UC3844 SMD SOP 8 Current Mode PWM Controller IC

UC3844 SMD SOP 8 Current Mode PWM Controller IC 

The UC3844 is a high-performance current-mode PWM controller designed for use in switch-mode power supplies (SMPS) and DC-DC converters. It integrates all the essential control and protection functions required for efficient power conversion while minimizing external component count.

Operating at a fixed frequency with current-mode control, the UC3844 provides fast transient response, improved stability, and inherent pulse-by-pulse current limiting. The device includes an internal oscillator, error amplifier, current sense comparator, undervoltage lockout (UVLO), and a high-current totem-pole output stage capable of directly driving power MOSFETs.

The SOP-8 (SMD) package makes it ideal for compact, surface-mount power supply designs.

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Features

• Current-mode PWM control for improved stability and fast response
• Fixed-frequency operation
• Low start-up current
• Built-in undervoltage lockout (UVLO) with hysteresis
• Cycle-by-cycle current limiting
• High-gain error amplifier
• High-current totem-pole output for direct MOSFET drive
• Trimmed oscillator for accurate frequency control
• Maximum duty cycle limited to 50%
• Available in SOP-8 surface-mount package

Applications

• Switch-mode power supplies (SMPS)
• Offline and DC-DC power converters
• Flyback and forward converters
• Buck and boost converter designs
• Battery chargers
• Adapters and power bricks
• Industrial and consumer power electronics
• LED power drivers

Datasheet UC series