参数资料
| 型号： | CS8221YDPR3G |
| 厂商： | ON Semiconductor |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .1A D2PAK-3 |
| 产品变化通告： | Product Obsolescence 19/Dec/2008 |
| 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 @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA |
| 电流 - 限制（最小）： | 125mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-4，D²Pak（3 引线+接片），TO-263AA |
| 供应商设备封装： | D2PAK-3 |
| 包装： | 带卷 (TR) |
CS8221
Once the minimum capacitor value with the maximum
ESR is found, a safety factor should be added to allow for the
tolerance of the capacitor and any variations in regulator
performance. Most good quality aluminum electrolytic
capacitors have a tolerance of ± 20% so the minimum value
found should be increased by at least 50% to allow for this
tolerance plus the variation which will occur at low
temperatures. The ESR of the capacitor should be less than
50% of the maximum allowable ESR found in step 3 above.
CALCULATING POWER DISSIPATION IN A SINGLE
OUTPUT LINEAR REGULATOR
The maximum power dissipation for a single output
regulator (Figure 5) is:
PD(max) + VIN(max) * VOUT(min) IOUT(max) ) VIN(max)IQ (1)
where:
V IN(max) is the maximum input voltage,
V OUT(min) is the minimum output voltage,
I OUT(max) is the maximum output current for the
application, and
I Q is the quiescent current the regulator consumes at
I OUT(max) .
Once the value of P D(max) is known, the maximum
permissible value of R Θ JA can be calculated:
HEAT SINKS
A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and the
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed to
determine the value of R Θ JA .
R Q JA + R Q JC ) R Q CS ) R Q SA (3)
where:
R Θ JC = the junction ? to ? case thermal resistance,
R Θ CS = the case ? to ? heatsink thermal resistance, and
R Θ SA = the heatsink ? to ? ambient thermal resistance.
R Θ JC appears in the package section of the data sheet. Like
R Θ JA , it too is a function of package type. R Θ CS and R Θ SA
are functions of the package type, heatsink and the interface
between them. These values appear in heat sink data sheets
of heat sink manufacturers.
R Q JA +
150C * TA
PD
(2)
The value of R Θ JA can then be compared with those in the
package section of the data sheet. Those packages with
R Θ JA ’s less than the calculated value in equation 2 will keep
the die temperature below 150 ° C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
V IN
I IN
I OUT
V OUT
CS8221
I Q
Figure 5. Single Output Regulator With Key
Performance Parameters Labeled
http://onsemi.com
5
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