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| 型号： | ADP2301-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/28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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?
V OUT = 0 . 800 V × ? ? 1 + FB 1
R FB 2
?
?
ADP2300/ADP2301
APPLICATIONS INFORMATION
ADIsimPower DESIGN TOOL
The ADP2300/ADP2301 are supported by the ADIsimPower
design tool set. ADIsimPower is a collection of tools that produce
complete power designs optimized for a specific design goal.
The tools enable the user to generate a full schematic and bill of
materials, and calculate performance in minutes. ADIsimPower
can optimize designs for cost, area, efficiency, and parts count
while taking into consideration the operating conditions and
limitations of the IC and all real external components. For
more information about ADIsimPower design tools, refer to
www.analog.com/ADIsimPower . The tool set is available from
this website, and users can request an unpopulated board
through the tool.
PROGRAMMING THE OUTPUT VOLTAGE
The output voltage of the ADP2300/ADP2301 is externally set by
a resistive voltage divider from the output voltage to the FB pin,
as shown in Figure 42. Suggested resistor values for the typical
output voltage setting are listed in Table 6. The equation for the
output voltage setting is
? R ?
?
where:
V OUT is the output voltage.
R FB1 is the feedback resistor from V OUT to FB.
R FB2 is the feedback resistor from FB to GND.
Data Sheet
VOLTAGE CONVERSION LIMITATIONS
There are both lower and upper output voltage limitations for a
given input voltage due to the minimum on time, the minimum
off time, and the bootstrap dropout voltage.
The lower limit of the output voltage is constrained by the finite,
controllable minimum on time, which can be as high as 135 ns for
the worst case. By considering the variation of both the switching
frequency and the input voltage, the equation for the lower limit
of the output voltage is
V OUT (min) = t MIN - ON × f SW (max) × ( V IN (max) + V D ) ? V D
where:
V IN(max) is the maximum input voltage.
f SW(max ) is the maximum switching frequency for the worst case.
t MIN-ON is the minimum controllable on time.
V D is the diode forward drop.
The upper limit of the output voltage is constrained by the mini-
mum controllable off time, which can be as high as 120 ns in
the ADP2301 for the worst case. By considering the variation of
both the switching frequency and the input voltage, the equation
for the upper limit of the output voltage is
V OUT (max) = ( 1 ? t MIN - OFF × f SW (max) ) × ( V IN (min) + V D ) ? V D
where:
V IN(min) is the minimum input voltage.
f SW(max) is the maximum switching frequency for the worst case.
V D is the diode forward drop.
t MIN-OFF is the minimum controllable off time.
In addition, the bootstrap circuit limits the minimum input
ADP2300/
ADP2301
FB
R FB1
R FB2
V OUT
voltage for the desired output due to internal dropout voltage.
To attain stable operation at light loads and ensure proper startup
for the prebias condition, the ADP2300/ADP2301 require the
voltage difference between the input voltage and the regulated
output voltage (or between the input voltage and the prebias
voltage) to be greater than 2.1 V for the worst case. If the voltage
Figure 42. Programming the Output Voltage Using a Resistive Voltage Divider
Table 6. Suggested Values for Resistive Voltage Divider
V OUT (V) R FB1 (kΩ), ±1% R FB2 (kΩ), ±1%
1.2 4.99 10
difference is smaller, the bootstrap circuit relies on some minimum
shows the typical required minimum input voltage vs. load current
for the 3.3 V output voltage.
1.8
2.5
3.3
5.0
12.7
21.5
31.6
52.3
10.2
10.2
10.2
10
Rev. C | Page 16 of 28
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP2302 | 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 |
| ADP2302_12 | 制造商:AD 制造商全称:Analog Devices 功能描述:2 A/3 A, 20 V, 700 kHz, Nonsynchronous Step-Down Regulators |
| ADP2302ARDZ | 功能描述:IC REG BUCK ADJ 2A 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| ADP2302ARDZ-2.5 | 制造商:Analog Devices 功能描述: |
| ADP2302ARDZ-2.5-R7 | 功能描述:IC REG BUCK 2.5V 2A 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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