The UC1846-EP control IC provides all of the necessary features to implement fixed-frequency, current-mode control schemes, while maintaining a minimum external parts count. The superior performance of this technique can be measured in improved line regulation, enhanced load-response characteristics, and a simpler, easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current-limiting capability, automatic symmetry correction for push-pull converters, and the ability to parallel power modules, while maintaining equal current sharing.
Protection circuitry includes built-in undervoltage lockout and programmable current limit, in addition to soft-start capability. A shutdown function is also available, which can initiate either a complete shutdown with automatic restart or latch the supply off.
Other features include fully latched operation, double pulse suppression, deadline adjust capability, and a ±1% trimmed bandgap reference.
The UC1846-EP features low outputs in the OFF state.
(1)Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified
performance and environmental limits.
| Topology | Boost, Flyback, Forward, Full bridge, Half bridge, Push pull |
| Control mode | Current |
| Duty cycle (max) (%) | 50 |
| Switching frequency (max) (kHz) | 500 |
| Features | Error amplifier, Multi-topology, Soft start, Synchronization pin |
| UVLO thresholds on/off (V) | 7.7/6.95 |
| Operating temperature range (°C) | -55 to 125 |
| Rating | HiRel Enhanced Product |
| Gate drive (typ) (A) | 0.5 |
| Vin (max) (V) | 40 |
| SOIC (DW) | 16 | 106.09 mm² 10.3 x 10.3 |
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