SLUUD39B May   2024  – November 2024 UCC33421-Q1

 

  1.   1
  2.   Description
  3.   Features
    1.     Applications
  4.   5
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Device Information
      1. 1.3.1 U1 Component Selection
      2. 1.3.2 UCC33421-Q1 Pin Definition
    4. 1.4 Specification
  6. 2Hardware
    1. 2.1 EVM Setup and Operation
      1. 2.1.1 Recommended Test Equipment
      2. 2.1.2 External Connections for Easy Evaluation
      3. 2.1.3 Powering the EVM
        1. 2.1.3.1 Power on for Start-up
        2. 2.1.3.2 Power off for Shutdown
      4. 2.1.4 EVM Test Points
      5. 2.1.5 Oscilloscope Probes: Probing the EVM
  7. 3Implementation Results
    1. 3.1 Schematic
    2. 3.2 Performance Data
      1. 3.2.1 Efficiency Data
      2. 3.2.2 Regulation Data
      3. 3.2.3 Startup Waveforms
      4. 3.2.4 Inrush Current
      5. 3.2.5 AC Ripple Voltage
      6. 3.2.6 Load Transient
      7. 3.2.7 VCC Short-Circuit
      8. 3.2.8 Thermal Performance
  8. 4Hardware Design Files
    1. 4.1 Assembly and Printed Circuit Board (PCB)
    2. 4.2 Bill of Materials (BOM)
  9. 5Additional Information
    1. 5.1 Trademarks
  10. 6Revision History

1.3.2 UCC33421-Q1 Pin Definition

Figure 1-1 UCC33421-Q1 Package Top View
Table 1-3 UCC33421-Q1 Pin Description
PIN TYPE (1) DESCRIPTION
NAME NO.
EN/FLT 1 I/O

Multi-functional enable input pin and output fault pin. Connect to microcontroller through an 18kΩ or greater pull-up resistor.

Enable input pin: Forcing EN low disables the device. Pull high to enable normal device functionality.

Fault output pin: This pin is pulled low for 200μs to alert that power converter is shutdown due to a fault condition.
VINP 2, 3 P Primary input supply voltage. Connect parallel 15nF (CIN1) 0402, and 10µF (CIN2) ceramic bypass capacitors close to VINP to GNDP pins.
GNDP 4, 5, 6, 7, 8 G Power ground return connection for VINP.
SEL 9 I VCC selection pin. VCC setpoint is 5V when SEL is connected to VCC and 5.5V when SEL is shorted to GNDS.
VCC 10, 11 P Isolated supply output voltage pin. Connect parallel 15nF (COUT1) 0402, and 22µF (COUT2) ceramic bypass capacitors close to VCC and GNDS pins.
GNDS 12, 13, 14, 15, 16 G Power ground return connection for VCC.
(1) P=Power, G=Ground, I=Input, O=Output