UC1825A-DIE Series

Space-grade, 30-V input, 1.5-A dual-output 1-MHz PWM controller in DIE

Catalog

Space-grade, 30-V input, 1.5-A dual-output 1-MHz PWM controller in DIE

Part	Supplier Device Package	Control Features	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Configuration	Synchronous Rectifier	Frequency - Switching [Max]	Frequency - Switching [Min]	Clock Sync	Duty Cycle (Max) [Max]	Package / Case	Topology	Number of Outputs	Mounting Type	Output Phases	Function	Output Type
Texas Instruments UC1825AVTD2	Die	Current Limit Frequency Control Ramp Soft Start	8.4 V	22 V	Positive		1 MHz	400 kHz		50 %	Die	Boost Flyback Forward Converter Full-Bridge Half-Bridge Push-Pull	2	Surface Mount	1	Step-Up Step-Up/Step-Down	Transistor Driver
Texas Instruments UC1825VTD2	Die	Current Limit Frequency Control Ramp Soft Start	8.4 V	22 V	Positive		1 MHz	400 kHz		50 %	Die	Boost Flyback Forward Converter Full-Bridge Half-Bridge Push-Pull	2		1	Step-Up Step-Up/Step-Down	Transistor Driver

Catalog

Space-grade, 30-V input, 1.5-A dual-output 1-MHz PWM controller in DIE

Key Features

• Rad-Tolerant: 30 kRad (Si) TID(1)Compatible With Voltage- or Current-Mode TopologiesPractical Operation Switching Frequencies50-ns Propagation Delay-to-OutputHigh-Current Dual Totem Pole OutputsWide Bandwidth Error AmplifierFully Latched Logic With Double-Pulse SuppressionPulse-by-Pulse Current LimitingSoft Start/Maximum Duty-Cycle ControlUndervoltage Lockout With HysteresisLow Start-Up Current(1)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.Rad-Tolerant: 30 kRad (Si) TID(1)Compatible With Voltage- or Current-Mode TopologiesPractical Operation Switching Frequencies50-ns Propagation Delay-to-OutputHigh-Current Dual Totem Pole OutputsWide Bandwidth Error AmplifierFully Latched Logic With Double-Pulse SuppressionPulse-by-Pulse Current LimitingSoft Start/Maximum Duty-Cycle ControlUndervoltage Lockout With HysteresisLow Start-Up Current(1)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.

Description

The UC1825 family of PWM control ICs 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 current-mode or voltage mode systems with the capability for input voltage feed-forward. Protection circuitry includes a current limit comparator with a 1V 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 under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the outputs are high impedance. These devices feature totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is designed as a high level. The UC1825 family of PWM control ICs 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 current-mode or voltage mode systems with the capability for input voltage feed-forward. Protection circuitry includes a current limit comparator with a 1V 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 under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the outputs are high impedance. These devices feature totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is designed as a high level.