UCC2809-2 - 经济型初级侧控制器

UCC2809-2是TI德州仪器公司的一款PWM与谐振控制器产品，UCC2809-2是经济型初级侧控制器，本站介绍了UCC2809-2的封装应用图解、特点和优点、功能等，并给出了与UCC2809-2相关的TI元器件型号供参考。

UCC2809-2 - 经济型初级侧控制器 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

The UCC3809 family of BCDMOS economy low power integrated circuits contains all the control and drive circuitry required for off-line and isolated DC-to-DC fixed frequency current mode switching power supplies with minimal external parts count. Internally implemented circuits include undervoltage lockout featuring startup current less than 100µA, a user accessible voltage reference, logic to ensure latched operation, a PWM comparator, and a totem pole output stage to sink or source peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.

Oscillator frequency and maximum duty cycle are programmed with two resistors and a capacitor. The UCC3809 family also features full cycle soft start.

The family has UVLO thresholds and hysteresis levels for off-line and DC-to-DC systems as shown in the table to the left.

The UCC3809 and the UCC2809 are offered in the 8 pin SOIC (D), PDIP (N), TSSOP (PW), and MSOP (P) packages. The small TSSOP and MSOP packages make the device ideal for applications where board space and height are at a premium.

产品特性

User Programmable Soft Start With Active Low Shutdown
User Programmable Maximum Duty Cycle
Accessible 5V Reference
Undervoltage Lockout
Operation to 1MHz
0.4A Source/0.8A Sink FET Driver
Low 100µA Startup Current

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