CURRENT MODE PWM+PFM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET
DESCRIPTION SD6835 is current mode PWM+PFM controller used for SMPS with built-in high-voltage MOSFET and external sense resistor. 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. Built-in limit output power compensation circuit to balance the limit output power under different AC voltage inputs. Built-in slope compensation circuit to adapt to more transformer applications. 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 and thermal shutdown. The circuit will restart until normal if protection occurs.
FEATURES
∗ Energy Star 2.0 standard
∗ Lower start-up current (4µA)
∗ Various switching frequency following load for the high efficiency
∗ EMI Frequency jitter for low EMI
∗ Overvoltage, overload and over temperature protections
∗ External peak current sense resistor
* Limit output power compensation
∗ Slope compensation
∗ 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
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