UCC1810, UCC2810, and UCC3810 are high-speed BiCMOS integrated circuits for use in off-line and DC-to-DC power supplies. They provide two synchronized pulse width modulators using the same oscillator for perfect synchronization. These products incorporate many of the same elements as the UC3842 current mode controller family, combined with the enhancements of the UCC3802, minimizing power supply parts count.
This document is a datasheet for the Unitrode UCC1810, UCC2810, and UCC3810 integrated circuits. These are high-speed BiCMOS devices that implement two synchronized pulse width modulators for use in off-line and DC-to-DC power supplies. The chips feature a single oscillator to synchronize two PWMs up to 1MHz, internal soft start, and full-cycle fault restart capabilities.
| Oscillator Frequency (RT=150k, CT=120pF) | 200 to 240 kHz |
|---|---|
| Reference Output Voltage | 5.000 V |
| Operating Supply Current | 2.0 to 3.0 mA |
| Startup Supply Current | 150pA |
| Maximum Duty Cycle (RT=150k) | 50 % |
| OUT Rise Time (Cout=1nF) | 20 to 50 ns |
| OUT Fall Time (Cout=1nF) | 30 to 60 ns |
The single oscillator synchronizes two PWMs with operation up to 1MHz.
The typical response from current sense to output is 75ns.
The voltage reference has a 1.5% tolerance.