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UCC28703 - 具有初级侧稳压功能的恒压恒流 PWM
UCC28703是TI德州仪器公司的一款反激式控制器产品，UCC28703是具有初级侧稳压功能的恒压恒流 PWM，本站介绍了UCC28703的封装应用图解、特点和优点、功能等，并给出了与UCC28703相关的TI元器件型号供参考。
UCC28703 - 具有初级侧稳压功能的恒压恒流 PWM - 反激式控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器
- < 30-mW No-Load Power for 5-Star Rating
- Primary-Side Regulation (PSR) Eliminates Opto-Coupler
- ±5% Voltage and Current Regulation
- 130-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs
- Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency
- Patent-Pending Frequency-Jitter Scheme to Ease EMI Compliance
- Wide VDD Range Allows Small Bias Capacitor
- Clamped Gate-Drive Output for MOSFET
- Protection Functions: Overvoltage, Low-Line, and Overcurrent
- Programmable Cable Compensation (UCC28700 Only)
- NTC Resistor Interface (UCC28701, UCC28702 and UCC28703 Only) With Fixed Cable Compensation Options
- SOT-23 Package
- USB-Compliant Adapters and Chargers for Consumer Electronics (Cell Phones, Tablets and Cameras)
- AC and DC Power Supplies
The UCC28700 family of flyback power supply controllers provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. Low start-up current, dynamically controlled operating states and a tailored modulation profile support very low standby power without sacrificing start-up time or output transient response.
Control algorithms in the UCC28700 family allow operating efficiencies to meet or exceed applicable standards. The output drive 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 controllers have a maximum switching frequency of 130 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28700 allows the level of cable compensation to be programmed. The UCC28701, UCC28702, and UCC28703 devices allow remote temperature sensing using a Negative Temperature Coefficient (NTC) resistor while providing fixed cable-compensation levels.
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| UCC28700 | SOT-23 (6) | 2.90 mm × 1.60 mm |
| UCC28701 | ||
| UCC28702 | ||
| UCC28703 |
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