Product details

Topology Boost, Flyback, Forward, Half-Bridge, Push-Pull Duty cycle (Max) (%) 85 Supply voltage (Max) (V) 12 UVLO thresholds on/off (V) 9.2/8.4 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Multi-topology, Programmable Max Duty Cycle, Soft Start, Synchronization Pin Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 1.5
Topology Boost, Flyback, Forward, Half-Bridge, Push-Pull Duty cycle (Max) (%) 85 Supply voltage (Max) (V) 12 UVLO thresholds on/off (V) 9.2/8.4 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Multi-topology, Programmable Max Duty Cycle, Soft Start, Synchronization Pin Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 1.5
PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 10.3 x 7.5
  • Compatible with Voltage or Current Mode Topologies
  • Practical Operation Switching Frequencies to 1MHz
  • 50ns Propagation Delay to Output
  • High Current Dual Totem Pole Outputs (1.5A Peak)
  • Wide Bandwidth Error Amplifier
  • Fully Latched Logic with Double Pulse Suppression
  • Pulse-by-Pulse Current Limiting
  • Soft Start / Max. Duty Cycle Control
  • Under-Voltage Lockout with Hysteresis
  • Low Start Up Current (1.1mA)
  • Compatible with Voltage or Current Mode Topologies
  • Practical Operation Switching Frequencies to 1MHz
  • 50ns Propagation Delay to Output
  • High Current Dual Totem Pole Outputs (1.5A Peak)
  • Wide Bandwidth Error Amplifier
  • Fully Latched Logic with Double Pulse Suppression
  • Pulse-by-Pulse Current Limiting
  • Soft Start / Max. Duty Cycle Control
  • Under-Voltage Lockout with Hysteresis
  • Low Start Up Current (1.1mA)

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.

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Technical documentation

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Type Title Date
* Data sheet High Speed PWM Controller datasheet (Rev. A) 24 Feb 2004
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Current Doubler Rectifier Offers Ripple Current Cancellation 21 Sep 2004
Application note U-110 1.5 Mhz Current Mode IC Controlled 50-Watt Power Supply 05 Sep 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

UC1825 TINA-TI Transient Reference Design

SLUM653.TSC (5219 KB) - TINA-TI Reference Design
Simulation model

UC1825 TINA-TI Transient Spice Model

SLUM654.ZIP (6 KB) - TINA-TI Spice Model
Package Pins Download
PDIP (N) 16 View options
SOIC (DW) 16 View options

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