Hot-selling and scarce UC1825J High Speed PWM Controller IC CDIP spot stock

Product Descriptions

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.

Product Features

•     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)

Product Photos

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