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| 型号： | ADP2301-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADP2301 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 3.3V |
| 电流 - 输出： | 1.2A |
| 输入电压： | 3 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1.4MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2301 |
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? × I LOAD (max)
I DIODE ( AVG ) = ? ? 1 ? OUT
V IN + V D
?
?
Data Sheet
CATCH DIODE
The catch diode conducts the inductor current during the off
time of the internal MOSFET. The average current of the diode
in normal operation is, therefore, dependent on the duty cycle
of the regulator as well as the output load current.
? V + V D ?
?
where V D is the diode forward drop.
The only reason to select a diode with a higher current rating than
necessary in normal operation is for the worst-case condition, in
ADP2300/ADP2301
OUTPUT CAPACITOR
The output capacitor selection affects both the output voltage ripple
and the loop dynamics of the regulator. The ADP2300/ADP2301
are designed to operate with small ceramic capacitors that have low
equivalent series resistance (ESR) and equivalent series inductance
(ESL) and are, therefore, easily able to meet stringent output voltage
ripple specifications.
When the regulator operates in forced continuous conduction
mode, the overall output voltage ripple is the sum of the voltage
spike caused by the output capacitor ESR plus the voltage ripple
caused by charging and discharging the output capacitor.
? V RIPPLE = ? I RIPPLE × ? ?
?
?
which there is a shorted output. In this case, the diode current
increases up to the typical peak current-limit threshold. Be sure to
consult the diode data sheet to ensure that the diode can operate
?
?
1
8 × f sw × C OUT
+ ESR C OUT
?
?
ESR C OUT ≤
well within the thermal and electrical limits.
The reverse breakdown voltage rating of the diode must be higher
than the highest input voltage and allow an appropriate margin
for the ringing that may be present on the SW node. A Schottky
diode is recommended for best efficiency because it has a low
forward voltage drop and fast switching speed. Table 8 provides
a list of recommended Schottky diodes.
Table 8. Recommended Schottky Diodes
Capacitors with lower ESR are preferable to guarantee low
output voltage ripple, as shown in the following equation:
? V RIPPLE
? I RIPPLE
Ceramic capacitors are manufactured with a variety of dielectrics,
each with different behavior over temperature and applied voltage.
X5R or X7R dielectrics are recommended for best performance,
due to their low ESR and small temperature coefficients. Y5V
Vendor
ON Semiconductor
Diodes Inc.
Vishay
Part No.
MBRS230LT3
MBRS240LT3
B230A
B240A
SL23
SS24
V RRM
(V)
30
40
30
40
30
40
I AVG
(A)
2
2
2
2
2
2
and Z5U dielectrics are not recommended because of their poor
temperature and dc bias characteristics.
In general, most applications using the ADP2301 (1.4 MHz
switching frequency) require a minimum output capacitor value
of 10 μF, whereas most applications using the ADP2300 (700 kHz
switching frequency) require a minimum output capacitor value
of 20 μF. Some recommended output capacitors for V OUT ≤ 5.0 V
INPUT CAPACITOR
The input capacitor must be able to support the maximum input
operating voltage and the maximum rms input current. The
maximum rms input current flowing through the input
capacitor is I LOAD(max) /2. Select an input capacitor capable of
withstanding the rms input current for an application’s maxi-
mum load current using the following equation:
Table 9. Recommended Capacitors for V OUT ≤ 5.0 V
Dimensions
Vendor Value Part No. L × W × H (mm)
Murata 10 μF, 6.3 V GRM31MR60J106KE19 3.2 × 1.6 × 1.15
22 μF, 6.3 V GRM31CR60J226KE19 3.2 × 1.6 × 1.6
TDK 10 μF, 6.3 V C3216X5R0J106K 3.2 × 1.6 × 1.6
22 μF, 6.3 V C3216X5R0J226M 3.2 × 1.6 × 0.85
V + V D
V IN + V D
I IN ( RMS ) = I LOAD (max) × D × ( 1 ? D )
where D is the duty cycle and is equal to
D = OUT
The recommended input capacitor is ceramic with X5R or X7R
dielectrics due to its low ESR and small temperature coefficients.
A capacitance of 10 μF should be adequate for most applications.
To minimize supply noise, place the input capacitor as close to
the VIN pin of the ADP2300/ADP2301 as possible.
Rev. C | Page 19 of 28
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