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參數資料
| 型號： | NCV8512 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG |
| 中文描述： | 5.0V的微一百五十零毫安LDO線性穩(wěn)壓器的延遲，可調復位和監(jiān)視標志 |
| 文件頁數： | 8/10頁 |
| 文件大?。?/td> | 106K |
| 代理商： | NCV8512 |
NCV8512
http://onsemi.com
8
2. After a reset event has occurred and the device is
back in regulation. The DELAY capacitor is
discharged when the regulation (RESET threshold)
has been violated. When the DELAY capacitor
discharges to 0.45 V, the RESET signal pulls low.
FLAG/Monitor Function
An onchip comparator is available to provide an early
warning to the microprocessor of a possible reset signal. The
reset signal typically turns the microprocessor off
instantaneously. This can cause unpredictable results with
the microprocessor. The signal received from the FLAG pin
will allow the microprocessor time to complete its present
task before shutting down. This function is performed by a
comparator referenced to the bandgap voltage. The actual
trip point can be programmed externally using a resistor
divider to the input monitor (MON) (Figure 13). The typical
threshold is 1.20 V on the MON Pin.
Figure 13. FLAG/Monitor Function
V
BAT
V
IN
MON
V
OUT
C
OUT
V
CC
I/O
RESET
P
FLAG
RESET
GND
Delay
NCV8512
R
ADJ
R
FLG
R
RST
R
M1
R
M2
APPLICATION NOTES
FLAG MONITOR
Figure 14 shows the FLAG Monitor waveforms taken
from the circuit depicted in Figure 13. As the output voltage
falls (V
OUT
), the Monitor threshold is crossed. This causes
the voltage on the FLAG output to go low sending a warning
signal to the microprocessor that a RESET signal may occur
in a short period of time. T
WARNING
is the time the
microprocessor has to complete the function it is currently
working on and get ready for the RESET shutdown signal.
Figure 14. FLAG Monitor Circuit Waveform
V
OUT
MON
RESET
FLAG Monitor
Ref. Voltage
T
WARNING
FLAG
SETTING THE DELAY TIME
The delay time is controlled by the Reset Delay Low
Voltage, Delay Switching Threshold, and the Delay Charge
Current. The delay follows the equation:
[CDELAY(VDT
Delay Charge Current
Example:
Using C
DELAY
= 33 nF.
Use the typical value for Delay Low Voltage = 0.04 V.
tDELAY
Reset Delay Low Voltage)]
Use the typical value for V
DT
= 1.8 V.
Use the typical value for Delay Charge Current = 9.0 A.
[33 nF(1.8
9.0 A
tDELAY
0.04 V)]
6.45 ms
STABILITY CONSIDERATIONS
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: startup delay,
load transient response and loop stability.
The capacitor value and type should be based on cost,
availability, size and temperature constraints. A tantalum or
aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR can cause
instability. The aluminum electrolytic capacitor is the least
expensive solution, but, if the circuit operates at low
temperatures (25
°
C to 40
°
C), both the value and ESR of
the capacitor will vary considerably. The capacitor
manufacturer’s data sheet usually provides this information.
The value for the output capacitor C
OUT
shown in Figure 15
should work for most applications, but is not necessarily the
optimized solution.
Figure 15. Test and Application Circuit Showing
Output Compensation
V
IN
V
OUT
C
OUT
**
10 F
R
RST
RESET
C
IN
*
0.1 F
NCV8512
*C
IN
required if regulator is located far from the power supply filter.
**C
OUT
required for stability. Capacitor must operate at minimum
temperature expected.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NCV8512PW50G | 功能描述:低壓差穩(wěn)壓器 - LDO 5V MICROPOWER 150mA 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 |
| NCV8512PW50R2G | 功能描述:低壓差穩(wěn)壓器 - LDO 5V MICROPOWER 150mA 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 |
| NCV8518 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:AC-DC Offline Switching Controllers/Regulators |
| NCV8518A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Low Dropout Linear Regulator with Watchdog, Wake Up, RESET, and ENABLE |
| NCV8518APDG | 功能描述:低壓差穩(wěn)壓器 - LDO LINEAR VLT REGULATOR 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 |
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