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參數(shù)資料
| 型號： | NCV8501D100R2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Micropower 150 mA LDO Linear Regulators with ENABLE, DELAY, RESET, and Monitor FLAG |
| 中文描述： | 10 V FIXED POSITIVE LDO REGULATOR, 0.6 V DROPOUT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 119K |
| 代理商： | NCV8501D100R2 |
NCV8501 Series
http://onsemi.com
11
APPLICATION NOTES
Figure 17. Additional Output Current
NCV8501
V
IN
V
OUT
V
ADJ
C2
0.1 F
V
BAT
5.0 V
MJD31C
R1
294 k
R2
100 k
C1
47 F
>1 Amp
Adding Capability
Figure 17 shows how the adjustable version of parts can
be used with an external pass transistor for additional current
capability. The setup as shown will provide greater than 1
Amp of output current.
FLAG MONITOR
Figure 18 shows the FLAG Monitor waveforms as a result
of the circuit depicted in Figure 15. 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 18. FLAG Monitor Circuit Waveform
V
OUT
MON
RESET
FLAG Monitor
Ref. Voltage
T
WARNING
FLAG
Figure 19. Test and Application Circuit Showing
Output Compensation
V
IN
V
OUT
C
OUT
**
10 F
R
RST
RESET
C
IN
*
0.1 F
NCV8501
*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
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.
Assume reset Delay Low Voltage = 0.
Use the typical value for V
dt
= 1.8 V.
Use the typical value for Delay Charge Current = 2.5 A.
[33 nF(1.8
2.5 A
tDELAY
Reset Delay Low Voltage)]
tDELAY
0)]
23.8 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
manufacturers data sheet usually provides this information.
The value for the output capacitor C
OUT
shown in Figure 19
should work for most applications, however it is not
necessarily the optimized solution.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV8501D100R2G | 功能描述:低壓差穩(wěn)壓器 - LDO 10V 150mA w/ENABLE 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(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV8501D25 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 150mA w/ENABLE 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(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV8501D25G | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 150mA w/ENABLE 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(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV8501D25R2 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 150mA w/ENABLE 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(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| NCV8501D25R2G | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 150mA w/ENABLE 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(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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