Description

1 Features 1• Optimized for Off-Line and DC-DC Converters • Low Start-Up Current (< 0.5 mA) • Trimmed Oscillator Discharge Current • Automatic Feedforward Compensation • Pulse-by-Pulse Current Limiting • Enhanced Load Response Characteristics • Undervoltage Lockout With Hysteresis • Double Pulse Suppression • High-Current Totem Pole Output • Internally-Trimmed Bandgap Reference • Up to 500-kHz Operation • Create a Custom Design Using the UCx84xA 2 Applications • Switch Mode Power Supplies (SMPS) • DC-DC Converters • Power Modules • Industrial PSU • Battery Operated PSU 3 Description The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control currentmode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.