Unitrode UC2825A
the UC2823A,B and UC2825A,B; 0°C to +70°C for the UC3823A,B and UC3825A,B; RT = 3.65k, CT = 1nF, VCC = 12V, TA = TJ.| Part No. | UC2825A |
|---|---|
| Datasheet | UC2825A Download |
| Manufacturer |  Unitrode |
| Description | High Speed PWM Controller |
| Buy | Stock & Price |
FEATURES
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● Improved versions of the UC3823/UC3825 PWMs Compatible with Voltage or Current-Mode Topologies Practical Operation at Switching Frequencies to 1MHz 50ns Propagation Delay to Output High Current Dual Totem Pole Outputs (2A Peak) Trimmed Oscillator Discharge Current Low 100µA Startup Current Pulse-by-Pulse Current Limiting Comparator Latched Overcurrent Comparator With Full Cycle Restart
DESCRIPTION
The UC3823A & B and the UC3825A & B family of PWM control ICs are improved versions of the standard UC3823 & UC3825 family. Performance enhancements have been made to several of the circuit blocks. Error amplifier gain bandwidth product is 12MHz while input offset voltage is 2mV. Current limit threshold is guaranteed to a tolerance of 5%. Oscillator discharge current is specified at 10mA for accurate dead time control. Frequency accuracy is improved to 6%. Startup supply current, typically 100µA, is ideal for off-line applications. The output drivers are redesigned to actively sink current during UVLO at no expense to the startup current specification.
