CS51221 is a fixed frequency, feed forward voltage mode PWM controller from Cherry Semiconductor Corporation that contains all of the features necessary for basic voltage mode operation. This PWM controller has been optimized for high frequency primary side control operation. In addition, this device includes features such as: Soft Start, accurate duty cycle limit control, less than 50µA startup current, over and under voltage protection, and bidirectional synchronization. The CS51221 is available in 16 lead PDIP and SO narrow surface mount packages.
The CS51221 is an enhanced voltage mode pulse width modulation (PWM) controller designed for basic voltage mode operation. It features a fixed frequency with feed-forward capability to improve line transient response and includes protection features such as soft start, accurate duty cycle limit control, and over/under voltage protection.
Available in 16-lead PDIP and SO narrow surface mount packages, the device supports bidirectional synchronization and offers a maximum operating frequency of 1 MHz. It provides a 3.3V reference voltage output and includes thermal shutdown with programmable hysteresis.
| Maximum Frequency | 1 MHz |
|---|---|
| Reference Voltage Output | 3.3V +/- 3% |
| Startup Current | < 50uA |
| Gate Drive Capability | 1.0A Peak |
| Thermal Shutdown Temperature | 125 to 180 C |
| Package Options | 16 Lead PDIP & SO Narrow |
The device includes less than 50uA startup current.
Yes, it includes bidirectional synchronization features.
The device has a 1MHz Frequency Capability.