[Tsinghua Tongfang Optical Disc Co., Ltd.]

Overview
To further simplify the offline switching power supply (SMPS) Designed to make it compact and lightweight, Samsung launched A new device called SPS. The so-called SPS, that is, three Star Power Switch (English) Abbreviations can also be thought of as smart power switches (Smart Abbreviation for Power Switch). SPS is equipped with electricity Flow-type PWM control IC and with current sensing MOSFET (called Sense FET, SFET for short) Two-in-one chip, as shown in Figure 1.

In order to ensure its insulation properties, the core The sheet and inner leads are not epoxy but BCB Material coating. SPS mainly uses TO2220 four legs and TO23P, TO23PL five-pin package, as shown in Figure 2. Each pin symbol The functions of the number are : DRA IN is the drain of SF ET , GND is ground, VCC is power supply voltage, FB is feedback, Soft Start (S · S) is soft start.

SPS adopts current-mode PWM control mode.
Overload protection and overheat protection and other functions. SPS will check the high pressure.
The measurement function was introduced into MOSF ET, in practical application No need for external current sense resistors.
SPS Series Power from 20W up to 200W in VCR, Color Electricity, monitors, personal computers, fax machines, cell phones, and chargers Electrical appliances and other products have a wide range of applications.