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參數資料
| 型號： | LP3964 |
| 文件頁數： | 14/22頁 |
| 文件大小： | 479K |
| 代理商： | LP3964 |
Application Hints
(Continued)
has a built in hysteresis. The timing diagram in Figure 1
shows the relationship between the ERROR and the output
voltage. In this example, the input voltage is changed to
demonstrate the functionality of the Error Flag.
The internal Error flag comparator has an open drain output
stage. Hence, the ERROR pin should be pulled high through
a pull up resistor. Although the ERROR pin can sink current
of 1mA, this current is energy drain from the input supply.
Hence, the value of the pull up resistor should be in the
range of 100k
to 1M
.
The ERROR pin must be con-
nected to ground if this function is not used.
It should
also be noted that when the shutdown pin is pulled low, the
ERROR pin is forced to be invalid for reasons of saving
power in shutdown mode.
Sense Pin
In applications where the regulator output is not very close to
the load, LP3964 can provide better remote load regulation
using the SENSE pin. Figure 2 depicts the advantage of the
SENSE option. LP3961 regulates the voltage at the output
pin. Hence, the voltage at the remote load will be the regu-
lator output voltage minus the drop across the trace resis-
tance. For example, in the case of a 3.3V output, if the trace
resistance is 100m
, the voltage at the remote load will be
3.22V with 800mAmps of load current, I
. The LP3964
regulates the voltage at the sense pin. Connecting the sense
pin to the remote load will provide regulation at the remote
load, as shown in Figure 2 If the sense option pin is not
required, the sense pin must be connected to the V
OUT
pin.
10112907
FIGURE 1. Error Flag Operation
L
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LP3964EMP-1.8 | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP3964EMP-1.8 | 制造商:Texas Instruments 功能描述:V REG ULTRA-LDO +1.8V SMD 3964 |
| LP3964EMP-1.8/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO 800Ma Ultra-LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP3964EMP-2.5 | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP3964EMP-2.5 | 制造商:Texas Instruments 功能描述:V REG ULTRA-LDO +2.5V SMD 3964 |
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