Part Number : HY3843
Function : Fixed Frequency Current Mode PWM Controller.
Package : SOP 8 Pin Type
Maker : Hooyi Semicondcutor ( www.hooyi-semi.com )
Pinouts : 
Description :
The HY3843 / HY3842D-N / HY3843D-N / HY3844D-N / HY3845D-N, are fixed frequency current mode PWM controller. Theyare speciallydesigned for OFF−Line and DC to DC converter applications with a minimal externalcomponents. Internallyimplemented circuits include a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET. Protection circuitry includes built under voltage lockout and current limiting.
http://www.hooyi-semi.com
Features
• Low Start-Up and Operating Current
• High Current Totem Pole Output
• Under voltage Lockout With Hysteresis
• Operating Frequency Up To 500KHz
Datasheet PDF Download : 
Others datasheet of same file :
3843D-N, 3844D-N, 3845D-N, HY3842, HY3842D-N
