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| 型号： | NCV8509PDW18G |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/18页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V/1.8V 16-SOIC |
| 标准包装： | 47 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V，1.8V |
| 输入电压： | 最高 50V |
| 电压 - 压降（标准）： | 0.4V @ 100mA |
| 稳压器数量： | 2 |
| 电流 - 限制（最小）： | 115mA，105mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 管件 |
NCV8509 Series
≈ 10 μ s
V OUT1
V OUT2
≈ 10 μ s
Fast SLEW Rate >> Soft Start
Fast SLEW Rate >> Soft Start
Disable Time
Short On
V OUT1
Decay Time Dependent
on External Load
Disable Time
Short On
V OUT2
Decay Time Dependent
on External Load
Figure 52. Fault Response. Note the High SLEW Rate Coming Out of Fault Conditions.
Soft Start Only Applies to a Power Up Sequence.
I + C dv , t +
t +
+ 9.9 ms
Av + OUT
Av +
+ 3.9 V V
Slew Rate Control
Figure 53 shows the circuitry associated with Slew Rate
Control. The diagram highlights the control of one output for
simplicity. V OUT1 and V OUT2 are both controlled on the IC.
The slew rate capacitor (C SLEW ) is charged with an
on ? chip current source runing at 6.0 m A (typ.). Charging a
capacitor with a current source creates a linear voltage ramp
as shown in Figure 54.
The lowest voltage to the positive terminals of the
comparator (Error Amp) dominates the output voltage
(V OUT ). Consequently, when C SLEW is fully discharged on
power up, it is the dominant factor on the positive terminal
and disables the output. The output (V OUT ) follows the
linear ramp on the SLEW pin (after being gained up with R1
and R2) until V BG becomes the dominant voltage. This
occurs when SLEW = V BG + V D1 or approximately 1.8 V.
Internal
Slew time can be calculated using the standard capacitor
equation.
C( D V)
dt I
Using a 33 nF capacitor, the slew time is:
(33 nF)(1.8 V)
6 m A
The corresponding slew rate for this is 1.8 V/9.9 ms =
182 V/s ON THE SLEW PIN.
To calculate the slew rate on outputs, you must multiply
by the gain set up by R1 and R2.
V
1.28 V
For a 5 V output, the gain would be:
5V
1.28 V
Voltage
Rail ≈ 3.8 V
V IN1
assuming V BG = 1.28 V.
The resultant slew rate on the output is the slew rate on the
SLEW pin multiplied by the gain, or:
6.0 μ A
D2
(182 V s)
(3.9 V V) + 710 V s
SLEW
C SLEW
V BG
D1
+
+
?
Error Amp
V OUT
R1
3.8
1.8
Outputs in Regulation
R2
t SLEW
Figure 53. Slew Control Circuitry
http://onsemi.com
16
Time (ms)
Figure 54.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8509PDW18R2 | 功能描述:线性稳压器 - 标准 1.8V 100mA Sequenced RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| NCV8509PDW18R2G | 功能描述:线性稳压器 - 标准 1.8V 100mA Sequenced Dual RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| NCV8509PDW25 | 功能描述:线性稳压器 - 标准 2.5V 100mA Sequenced RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| NCV8509PDW25G | 功能描述:线性稳压器 - 标准 2.5V 100mA Sequenced Dual RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| NCV8509PDW25R2 | 功能描述:线性稳压器 - 标准 2.5V 100mA Sequenced RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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