The CS51227 is a fixed frequency, single output PWM controller using feed forward voltage mode control. Feed forward control provides superior line regulation and line transient response. This PWM controller has been optimized for high frequency primary side control operation. It has undervoltage lockout with 4.7 V start up voltage and 75 µA start up current. One external capacitor can program the switching frequency up to 1.0 MHz. The protection features include pulse–by–pulse current limit with leading edge blanking and thermal shutdown. The CS51227 is available in 8 lead SO narrow surface mount package.
The CS51227 is a fixed frequency, single output PWM controller using feed forward voltage mode control. It is optimized for high frequency primary side control operation and features undervoltage lockout with a 4.7 V start-up voltage and 75 mA start-up current. The device includes protection features such as pulse-by-pulse current limit with leading edge blanking and thermal shutdown.
| Storage Temperature Range | -65 to +150 °C |
|---|---|
| Start-Up Voltage | 4.7 V |
| Maximum Switching Frequency | 1.0 MHz |
| Maximum Duty Cycle | Over 85% |
| Gate Drive Sink/Source | 1.0 A |
| Package Type | SO-8 |
The device has an undervoltage lockout with a 4.7 V start-up voltage.
Yes, the protection features include thermal shutdown.
The switching frequency can be programmed up to 1.0 MHz using one external capacitor.