STR-X6757

Features and Benefits

● Quasi-resonant topology IC   □ Low EMI noise and soft switching

● Bottom-skip mode   □ Improved system eficiency over the eatite output load by aviding increase of swiching frequency

● Auto-Standby mode   □ Lowers input power at very light output 1oad condition

● Alache-garanteed MOSEET口Improves system-level reliability and does not require VDSS derating

● 650 VDSS /0.62 2 RDS(on)

● Various protetions   □ Improved stem.level rliabilityy

   Pulse-by-pulse drain orecrreret limiting

   Oeroltre Poetio (bias winding voltre seasing, with 1atch

   Overload Protection with latch

   Maximum on-time limit

Package: 7-Pin TO-3P

Description

The STR-X6757 is a quasi-resonant topology IC designed for SMPS applications. It shows lower EMI noise characteristics than conventional PWM solutions, especially at greater than 2 MHz. It a1so provides a soft-switching mode to turn on the internal MOSFET at close to zero voltage (VDS bottom point) by use of the resonant characteristic of primary inductance and a resonant capacitor.

The package is a fully molded TO-3P: which contains the controller chip (MIC) and MOSFET, enabling output power up to 320 W at 230 VAC and 165 W at universal input. The bottom-skip mode skips the first bottom of VDS and turns on the MOSFET at the second bottom point, to minimize an increase of operating frequency at 1ight output 1oad, improving system 1eve1 efficiency over the entire load range.

Therearetwostandbymodesavailabletoreducetheinputpower under very light load conditions. The first is Auto-Standby mode. which is internally triggered by periodic sensing. and the other is a manual standby mode, which is executed by clamping the secondary output. In general applications, the manualstandbymodereducestheinputpowerfurthercompared to Auto-Standby mode.

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