What the 46 µA startup current means for the BOM
A 46 µA startup draw is low enough that the controller can charge its VDD cap from the rectified line through a high-value resistor without wasting power in a bleeder.
UCC28056BDBVT Transition-Mode PFC Controller, SOT-23-6
MPNUCC28056BDBVT
End of Life
Texas Instruments UCC28056BDBVT transition-mode PFC controller, SOT-23-6, 8.5V–34V supply, 46 µA startup current, -40°C to 125°C operating temperature.
$1.01Ref. price · indicative, final on quote
PackagingSOT-23-6
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Mounting | Surface Mount |
| Supply voltage | 8.5V ~ 34V |
| Current - startup | 46 µA |
| Operating temperature | -40°C ~ 125°C (TA) |
| Mode | Discontinuous (Transition) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Case | SOT-23-6 |
Product details
Frequently asked questions
What is the operating mode of UCC28056BDBVT?
It operates in discontinuous (transition) mode — also called critical-conduction mode. This mode gives natural zero-current switching of the boost diode, reducing reverse-recovery losses and EMI, at the cost of higher peak currents than continuous-conduction designs.