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FSQ0365 Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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FSQ0365 Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 24 page © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev. 1.0.4 4 Pin Configuration Figure 3. Pin Configuration (Top View) Pin Definitions Pin # Name Description 1 GND SenseFET source terminal on primary side and internal control ground. 2Vcc Positive supply voltage input. Although connected to an auxiliary transformer winding, current is supplied from pin 5 (Vstr) via an internal switch during startup (see Internal Block Diagram Section). It is not until VCC reaches the UVLO upper threshold (12V) that the internal start-up switch opens and device power is supplied via the auxiliary transformer winding. 3Vfb The feedback voltage pin is the non-inverting input to the PWM comparator. It has a 0.9mA current source connected internally while a capacitor and optocoupler are typically connected externally. There is a time delay while charging external capacitor Cfb from 3V to 6V using an internal 5 μA current source. This time delay prevents false triggering under transient condi- tions but still allows the protection mechanism to operate under true overload conditions. 4 Sync This pin is internally connected to the sync-detect comparator for valley switching. Typically the voltage of the auxiliary winding is used as Sync input voltage and external resistors and capac- itor are needed to make time delay to match valley point. The threshold of the internal sync comparator is 0.7V/0.2V. 5Vstr This pin is connected to the rectified AC line voltage source. At start-up the internal switch sup- plies internal bias and charges an external storage capacitor placed between the Vcc pin and ground. Once the Vcc reaches 12V, the internal switch is opened. 6,7,8 Drain The drain pins are designed to connect directly to the primary lead of the transformer and are capable of switching a maximum of 700V. Minimizing the length of the trace connecting these pins to the transformer will decrease leakage inductance. GND Vcc Sync Vstr 8-DIP Vfb D D D FSQ0365RN Rev.01 8-LSOP V |
Similar Part No. - FSQ0365_07 |
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Similar Description - FSQ0365_07 |
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