DEMO MANUAL DC1498A LTM4620EV High Efficiency, Dual 13A Step-Down Power µmodule Regulator Description

Transcription

1 DEMO MANUAL DC98A LTM6EV High Efficiency, Dual A Step-Down Power µmodule Regulator Description DC98A features the LTM 6EV, the high efficiency, high density, dual A, switch mode step-down power module regulator. The input voltage is from.5v to 6V. The output voltage is programmable from.6v to.5v. DC98A can deliver nominal A output current and up to A maximum in each channel. As explained in the data sheet, output current derating is necessary for certain V IN, V OUT, and thermal conditions. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE jumper (JP) selects pulse-skipping mode for noise sensitive applications or Burst-Mode operation in less noise sensitive applications. Two outputs can be connected in parallel for a single 6A output solution with optional jumper resistors. The board allows the user to program how its output ramps up and down through the TRACK/SS pin. The output can be set up to either coincidentally or ratiometrically track with another supply s output. Remote output voltage sensing is available for improved output voltage regulation at the load point. These features and the availability of the LTM6EV in a compact 5mm 5mm.mm LGA package make it ideal for use in many high-density point-of-load regulation applications. The LTM6 data sheet must be read in conjunction with this demo manual prior to working on or modifying DC98A. Design files for this circuit board are available at L, LT, LTC, LTM, µmodule, Linear Technology, the Linear logo and µmodule are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Board Photo

2 DEMO MANUAL DC98A Performance Summary (T A = 5 C) PARAMETER CONDITIONS VALUE Input Voltage Range.5V to 6V Output Voltage V OUT V IN =.5V to 6V, I OUT = A to A, JP: CCM.5V ±.5% (.775V to.55v) Output Voltage V OUT V IN =.5V to 6V, I OUT = A to A, JP: CCM.V ±.5% (.8V to.8v) Per-Channel Maximum Continuous Output Current Derating is Necessary for Certain V IN, V OUT and Thermal A (Per Channel) Conditions. See data sheet for detail. Default Operating Frequency 6kHz Resistor Programmable Frequency Range 5kHz to 78kHz External Clock Synchronous Frequency Range khz to 78kHz Efficiency of Channel V IN = 5V, V OUT =.5V, I OUT = A, f SW = 6kHz 87.7% See Figure Efficiency of Channel V IN = 5V, V OUT =.V, I OUT = A, f SW = 6kHz 85.% See Figure Load Transient of Channel V IN = V, V OUT =.5V, I SETP = A to 6A See Figure Load Transient of Channel V IN = V, V OUT =.V, I SETP = A to 6A See Figure 5 Quick Start Procedure LTM6 Demo Cards for Up to A Point-of-Load Regulation MAXIMUM OUTPUT CURRENT (A) NUMBER OF OUTPUT VOLTAGES NUMBER OF LTM6 µmodule REGULATORS ON THE BOARD DEMO CARD NUMBER, DC98A 5 DC78A-A 75 DC78A-B DC78A-C DC98A is easy to set up to evaluate the performance of the LTM6EV. Please refer to Figure for proper measurement setup and follow the procedure below:. Place jumpers in the following positions for a typical application: JP JP JP JP JP5 JP6 MODE RUN RUN TRACK SEL. TRACK SEL. CLKOUT PHASE CCM ON ON Soft-Start Soft-Start 9. With power off, connect the input power supply, load and meters as shown in Figure. Preset the load to A and V IN supply to V.. Turn on the power supply at the input. The output voltage in channel should be.5v ±.5% (.775V to.55v) and the output voltage in channel should be.v ±.5% (.8V to.8v).. Once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, output voltage ripple, efficiency and other parameters. Output ripple should be measured at J and J with BNC cables. 5Ω termination should be set on the oscilloscope or BNC cables. 5. (Optional) For optional load transient test, apply an adjustable pulse signal between IOSTEP CLK and test point. Pulse amplitude (V to.5v) sets the load step current amplitude. The output transient current can be monitored at the BNC connector J (5mV/A). The pulse signal should have very small duty cycle (<%) to limit the thermal stress on the transient load circuit. Switch the jumper resistors R or R5 (on the backside of boards) to apply load transient on channel or channel correspondingly.

3 DEMO MANUAL DC98A quick start procedure 6. (Optional) LTM6 can be synchronized to an external clock signal. Place the JP jumper on EXT_CLK and apply a clock signal (V to 5V, square wave) on the CLKIN test point. 7. (Optional) The outputs of LTM6 can track another supply. The jumpers JP and JP5 allow choosing softstart or output tracking. If tracking external voltage is selected, the corresponding test points, TRACK and TRACK, need to be connected to a valid voltage signal. 8. (Optional) LTM6 can be configured for a -phase single output at up to 6A on DC98A. Install Ω resistors on R, R7, R8, R9 and remove R7, R9. Output voltage is set by R5 based on equation V OUT =.6V ( + 6.k/R5). Figure. Test Setup of DC98A

4 DEMO MANUAL DC98A quick start procedure EFFICIENCY (%) V IN = 5V V IN = 9V V IN = V V IN = 5V 6 8 LOAD CURRENT (A) DC98A F EFFICIENCY (%) V IN = 5V V IN = 9V V IN = V V IN = 5V 6 8 LOAD CURRENT (A) DC98A F Figure. Measured Efficiency on Channel. V OUT =.5V, f SW = 6kHz, Channel Disabled Figure. Measured Efficiency on Channel V OUT =.V, f SW = 6kHz, Channel Disabled mv/div.5v OUT (MHz BW) mv/div.v OUT (MHz BW) A TO 6A LOAD STEP A TO 6A LOAD STEP µs/div DC98A F µs/div DC98A F5 Figure. Measured Channel A to 6A Load Transient, V IN = V, V OUT =.5V Figure 5. Measured Channel A to 6A Load Transient, V IN = V, V OUT =.V 5mV/DIV.5V OUT (MHz BW) 5mV/DIV.V OUT (MHz BW) 5µs/DIV DC98A F6 Figure 6. Measured Output Voltage Ripple at 5V Input,.5V and.v Output, A Per Channel with Standard Demo Circuit Default Setup

5 DEMO MANUAL DC98A quick start procedure Figure 7. Thermal Capture at 5V IN,.5V OUT at A and.v OUT at A. Ambient Temperature = C, No Airflow and No Heat Sink Figure 8. Thermal Capture at 5V IN,.5V OUT at A and.v OUT at A. Ambient Temperature = C, No Airflow and No Heat Sink 5

6 DEMO MANUAL DC98A quick start procedure Figure 9. Thermal Capture at V IN,.5V OUT at A and.v OUT at A. Ambient Temperature = C, No Airflow and No Heat Sink Figure. Thermal Capture at V IN,.5V OUT at A and.v OUT at A. Ambient Temperature = C, No Airflow and No Heat Sink 6

7 DEMO MANUAL DC98A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER, PART NUMBER Required Circuit Components CIN, CIN, CIN, CIN5 Capacitor, X5R, µf, 5V, %, Murata, GRMER6E6KE5 COUT, COUT7 Capacitor, 7µF, V, POSCAP, F8 Sanyo, TPE7MCL COUT, COUT5 Capacitor, X5R, µf, 6.V, % AVX, 6D7MATA R, R, R6 Resistor, Chip, k, %, 6 NIC, NRC6FRTRF 5 R9 Resistor, Chip, 6.k, %, 6 Vishay, CRCW66KFKED 6 R5 Resistor, Chip,.k, %, 6 Vishay, CRCW6KFKED 7 R Resistor, Chip, 58k, %, 6 Vishay, CRCW658KFKED 8 U LTM6EV, 5mm 5mm.mm LGA Linear Technology, LTM6EV Additional Demo Board Circuit Components 9 CIN Capacitor, 5µF, 5V, Aluminum Electr. Sun Electronics, 5CE5AX COUT, COUT, COUT6, COUT8 Optional C Optional, 85 C Capacitor, X7R, µf, 5V, %, 85 AVX, 85C5KATA C5, C7 Capacitor, X5R,.µF, 5V, %, 6 AVX, 6DKAT C, C, C6, C8-C Optional, 6 5 C, C Capacitor, X5R,.µF, 5V, %, 6 AVX, 65CKAT 6 C5, C6 Capacitor, X7R, µf, V, %, 6 AVX, 6ZC5KAT 7 Q N-Channel V MOSFET Vishay, SUD5N-9P 8 R Resistor, Chip, k, %, 6 NIC, NRC6FRTRF 9 R, R, R6, R8, R, R, R6, R7, R R, R8, R, R, R9, R Optional, 6 R5, R, R7, R6 Resistor, Chip, k, %, 6 Vishay, CRCW6KFKED R7, R, R9, R Resistor, Chip, k, %, 6 Vishay, CRCW6ZED 5 R9, R, R5, R8 Resistor, Chip, 6.k, %, 6 Vishay, CRCW66KFKED R, R Resistor, Chip, 6.k, %, 6 Vishay, CRCW66KFKED R Resistor, Chip, Ω,.5W, Vishay, CRCWZEF 5 R5 Optional, 6 R7 Resistor, Chip,.5Ω, W, 5 Vishay, WSL5R5FEA 7 R8 Optional, 5 Hardware For Demo Board Only 8 6 E, E-E, E-E6 Testpoint, Turret,.9" PBF Mill-Max, J, J, J Conn, BNC, 5 Pins Connex 6 J J9 Jack Banana Keystone, 575- JP Header Pin.79 Double Row Samtec, TMM--L-D JP6 Header Pin.79 Single Row Samtec, TMM--L-S JP, JP, JP Header Pin.79 Single Row Samtec, TMM--L-S JP5 Header Pin.79 Double Row Samtec, TMM---L-D 5 6 XJP XJP6 Shunt,.79" Center Samtec, SN-BK-G 6 (Stand-Off) Stand-Off, Nylon.5" Keystone, 88 (Snap On) 7

8 5 5 DEMO MANUAL DC98A Schematic Diagrams TEMP CLKIN CLKOUT VO- R9 VO+ + E5 E6 E E VO+ E8 E INTVCC R MODE C VOUT D D.5V-6V INTVCC EXT_CLK J + CIN CIN CIN CIN CIN5 PS uf uf uf uf J8 VOUT 5V 5uF + R 5V 5V 5V BM COUT COUT COUT A 5V 5 6 uf CCM 7uF 6.V J5 7 8 INTVCC V - J9 RUN TEMP E5 JP C RUN VO- R ON R5 uf R ON OFF OFF K VO- VO- C R6 E9 JP JP C RUN R7 R8 R9 R TRACK SEL. L VOUTS 6.K 6.K L RUN M TRACK E TRACK M M VOUTS C8 TRACK SEL. R SOFT-START R M5 M6 RUN F9 6.K M7 M8 6.K TRACK D8 C C JP TRACK M9 TRACK EXT. TRACK M C5 M R6 SOFT-START E 5 6 C6 R5.uF RUN C8 JP5 R8 6.K F5 C7 6.K VO+ E5 S TRACK U VFB D7.uF VO+ C5 S VFB R9 LTM6EV SW G R 6.K E6 R C9 R TP SW DIFFOUT F8 DIFFOUT PGOOD G8 A A R A J6 A A COMP K COUT5 COUT6 COUT8 A5 + COUT7 B COMP E7 uf 6.V 7uF VFB C PGOOD B B G7 V S S G6 E B R5 C S F7 F6 B5 C J7 VO-.K S S C7 D6 C R6 C S C7 C M VO- M B B L E7 D5 L VFB K EXTVCC VO+ L9 L8 L7 L6 L5 L K L L K K9 K K K J J9 J J J J K8 K7 K6 K5 K J E6 COMP COMP J8 J5 J H H H H9 H7 H6 H5 H H E9 E8 C6 G A6 A7 B6 B7 D D D D D9 D D D E E E E E E E F F F F F F G G G G H H DIFFN DIFFP FSET PHASMD TEMP J6 MODE-PLLIN F CLKOUT G5 INTVCC H8 EXTVCC J7 VOUT A8 VOUT A9 VOUT A VOUT A VOUT A VOUT B8 VOUT B9 VOUT B VOUT B VOUT B VOUT C9 VOUT C VOUT C VOUT C SW G SW TP G9 PGOOD INTVCC R7 K C PGOOD E VO+ DIFFN R 58K R CLKOUT A INTVCC A PHASE o DIFFP o TECHNOLOGY 9 o 6 m JP6 8

9 5 5 DEMO MANUAL DC98A Schematic Diagrams DIFF SENSING SELECTION TEMP INTVCC R R VO- DIFFN R VO+ DIFFP R S D D R VOUTS DIFFOUT IONAL JUMPER FOR OUTPUT CONFIGURATION Load Transient Circuit C C R9 RUN RUN R TRACK TRACK R7 VFB VFB R8 COMP COMP J VOUT C.uF R OHm.5W R5 C.uF Q SUD5N-9P VOUT C5 uf C6 uf J E7 B B IOSTEP J R6 K IOSTEP CLK R7.5 W 5 R8 5 E8 TECHNOLOGY A A m 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. 9

10 DEMO MANUAL DC98A 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 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 6 McCarthy Blvd. Milpitas, CA 955 Copyright, Linear Technology Corporation LT REV A PRINTED IN USA Linear Technology Corporation 6 McCarthy Blvd., Milpitas, CA (8) -9 FAX: (8) LINEAR TECHNOLOGY CORPORATION