UTC UC3800BG PWM Controller IC The UTC UC3800BG is a current-mode PWM controller IC manufactured by Unisonic Technologies (UTC). It is designed primarily for offline flyback SMPS power supplies with low standby power consumption. Key Features • Current-mode PWM control • Fixed switching frequency: 65 kHz • Integrated high-voltage startup • Low standby power (Green Mode) • Built-in soft start • Cycle-by-cycle current limiting • Under-Voltage Lockout (UVLO) • Over-Voltage Protection (OVP) • Over-Temperature Protection (OTP) • Overload Protection (OLP) • Frequency hopping for improved EMI performance • Maximum duty cycle: 78% (typical) Package • SOP-8 (SOIC-8) Typical Applications • AC-DC Power Adapters • Mobile Chargers • LED Drivers • Flyback SMPS • Set-Top Box Power Supplies • Printer Power Supplies • Open-frame Power Supplies