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AX2001のメーカーはAXEliteです、この部品の機能は「0.25V Feedback Voltage Step-Down Switching Regulators」です。 |
部品番号 | AX2001 |
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部品説明 | 0.25V Feedback Voltage Step-Down Switching Regulators | ||
メーカ | AXElite | ||
ロゴ | |||
このページの下部にプレビューとAX2001ダウンロード(pdfファイル)リンクがあります。 Total 8 pages
AX2001/A
1A, 0.25V Feedback Voltage Step-Down
Switching Regulators for LED Driver
GENERAL DESCRIPTION
AX2001/A consists of step-down switching regulator with PWM control. These devise
include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and
etc.
AX2001/A provides low-ripple power, high efficiency, and excellent transient
characteristics. The PWM control circuit is able to the duty ratio linearly from 0 up to 100%.
An enable function, 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. Also,
an internal compensation block is built in to minimum external component count.
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 package,
providing such outstanding features as low current consumption. Since this converter can
accommodate an input voltage up to 23V, it is also suitable for the operation via an AC
adapter.
FEATURES
- Input voltage:4.5V to 23V
- Output voltage:0.25V to VCC
- LED Backlight and High Power LED Application
- Duty ratio:0% to 100% PWM control
- Oscillation frequency:
AX2001: 330KHz typ.
AX2001A: 500KHz typ.
- Enable/Disable function.
- Current Limit (CL), Thermal Shutdown and Short Circuit Protections (SCP).
- Built-in internal SW P-channel MOS.
- No output capacitor is stable.
- SOP-8L Pb-Free package.
1/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.21, 2011
1 Page AX2001/A
ABSOLUTE MAXIMUM RATINGS (at TA=25°C)
Characteristics
Symbol
VCC Pin Voltage
VCC
Feedback Pin Voltage
VFB
ON/OFF Pin Voltage
VEN
Switch Pin Voltage
VSW
Power Dissipation
PD
Storage Temperature Range
TST
Operating Temperature Range
Operating Supply Voltage
Thermal Resistance from Junction to case
TOP
VOP
θJC
Thermal Resistance from Junction to ambient
θJA
Rating
VSS - 0.3 to VSS + 25
VSS - 0.3 to VCC
VSS - 0.3 to VCC + 0.3
VSS - 0.3 to VCC + 0.3
Internally limited
-40 to +150
-40 to +125
+4.5 to +23
25
70
Unit
V
V
V
V
mW
°C
°C
V
°C/W
°C/W
Note : θJA is measured with the PCB copper area(need connect to SW pins) of approximately 1 in2(Multi-layer).
ELECTRICAL CHARACTERISTICS
(VIN = 12V, TA=25°C, unless otherwise specified)
Characteristics
Symbol
Conditions
Min Typ Max Units
Feedback Voltage
Quiescent Current
Feedback Bias Current
Shutdown Supply Current
VFB IOUT=0.2A
0.24 0.25 0.26 V
ICCQ
VFB=1.2V force driver
off
3 5 mA
IFB IOUT=0.1A
- 0.1 0.5 uA
ISD VEN =0V
- 2 10 uA
Switch Current
Line Regulation
Load Regulation
ISW
△VOUT/VOUT
VCC=5V~23V,
IOUT=0.2A
△VOUT/VOUT IOUT = 0.1 to 1A
1.3 - -
- 12
- 0.2 0.5
A
%
%
Oscillation Frequency
FOSC
AX2001
AX2001A
260 330 400 KHz
400 500 600 KHz
EN Pin Logic input threshold
voltage
VSH
VSL
High (regulator ON)
Low (regulator OFF)
2.0
-
-
-
-
0.8
V
EN Pin Input Current
Internal MOSFET RDSON
ISH
ISL
RDSON
VEN=2.5V (ON)
VEN=0.3V (OFF)
VCC=5V, VFB=0V
VCC=12V, VFB=0V
- 20 - uA
- -10 - uA
-
-
160 220
120 180
mΩ
Efficiency
EFFI
VOUT = 5V
IOUT = 0.5A
IOUT = 1A
-
-
91
91
-
-
%
Thermal shutdown Temp
TSD
- 140 - °C
3/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.21, 2011
3Pages AX2001/A
Table 1 Resistor select for LED output current setting
ILED R2
350mA
0.715Ω
87.5mW
750mA
0.333Ω
189mW
RDS (ON) Current Limiting
The current limit threshold is setting by the internal circuit.
Compensation
Please refer the table of application circuit. For DC input, the option circuit for
compensation is connecting R4 and a 4148 diode to VOUT. In order to protect short circuit
and thermal shutdown release for LED.
PCB layout guide
If you need low Tc and Tj or large PD (Power Dissipation), the dual SW pins (5 and 6)
on the SOP-8L package are internally connected to die pad, The PCB layout should allow for
maximum possible copper area at the SW pins of the AX2001/A.
6/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.2 Oct.21, 2011
6 Page | |||
ページ | 合計 : 8 ページ | ||
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PDF ダウンロード | [ AX2001 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
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