DC1850A is a 100V high voltage surge stopper for automotive applications. It operates in a floating topology, allowing the design of circuits capable of operating at virtually unlimited input voltage.
The DC1850A-A/DC1850A-B is a demonstration circuit for Linear Technology's LTC4366 high voltage surge stopper, designed for 28V vehicle applications. It withstands input voltages up to 100VDC and input transients up to 250V while maintaining a 43.1V output. The board includes protection against reverse battery and errant inputs up to -100VDC. The DC1850A-A features latchoff behavior after a fault, reset by asserting SHUTDOWN high for at least 100µs. The DC1850A-B features auto-retry 9 seconds after tripping off in an overvoltage fault condition, with the delay interruptible by pulsing SHUTDOWN.
The board layout provides 87mil clearance between input and output to prevent arcing. It includes ancillary circuits for shutdown level shifting, constant current LED driver, and reverse voltage protection. Operation is straightforward: connect an input supply of 18V to 41V and an output load of up to 1.5A. The SHUTDOWN turret defaults to ON if left open, and pulling it to 1.8V or higher causes shutdown. This manual is written in Chinese.
| Input Range | 18V to 100VDC |
|---|---|
| Output Voltage | 43.1V |
| Input Transient Withstand | 250V |
| Reverse Voltage Protection | ±100VDC |
| Shutdown Reset Time (DC1850A-A) | 100µs |
| Auto-Retry Delay (DC1850A-B) | 9 seconds |
The DC1850A can handle input voltages up to 100VDC.
The DC1850A-B features auto-retry 9 seconds after tripping off in an overvoltage fault condition, with the delay interruptible by pulsing SHUTDOWN.
The output voltage is maintained at 43.1V.