JAJSGH4A November 2018 – July 2019 LM25180-Q1
ADVANCE INFORMATION for pre-production products; subject to change without notice.
デバイスごとのパッケージ図は、PDF版データシートをご参照ください。
The LM25180-Q1 employs a unique thermal compensation circuit that adjusts the feedback setpoint based on the thermal coefficient of the flyback diode's forward voltage drop. Even though the output voltage is measured when the secondary current is effectively zero, there is still a non-zero forward voltage drop associated with the flyback diode. Select the thermal compensation resistor using Equation 9.
The temperature coefficient of the diode voltage drop may not be explicitly provided in the diode datasheet, so the effective value can be estimated based on the measured output voltage shift over temperature when the TC resistor is not installed.