CS3843AGDR8

DC DC Switching Controllers Overview

The CS3843AGDR8 is an off-line current mode PWM controller manufactured by onsemi. It operates with a maximum switching frequency of 500 kHz and features a SOIC-8 surface-mount package. The device supports a nominal input voltage of 15 V, with a minimum operating voltage of 8.2 V and a maximum limit of 25 V. It provides a peak output drive current of 1 A and includes built-in undervoltage lockout for reliable startup and shutdown protection.

DC DC Switching Controllers Feature Summary

• Implements current-mode pulse width modulation control architecture
• Integrates undervoltage lockout circuitry for power supply protection
• Designed specifically for off-line power conversion applications

DC DC Switching Controllers Applications

• Off-line flyback converters
• General-purpose DC-DC switching power supplies
• Battery charger circuits

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'A' in the part number CS3843AGDR8 against official datasheets to confirm lead-free status and RoHS compliance, as historical data indicates potential variations. Ensure the SOIC-8 package dimensions match the target PCB footprint. Confirm that the 500 kHz switching frequency aligns with the magnetic component design requirements for the intended application.

DC DC Switching Controllers Selection Notes

Select this component for designs requiring robust off-line control with integrated undervoltage lockout. The 1 A output drive capability suits direct gate driving of medium-power MOSFETs. Consider the 8.2 V to 25 V input range when designing the bias winding or startup resistor network. The current-mode control offers inherent line feedforward and simplified compensation compared to voltage-mode alternatives.

DC DC Switching Controllers Part Context

This part belongs to the UC384x family of current-mode PWM controllers, widely used in offline power supplies. The CS3843 variant is a commercial-grade version of the industry-standard UC3843. It shares functional compatibility with other members of the series but may differ in temperature ranges or manufacturing origins. The 'GDR8' suffix typically denotes tape-and-reel packaging in an SOIC-8 form factor.

DC DC Switching Controllers Replacement Considerations

Direct pin-compatible substitutes include the UC3843BD1G and CS3844BGDR8 from onsemi. Verify that the replacement maintains the same 500 kHz frequency and 1 A drive current. Check if the alternative part meets the specific RoHS compliance requirements of the original CS3843AGDR8.