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| 型号： | SC431LISK-.5TRT |
| 厂商： | Semtech |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC VREF SHUNT ADJ SOT-23-3 |
| 标准包装： | 1 |
| 基准类型： | 分流器，可调式 |
| 输出电压： | 1.24 V ~ 16 V |
| 容差： | ±0.5% |
| 输入电压： | 1.24 V ~ 16 V |
| 通道数： | 1 |
| 电流 - 阴极： | 100µA |
| 电流 - 输出： | 100mA |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 标准包装 |
| 产品目录页面： | 1359 (CN2011-ZH PDF) |
| 其它名称： | SC431LISK-.5DKR |
SC431L
POWER MANAGEMENT
Applications Information - Stability
Selection of load capacitance when using SC431L as
a shunt regulator
When the SC431L is used as a shunt regulator, two
options for selection of C L (see diagram on page 7) are
recommended for optimal stability:
1) No load capacitance across the device, decouple at
the load.
2) Large capacitance across the device, optional
decoupling at the load.
The reason for this is that SC431L exhibits instability with
capacitances in the range of 10nF to 1μF (approx.) at
light cathode currents (up to 3mA typical). The device is
less stable the lower the cathode voltage has been set
for. Therefore while the device will be perfectly stable
operating at a cathode current of (say) 10mA with a 0.1μF
capacitor across it, it will oscillate transiently during start-
up as the cathode current passes through the instability
region. Selecting a very low (or preferably, no)
capacitance, or alternatively a high capacitance (such
as 10μF) will avoid this issue altogether. Since the user
will probably wish to have local decoupling at the load
anyway, the most cost effective method is to use no
capacitance at all directly across the device. PCB trace/
via resistance and inductance prevent the local load
decoupling from causing the oscillation during the
transient start-up phase. Note: if the SC431L is located
right at the load, so the load decoupling capacitor is
directly across it, then this capacitor will have to be ≤
1nF or ≥ 10μF.
? 2008 Semtech Corp.
8
www.semtech.com
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