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STR-W6750

Part Number	STR-W6750
Manufacturer	Allegro MicroSystems
Description	Off-Line Quasi-Resonant Switching Regulators
Published	Jul 14, 2011
Detailed Description	g n i h tors c t i a Sw egul R Application Note 28103.30 PRODUCT DESCRIPTION www.DataSheet4U.net Series STR-W6750 Of...
Datasheet	STR-W6750 PDF File

Overview

g n i h tors c t i a Sw egul R Application Note 28103.
30 PRODUCT DESCRIPTION www.
DataSheet4U.
net Series STR-W6750 Off-Line Quasi-Resonant Switching Regulators INTRODUCTION TERMINAL FUNCTIONS VCC (Pin 4) Start-up circuit The start-up circuit detects the VCC pin voltage (pin 4), and makes the control IC start and stop operation.
The power supply of the control IC (VCC pin input) employs a circuit as shown in Figure 1.
At start-up, C3 is charged through a startup resistor R2.
The R2 value needs to be set for more than the hold current of the latch circuit (140 µA max.
) and to operate at the minimum ac input.
The Series STR-W6750 devices are hybrid integrated circuits (HICs) with a built-in power MOSFET and a control IC designed for quasi-resonant type switch-mode power supplies (SMPS).
In normal operation, the HIC provides high efficiency and low EMI noise with bottom-skip quasi-resonant operation during light output loads.
Low power consumption is also achieved by blocking (intermit...

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