The OB2268CP is a highly integrated current mode PWM control IC on Whatsminer P222B power supplies, optimized for high performance, low standby power consumption, and cost-effective offline flyback converter applications above 20W power class.

VDD's low start-up current and low operating current help to use OB2268CP for reliable start-up design. Therefore, large-value resistors can be used in the start-up circuit to minimize standby power consumption. In addition, internal slope compensation improves system large-signal stability and reduces sub-harmonic oscillations at high PWM duty cycle outputs.

OB2268CP provides a complete protection range and automatic self-recovery functions, including cycle-by-cycle current limit (OCP), overload protection (OLP), over-temperature protection (OTP), VDD over-voltage protection (OVP) and under-voltage lockout (UVLO). In addition, the gate drive output is clamped to a maximum of 18V to protect the power MOSFETs.

Feature:

• Extended burst mode control for improved efficiency and minimal standby power design

• Audio noise-free operation

• Externally programmable PWM switching frequency

• Internally synchronized slope compensation

• Low VIN/VDD startup current (4uA) and low operating current (2.3mA)

• Current sense input leading edge blanking

• Full protection coverage with automatic self-healing

Application:

• Laptop power adapter

• PC/TV/STB power supply

• Open switching power supply

• Battery charger

• Whatsminer P222B power supply