DESCRIPTION
SD6834 is current mode PWM+PFM controller with built-in high-voltage
MOSFET used for SMPS.
It features low standby power and low start current. In standby mode, the
circuit enters burst mode to reduce the standby power dissipation.
The switch frequency is 25~67KHz decided by the load with jitter
frequency for low EMI.
Built-in peak current compensation circuit makes the limit peak current
stable even with different input AC voltage. Maximum peak current
compensation during power-on reduces pressure on transformer to avoid
saturation, the peak current compensation will decrease for balance after
power-on. Limit output current can be adjusted through the resistor
connected to CS.
It integrates various protections such as undervoltage lockout, overvoltage
protection, overload protection, leading edge blanking, primary winding
overcurrent protection and thermal shutdown. The circuit will restart until
normal if protection occurs.

FEATURES
 Energy Star 2.0 standard
 Lower start-up current (3μA)
 Various switching frequency following load for the high efficiency
 EMI Frequency jitter for low EMI
 Overvoltage, primary winding overcurrent, overload and over
temperature protections
 External peak current sense resistor
 Undervoltage lockout
 Built-in high voltage MOSFET
 Auto restart mode
 Peak current compensation Maximum peak current
compensation for initialization to realize the soft start function.
 Burst mode
 Cycle by cycle current limit