Title: Part No. L6203
Introduction:
The highly or most used L6203 grants for advanced LED driver models or full bridge driver with approximately 25% less components compared to comparable solutions which require separate PFC and resonant ICs. This takes the lead to smaller form factors with more consistent designs, less complex PCB layouts and decreased costs. The L6203 integrates or half-bridge and the PFC gate drivers. All operation parameters of the IC are variable by simple resistors, enabling cost effective but reliable and stable parameter-settings.
Features:
50 % duty cycle and variable frequency control
High-accuracy oscillator in use
Up to 500 kHz operating frequency is present
Two-level OCP: frequency-shift and latched shutdown in IC
Interface with PFC controller was a big note
Working:
When the resonant half-bridge is frivolously loaded or unloaded at all, its switching frequency will be at its highest value. To keep the output voltage under command in these conditions and to avoid losing soft switching, there must be some substantial residual current flowing through the transformer’s magnetizing inductance of integrated circuit. This current, however, produces some correlated losses that prevent converter’s no-load consumption from achieving very low values. To overcome this issue, the L6203 enables the designer to make the converter operate occasionally (burst-mode operation), with a series of a few switching cycles spaced out by long idle periods where both MOSFETs are in OFF-state, so that the regular switching frequency can be substantially reduced. As a result, the average value of the residual magnetizing current and the associated losses will be substantially cut down, thus facilitating the converter to comply with energy saving commendations.
Applications:
LCD and PDP TV
Desktop PC, entry-level server
Telecom SMPS
AC-DC adapter, open frame SMPS
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