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| 型号： | NCP1086ST-ADJT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 1.5A SOT223 |
| 产品变化通告： | Product Discontinuation 27/Jun/2007 |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.25 V ~ 5.5 V |
| 输入电压： | 最高 7V |
| 电压 - 压降（标准）： | 1.05V @ 1.5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.5A |
| 电流 - 限制（最小）： | 1.6A |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223 |
| 包装： | 带卷 (TR) |
| 其它名称： | NCP1086ST-ADJT3OS |
NCP1086
Protection Diodes
When large external capacitors are used with a linear
regulator it is sometimes necessary to add protection diodes.
V IN
V IN
V OUT
R C
Conductor Parasitic
Resistance
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.
NCP1086
R LOAD
Figure 19. Conductor Parasitic Resistance Effects
Can Be Minimized with the Above Grounding
Scheme for Fixed Output Regulators
For the adjustable regulator, the best load regulation
RC
V IN
C 1
V IN
IN4002 (optional)
V OUT
NCP1086
Adj
R 1
C 2
V OUT
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
R1 ) R2
R1
R 2
where R C = conductor parasitic resistance.
Conductor Parasitic
Figure 17. Protection Diode Scheme for Large Output
Capacitors (Adjustable Output)
V IN
V IN
V OUT
NCP1086
Adj
R 1
R C
Resistance
R LOAD
IN4002 (optional)
V IN
C 1
V IN
NCP1086
GND
V OUT
C 2
V OUT
R 2
Figure 20. Grounding Scheme for the
Adjustable Output Regulator to Minimize
Parasitic Resistance Effects
Figure 18. Protection Diode Scheme for Large Output
Capacitors (3.3 V Fixed Output)
Calculating Power Dissipation and
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.
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1086ST-ADJT3G | 功能描述:低压差稳压器 - LDO 1.25-5.5V ADJ 1.5A Commercial Temp RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCP1086T-033 | 功能描述:低压差稳压器 - LDO 3.3V 1.5A RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCP1086T-033G | 功能描述:低压差稳压器 - LDO 3.3V 1.5A Commercial Temp RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCP1086T-33 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:1.5 A Adjustable and 3.3 V Fixed Output Linear Regulator |
| NCP1086T-ADJ | 功能描述:低压差稳压器 - LDO 1.25-5.5V ADJ 1.5A RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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