UCC28722 Series
Low-Cost CVCC Flyback controller With primary-side regulation for bipolar Power Device
Manufacturer: Texas Instruments
Catalog(1 parts)
| Part | Operating Temperature▲▼ | Operating Temperature▲▼ | Internal Switch(s)▲▼ | Topology | Frequency - Switching▲▼ | Frequency - Switching▲▼ | Voltage - Start Up▲▼ | Output Isolation | Fault Protection | Mounting Type | Supplier Device Package | Package / Case | Voltage - Supply (Vcc/Vdd)▲▼ | Voltage - Supply (Vcc/Vdd)▲▼ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
125 °C | -40 °C | Flyback | 80000 Hz | 650 Hz | 21 V | Isolated | Current Limiting, Over Voltage | Surface Mount | SOT-23-6 | SOT-23-6 | 35 V | 9 V |
Key Features
• < 50-mW No-Load PowerPrimary-Side Regulation (PSR) Eliminates Opto-CouplerDynamic BJT Drive± 5% Voltage and Current Regulation Across Lineand Load80-kHz Maximum Switching Frequency EnablesHigh-Power Density Charger DesignsQuasi-Resonant Valley-Switching Operation forHighest Overall EfficiencyWide VDD Range Allows Small Bias CapacitorOutput Overvoltage, Low-Line, and OvercurrentProtection FunctionsProgrammable Cable CompensationSOT23-6 Package< 50-mW No-Load PowerPrimary-Side Regulation (PSR) Eliminates Opto-CouplerDynamic BJT Drive± 5% Voltage and Current Regulation Across Lineand Load80-kHz Maximum Switching Frequency EnablesHigh-Power Density Charger DesignsQuasi-Resonant Valley-Switching Operation forHighest Overall EfficiencyWide VDD Range Allows Small Bias CapacitorOutput Overvoltage, Low-Line, and OvercurrentProtection FunctionsProgrammable Cable CompensationSOT23-6 Package
Description
AI
The UCC28722 flyback power supply controller provides isolated-output constant-voltage (CV) and constant-current (CC) output regulation without the use of an optical coupler. The device processes information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.
Dynamically-controlled operating states and a tailored modulation profile support high-efficiency operation at all load levels without sacrificing output transient response.
Control algorithms in the UCC28722 device allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor power switch, enabling lower-cost converter design. Discontinuous conduction mode (DCM) with valley switching reduces switching losses, while 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. Output overvoltage and overcurrent as well as input undervoltage protection features help keep primary and secondary component stresses in check. The UCC28722 also allows compensation for voltage drop in the cable to be programmed with an external resistor.
The UCC28722 flyback power supply controller provides isolated-output constant-voltage (CV) and constant-current (CC) output regulation without the use of an optical coupler. The device processes information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.
Dynamically-controlled operating states and a tailored modulation profile support high-efficiency operation at all load levels without sacrificing output transient response.
Control algorithms in the UCC28722 device allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor power switch, enabling lower-cost converter design. Discontinuous conduction mode (DCM) with valley switching reduces switching losses, while 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. Output overvoltage and overcurrent as well as input undervoltage protection features help keep primary and secondary component stresses in check. The UCC28722 also allows compensation for voltage drop in the cable to be programmed with an external resistor.