参数资料
| 型号： | LT3050MPMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .1A 12MSOP |
| 产品培训模块： | LT3050 - 100mA, Low Noise Linear Regulator With Precision Current Limit And Diagnostic Functions |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.6 V ~ 44.5 V |
| 输入电压： | 1.6 V ~ 45 V |
| 电压 - 压降（标准）： | 0.34V @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA |
| 电流 - 限制（最小）： | 110mA |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-TSSOP （0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 12-MSOP，裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3050 Series
OPERATION
I MON Pin Operation (Current Monitor)
The I MON pin is the collector of a PNP which mirrors the
LT3050 output PNP at a ratio of 1:100 (see block diagram
on page 11). The current sourced by the I MON pin is
~1/100 th of the current sourced by the OUT pin when the
I MON and OUT pin voltages are equal and the device is not
operating in dropout. If the I MON and OUT pin voltages
are not the same, the ratio deviates from 1/100 due to
the Early voltages of the I MON and OUT PNPs according
to the equation:
A small decoupling capacitor (22nF minimum) from I MON
to GND is required to improve I MON pin power supply
rejection. If the current monitor is not needed, it must be
tied to GND.
Open Circuit Detection (I MIN Pin)
The I MIN pin is the collector of a PNP which mirrors the
LT3050 output at a ratio of approximately 1:200 (see block
diagram on page 11). The I MIN fault comparator asserts
the FAULT pin if the I MIN pin voltage is below 0.6V. This
I IMON
1
70 V IN
V IMON
low output current fault threshold voltage (I OPEN ) is set
by attaching a resistor from I MIN to GND.
V OUT
1 444 IN 2 444
119 . 85 – ( 1 . 68 – 36 . 8 ? I OPEN OUT
I OUT
I MONR
70 V
3
Early Voltage Compensation
R IMIN =
I OPEN
)? V
where the Early voltage of the PNPs is 70V and I MONR is
a variable which represents the I OUT to I MON current ratio.
I MONR varies with V IN to V OUT voltage according to the
empirically derived equation:
I MONR = 97 + 5 ? log 10 (1+V IN – V OUT ) for (V IN – V OUT )
≥0.5
I MONR = 96 + 2 ? (V IN – V OUT ) for (V IN – V OUT ) < 0.5
The I MON pin current can be converted into a voltage for
use by monitoring circuitry simply by connecting the I MON
pin to a resistor.
Connecting a resistor from I MON to GND converts the
I MON pin current into a voltage that can be monitored by
circuitry such as an ADC.
For example, a 1.2k resistor results in a I MON pin voltage
of 1.2V for an output current of 100mA and an output
voltage of 1.2V.
The output current of the device can be calculated from
the I MON pin voltage by the following equation:
This equation is empirically derived and partially
compensates for early voltage effects in the I MIN current
mirror. It is valid for an input voltage range from 0.6V
above the output to 10V above the output. It is valid for
output voltages up to 12V. The accuracy of this equation
for setting the resistor value is approximately ±2%. Unit
values are Amps, Volts, and Ohms.
If the open circuit detection function is not needed, the I MIN
pin must be left ?oating (unconnected). A small decoupling
capacitor (10nF minimum) from I MIN to GND is required
to improve I MIN pin power supply rejection and to prevent
FAULT pin glitches.
See the Typical Performance Characteristics section for
additional information.
{
IOUT
123
V IMON
1 444 IN 2 444
I OUT
I MONR
Ratio
IMON
V IMON
R IMON
IIMON
70 V IN V OUT
70 V
3
Early VoltageCompensation
3050fa
15
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