- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361105 > NCV431AIDR2 (ON SEMICONDUCTOR) PROGRAMMABLE PRECISION REFERENCES PDF資料下載
參數(shù)資料
| 型號： | NCV431AIDR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | PROGRAMMABLE PRECISION REFERENCES |
| 中文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495 V, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 12/18頁 |
| 文件大小： | 173K |
| 代理商： | NCV431AIDR2 |
TL431, A, B Series, NCV431A
http://onsemi.com
12
Figure 31. Simplified TL431 Device Model
+
R
L
V
CC
C
L
15 k
9.0 F
Input
8.25 k
3
Cathode
500 k
V
ref
1.78 V
R
ref
16
G
M
Anode
2
R
GM
1.0 M
Ref
1
Go
1.0 mho
C
P2
0.265 pF
R
P2
10 M
R
Z1
15.9 k
C
P1
20 pF
f, FREQUENCY (Hz)
10
2
10
1
20
30
20
60
0
A
Figure 32. Example 1 Circuit Open Loop Gain Plot
Example 2.
I
C
= 7.5 mA, R
L
= 2.2 k , C
L
= 0.01 F. Cathode tied to
reference input pin. An examination of the data sheet
stability boundary curve (Figure 15) shows that this value of
load capacitance and cathode current is on the boundary.
Define the transfer gain.
The DC gain is:
TL431 OPENLOOP VOLTAGE GAIN VERSUS FREQUENCY
40
10
4
10
3
10
7
10
5
10
6
10
10
50
G
GMRGMGoRL
(2.323)(1.0 M)(1.25 )(2200)
The resulting open loop Bode plot is shown in Figure 33.
The asymptotic plot may be expressed as the following
equation:
6389
76 dB
Av
615
1
jf
500 kHz
1
jf
8.0 kHz
1
jf
60 kHz
1
jf
7.2 kHz
Note that the transfer function now has an extra pole
formed by the load capacitance and load resistance.
Note that the crossover frequency in this case is about
250 kHz, having a phase margin of about 46 degrees.
Therefore, instability of this circuit is likely.
f, FREQUENCY (Hz)
10
2
10
1
20
40
20
80
0
A
Figure 33. Example 2 Circuit Open Loop Gain Plot
With three poles, this system is unstable. The only hope
for stabilizing this circuit is to add a zero. However, that can
only be done by adding a series resistance to the output
capacitance, which will reduce its effectiveness as a noise
filter. Therefore, practically, in reference voltage
applications, the best solution appears to be to use a smaller
value of capacitance in low noise applications or a very
large value to provide noise filtering and a dominant pole
rolloff of the system.
TL431 OPENLOOP BODE PLOT WITH LOAD CAP
60
10
4
10
3
10
6
10
5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NCV4949 | 100 mA, 5.0 V, Low Dropout Voltage Regulator with Power-On Reset(100 mA, 5.0 V, 具有上電復(fù)位功能的低壓差穩(wěn)壓器) |
| NCV494 | SWITCHMODE Pulse Width Modulation Control Circuit(開關(guān)模式PWM控制器) |
| NCV51411 | 1.5A, 260kHz, Low Voltage Buck Regulator with Synchronization Capability(具有同步能力的1.5A, 260kHz,低壓降壓調(diào)整器) |
| NCV5500 | 500 mA Linear Regulator(500mA線性穩(wěn)壓器) |
| NCV5501 | 500 mA Linear Regulator(500mA線性穩(wěn)壓器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV431AIDR2G | 功能描述:基準電壓& 基準電流 2.5-36V ADJ 1-100mA RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| NCV431BVDMR2G | 功能描述:基準電壓& 基準電流 ANA 2.5V PROG SHUNT REF RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| NCV431BVDR2G | 功能描述:基準電壓& 基準電流 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| NCV47700DAJR2G | 制造商:ON Semiconductor 功能描述:ADJ V / 350MA LDO - Tape and Reel 制造商:ON Semiconductor 功能描述:REEL / ADJ V / 350MA LDO |
| NCV47700PDAJR2G | 功能描述:IC REG LDO ADJ .35A 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準包裝:2,000 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，可調(diào)式 輸出電壓:1.2 V ~ 5 V 輸入電壓:2.5 V ~ 7 V 電壓 - 壓降（標(biāo)準）:0.24V @ 800mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:800mA 電流 - 限制（最?。?1.2A 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-261-5，TO-261AB 供應(yīng)商設(shè)備封裝:SOT-223-5 包裝:帶卷 (TR) 其它名稱:*LP3964EMPX-ADJLP3964EMPX-ADJLP3964EMPX-ADJ-NDLP3964EMPX-ADJ/NOPBTR |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。