FSQ0165RN(2007_05) Просмотр технического описания (PDF) - Fairchild Semiconductor

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FSQ0165RN
(Rev.:2007_05)

Green Mode Fairchild Power Switch (FPS™) for Valley Switching Converter - Low EMI and High Efficiency

Fairchild Semiconductor 

Pin Configuration

GND

D

Vcc

8-DIP

D

Vfb

8-VLSOP

D

Sync

Vstr

FSQ0365RN Rev.01

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin # Name

Description

1

GND SenseFET source terminal on primary side and internal control ground.

Positive supply voltage input. Although connected to an auxiliary transformer winding, current

2

Vcc

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.

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

3

Vfb externally. There is a time delay while charging external capacitor Cfb from 3V to 6V using an

internal 5μA current source. This time delay prevents false triggering under transient condi-

tions but still allows the protection mechanism to operate under true overload conditions.

This pin is internally connected to the sync-detect comparator for valley switching. Typically the

4

Sync

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.

This pin is connected to the rectified AC line voltage source. At start-up the internal switch sup-

5

Vstr 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.

© 2006 Fairchild Semiconductor Corporation

FSQ0365, FSQ0265, FSQ0165, FSQ321, FSQ311 Rev. 1.0.4

4

www.fairchildsemi.com

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