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參數(shù)資料
| 型號(hào)： | NCV8503PWADJR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Micropower 400 mA LDO Linear Regulators with ENABLE, DELAY, Adjustable RESET, and General Use Comparator |
| 中文描述： | 1.261 V-1.339 V ADJUSTABLE POSITIVE LDO REGULATOR, 0.6 V DROPOUT, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 106K |
| 代理商： | NCV8503PWADJR2 |
NCV8503 Series
http://onsemi.com
10
Voltage Adjust
Figure 17 shows the device setup for a user configurable
output voltage. The feedback to the V
ADJ
pin is taken from
a voltage divider referenced to the output voltage. The loop
is balanced around the Unity Gain threshold (1.30 V
typical).
Figure 17. Adjustable Output
Voltage
V
OUT
V
ADJ
NCV8503
15 k
5.1 k
C
OUT
≈
5.0 V
1.28 V
APPLICATION NOTES
FLAG MONITOR
Figure 18 shows the FLAG Monitor waveforms as a result
of the circuit depicted in Figure 16. As the input voltage falls
(V
MON
), the Monitor threshold is crossed. This causes the
voltage on the FLAG output to go low.
Figure 18. FLAG Monitor Circuit Waveform
V
MON
MON
Flag Monitor
Ref. Voltage
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.
Assume reset Delay Low Voltage = 0.
Use the typical value for V
dt
= 1.8 V (2.5 V, 3.3 V, and
5.0 V options).
Use the typical value for Delay Charge Current = 4.2
μ
A.
[33 nF(1.8
4.2 A
tDELAY
Reset Delay Low Voltage)]
tDELAY
0)]
14 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.
Figure 19. Test and Application Circuit Showing
Output Compensation
V
IN
V
OUT
C
OUT
**
33
μ
F
R
RST
RESET
C
IN
*
0.1
μ
F
NCV8503
*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(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV8503PWADJR2G | 功能描述:低壓差穩(wěn)壓器 - LDO 400mA ADJ 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(dòng)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 |
| NCV8504 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Micropower 400 mA LDO Linear Regulators with DELAY, Adjustable RESET, and General Use Comparator |
| NCV8504_07 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Micropower 400 mA LDO Linear Regulators with DELAY, Adjustable RESET, and General Use Comparator |
| NCV8504PW25 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 400mA w/Delay 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(dòng)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 |
| NCV8504PW25G | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 400mA w/Delay 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(dòng)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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