参数资料
| 型号： | CS8391YDPR5 |
| 厂商： | ON Semiconductor |
| 文件页数： | 4/6页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .25A/.1A D2PAK-5 |
| 产品变化通告： | Product Obsolescence 30/Dec/2003 |
| 标准包装： | 750 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 6 V ~ 26 V |
| 电压 - 压降（标准）： | 0.4V @ 250mA，0.4V @ 100mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 250mA，100mA |
| 电流 - 限制（最小）： | 260mA，105mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 供应商设备封装： | D2PAK-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | CS8391YDPR5OS |
CS8391
DEFINITION OF TERMS
Current Limit ? Peak current that can be delivered to the
output.
Dropout Voltage ? The input?output voltage differential
at which the circuit ceases to regulate against further
reduction in input voltage. Measured when the output
voltage has dropped 100 mV from the nominal value
obtained at 14 V input, dropout voltage is dependent upon
load current and junction temperature.
Input Output Differential ? The voltage difference
between the unregulated input voltage and the regulated
output voltage for which the regulator will operate.
Input Voltage ? The DC voltage applied to the input
terminals with respect to ground.
Line Regulation ? The change in output voltage for a
change in the input voltage. The measurement is made under
conditions of low dissipation or by using pulse techniques
such that the average chip temperature is not significantly
affected.
Load Regulation ? The change in output voltage for a
change in load current at constant chip temperature.
Long Term Stability ? Output voltage stability under
accelerated life?test conditions after 1000 hours with
maximum rated voltage and junction temperature.
Quiescent Current ? The part of the positive input
current that does not contribute to the positive load current,
i.e., the regulator ground lead current.
Ripple Rejection ? The ratio of the peak?to?peak input
ripple voltage to the peak?to?peak output ripple voltage.
Short Circuit Current Limit ? Peak current that can be
delivered by the output when forced to 0 V.
Temperature Stability of V OUT ? The percentage
change in output voltage for a thermal variation from room
temperature to either temperature extreme.
V IN
14 V
45 V
3.0 V
26 V
14 V
ENABLE
2.0 V
0.8 V
5.0 V
5.0 V
5.0 V
5.0 V
5.0 V
5.0 V
2.4 V
V OUT1
0V
0V
0V
0V
V OUT2 5.0 V
5.0 V
5.0 V
2.4 V
5.0 V
5.0 V
0V
5.0 V
5.0 V
System
Condition
Turn
On
Load
Dump
Low V IN
Line
Noise, Etc.
V OUT1
Short
V OUT2
Short
Thermal
Shutdown
Turn
Off
Circuit
Figure 2. Typical Circuit Waveform
APPLICATION NOTES
Circuit
General
The CS8391 is a Micropower dual 5.0 V regulator. All
bias required to operate the internal circuitry is derived from
the standby output, V OUT2 . If this output experiences an
over current situation and collapses, then V OUT1 will also
collapse (see Figure 2).
If there is critical circuitry that must remain active under
most conditions it should be connected to V OUT2 . Any
circuitry that is likely to be subjected to a short circuit, e.g.,
circuitry outside the module, should be connected to V OUT1 .
External Capacitors
Output capacitors are required for stability with the
CS8391. Without them, the regulator outputs will oscillate.
Actual size and type may vary depending upon the
application load and temperature range. Capacitor effective
series resistance (ESR) is also a factor in the IC stability.
Worst?case is determined at the minimum ambient
temperature and maximum load expected.
Output capacitors can be increased in size to any desired
value above the minimum. One possible purpose of this
would be to maintain the output voltages during brief
conditions of negative input transients that might be
characteristic of a particular system.
Capacitors must also be rated at all ambient temperatures
expected in the system. To maintain regulator stability down
to ?40 ° C, capacitors rated at that temperature must be used.
More information on capacitor selection for SMART
REGULATOR ? s is available in the SMART REGULATOR
application note, “Compensation for Linear Regulators,”
document number SR003AN/D, available through the
Literature Distribution Center or via our website at
http://www.onsemi.com.
http://onsemi.com
4
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