The UC1826 UC2826 UC3826 is a secondary side average current mode controller for isolated power supplies, with a 1MHz operation frequency, excellent anti-noise, good transient response and accurate maximum duty cycle programmable function.
The UC1826 family of average current mode controllers accurately accomplishes secondary side average current mode control. The secondary side output voltage is regulated by sensing the output voltage and differentially sensing the AC switching current. The sensed output voltage drives a voltage error amplifier, while the AC switching current, monitored by a current sense resistor, drives a high bandwidth, low offset current error amplifier.
The UC1826 features load share, oscillator synchronization, undervoltage lockout, and programmable output control. Multiple chip operation can be achieved by connecting up to ten UC1826 chips in parallel. With its tailored bandwidth, the UC1826 provides excellent noise immunity and is an ideal controller to achieve high power, secondary side average current mode control.
| Operating Frequency | 1MHz |
|---|---|
| Gain Bandwidth Product | 70MHz |
| Max Duty Cycle | 80% |
| Oscillator Frequency | 500 kHz |
Up to ten devices can easily share a common load.
The specifications apply for Ta = -55°C to +125°C for UC1826.
The turn-on threshold is 4.65V.