voltage
RDIM
DIM input leakage low
IDIM_L VDIM = 0
Output Switch
Saturation Voltage
VSAT IOUT = 0.3A
Saturation Voltage
VSAT IOUT = 0.8A
Continuous SW Current
ISWmean
SW Leakage Current
ILEAK
Thermal Shutdown
Thermal Shutdown Threshold
TSD
Thermal Shutdown hysteresis
TSD-hys
APPLICATION CIRCUIT
RS
VIN
0.4
4% - 1
- 25:1 -
- 300 - KΩ
- 70 - μA
- 0.8 1.0 V
- 1.0 1.2 V
- - 1.0 A
- 0.5 5 μA
- 150 - °C
- 35 - °C
L1
1W LED
47uH
CIN 4.7uF~100uF
D
VIN
DIM
CSN
AX2020
GND
SW
ILED
=
VCSN
RS
=
0.130
0.4
= 0.325 A
4/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.06, 2010

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AX2020 전자부품, 판매, 대치품
AX2020
Capacitor selection
A low ESR capacitor should be used for input decoupling, as the ESR of this capacitor
appears in series with the supply source impedance and lowers overall efficiency. This
capacitor has to supply the relatively high peak current to the coil and smooth the current
ripple on the input supply. A minimum value of 4.7uF is acceptable if the input source is
close to the device, but higher values will improve performance at lower input voltages,
especially when the source impedance is high. The input capacitor should be placed as
close as possible to the IC.
For maximum stability over temperature and voltage, capacitors with X7R, X5R, or
better dielectric are recommended. Capacitors with Y5V dielectric are not suitable for
decoupling in this application and should not be used.
Inductor selection
Recommended inductor values for the AX2020 are in the range 47uH to 120uH.
Higher values of inductance are recommended at lower output current in order to minimize
errors due to switching delays, which result in increased ripple and lower efficiency. Higher
values of inductance also result in a smaller change in output current over the supply voltage
range. The inductor should be mounted as close to the device as possible with low
resistance connections to the SW and VIN pins.
Diode selection
For maximum efficiency and performance, the rectifier (D1) should be a fast low
capacitance Schottky diode with low reverse leakage at the maximum operating voltage and
temperature.
They also provide better efficiency than silicon diodes, due to a combination of lower
forward voltage and reduced recovery time.
It is important to select parts with a peak current rating above the peak coil current and
a continuous current rating higher than the maximum output load current. It is very important
to consider the reverse leakage of the diode when operating above 85°C. Excess leakage
will increase the power dissipation in the device and if close to the load may create a thermal
runaway condition.
The higher forward voltage and overshoot due to reverse recovery time in silicon
diodes will increase the peak voltage on the SW output. If a silicon diode is used, care
should be taken to ensure that the total voltage appearing on the SW pin including supply
ripple, does not exceed the specified maximum value.
7/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.06, 2010

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