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參數(shù)資料
| 型號： | AOZ1010AI |
| 廠商： | ALPHA |
| 英文描述： | EZBuck TM 2A Simple Buck Regulator |
| 中文描述： | EZBuck商標2A條簡單的降壓穩(wěn)壓器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 577K |
| 代理商： | AOZ1010AI |
^lwNMNM
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 AOZ1010 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 AOZ1010 employs peak
current mode control, the COMP pin voltage is
proportional 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
current 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 AOZ1010 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.
Power-On Reset (POR)
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.
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 145oC. The regulator will restart automatically
under the control of soft-start circuit when the junction
temperature decreases to 100oC.
February 2006
www.aosmd.com
Page 9 of 16
Application Information
The basic AOZ1010 application circuit is shown in
Figure 1. Component selection is explained below.
Input capacitor
The input capacitor must be connected to the V
pin
and PGND pin of the AOZ1010 to maintain steady input
voltage and filter out the pulsing input current. 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:
I
V
×
×
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:
IN
O
IN
O
IN
O
C
IN
V
V
V
V
f
×
=
)
1
)
1
_
IN
O
IN
O
O
RMS
CIN
V
V
V
V
I
I
×
=
if let
m
equal the conversion ratio:
m
V
V
IN
O
=
The relation between the input capacitor RMS current
and voltage conversion ratio is calculated and shown in
Fig. 2 below. It can be seen that when V
is half of V
,
C
is under the worst current stress. The worst current
stress on C
IN
is 0.5·I
O
.
0
0
0.5
m
1
0
0.1
0.2
0.3
0.4
0.5
0.5
0
ICIN_RMSm
IO
( )
1
Figure 2. I
CIN
vs. voltage conversion ratio
For reliable operation and best performance, the input
capacitors must have current rating higher than I
at
worst operating conditions. Ceramic capacitors are
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