UCC28740DR
ActiveCONSTANT-VOLTAGE, CONSTANT-CURRENT (CVCC) FLYBACK CONTROLLER WITH SECONDARY SIDE REGULATION (SSR)
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UCC28740DR
ActiveCONSTANT-VOLTAGE, CONSTANT-CURRENT (CVCC) FLYBACK CONTROLLER WITH SECONDARY SIDE REGULATION (SSR)
Technical Specifications
Parameters and characteristics for this part
| Specification | UCC28740DR |
|---|---|
| Fault Protection | Over Voltage, Current Limiting |
| Frequency - Switching [Max] | 100 kHz |
| Frequency - Switching [Min] | 170 Hz |
| Internal Switch(s) | False |
| Mounting Type | Surface Mount |
| Operating Temperature [Max] | 125 ¯C |
| Operating Temperature [Min] | -40 °C |
| Output Isolation | Isolated |
| Package / Case | 8-SOIC |
| Package / Case | 0.154 in |
| Package / Case [custom] | 7 |
| Package / Case [custom] | 3.9 mm |
| Supplier Device Package | 7-SOIC |
| Topology | Flyback |
| Voltage - Start Up | 21 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 | $ 1.26 | |
| 10 | $ 1.12 | |||
| 25 | $ 1.07 | |||
| 100 | $ 0.88 | |||
| 250 | $ 0.82 | |||
| 500 | $ 0.72 | |||
| 1000 | $ 0.57 | |||
| Digi-Reel® | 1 | $ 1.26 | ||
| 10 | $ 1.12 | |||
| 25 | $ 1.07 | |||
| 100 | $ 0.88 | |||
| 250 | $ 0.82 | |||
| 500 | $ 0.72 | |||
| 1000 | $ 0.57 | |||
| Tape & Reel (TR) | 2500 | $ 0.53 | ||
| 5000 | $ 0.51 | |||
| 12500 | $ 0.49 | |||
| Texas Instruments | LARGE T&R | 1 | $ 0.93 | |
| 100 | $ 0.72 | |||
| 250 | $ 0.53 | |||
| 1000 | $ 0.38 | |||
Description
General part information
UCC28740 Series
The UCC28740 isolated-flyback power-supply controller provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. Constant-Current (CC) regulation is accomplished through Primary-Side Regulation (PSR) techniques. This device processes information from opto-coupled feedback and an auxiliary flyback winding for precise high-performance control of output voltage and current.
An internal 700-V startup switch, dynamically controlled operating states, and a tailored modulation profile support ultra-low standby power without sacrificing startup time or output transient response.
Control algorithms in the UCC28740 allow operating efficiencies to meet or exceed applicable standards. 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.
Documents
Technical documentation and resources