UCC28700 - 具有初级侧稳压功能的恒压恒流 PWM

UCC28700是TI德州仪器公司的一款反激式控制器产品，UCC28700是具有初级侧稳压功能的恒压恒流 PWM，本站介绍了UCC28700的封装应用图解、特点和优点、功能等，并给出了与UCC28700相关的TI元器件型号供参考。

UCC28700 - 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

产品特性

< 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

产品应用

USB-Compliant Adapters and Chargers for Consumer Electronics (Cell Phones, Tablets and Cameras)
AC and DC Power Supplies

产品说明

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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
UCC28700	SOT-23 (6)	2.90 mm × 1.60 mm
UCC28701
UCC28702
UCC28703

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