UCC28742DBVR
ActiveHIGH-EFFICIENCY FLYBACK CONTROLLER WITH 1% OUTPUT REGULATION ACCURACY
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UCC28742DBVR
ActiveHIGH-EFFICIENCY FLYBACK CONTROLLER WITH 1% OUTPUT REGULATION ACCURACY
Deep-Dive with AI
Technical Specifications
Parameters and characteristics for this part
| Specification | UCC28742DBVR |
|---|---|
| Duty Cycle | 99 % |
| Fault Protection | Short Circuit, Current Limiting, Over Voltage |
| Frequency - Switching | 80 kHz |
| Internal Switch(s) | False |
| Mounting Type | Surface Mount |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -40 °C |
| Output Isolation | Isolated |
| Package / Case | SOT-23-6 |
| Supplier Device Package | SOT-23-6 |
| Topology | Flyback |
| Voltage - Start Up | 21.6 V |
| Voltage - Supply (Vcc/Vdd) [Max] | 35 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 9 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 0.92 | |
| 10 | $ 0.81 | |||
| 25 | $ 0.76 | |||
| 100 | $ 0.62 | |||
| 250 | $ 0.57 | |||
| 500 | $ 0.49 | |||
| 1000 | $ 0.39 | |||
| Digi-Reel® | 1 | $ 0.92 | ||
| 10 | $ 0.81 | |||
| 25 | $ 0.76 | |||
| 100 | $ 0.62 | |||
| 250 | $ 0.57 | |||
| 500 | $ 0.49 | |||
| 1000 | $ 0.39 | |||
| Tape & Reel (TR) | 3000 | $ 0.35 | ||
| 6000 | $ 0.33 | |||
| 15000 | $ 0.32 | |||
| 30000 | $ 0.31 | |||
| Texas Instruments | LARGE T&R | 1 | $ 0.60 | |
| 100 | $ 0.46 | |||
| 250 | $ 0.34 | |||
| 1000 | $ 0.24 | |||
Description
General part information
UCC28742 Series
The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-side regulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flyback power-supply controller that provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. This device processes information from opto-coupled feedback and an auxiliary flyback winding for high-performance control of output voltage and current.
The UCC28742 employs advanced control algorithms to achieve high operating efficiency and performance. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.
The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitates the achievement of low no-load input power.
Documents
Technical documentation and resources