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参数资料
| 型号： | ADP2303-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ADP2303 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 电流 - 输出： | 3A |
| 输入电压： | 3 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 700kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP2303 |
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Data Sheet
ADP2302/ADP2303
22
20
V IN
VIN
18
16
M AXIMUM INPUT VOLTAG E
R EN1
ADP2302/
ADP2303
14
12
10
R EN2
EN
8
Figure 49. Precision Enable Used as a Programmable UVLO
6
4
2
0
2
M INIMUM INPUT VOLTAGE
4 6 8 10
12
14
16
The precision enable feature also allows the ADP2302/ADP2303 to
be sequenced precisely by using a resistive voltage divider from
V OUT (V)
Figure 47. Voltage Conversion Limitations
LOW INPUT VOLTAGE CONSIDERATIONS
For low input voltage between 3 V and 5 V, the internal boot
ADP2302/
ADP2303
regulator cannot provide enough bootstrap voltage due to the
internal dropout voltage. As a result, the increased MOSFET
R DS(ON) reduces the available load current. To prevent this, add
ANOTHER
DC/DC
SUPPLIER
R EN1
R EN2
EN
an external small-signal Schottky diode from a 5.0 V external
V STARTUP ? ? ?
? 1 . 2 μA ? ? ? R EN1 ? 1 . 2 V
bootstrap bias voltage. Because the absolute maximum rating
between the BST and SW pins is 6.0 V, the bias voltage should
be less than 5.5 V. Figure 48 shows the application diagram for
the external bootstrap circuit.
SCHOTTKY
3.0V ~ 5.0V DIODE
VIN BST
ADP2302/ 5V BIAS VOLTAGE
ADP2303
SW
Figure 50. Precision Enable Used as a Sequencing Control
from Another DC-to-DC Power Supply
With a 1.2 μA pull-down current on the EN pin, the equation for
the start-up voltage in Figure 49 and Figure 50 is
? 1 . 2 V ?
? R EN2 ?
where:
V STARTUP is the start-up voltage to enable the chip.
OFF
ON
EN
FB
R EN1 is the resistor from the dc source to EN.
R EN2 is the resistor from EN to GND.
? ? ?
( V IN ? V OUT ) ? V OUT ? V D ?
? I RIPPLE ?
?
GND
Figure 48. External Bootstrap Circuit for Low Input Voltage Application
PROGRAMMING THE PRECISION ENABLE
Generally, the EN pin can connect to the VIN pin so that the
device automatically starts up when the input power is applied.
However, the precision enabling feature allows the ADP2302/
ADP2303 to be used as a programmable UVLO by connecting
a resistive voltage divider to VIN, as shown in Figure 49. This
configuration prevents the start-up problems that can occur
when VIN ramps up slowly in soft start with a relatively high
load current.
INDUCTOR
The high switching frequency of the ADP2302/ADP2303 allows
the use of small inductors. For best performance, use inductor
values between 1 μH and 15 μH.
The peak-to-peak inductor ripple current is calculated using the
following equation:
?
L ? f sw ? V IN ? V D ?
where:
f SW is the switching frequency.
L is the inductor value.
V D is the diode forward drop.
V IN is the input voltage.
V OUT is the output voltage.
Inductors of smaller values are usually smaller in size but
increase the ripple current and the output ripple voltage. As a
guideline, the inductor peak-to-peak ripple current is typically
set to 30% of the maximum load current for optimal transient
Rev. A | Page 17 of 28
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| ADP2303-EVALZ | 制造商:Analog Devices 功能描述:ADP2303, DC TO DC REGULATOR, STEP DOWN, |
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