UC1825B-SP

www.ti.com UC1825B-SP SLUSDD5A – APRIL 2019 – REVISED DUECCE1M8B2E5RB2-S02P0 SLUSDD5A – APRIL 2019 – REVISED DECEMBER 2020 UC1825B-SP Class-V, Radiation Hardened High-Speed PWM Controller 1 Features QML-V qualified, SMD 5962-8768106 5962R8768106VYC: – Radiation hardness assurance (RHA) up to 100-krad(Si) total ionizing dose (TID) 1 Compatible with voltage- or current-mode topologies Practical operation switching frequencies to 1 MHz 50-ns propagation delay-to-output High-current dual totem pole outputs (2-A peak) Wide bandwidth error amplifier Fully latched logic with double-pulse suppression Pulse-by-pulse current limiting Soft start/maximum duty-cycle control Undervoltage lockout with hysteresis Low start-up current (1.1 mA) 2 Applications Radiation-hardened DC-DC converters Satellite buses and payloads Communications payload Optical imaging payload Radar imaging payload Space launch vehicles Supports various topologies: – Flyback, forward, buck, boost – Push-pull, half-bridge, full-bridge with external interface circuit CLOCK 4 RT 5 CT 6 RAMP 7 E/A Out 3 Error Amp NI 2 INV 1 1.25 V OSC Wide Bandwidth Error Amp. + − Inhibit PWM Latch (Set Dom.) R S VIN 9 µA Toggler F/F Soft Start 8 T ILIM CPRTR ILIM / SD 9 1V 1.4 V Shutdown CPRTR VCC 15 GND 10 9V UVLO VCC Good Gate REF Gen Internal Bias 4V Block Diagram 13 Vc 11 Out A 14 Out B 12 Pwr GND Output Inhibit VREF Good 16 VREF VDG−92032−2 3 Description The UC1825B...