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参数资料
| 型号： | ADP2302-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ADP2302 |
| 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： | 2A |
| 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： | ADP2302 |
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ADP2302/ADP2303
DESIGN EXAMPLE
This section provides the procedures to select the external compo-
Data Sheet
The inductor peak current is calculated using the following
equation:
Because the output current is 3 A, the ADP2303 is chosen for
this application.
Table 10. Step-Down DC-to-DC Regulator Requirements
I PEAK ? I LOAD (max) ?
where:
I LOAD(max) = 3 A.
? I RIPPLE
2
Parameter
Input Voltage, V IN
Output Voltage, V OUT
Programmable
UVLO Voltage
PGOOD
Specification
12.0 V ± 10%
3.3 V, 3 A, 1% V OUT ripple
at full load condition
V IN start-up voltage
approximately 7.8 V
Not used
Additional
Requirements
None
None
None
None
Δ I RIPPLE = 0.7 A.
The calculated peak current for the inductor is 3.4 A. Therefore,
in this application, select VLF10040T-4R7N5R4 as the inductor.
OUTPUT CAPACITOR SELECTION
Select the output capacitor based on the minimum output
voltage ripple requirement, according to the following equation:
? V RIPPLE ? ? I RIPPLE ? ? ?
?
?
CATCH DIODE SELECTION
Select the catch diode. A Schottky diode is recommended for best
efficiency because it has a low forward voltage drop and faster
switching speed. The average current of the catch diode in
normal operation, with a typical Schottky diode forward
voltage, can be calculated using the following equation:
? 1
? 8 ? f sw ? C OUT
where:
ΔI RIPPLE = 0.7 A.
f SW = 700 kHz.
Δ V RIPPLE = 33 mV (1% of output voltage).
? ESR C OUT
?
?
I DIODE ( AVG ) ? ? ? 1 ? OUT
V IN ? V D
? ? I LOAD (max)
?
where:
V OUT = 3.3 V.
V IN = 12 V.
I LOAD(max) = 3 A.
? V ? V D
?
?
?
If ESR of the ceramic capacitor is 3 mΩ, then C OUT = 4 μF.
Because the output capacitor is one of two external components
that control the loop stability and according to the recommended
external components in Table 11, choose two 47 μF capacitor
with a 6.3 V voltage rating in this application.
RESISTIVE VOLTAGE DIVIDER SELECTION
V OUT ? 0 . 800 V ? ? ? 1 ? TOP
?
?
V D = 0.4 V.
Therefore, I DIODE(AVG) = 2.1 A.
In this case, selecting a SSB43L, 4.0 A, 30 V surface-mount
Schottky diode results in more reliable operation.
INDUCTOR SELECTION
Select the inductor by using the following equation:
The output feedback resistive voltage divider is
? R ?
? R BOT ?
For the 3.3 V output voltage, choose R TOP = 31.6 kΩ and
R BOT = 10.2 kΩ as the feedback resistive voltage divider
? V IN ? V OUT ?
? ? ? OUT
V IN ? V D
?
?
? 1 . 2 μA ? ? ? R EN1 ? 1 . 2 V
V STARTUP ? ??
L ?
0 . 3 ? I LOAD (max) ? f sw
where:
V OUT = 3.3 V.
V IN = 12 V.
I LOAD(max) = 3 A.
V D = 0.4 V.
? V ? V D
?
?
?
The resistive voltage divider for the programmable V IN start-up
voltage is
? 1 . 2 V ?
? R EN2 ?
If V STARTUP = 7.8 V, choose R EN2 = 10.2 kΩ, and then calculate
R EN1 , which, in this case, is 56 kΩ.
f SW = 700 kHz.
This results in L = 4.12 μH. The closest standard value is 4.7 μH;
therefore, ΔI RIPPLE = 0.7 A.
Rev. A | Page 20 of 28
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP2303 | 制造商:AD 制造商全称:Analog Devices 功能描述:Quad-Channel, 12-Bit, Serial Input, 4 mA to 20 mA |
| ADP2303ACPZ-R7 | 制造商:Analog Devices 功能描述:ADP2303 3A, 20V NON-SYNC STEP-DOWN DC-DC CONVERTER - Tape and Reel |
| ADP2303ARDZ | 功能描述:IC REG BUCK ADJ 3A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| ADP2303ARDZ-2.5 | 制造商:Analog Devices 功能描述: |
| ADP2303ARDZ-2.5-R7 | 功能描述:IC REG BUCK 2.5V 3A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
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