- 您现在的位置：买卖IC网 > PDF目录17399 > ADP2302-EVALZ (Analog Devices Inc)EVAL BOARD FOR ADP2302 PDF资料下载
参数资料
| 型号： | ADP2302-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/28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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
?
V OUT ? 0 . 800 V ? ? ? 1 ? TOP
?
ADP2302/ADP2303
APPLICATIONS INFORMATION
ADIsimPower DESIGN TOOL
The ADP2302/ADP2303 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 OUTPUT VOLTAGE
ADP2302/ADP2303 have an adjustable version where the output
voltage is programmed through an external resistive divider, as
shown in Figure 45. Suggested resistor values for the typical
output voltage setting are listed in Table 6. The output voltages
are calculated using the following equation:
? R ?
? R BOT ?
where:
V OUT is the output voltage.
R TOP is the feedback resistor from V OUT to FB.
R BOT is the feedback resistor from FB to GND.
Data Sheet
for the worst case. By considering the variation of both the switch-
ing 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 280 ns in
ADP2302/ADP2303 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 voltage
for the desired output due to the internal dropout voltage. To
attain stable operation at light loads and ensure proper startup for
the prebiased condition, the ADP2302/ADP2303 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
ADP2302/
ADP2303
FB
R TOP
V OUT
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.
5.3
R BOT
Figure 45. Programming the Output Voltage Using a Resistive Voltage Divider
Table 6. Suggested Values for Resistive Voltage Divider
5.1
4.9
4.7
FOR START UP
V OUT (V)
1.2
R TOP (kΩ), ±1%
10
R BOT (kΩ), ±1%
20
4.5
4.3
1.5
1.8
2.5
3.3
5.0
10
12.7
21.5
31.6
52.3
11.3
10.2
10.2
10.2
10
4.1
3.9
3.7
3.5
WHILE IN
OPERATION
VOLTAGE CONVERSION LIMITATIONS
1
10 100
OUPTUT CURRENT (mA)
1000
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
Figure 46. Minimum Input Voltage vs. Load Current
Based on three conversion limitations (the minimum on time,
the minimum off time, and the bootstrap dropout voltage),
controllable minimum on time, which can be as high as 170 ns
Rev. A | Page 16 of 28
相关PDF资料 |
PDF描述 |
|---|---|
| AUIR33401STRR | IC SW IPS 1CH HIGH SIDE D2PAK-7 |
| RSC07DREI-S13 | CONN EDGECARD 14POS .100 EXTEND |
| LQH43CN3R3M03L | INDUCTOR 3.3UH 20% 800MA 1812 |
| SL22HE3/52T | DIODE SCHOTTKY 2A 20V SMB |
| AUIR33401STRL | IC SW IPS 1CH HIGH SIDE D2PAK-7 |
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 |
发布紧急采购，3分钟左右您将得到回复。