Texas Instruments UCC2891 - Manuals

www.ti.com 3 UCC2891EVM Electrical Performance Specifications 4 Schematic UCC2891EVM Electrical Performance Specifications The UCC2891EVM electrical performance specifications are listed in Table 1 . Table 1. UCC2891EVM Performance Summary PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Input Characteri...

www.ti.com + + + + Schematic Figure 1. UCC2891EVM Schematic 6 Using the UCC2891 Active Clamp Current Mode PWM Controller SLUU178A – November 2003 – Revised December 2006 Submit Documentation Feedback

www.ti.com 5 EVM Test Setup V 2 - + J1 +V out -V out J9 J10 Loop+ Loop- J6 J7 Texas InstrumentsHPA 034UCC2891 A ctive Clamp Converter J3 V -Clamp J2 Q2 Gate J4 SR-QF Gate J5 SR-QR Gate LOA D1 3.3V /30A - + A 1 V IN - + V 1 FA N + + - - - + +V IN -V IN DANGER HIGH VOLTAGE +V OUT -V OUT J8 EVM Test Se...

www.ti.com 6 Power Up/Down Test Procedures Power Up/Down Test Procedures The following test procedure is recommended primarily for power up and shutting down the EVM.Whenever the EVM is running above an output load of 15 A DC , the fan should be turned on. Also, never walk away from a powered EVM fo...

www.ti.com 7 Power Up/Down Test Procedures 81 79 87 83 91 89 93 85 2 6 18 26 22 10 14 I OUT - Output Current - A V IN = 36 V V IN = 72 V V IN = 48 V P e rc e n t E ff ic ie n c y - % V OUT = 3.3 V f S = 300 kHz OVERALL EFFICIENCY vs OUTPUT CURRENT 10 -40 -60 100 1 k 10 k 100 k 0 -20 40 20 60 -120 -1...

www.ti.com t − Time − 2.5 µ s/div V IN = 36 V I OUT = 30 A 500 mV/div 1 V peak-to-peak Input Ripple Voltage 10 -40 -60 100 1 k 10 k 100 k 0 -20 40 20 60 -120 -180 0 -60 120 60 180 V IN = 48 V I OUT = 10 A g M = -10 dB F M = 50° Gain Phase f - Frequency - Hz G a in - d B P h a s e - ° GAIN AND PHASE ...

www.ti.com t − Time − 1 µ s/div V IN = 36 V 6.3 V, QF Gate (J5)(5 V/div) 8.4 V, QR Gate (J6)(5 V/div) SR Gate Drive t − Time − 2.5 µ s/div V IN = 36 V I OUT = 30 A 50 mV/div 23 mV peak-to-peak Output Ripple Voltage t − Time − 1 µ s/div V IN = 72 V 12.3 V, QF Gate (J5)(5 V/div) 5.4 V, QR Gate (J6)(5 ...

www.ti.com 8 EVM Assembly Drawing and Layout EVM Assembly Drawing and Layout Figure 14 through Figure 20 show the top-side and bottom-side component placement for the EVM, as well as device pin numbers where necessary. A four layer PCB was designed using the top and bottomlayers for signal traces an...

www.ti.com EVM Assembly Drawing and Layout Figure 15. Top Side Silk Screen Figure 16. Top Signal Trace Layer 14 Using the UCC2891 Active Clamp Current Mode PWM Controller SLUU178A – November 2003 – Revised December 2006 Submit Documentation Feedback

www.ti.com EVM Assembly Drawing and Layout Figure 17. Internal Split Ground Plane Figure 18. Internal Signal Trace Layer SLUU178A – November 2003 – Revised December 2006 Using the UCC2891 Active Clamp Current Mode PWM Controller 15 Submit Documentation Feedback

www.ti.com EVM Assembly Drawing and Layout Figure 19. Bottom Signal Trace Layer Figure 20. Bottom Side Component Assembly Using the UCC2891 Active Clamp Current Mode PWM Controller 16 SLUU178A – November 2003 – Revised December 2006 Submit Documentation Feedback

www.ti.com 9 List of Materials List of Materials The following table lists the UCC2891EVM components corresponding to the schematic shown in Figure 1 . Table 2. List of Materials QT REF DESCRIPTION MFR PART NUMBER Y C1, C2, C4 3 Capacitor, ceramic, 2.2 µ F, 100 V, X7R, 20%, 1812 TDK C4532X7R2A225M C...

www.ti.com 10 References References Table 2. List of Materials (continued) QT REF DESCRIPTION MFR PART NUMBER Y R1 1 Resistor, chip, 8.45 k Ω , 1/10 W, 1%, 805 Vishay CRCW0805-8451-F R2 1 Resistor, chip, 57.6 k Ω , 1/10 W, 1%, 805 Vishay CRCW0805-5762-F R3 1 Resistor, chip, 76.8 k Ω , 1/10 W, 1%, 80...

EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods b...

DYNAMIC WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 0 Vdc to 72 Vdc. Exceeding the specified input range may cause unexpected operation and/or irreversible damageto the EVM. If there are questions concerning the input range, please contact a TI fie...