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參數(shù)資料
| 型號： | APE8837HGN2-HF |
| 廠商： | ADVANCED POWER ELECTRONICS CORP |
| 元件分類： | 固定正電壓多路輸出LDO穩(wěn)壓器 |
| 英文描述： | DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PDSO6 |
| 封裝： | 2 X 2 MM, HALOGEN AND LEAD FREE, DFN-6 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大小： | 204K |
| 代理商： | APE8837HGN2-HF |
Advanced Power
Electronics Corp.
APE8837
Output Capacitor
Thermal Considerations
5
The APE8837 series can deliver a current of up to 200mA/channel over the full
operating junction temperature range. However, the maximum output current must be
debated at higher ambient temperature to ensure the junction temperature does not
exceed 125°C. With all possible conditions, the junction temperature must be within
the range specified under operating conditions. Power dissipation can be calculated
based on the output current and the voltage drop across regulator.
PD = (VIN - VOUT) IOUT + VIN x IGND
The final operating junction temperature for any set of conditions can be
estimated by the following thermal equation:
PD (MAX) = (TJ (MAX) - TA) / θJA
Where TJ (MAX) is the maximum junction temperature of the die (125°C) and TA is
the maximum ambient temperature. The junction to ambient thermal resistance (θJA)
SOT-26 package at recommended minimum footprint is 250°C/W.
The APE8837 is designed specifically to work with very small ceramic output
capacitors. A ceramic capacitor (temperature characteristics X7R, X5R) in 1μF is
suitable for the APE8837 application. The recommended minimum capacitance for the
device is 1μF, X5R or X7R dielectric ceramic, between VOUT and GND for stability,
but it may be increased without limit. Higher capacitance values help to improve
transient. The output capacitor's ESR is critical because it forms a zero to provide
phase lead which is required for loop stability.
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