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AX3161 데이터시트 PDF




AXElite에서 제조한 전자 부품 AX3161은 전자 산업 및 응용 분야에서
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부품번호 AX3161 기능
기능 2A PWM Buck DC/DC Converter
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AX3161 데이터시트, 핀배열, 회로
AX3161
52KHz, 2A PWM Buck DC/DC Converter
GENERAL DESCRIPTION
The AX3161 series are monolithic IC designed for a step-down DC/DC converter, and
own the ability of driving a 2A load without additional transistor. It saves board space. The
external shutdown function can be controlled by logic level and then come into standby
mode. The internal compensation makes feedback control having good line and load
regulation without external design. Regarding protected function, thermal shutdown is to
prevent over temperature operating from damage, and current limit is against over current
operating of the output switch. If current limit function occurs and VFB is down below 0.5V,
the switching frequency will be reduced. An external compensation is easily to system
stable; the low ESR output capacitor can be used.
The AX3161 series operates at a switching frequency of 52KHz thus allow smaller
sized filter components than what would be needed with lower frequency switching
regulators. The output version included fixed 5V, 12V, and an adjustable type. The chips
are available in standard TO263-5L, TO220-5L and TO220-5LR packages.
FEATURES
- Output voltage: 5V and adjustable output version.
- Adjustable version output voltage range, 1.23V to 57V.
- 52KHz fixed switching frequency.
- Voltage mode non-synchronous PWM control.
- Thermal-shutdown and current-limit protection.
- ON/OFF shutdown control input.
- Short Circuit Protect (SCP).
- Operating voltage can be up to 60V.
- Output load current: 2A.
- TO263-5L, TO220-5L and TO220-5LR Pb-Free packages.
- Low power standby mode.
- Built-in switching transistor on chip.
1/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Oct.15, 2010




AX3161 pdf, 반도체, 판매, 대치품
AX3161
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, TA=25°C, VCC=12V. ILOAD = 0.2A)
Characteristics
Symbol
Conditions
Quiescent Current
Feedback bias current
Shutdown supply Current
IQ
VFB=1.5V for Adjustable
version force driver off
IFB
VFB=1.3V
(Adjustable version only)
ISD
EN pin=5V
VCC=60V
Oscillator frequency
FOSC
Min Typ Max Units
- 4 8 mA
- -10 -50 nA
- 100 200 uA
40 52 65 KHz
Oscillator frequency of short
circuit protect
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
Current limit
FSCP (Adjustable) When VFB<0.5V
(Fixed)When < VOUT*40%
- 15 - KHz
- 15 - KHz
VFB=0V force driver on
DC VFB=1.5V for Adjustable
version force driver off
- 100 -
-0 -
%
ICL
Pear current, No outside circuit
V FB=0V force driver on
2.3
-
-
A
Load Regulation( VOUT/VOUT ) VOUT IOUT = 0.2 to 2A
Saturation voltage
SW pin leakage SW Pin=0V
current
SW Pin=-0.8V
VSA T
IOUT=2A, No outside circuit
VFB=0V force driver on
No outside circuit
ISW L
VFB=1.5V for Adjustable
version force driver off
VCC=60V force driver off
- 0.6 1.2 %
- 1.2 1.4 V
- - -200 uA
- -5 - mA
EN pin logic input threshold
voltage
VIL Low (regulator ON)
VIH High (regulator OFF)
- 0.6
1.3 V
2.0 -
EN pin logic input current
IH VEN=2.5V (OFF)
- -0.1 -10 uA
EN pin input current
IL VEN=0.5V (ON)
- -0.01 -1 uA
Thermal shutdown Temp
TSD
- 150 - °C
4/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Oct.15, 2010

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AX3161 전자부품, 판매, 대치품
AX3161
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 = 0.4A x 80m= 32mV
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 < 80m.
Thermal Considerations
The data for these curves was taken with the AX3161 operating as a buck-switching
regulator in an ambient temperature of 25°C (still air). These temperature increments are
all approximate and are affected by many factors. Higher ambient temperatures require
more heat sinker.
For the best thermal performance, wide copper traces and generous amounts of
printed circuit board copper (need connect to the VSS pins) should be used in the board
layout, (One exception is the SW(switch) pin, which should not have large areas of copper.)
Large areas of copper provide the best transfer of heat (lower thermal resistance) to the
surrounding air, and moving air lowers the thermal resistance even further.
Package thermal resistance and junction temperature increments are all approximate.
The increments are affected by a lot of factors. Some of these factors include board size,
shape, thickness, position, location, and even board temperature. Other factors are, trace
width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer
board and the amount of solder on the board.
The effectiveness of the PC board to dissipate heat also depends on the size,
quantity and spacing of other components on the board, as well as whether the
surrounding air is still or moving. Furthermore, some of these components such as the
catch diode will add heat to the PC board and the heat can vary as the input voltage
changes. For the inductor, depending on the physical size, type of core material and the
DC resistance, it could either act as a heat sink taking heat away from the board, or it could
add heat to the board.
7/11
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.1 Oct.15, 2010

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