Using the UCC28250EVM-564 User's Guide Literature Number: SLUU441A September 2010 – Revised October 2011
User's Guide SLUU441A – September 2010 – Revised October 2011 Half-Bridge DC-to-DC Converter With Secondary-Side Control 1 Introduction This EVM is to aid in evaluating UCC28250 PWM device with secondary-side control in DC-to-DC symmetrical half-bridge converter topology. The targeted application is telecom module design with nominal 48-V input. UCC28250 is a PWM controller that can be used for primary-side control or secondary-side control.
Electrical Performance Specifications www.ti.com 3 Electrical Performance Specifications Table 1. UCC28250EVM-564 Electrical Performance Specifications PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Input Characteristics Voltage range 36 48 75 V Maximum input current VIN = 36 V and IOUT = 30 A 3.5 A No load input current VIN = 75 V 90 mA Output Characteristics Output voltage, VOUT Output current = 0 A 3.25 3.
Schematic Schematic + + 4 www.ti.com Figure 1.
Test Setup www.ti.com 5 Test Setup 5.1 Test Equipment Voltage source for main power: HP 6015A DC power supply Voltage source for secondary initial bias: 8.0-V/0.1-A DC voltage source compatible Multimeters: Fluke 45 dual display multimeter Output load: HP 6060A DC electronic load Oscilloscope: Tektronix TDS 460 A 400 MHz Fan: 200 LFM minimum compatible Recommended wire gauge: AWG #18 for input voltage connection. AWG #16 for output load connection. + A1 V1 _ Recommended Test Setup DC Source 5.
Test Setup 5.3 www.ti.com List of Test Points Table 2.
Test Procedure www.ti.com 6 Test Procedure Set up the EVM based on Figure 2. CAUTION High voltage and high temperature present when the EVM is in operation! 6.1 Line/Load Regulation and Efficiency Measurement Procedure 1. 2. 3. 4. Verify and confirm J3 jumper is placed across pin 2 to 1. Verify switch S1 is on position A. Connect the ammeter A1 (0 A to 10 A range) between DC source and J1 as shown in Figure 2.
Performance Data and Typical Characteristic Curves 7 www.ti.com Performance Data and Typical Characteristic Curves Figure 3 through Figure 11 present typical performance curves for UCC28250EVM-564. 7.1 Efficiency EFFICIENCY vs OUTPUT CURRENT 100 36 V 95 90 h - Efficiency - % 85 48 V 80 75 60 V 70 75 V 65 60 55 50 45 40 0 5 10 15 20 25 30 25 30 IOUT - Output Current - A Figure 3. Efficiency 7.2 Load Regulation OUTPUT VOLTAGE vs OUTPUT CURRENT 3.40 3.38 VOUT - Output Voltage - V 3.
Performance Data and Typical Characteristic Curves www.ti.com 7.3 Bode Plot GAIN/PHASE vs FREQUENCY 50 150 Phase 120 30 90 20 60 10 30 Gain 0 0 -10 -30 -20 -60 -30 -90 -40 -120 Gain - dB Gain - dB 40 -150 -50 0.1 1.0 10.0 100.0 f - Frequency - kHz Figure 5. Loop Response Gain and Phase 7.4 Turn-On Waveform Figure 6.
Performance Data and Typical Characteristic Curves 7.5 www.ti.com Turn-On Waveform with Pre-biased Output Voltage Figure 7. Enable Turn-On Waveform 7.6 Turn-On Waveform with Pre-biased Output Voltage Figure 8.
Performance Data and Typical Characteristic Curves www.ti.com 7.7 Turn-On Waveform with Pre-biased Output Voltage Figure 9. Enable Turn-On Waveform 7.8 Turn-Off Waveform Figure 10.
Performance Data and Typical Characteristic Curves 7.9 www.ti.com Output Ripple Figure 11.
EVM Assembly Drawing and PCB Layout www.ti.com 8 EVM Assembly Drawing and PCB Layout The following figures (Figure 12 through Figure 17) show the design of the UCC28250EVM-564 printed circuit board. PCB dimensions: L x W = 4.0 in x 2.3 in, PCB material: FR406 or compatible, four layers and 2-oz copper on each layer. EN ON A B A B Figure 12. Top Layer Assembly Drawing (top view) Figure 13.
EVM Assembly Drawing and PCB Layout www.ti.com Figure 14. Top Copper (top view) Figure 15.
EVM Assembly Drawing and PCB Layout www.ti.com Figure 16. Internal Layer 2 (top view) Figure 17.
List of Materials 9 www.ti.com List of Materials The EVM components list according to the schematic shown in Figure 1. Table 3. UCC28250EVM-564 List of Materials QTY 16 REF DES DESCRIPTION PART NUMBER MFR 5 C1, C3, C4, C6, C9 Capacitor, ceramic, 50 V, X5R, ±10%, 1.
List of Materials www.ti.com Table 3. UCC28250EVM-564 List of Materials (continued) QTY REF DES DESCRIPTION PART NUMBER MFR 1 R15 Resistor, chip, 1/16 W, ± 5%, 0 Ω, 603 Std Std 1 R16 Resistor, chip, 1/16 W, ± 1%, 75.0 kΩ, 603 Std Std 2 R17, R19 Resistor, chip, 1/16 W, ± 1%, 402 Ω, 603 Std Std 1 R18 Resistor, chip, 1/16 W, ± 1%, 4.64 kΩ, 603 Std Std 3 R2, R13, R23 Resistor, chip, 1/16 W, ± 1%, 5.11 kΩ, 603 Std Std 1 R20 Resistor, chip, 1/16 W, ± 1%, 6.
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