This post explains for the Switching Regulator.
The Part Number is STRW6251D, STRW6251.
The function of this semiconductor is PWM Switching Regulator.
The package is TO-220 Type
Manufacturer: Allegro Microsystems
Preview images :STRW6251D
The STRW6251D series are current-mode PWM ICs that incorporate controller chips. These devices are manufactured using a proprietary high-voltage BCD process, and avalancheguaranteed MOSFETs. These elements allow power supply systems designs that are highly reliable and simple, with fewer
peripheral components. These ICs also provide Auto-Burst mode operation, which lowers input power requirements at light loads, and improves efficiency over the entire load range and universal-input range. […]
Features and Benefits :
1. Overcurrent protection (OCP) with ac input voltage compensation function; no additional peripheral circuits required-minimizes dependency of OCP on ac input
2. Overload protection (OLP) with integrated timer reduces power stress (temperature rise) at overload condition, requires no peripheral components
Applicatons include :
1. TV set top box
2. LCD PC monitor, LCD TV
3. Printer, scanner