DEMO MANUAL DC74A LTM46 8A, High Voltage Power µmodule Regulator Description Demonstration circuit DC74A features the LTM 46EV, an EN550 class B certified, high input and output voltage, high efficiency, switch mode step-down power µmodule regulator. The input voltage range is from to 6V. The output voltage is jumper programmable from.v to V with a rated load current of 8A. Derating is necessary for certain V IN, V OUT, frequency and thermal conditions: please refer to LTM46 data sheet for derating curves. Only input and output capacitors are needed externally. The DC74A offers the TRACK/SS pin allowing the user to program output tracking or soft-start period. Output voltage margining can also be realized through jumper position selections. Higher efficiency at low load currents is achieved by setting the MODE pin jumper to DCM. The PLL pin is available to synchronize the LTM46EV to an external clock. The LTM46 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC74A. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, µmodule, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY (T A = 5 C) PARAMETER CONDITIONS VALUE Input Voltage Range to 6V Output Voltage V OUT Jumper Selectable.V,, V; ± % Maximum Continuous Output Current Derating Is Necessary for Certain Operating Conditions. See Data Sheet 8A DC for Details. Default Operating Frequency V OUT = V V OUT = V OUT =.V 600kHz 50kHz 65kHz Efficiency V IN = V, V OUT =, I OUT = 8A 9.0% See Figure Load Transient V IN = V, V OUT = See Figure 4 Board Photo
DEMO MANUAL DC74A quick start procedure Demonstration circuit DC74A is an easy way to evaluate the performance of the LTM46EV. Please refer to Figure for proper measurement equipment setup and follow the procedure below:. Place jumpers in the following positions for a typical.v OUT application: MODE MARG MARG0 V OUT SELECT RUN CCM LO LO.V ON. With power off, connect the input power supply, load and meters as shown in Figure. Preset the load to 0A and V IN supply to be 0V.. Turn on the power at the input. Increase V IN to V (do not hot-plug the input supply or apply more than the rated maximum voltage of 6V to the board or the part may be damaged). The output voltage should be regulated and deliver the selected output voltage ± %. 4. Vary the input voltage from to 6V and adjust the load current from 0A to 8A. Observe the output voltage regulation, ripple voltage, efficiency, and other parameters. 5. To measure input or output ripple, insert the scope probe to J7 or J4. 6. For optional load transient test, apply an adjustable pulse signal between IOSTEP_CLK and GND test points. The pulse amplitude sets the load step current amplitude. The pulse duty cycle should be low (< 5%) to limit the thermal stress on the load transient circuit. The load step current can be monitored with a BNC connected to J (0mV/A). The output voltage can be monitored at the probe jack J4.
DEMO MANUAL DC74A quick start procedure + V A + LOAD + V IN V + A + DC74A F0 Figure. Proper Measurement Equipment Setup
DEMO MANUAL DC74A quick start procedure SCOPE PROBE DC74A F0 Figure. Measuring V IN or V OUT Ripple Efficiency vs Load Current (V IN = V) Efficiency vs Load Current (V IN = 4V) Efficiency vs Load Current (V IN = 6V) 00 00 00 95 95 95 90 90 90 85 85 85 EFFICIENCY (%) 80 75 70 65 EFFICIENCY (%) 80 75 70 65 EFFICIENCY (%) 80 75 70 65 60 55 50 0 4 6 8 LOAD CURRENT (A) V OUT =.V V OUT = 60 55 50 0 V OUT =.V V OUT = V OUT = V 4 6 8 LOAD CURRENT (A) 60 55 50 0 4 6 8 LOAD CURRENT (A) V OUT =.V V OUT = V OUT = V DC74A F0a DC74A F0b DC74A F0c Figure. Measured DC74A Efficiency at Different V IN and V OUT (DCM Mode Enabled) 4
DEMO MANUAL DC74A quick start procedure I OUT_STEP 5A/DIV I OUT_STEP 5A/DIV V OUT 00mV/DIV V OUT 00mV/DIV DC74A F04a 00µs/DIV V IN = V, V OUT = 0A TO 4A LOAD STEP C OUT = x47µf/6v/poscap+x47µf/6v/x5r+x0µf/6v/x5r DC74A F04b 00µs/DIV V IN = 4V, V OUT = V 0A TO 4A LOAD STEP C OUT = x47µf/6v/poscap+x47µf/6v/x5r+x0µf/6v/x5r Figure 4. Measured Load Transient Responses V IN = 4V V OUT = V I LOAD = 8A AMBIENT TEMPERATURE =. C NO FORCED AIR FLOW DC74A F05 Figure 5. Thermal Image of LTM46 5
DEMO MANUAL DC74A parts list ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CFF CAP, NPO 47pF 50V 0% 060 AVX 0605A470KATA CIN CAP, ALUM 00µF 50V 0% SUNCON 50CE00FS 5 CIN, CIN, C8, C9, C0 CAP, X5R 0µF 50V 0% TAIYO YUDEN UMK5BJ06MM-T 4 COUT, COUT, COUT6 CAP, X5R 47µF 6V 0% TAIYO YUDEN EMK5BJ476MM 5 COUT4 CAP, X5R 0µF 6V 0% TDK C5X5RC06M 6 COUT5 CAP, X7R µf 6V 0% 060 TDK C608X7RC05K 7 COUT7 CAP, POSCAP 47µF 6V 0% 74 SANYO 6TQC47M 8 CSS CAP, X7R 0.µF 6V 0% 060 AVX 060YC04MATA 9 R4 RES, CHIP.k 0.06W % 060 VISHAY CRCW060KFKEA 0 R6 RES, CHIP.7k 0.06W % 060 VISHAY CRCW060K7FKEA R7 RES, CHIP 5.k 0.06W % 060 YAYEO, RC060FR-075KL R, R RES, CHIP 5k 0.06W 5% 060 VISHAY CRCW0605K0JNEA R5 RES, CHIP 0k 0.06W 5% 060 VISHAY CRCW0600K0JNEA 4 R4 RES, CHIP 9k 0.06W % 060 VISHAY CRCW0609KFKEA 5 D ZENER DIODE, 5.V SOT ON SEMICONDUCTOR MMBZ5B 6 U I.C., VOLTAGE REG LINEAR TECHNOLOGY CORPORATION LTM46EV Additional Demo Board Circuit Components Q MOSFET, N-CHANNEL 0V VISHAY SILICONIX SUD50N0-09 C CAP, X7R µf 6V 0% 060 TDK C608X7RC05K 0 COUT, CIN4, CIN5 CAP, 4 0 CIN6 CAP, 0805 5 0 C, C, C6, C7, CP CAP, 060 6 R RES, CHIP 0k 0.06W 5% 060 VISHAY CRCW0600K0JNEA 7 R RES, LRC 0.00 W 5% 5 IRC LRF5-0-R00-J 8 R5, R9 RES, CHIP 0Ω /6W A 060 VISHAY CRCW060000Z 9 0 R6, R7, R8, R0, R, R Hardware RES, 060 4 JP, JP, JP, JP4 HEADERS, PINS mm CTRS SAMTEC TMM-0-0-L-S JP5, JP6, JP7 JUMPER, PINS mm CTRS SAMTEC TMM-0-0-L-S 4 J, J, J5, J6 CONNECTOR, BANANA JACK KEYSTONE 575-4 4 J BNC CONNECTOR CONNEX 404 5 J4, J7 TEST PROBE, CONNECTOR TEKTRONIC -45-00 6 E TO E4, E6 TO E TURRET, TESTPOINT MILL MAX 50--00-80-00-00-07-0 6
5 5 4 4 DEMO MANUAL DC74A Schematic Diagram + E J7 ECO REV REVISION HISTORY DESCRIPTION APPROVED DATE J - 6V CIN CIN CIN CIN4 CIN5 CIN6 + CIN 00uF 0uF 0uF J 50V 50V 50V 0805 GND D D E - C uf 6V Q E SUD50N0-09 IOSTEP_CLK R 0K R 5K J E4 A6 L PGOOD C8 0uF B6 VD L VD C0 B7 L C9 C VD L4 IOSTEP 50V 0uF 0uF C VD L5 C VD L6 R C C4 VD MARG0 L7 C5 VD L8 0.00 H I C6 L9 5% VD C7 L0 W J4 VD VD L 5 G LO R5 M PGOOD R4 M A JP C M COUT5 0 Ohm MPGM 9K B M4 uf MPGM U % M5 6V A7 M6 C C INTVCC MARG M7 C M8 H I C MARG0 LTM46EV M9 E6 MARG VO+ D M0 J5 MARG M C0 LO E DRVCC COUT6 COUT COUT COUT COUT4 +.V / / V 47uF 47uF 47uF 0uF E DRVCC 47uF JP @ 8A DRVCC 6V 6V 6V 6V B PLLIN A8 6V J6 74 FSET GND MODE A R6 DCM COMP D TRACK/SS A9 E7 COMP C6 VO- CCM RUN A0 FSET R8 JP M RUN B9 E8 FCB F J PLLIN VFB D9 K E9 MTP H SGND MTP L CP SGND MTP R7 GND R9 E0 B B TRACK/SS E CSS 0 Ohm COMP CFF 0.uF R0 R 47pF R RUN ON 5K C7 NOTE: UNLESS OTHERWISE SPECIFIED. OFF. ALL RESISTORS R ALL CAPACITORS JP4 JP5 R4.V.K. INSTALL SHUNTS AS SHOWN. % R5 JP6 R6 0K.7K APPROVALS www.linear.com % JP7 R7 TECHNOLOGY A A D V 5.K 5.V % E SGND D D D D4 D5 D6 E E E E4 E5 E6 E7 E8 F F F F4 F5 F6 F7 F8 F9 G G G G4 G5 G6 G7 G8 G9 G0 G H H H H4 H5 H6 H7 H8 H9 H0 H A A A A4 A5 B B B B4 B5 J J J J4 J5 J6 J7 J8 J9 J0 J K K K K4 K5 K6 K7 K8 K9 K0 K Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 7
DEMO MANUAL DC74A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 0 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 60 McCarthy Blvd. Milpitas, CA 9505 Copyright 004, Linear Technology Corporation 8 LT 04 PRINTED IN USA Linear Technology Corporation 60 McCarthy Blvd., Milpitas, CA 9505-747 (408) 4-900 FAX: (408) 44-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 0