UC3845BN PWM Controller IC, 500 kHz, Current-Mode, 8-Pin PDIP, High-Speed Switch Mode

The UC3845BN is a high-performance current-mode Pulse Width Modulation (PWM) controller IC designed for switch-mode power supplies (SMPS). Optimized for off-line and DC-DC converter applications, it operates at high frequency—up to 500 kHz—offering fast switching capabilities and superior power efficiency. The IC features an accurate undervoltage lockout (UVLO), a trimmed oscillator for precise duty cycle control, and a totem-pole output stage for fast switching with minimal delay. Encased in an 8-pin PDIP (Plastic Dual In-line Package), the UC3845BN is widely used in flyback, boost, and forward converters, providing robust current-mode control for demanding designs. Its high-speed switching and integrated current sense capabilities make it ideal for compact and efficient power designs.

Key Features:

• Operating frequency up to 500 kHz for high-speed power conversion
• Current-mode control for improved transient response and line regulation
• UVLO with hysteresis for reliable startup and shutdown
• Trimmed oscillator for precise frequency control
• Totem-pole output with ±1A peak drive current
• Low startup and operating current for energy-efficient designs