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FSDH321L Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FSDH321L Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 20 page FSDH321, FSDL321 3 Pin Definitions Pin Configuration Figure 3. Pin Configuration (Top View) Pin Number Pin Name Pin Function Description 1 GND Sense FET source terminal on primary side and internal control ground. 2Vcc Positive supply voltage input. Although connected to an auxiliary transform- er 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 de- vice 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 op- tocoupler are typically connected externally. A feedback voltage of 6V trig- gers over load protection (OLP). There is a time delay while charging external capacitor Cfb from 3V to 6V using an internal 5uA current source. This time delay prevents false triggering under transient conditions, but still allows the protection mechanism to operate under true overload conditions. 4Ipk This pin adjusts the peak current limit of the Sense FET. The feedback 0.9mA current source is diverted to the parallel combination of an internal 2.8k Ω resistor and any external resistor to GND on this pin to determine the peak current limit. If this pin is tied to Vcc or left floating, the typical peak cur- rent limit will be 0.7A. 5Vstr This pin connects directly to the rectified AC line voltage source. At start up the internal switch supplies 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 650V. Minimizing the length of the trace connecting these pins to the transformer will decrease leakage inductance. 1 2 3 45 6 7 8 GND Vcc Vfb Ipk Vstr Drain Drain Drain 8DIP 8LSOP |
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