Texas Instruments UCC1809-1 2 UCC2809-1 2 UCC3809-1 2 Economy Primary Side Controller Data Manual
Summary
Optimize your power supplies with the UCC3809 family of low-power BCDMOS controllers. Designed for robust, fixed-frequency current mode switched power supplies (both off-line and isolated DC-to-DC), these circuits feature user-programmable soft start, maximum duty cycle control, and low startup currents. This manual provides comprehensive electrical data, connection diagrams, and detailed performance specifications necessary for engineers designing highly efficient and space-optimized conversion solutions.
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 18 |
| File Size | 523.80 KB |
| Published | July 16, 2026 |
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Frequently Asked Questions
What features does the UCC3809 family offer for DC-to-DC converters?
It offers cycle undervoltage lockout with a starting current less than 100µA, user programmable soft start, and maximum duty cycle control.
Is the device suitable for space-constrained applications?
Yes, it is available in small packages like TSSOP and MSOP, making it ideal where board height and space are limited.
What is the required minimum duty cycle to operate?
The output must have a minimum duty cycle greater than 2V to function effectively, reaching up to a maximum of 70%.
How can I program the oscillator frequency?
Frequency and maximum duty cycle are programmed using two resistors and a capacitor.