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參數資料
| 型號： | NCP1086ST-33T3 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1.5 A Adjustable and 3.3 V Fixed Output Linear Regulator |
| 中文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 1.4 V DROPOUT, PDSO3 |
| 封裝： | TO-261, SOT-223, 4 PIN |
| 文件頁數： | 7/14頁 |
| 文件大小： | 102K |
| 代理商： | NCP1086ST-33T3 |
NCP1086
http://onsemi.com
7
Protection Diodes
When large external capacitors are used with a linear
regulator it is sometimes necessary to add protection diodes.
If the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator. The
discharge current depends on the value of the capacitor, the
output voltage and the rate at which V
IN
drops. In the
NCP1086 series linear regulator, the discharge path is
through a large junction and protection diodes are not
usually needed. If the regulator is used with large values of
output capacitance and the input voltage is instantaneously
shorted to ground, damage can occur. In this case, a diode
connected as shown in Figure 17 or Figure 18 is
recommended.
Figure 17. Protection Diode Scheme for Large Output
Capacitors (Adjustable Output)
C
2
V
OUT
V
IN
C
1
V
IN
V
OUT
Adj
NCP1086
IN4002 (optional)
C
Adj
R
1
R
2
Figure 18. Protection Diode Scheme for Large Output
Capacitors (3.3 V Fixed Output)
C
2
V
OUT
V
IN
C
1
V
IN
V
OUT
GND
NCP1086
IN4002 (optional)
Output Voltage Sensing
Since the NCP1086 is a three terminal regulator, it is not
possible to provide true remote load sensing. Load
regulation is limited by the resistance of the conductors
connecting the regulator to the load.
For best results the fixed output regulator should be
connected as shown in Figure 19.
Figure 19. Conductor Parasitic Resistance Effects
Can Be Minimized with the Above Grounding
Scheme for Fixed Output Regulators
V
IN
V
IN
V
OUT
NCP1086
Conductor Parasitic
Resistance
R
LOAD
R
C
For the adjustable regulator, the best load regulation
occurs when R1 is connected directly to the output pin of the
regulator as shown in Figure 20. If R1 is connected to the
load, R
C
is multiplied by the divider ratio and the effective
resistance between the regulator and the load becomes
RC
R1
R2
R1
where R
C
= conductor parasitic resistance.
Figure 20. Grounding Scheme for the
Adjustable Output Regulator to Minimize
Parasitic Resistance Effects
V
IN
V
IN
V
OUT
Adj
NCP1086
Conductor Parasitic
Resistance
R
1
R
LOAD
R
2
R
C
Calculating Power Dissipation and
Heatsink Requirements
The NCP1086 linear regulator includes thermal shutdown
and current limit circuitry to protect the device. High power
regulators such as these usually operate at high junction
temperatures so it is important to calculate the power
dissipation and junction temperatures accurately to ensure
that an adequate heatsink is used.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP1086ST-33T3G | 功能描述:低壓差穩(wěn)壓器 - LDO 3.3V 1.5A Commercial Temp 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 |
| NCP1086ST-ADJT3 | 功能描述:低壓差穩(wěn)壓器 - LDO 1.25-5.5V ADJ 1.5A 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 |
| NCP1086ST-ADJT3G | 功能描述:低壓差穩(wěn)壓器 - LDO 1.25-5.5V ADJ 1.5A Commercial Temp 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 |
| NCP1086T-033 | 功能描述:低壓差穩(wěn)壓器 - LDO 3.3V 1.5A 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 |
| NCP1086T-033G | 功能描述:低壓差穩(wěn)壓器 - LDO 3.3V 1.5A Commercial Temp 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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