#UCC28019

UCC28019 is a high-performance dual-mode boost/buck controller utilizing Current Mode Control (CRM) technology, primarily designed for power conversion and LED driving applications. This device operates within a wide range of input voltages and offers programmable output voltage and output current limiting features, boasting high efficiency, low cost, and excellent immunity to interference.

1. Pinout and Functions of UCC28019
   The UCC28019 device consists of 8 pins, each serving the following functions:

• Pin 1: VSENSE - Open loop voltage feedback input
• Pin 2: CS - Current sensor input
• Pin 3: GND - Ground
• Pin 4: COMP - Output comparator compensation pin
• Pin 5: FB - Feedback input
• Pin 6: RT/CT - Reference voltage output pin/Capacitor time constant selection
• Pin 7: VCC - Power supply input
• Pin 8: OUT - Positive output

2. Application Circuit of UCC28019
   Below is a typical application circuit of a dual-mode boost/buck converter based on UCC28019:
   This circuit comprises a UCC28019 controller, two power switch MOSFETs, and several auxiliary components. The input voltage VIN passes through filtering before entering MOSFET Q1, modulated by the PWM signal from UCC28019, then stored in L1 to output energy to the load. Simultaneously, Q2 modulates its switch according to the PWM signal to ensure stable output voltage.

3. Summary
   UCC28019 stands out as a high-performance power conversion controller featuring programmable voltage and output current characteristics. It achieves a balanced blend of high efficiency, cost-effectiveness, and robust interference resistance. Widely applicable, it finds use in various scenarios, including but not limited to LED driving and inverters.