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AOZ1019 데이터시트 PDF




Alpha and Omega Semiconductors에서 제조한 전자 부품 AOZ1019은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 AOZ1019 기능
기능 EZBuck 2A Simple Regulator
제조업체 Alpha and Omega Semiconductors
로고 Alpha and Omega Semiconductors 로고


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AOZ1019 데이터시트, 핀배열, 회로
AOZ1019
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EZBuck™ 2A Simple Regulator
General Description
The AOZ1019 is a high efficiency, simple to use, 2A buck
regulator. The AOZ1019 works from a 4.5V to 16V input
voltage range, and provides up to 2A of continuous
output current with an output voltage adjustable down to
0.8V.
The AOZ1019 comes in an SO-8 package and is rated
over a -40°C to +85°C ambient temperature range.
Features
4.5V to 16V operating input voltage range
130minternal PFET switch for high efficiency:
up to 95%
Internal soft start
Output voltage adjustable to 0.8V
2A continuous output current
Fixed 500kHz PWM operation
Cycle-by-cycle current limit
Short-circuit protection
Under voltage lockout
Output over voltage protection
Thermal shutdown
Small size SO-8 package
Applications
Point of load DC/DC conversion
PCIe graphics cards
Set top boxes
DVD drives and HDD
LCD panels
Cable modems
Telecom/Networking/Datacom equipment
Typical Application
VIN
C1
22µF
Ceramic
VIN
R2
20kΩ
C5
1nF
EN
AOZ1019
COMP
LX
FB
C2 AGND PGND
L1
4.7µH
VOUT
R2
C4, C6
22µF
Ceramic
R3
Rev. 1.0 September 2007
Figure 1. 3.3V/2A Buck Regulator
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AOZ1019 pdf, 반도체, 판매, 대치품
AOZ1019
Typical Performance Characteristics
Circuit of Figure 1. TA = 25°C, VIN = VEN = 12V, VOUT = 3.3V unless otherwise specified.
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Light Load (DCM) Operation
Full Load (CCM) Operation
Vin ripple
0.1V/div
Vo ripple
20mV/div
IL
1A/div
Vin ripple
0.1V/div
Vo ripple
20mV/div
IL
1A/div
LX
10V/div
LX
10V/div
1µs/div
1µs/div
Startup to Full Load
400µs/div
Vin
10V/div
Vo
1V/div
lin
0.5A/div
Full Load to Turnoff
400µs/div
Vin
10V/div
Vo
1V/div
lin
0.5A/div
50% to 100% Load Transient
Vo Ripple
50mV/div
100µs/div
lo
1A/div
Light Load to Turnoff
1s/div
Vin
5V/div
Vo
1V/div
lin
0.5A/div
Rev. 1.0 September 2007
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AOZ1019 전자부품, 판매, 대치품
AOZ1019
The combination of R2 and R3 should be large enough to
avoid drawing excessive current from the output, which
will cause power loss.
Since the switch duty cycle can be as high as 100%, the
maximum output voltage can be set as high as the input
voltage minus the voltage drop on upper PMOS and
inductor.
Protection Features
The AOZ1019 has multiple protection features to prevent
system circuit damage under abnormal conditions.
Over Current Protection (OCP)
The sensed inductor current signal is also used for over
current protection. Since the AOZ1019 employs peak
current mode control, the COMP pin voltage is propor-
tional to the peak inductor current. The COMP pin voltage
is limited to be between 0.4V and 2.5V internally. The
peak inductor current is automatically limited cycle by
cycle.
The cycle by cycle current limit threshold is set between
2.5A and 3.6A. When the load current reaches the cur-
rent limit threshold, the cycle by cycle current limit circuit
turns off the high side switch immediately to terminate
the current duty cycle. The inductor current stop rising.
The cycle by cycle current limit protection directly limits
inductor peak current. The average inductor current is
also limited due to the limitation on peak inductor current.
When cycle by cycle current limit circuit is triggered, the
output voltage drops as the duty cycle decreasing.
The AOZ1019 has internal short circuit protection to
protect itself from catastrophic failure under output short
circuit conditions. The FB pin voltage is proportional to
the output voltage. Whenever FB pin voltage is below
0.2V, the short circuit protection circuit is triggered.
As a result, the converter is shut down and hiccups at a
frequency equals to 1/8 of normal switching frequency.
The converter will start up via a soft start once the short
circuit condition disappears. In short circuit protection
mode, the inductor average current is greatly reduced
because of the low hiccup frequency.
Output Over Voltage Protection (OVP)
The AOZ1019 monitors the feedback voltage: when the
feedback voltage is higher than 960mV, it immediate
turns-off the PMOS to protect the output voltage over-
shoot at fault condition. When feedback voltage is lower
than 860mV, the PMOS is allowed to turn on in the next
cycle.
Power-On Reset (POR)
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A power-on reset circuit monitors the input voltage.
When the input voltage exceeds 4V, the converter starts
operation. When input voltage falls below 3.7V, the
converter will stop switching.
Schottky Diode Selection
The external freewheeling diode supplies the current to
the inductor when the high side PMOS switch is off. To
reduce the losses due to the forward voltage drop and
recovery of diode, Schottky diode is recommended to
use. The maximum reverse voltage rating of the chosen
Schottky diode should be greater than the maximum
input voltage, and the current rating should be greater
than the maximum load current.
Thermal Protection
An internal temperature sensor monitors the junction
temperature. It shuts down the internal control circuit and
high side PMOS if the junction temperature exceeds
150°C.
Application Information
The basic AOZ1019 application circuit is shown in
Figure 1. Component selection is explained below.
Input Capacitor
The input capacitor (C1 in Figure 1) must be connected
to the VIN pin and PGND pin of the AOZ1019 to maintain
steady input voltage and filter out the pulsing input
current. A small decoupling capacitor (Cd in Figure 1),
usually 1µF, should be connected to the VIN pin and
AGND pin for stable operation of the AOZ1019. The
voltage rating of input capacitor must be greater than
maximum input voltage plus ripple voltage.
The input ripple voltage can be approximated by equation
below:
V IN
=
-------I--O---------
×
1
-V-----O----
×
-V-----O----
f × CIN V INV IN
Since the input current is discontinuous in a buck
converter, the current stress on the input capacitor is
another concern when selecting the capacitor. For a buck
circuit, the RMS value of input capacitor current can be
calculated by:
ICIN_RMS = IO ×
-V-----O----
1
-V-----O----
V IN V IN
Rev. 1.0 September 2007
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