UC3846N PWM Controller IC by HLF | DIP Package

The UC3846N from HLF belongs to the UC1846/7 family of current-mode control ICs, offering all the essential features to implement fixed-frequency, current-mode control schemes with minimal external components. This results in superior performance with improved line regulation, enhanced load response, and a simpler control loop design.

Key topological advantages include:

• Pulse-by-pulse current limiting

• Automatic symmetry correction for push-pull converters

• Parallel power module support with equal current sharing

The device integrates robust protection circuitry, including:

• Undervoltage lockout (UVLO)

• Programmable current limit

• Soft-start capability

• Shutdown function (configurable for auto-restart or latch-off)

Additional features include:

• Fully latched operation

• Double-pulse suppression

• Dead-time adjust capability

• 1% trimmed bandgap reference

The UC1846 variant provides low outputs in the OFF state, while the UC1847 variantHonglifa Electronics delivers high outputs in the OFF state.

Applications

• Switch-Mode Power Supplies (SMPS)

• Push-Pull & Half-Bridge Converters

• Industrial and Telecom Power Systems

• Parallel Power Module DesignsHLF