UC1825-DIE
www.ti.com SLUSBO1 – JULY 2013 RAD-TOLERANT, HIGH-SPEED PWM CONTROLLER
Check for Samples: UC1825-DIE FEATURES 1 (1) Rad-Tolerant: 30 kRad (Si) TID (1)
Compatible With Voltage-or Current-Mode
Topologies
Practical Operation Switching Frequencies
50-ns Propagation Delay-to-Output
High-Current Dual Totem Pole Outputs
Radiation tolerance is a typical value based upon initial device
qualification with dose rate = 10 mrad/sec. Radiation Lot
Acceptance Testing is available -contact factory for details. 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 DESCRIPTION
The UC1825-DIE PWM control device is optimized for high-frequency switched mode power supply applications.
Particular care was given to minimizing propagation delays through the comparators and logic circuitry while
maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either currentmode or voltage mode systems with the capability for input voltage feed-forward.
Protection circuitry includes a current limit comparator with a 1-V threshold, a TTL compatible shutdown port, and
a soft start pin which will double as a maximum duty-cycle clamp. The logic is fully latched to provide jitter-free
operation and prohibit multiple pulses at an output. An undervoltage lockout section with 800 mV of hysteresis …