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FSQ0370RNA Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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FSQ0370RNA Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 18 page © 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FSQ0370RNA / FSQ0370RLA • Rev. 1.0.2 3 Pin Assignments Figure 3. Pin Configuration (Top View) Pin Definitions Pin# Name Description 1 GND SenseFET source terminal on the primary side and internal control ground. 2 Vcc 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 Figure 2). It is not until VCC reaches the UVLO upper threshold (12V) that the internal startup switch opens and device power is supplied via the auxiliary transformer winding. 3 Vfb 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. A feedback voltage of 6V triggers overload protection (OLP). There is a delay while charging external capacitor Cfb from 3V to 6V using an internal 5µA current source. This delay prevents false triggering under transient conditions, but allows the protection mechanism to operate in true overload conditions. 4 Ipk This pin adjusts the peak current limit of the SenseFET. The 0.9mA feedback current source is diverted to the parallel combination of an internal 2.8k Ω resistor and any external resistor to GND on this pin. This determines the peak current limit. If this pin is tied to Vcc or left floating, the typical peak current limit is 1.1A. 5 Vstr This pin is connected to the rectified AC line voltage source. At startup, the internal switch supplies internal bias and charges an external storage capacitor placed between the Vcc pin and ground. Once 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 decreases leakage inductance. |
Similar Part No. - FSQ0370RNA_12 |
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Similar Description - FSQ0370RNA_12 |
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