CHT-STROMBOLI High-temperature,Medium-voltage isolated DC-DC Converter Application Note
■This document describes in details the implementation of a constant frequency current mode flyback isolated DC/DC converter CHT-STROMBOLI based on CISSOID’s high-temperature devices CHT-MAGMA, CHT-NMOS8010, CHT-NMOS4020 and CHT-SNMOS80. Small and medium signal diodes are created by using the bulk diode of high temperature MOSFET:
▲CHT-SNMOS80 with gate and source shorted.
■All CISSOID components are rated from -55℃ to +225℃ (Junction temperature. The CHT-STROMBOLI reference design is specified -55 to 175℃ with brief excursions to 225℃. The passive components are rated at +150℃ but will permit brief excursions above this value, with a reduced reliability.
■The CHT-STROMBOLI can be operated from 15V up to 40V and the implemented topology ensures a cycle-by-cycle current limitation, making the converter very robust to every fault condition present at the output.
■A voltage input comparator (Under Voltage Lockout) switches off the converter when operated below the minimum specified voltage. This provides a small input power and a reliable soft start under these conditions.
■Two symmetric outputs are provided and an accurate voltage feedback guarantees a high stability over the load or the input voltage variations, making the design very robust to all kind of external perturbations.
■The detailed performances of the CHT-STROMBOLI can be found in the related product datasheet. The global specifications are as follows:
▲ Input voltage range: 15 to 40V
▲ Output voltage: symmetrical +/-12V
▲ Output power: 25W
▲ Efficiency>70% at maximum power, over the whole temperature range
▲ 150kHz center frequency
■In the following sections it is assumed that the general theory of flyback current mode converters is known. The passive elements in each block will be described.
■Figure 1 shows a generic block diagram of CHT-STROMBOLI, along on the next pages the detailed schematics of the reference design, in figure 2. The next chapters of this document will describe in details the different functionalities.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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03-Dec-2010 |
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Version: 1.0 |
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AN-100768 |
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2.5 MB |
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