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| 型号： | CS8126-1YT5 |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/9页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V .5A TO220-5 |
| 产品变化通告： | Product Discontinuation 03/Apr/2007 |
| 标准包装： | 50 |
| 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）： | 0.35V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 电流 - 限制（最小）： | 750mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 |
| 供应商设备封装： | TO-220-5 |
| 包装： | 管件 |
| 其它名称： | CS8126-1YT5OS |
CS8126
R Q JA +
150 ° C * TA
PD
Step 1: Place the completed circuit with a tantalum
capacitor of the recommended value in an environmental
chamber at the lowest specified operating temperature and
monitor the outputs with an oscilloscope. A decade box
connected in series with the capacitor will simulate the
higher ESR of an aluminum capacitor. Leave the decade box
outside the chamber, the small resistance added by the
longer leads is negligible.
Step 2: With the input voltage at its maximum value,
increase the load current slowly from zero to full load while
observing the output for any oscillations. If no oscillations
are observed, the capacitor is large enough to ensure a stable
design under steady state conditions.
Step 3: Increase the ESR of the capacitor from zero using the
decade box and vary the load current until oscillations
appear. Record the values of load current and ESR that cause
the greatest oscillation. This represents the worst case load
conditions for the regulator at low temperature.
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 q JA can be calculated:
(2)
The value of R q JA can then be compared with those in the
package section of the data sheet. Those packages with
R q 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.
Step 4: Maintain the worst case load conditions set in step
3 and vary the input voltage until the oscillations increase.
This point represents the worst case input voltage
conditions.
V IN
I IN
SMART
REGULATOR ?
I OUT
V OUT
Step 5: If the capacitor is adequate, repeat steps 3 and 4 with
the next smaller valued capacitor. A smaller capacitor will
usually cost less and occupy less board space. If the output
oscillates within the range of expected operating conditions,
repeat steps 3 and 4 with the next larger standard capacitor
value.
Step 6: Test the load transient response by switching in
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.
Step 7: Raise the temperature to the highest specified
operating temperature. Vary the load current as instructed in
step 5 to test for any oscillations.
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 14) is:
PD(max) + VIN(max) * VOUT(min) IOUT(max) ) VIN(max)IQ (1)
Control
Features
I Q
Figure 14. Single Output Regulator With Key
Performance Parameters Labeled
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 q JA .
R Q JA + R Q JC ) R Q CS ) R Q SA (3)
where:
R q JC = the junction ? to ? case thermal resistance,
R q CS = the case ? to ? heatsink thermal resistance, and
R q SA = the heatsink ? to ? ambient thermal resistance.
R q JC appears in the package section of the data sheet. Like
R q JA , it is a function of package type. R q CS and R q 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.
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CS8126-1YT5G | 功能描述:低压差稳压器 - LDO ANA 5V 750MA LIN 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 |
| CS8126-1YTHA5 | 功能描述:低压差稳压器 - LDO 5V 750mA 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 |
| CS8126-1YTHA5G | 功能描述:低压差稳压器 - LDO ANA 5V 750MA LIN 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 |
| CS8126-1YTHE5 | 功能描述:低压差稳压器 - LDO 5V 750mA 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 |
| CS8126-1YTHE5G | 功能描述:低压差稳压器 - LDO 5V 750mA w/Delayed Reset 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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