参数资料
| 型号： | IRU1030CMTR |
| 厂商： | International Rectifier |
| 文件页数： | 4/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 3A TO-263-3 |
| 标准包装： | 750 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 2.5 V ~ 3.3 V |
| 输入电压： | 最高 7V |
| 电压 - 压降（标准）： | 1.1V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3.1A |
| 工作温度： | 0°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-4，D²Pak（3 引线+接片），TO-263AA |
| 供应商设备封装： | TO-263 |
| 包装： | 带卷 (TR) |
IRU1030
Output Voltage Setting
The IRU1030 can be programmed to any voltages in the
range of 1.25V to 5.5V with the addition of R1 and R2
external resistors according to the following formula:
to the load side, the effective resistance between the
regulator and the load is gained up by the factor of (1+R2/
R1), or the effective resistance will be R P(eff) =R P 3 (1+R2/
R1). It is important to note that for high current applica-
(
) +I
V OUT = V REF 3 1+
Where:
R2
R1
ADJ 3 R2
tions, this can represent a significant percentage of the
overall load regulation and one must keep the path from
the regulator to the load as short as possible to mini-
mize this effect.
V REF = 1.25V Typically
I ADJ = 50 m A Typically
R1 and R2 as shown in Figure 3:
V IN
V IN
V OUT
PARASITIC LINE
RESISTANCE
R P
IRU1030
V IN
V IN
IRU1030
V OUT
V OUT
Adj
R1
R L
Adj
V REF
I ADJ = 50uA
R1
R2
R2
Figure 4 - Schematic showing connection
for best load regulation.
Figure 3 - Typical application of the IRU1030
for programming the output voltage.
The IRU1030 keeps a constant 1.25V between the out-
put pin and the adjust pin. By placing a resistor R1 across
these two pins a constant current flows through R1, add-
ing to the I ADJ current and into the R2 resistor producing
a voltage equal to the (1.25/R1) 3 R2 + I ADJ 3 R2 which
will be added to the 1.25V to set the output voltage.
This is summarized in the above equation. Since the
minimum load current requirement of the IRU1030 is
10mA, R1 is typically selected to be 121 V resistor so
that it automatically satisfies the minimum current re-
quirement. Notice that since I ADJ is typically in the range
of 50 m A it only adds a small error to the output voltage
and should only be considered when a very precise out-
put voltage setting is required. For example, in a typical
3.3V application where R1=121 V and R2=200 V the er-
ror due to I ADJ is only 0.3% of the nominal set point.
Load Regulation
Since the IRU1030 is only a three-terminal device, it is
not possible to provide true remote sensing of the output
voltage at the load. Figure 4 shows that the best load
regulation is achieved when the bottom side of R2 is
connected to the load and the top side of R1 resistor is
connected directly to the case or the V OUT pin of the
regulator and not to the load. In fact, if R1 is connected
Stability
The IRU1030 requires the use of an output capacitor as
part of the frequency compensation in order to make the
regulator stable. Typical designs for microprocessor ap-
plications use standard electrolytic capacitors with a
typical ESR in the range of 50 to 100m V and an output
capacitance of 500 to 1000 m F. Fortunately as the ca-
pacitance increases, the ESR decreases resulting in a
fixed RC time constant. The IRU1030 takes advantage
of this phenomena in making the overall regulator loop
stable. For most applications a minimum of 100 m F alu-
minum electrolytic capacitor such as Sanyo MVGX se-
ries, Panasonic FA series as well as the Nichicon PL
series insures both stability and good transient response.
Thermal Design
The IRU1030 incorporates an internal thermal shutdown
that protects the device when the junction temperature
exceeds the maximum allowable junction temperature.
Although this device can operate with junction tempera-
tures in the range of 150 8 C, it is recommended that the
selected heat sink be chosen such that during maxi-
mum continuous load operation the junction tempera-
ture is kept below this number. The example below
shows the steps in selecting the proper regulator heat
sink for the GTL+ terminator using a separate regulator
for each end.
4
www.irf.com
Rev. 1.3
08/20/02
相关PDF资料 |
PDF描述 |
|---|---|
| IRU1050-33CT | IC REG LDO 3.3V 5A TO-220-3 |
| IRU1050CM | IC REG LDO ADJ 5A TO-263-3 |
| IRU1075CPTR | IC CONV PENTIUM P55C 3-UTHINPAK |
| IRU1117-18CP | IC REG LDO 1.8V .8A UTHIN-2 |
| IRU1117-25CD | IC REG LDO 2.5V .8A TO-252 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IRU1030CT | 功能描述:IC REG LDO ADJ 3A TO-220 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:4V 输入电压:最高 16V 电压 - 压降（标准）:0.28V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:5-VFBGA 供应商设备封装:5-uSMD 包装:Digi-Reel® 其它名称:LP2985AIBP-4.0DKR |
| IRU1050 | 制造商:IRF 制造商全称:International Rectifier 功能描述:5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| IRU1050-33 | 制造商:IRF 制造商全称:International Rectifier 功能描述:5A LOW DROPOUT POSITIVE FIXED 3.3V REGULATOR |
| IRU1050-33CD | 功能描述:IC REG LDO 3.3V 5A D-PAK RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:4V 输入电压:最高 16V 电压 - 压降（标准）:0.28V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:5-VFBGA 供应商设备封装:5-uSMD 包装:Digi-Reel® 其它名称:LP2985AIBP-4.0DKR |
| IRU1050-33CDTR | 功能描述:IC REG LDO 3.3V 5A D-PAK RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:4V 输入电压:最高 16V 电压 - 压降（标准）:0.28V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:5-VFBGA 供应商设备封装:5-uSMD 包装:Digi-Reel® 其它名称:LP2985AIBP-4.0DKR |
发布紧急采购，3分钟左右您将得到回复。