Specifications are at T A = 25 C

Transcription

1 DESCRIPTION Demonstration circuit 66A is a buck-boost 500mA charge pump with pin selectable output voltages and includes a watchdog timer featuring the LTC 6EMSE. The LTC6 operates with a wide input voltage range from.7v to 8V and is engineered for diagnostic coverage for ISO 66 compliant systems. The wide V IN operating range will allow the LTC6 to provide up to 500mA sufficiently during an automotive cold crank. DEMO MANUAL DC66A LTC6EMSE Wide V IN Range Buck-Boost Charge Pump with Watchdog Timer The LTC6 data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual. Design files for this circuit board are available at L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY Specifications are at T A = 5 C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V IN V IN Input Voltage Range.7 8 V V ADJ SEL = LOW, SEL = HIGH.7V < V IN < 8V.07.. V V OUTS_5 SEL = HIGH, SEL = LOW.7V < V IN < 8V V V OUTS_ SEL = HIGH, SEL = HIGH.7V < V IN < 8V.7.. V BOARD PHOTO

2 DEMO MANUAL DC66A TYPICAL APPLICATIONS Regulated 5V Output with Pushbutton Reset Output Voltage vs Input Voltage.µF 5.0 V IN = V TO 0V µf V IN SEL SEL BIAS C + C LTC6 V OUT RST WDI 500k V OUT = 5V I OUT UP TO 500mA 0µF µc 500k V OUT (V) µF RT.90 WT PIN NOT USED IN THIS CIRCUIT: OUTS/ADJ GND RSTI DC66a TA0a RESET.85 I OUT = 50mA I OUT = 500mA V IN (V) DC66a TA0b QUICK START PROCEDURE Refer to Figure for the proper measurement equipment setup and jumper settings and follow the procedure below. NOTE: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the V IN or V OUT and GND terminals. See Figure for proper scope probe technique.. Make sure the jumper settings are as follows: JP: SEL is on the HI position JP: SEL is on the HI position JP: CRT is on the INT position JP: CWT is on the DIS position JP5: RSTI is on the HI position. Set PS to V and then turn on.. Slowly increase LD to 500mA and observe VOUT is regulating at.v and that the input current is about ½ of the output current. The LTC6 is in : mode.. Decrease PS to 5V and observe that VOUT is.v and the input current is about equal to the output current. The LTC6 is in : mode. 5. Decrease PS to V and observe that VOUT is.v and the input current is about x the output current. The LTC6 is in : mode. 6. Turn off PS and set LD to 0A. 7. Set the SEL jumper, JP, to the LO position. 8. Set PS to V and then turn on. 9. Slowly increase LD to 500mA and observe VOUT is regulating at 5V and that the input current is about ½ of the output current. The LTC6 is in : mode. 0. Decrease PS to 9V and observe that VOUT is 5V and the input current is about equal to the output current. The LTC6 is in : mode.. Decrease PS to.v and observe that VOUT is 5V and the input current is about x the output current. The LTC6 is in : mode.. Set PS to V and then turn off LD.. Short the RSTI turret to GND and observe that the voltage on the RST turret is near 0V.. Remove the short on the RSTI turret and observe with an oscilloscope that the voltage on the RST turret returns to about VOUT. Note: The reset time can be adjusted by setting the CRT jumper, JP, to the EXT position and using external capacitors if desired. The external CRT capacitor, C9, is populated with a.nf to match the times referenced in the data sheet. The reset time can be increased by placing a parallel capacitor on the

3 DEMO MANUAL DC66A QUICK START PROCEDURE optional C8 capacitor pads on the bottom side of the board. 5. Set the CWT jumper, JP, to the EXT positions and observe that the voltage on the RST turret is pulsing between 0V and VOUT. 6. Set a pulse generator with a 0 to 5V, ms pulse width and a 0ms period on the WDI turret. Observe the voltage on the RST turret is high. 7. Decrease the pulse period below.5ms and observe the voltage on the RST is pulsing again. 8. Slowly increase the pulse period to above 0ms and observed the voltage on the RST turret returns and stays at VOUT when the period is between about 0ms and about 60ms. The voltage on the RST turret starts to pulse again when the pulse period on the WDI turret increases above 0ms. Note: The watchdog time can be adjusted using external capacitors if desired. The external WDT capacitor, C6, is populated with a.nf to match the times referenced in the data sheet. The watchdog time can be increased by placing a parallel capacitor on the optional C7 capacitor pads on the bottom side of the board. 9. To observe the internal watchdog time, set the CWT jumper, JP, to the INT position. The watchdog upper boundary will now be about.6s and the lower boundary is about 50ms. 0. Turn off the loads, pulse generator and supply when done evaluation.. Return the jumpers to their default settings as shown in Figure if desired. Figure. Proper Measurement Equipment Setup for DC66A

4 DEMO MANUAL DC66A QUICK START PROCEDURE Figure. Measuring Input or Output Ripple APPLICATIONS INFORMATION Figures and illustrate how the efficiency and power loss changes as the input voltage increases for the 5V and.v output settings. A 7µF output capacitor was used on the demo board to provide better output ripple with voltages below.v. Refer to the VOUT ripple and capacitor selection of the data sheet for more information on output capacitor selection. EFFICIENCY (%) I OUT =500mA EFFICIENCY LOSS V IN (V) DC66a F0 Figure. 5V Efficiency and Power Loss vs Input Voltage 0 POWER LOSS (W) EFFICIENCY (%) I OUT =500mA EFFICIENCY LOSS V IN (V) DC66a F0 Figure..V Efficiency and Power Loss vs Input Voltage 0 POWER LOSS (W)

5 DEMO MANUAL DC66A APPLICATIONS INFORMATION Figures 5, 6, and 7 show the CISPR 5 class 5 peak conducted and radiated emissions. The data was collected using the ALSE antenna method and a CISPR5 LISN for conducted emissions. The EMI tests were conducted using a V input on the EMI input terminal, a 0Ω resistor on VOUT with VOUT set to 5V. Linear Technology has made every effort to provide useful and accurate EMI data, but it remains the responsibility of the customer to ensure product compliance. Figure 5. CISPR5 Conducted Emissions 5

6 DEMO MANUAL DC66A APPLICATIONS INFORMATION Figure 6. CISPR5 Radiated Emissions with Vertical Polarization 6

7 DEMO MANUAL DC66A APPLICATIONS INFORMATION Figure 7. CISPR5 Radiated Emissions with Horizontal Polarization 7

8 DEMO MANUAL DC66A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C CAP,.µF, X5R, 0V, 0%, 060 MURATA GRM88R6A5KED C CAP, µf, X7R, 50V, 0%, 0805 MURATA GRMBR7H05KAL C CAP, 7µF, X5R, 6.V, 0%, 060 MURATA GRM88R60J76ME5D C5 CAP, 0µF, 6.V, 0%, X5R, 060 TDK CORPORATION C608X5R0J06K080AB 5 U IC, WIDE V IN RANGE BB CHARGE PUMP WITH WD TIMER LINEAR TECHNOLOGY LTC6EMSE#PBF Additional Demo Board Circuit Components 6 C, C CAP, 0µF, X5R, 50V, 0%, 06 TDK C6X5RH06K 7 C6, C9 CAP, 00pF, C0G, 5V, 5%, 00 KEMET C00CJGACTU 8 0 C7, C8 CAP, OPTION, C0 CAP, OPTION, C CAP, 0.µF, X7R, 50V, 0%, 00 MURATA GRM55R7H0KED L IND,.7µH, FERRITE, 0%,.95A, 90mΩ, mm.5mm.5mm TDK VLF055MT-R7M R, R RES,00kΩ, 5%, /6W, 00 YAGEO RC00JR-0700KL R RES, 0Ω, /6W, 00 ROHM MCR0MZPJ000 0 R RES, OPTION, 00 5 R5, R7 RES, 50kΩ, 5%, /6W, 00 VISHAY CRCW0050KJNED 6 R6 RES, 0MΩ, 5%, /6W, 00 VISHAY CRCW000M0JNED Hardware: For Demo Board Only 7 5 E TO E, E TEST POINT, TURRET, 0.09", MTG HOLE MILL-MAX E5 TO E0 TEST POINT, TURRET, 0.06", MTG HOLE MILL-MAX JP, JP, JP,JP5 CONN, HDR, MALE,, mm, THT, STR WURTH ELEKTRONIK JP CONN, HDR, MALE,, mm, THT, STR WURTH ELEKTRONIK 6000 MP TO MP STANDOFF, NYLON, SNAP-ON, 0.50" KEYSTONE 88 5 XJP TO XJP5 CONN, SHUNT, FEMALE, POS, mm WURTH ELEKTRONIK

9 5 5 DEMO MANUAL DC66A SCHEMATIC DIAGRAM REVISION HISTORY ECO REV DESCRIPTION APPROVED DATE - PRODUCTION MM D D.7V - 8V GND SEL HI LO E SEL E5 7 SEL ADJ/OUTS 6 C C JP R SEL OPT R5 HI 5 LO SEL BIAS 50k SEL E6 BIAS 0 WDI BIAS 8 C5 0uF WDI E7 R6 0M RSTI RST E8 RST RT GND GND WT E9 RSTI 7 5 (6V MAX) VOUT JP5 R7 BIAS 50k E0 RSTI JP JP BIAS GND CRT CWT B B EMI.7V - 8V E E HI LO INT EXT INT EXT DIS C.uF C 7uF VOUT * VOUT 0-500mA E C 0.uF C 0uF C 0uF JP R 00k R 00k R 0 E C8 OPT C uf 6 9 C9 00pF C+ C- VOUT U LTC6-MSE C6 00pF C7 OPT L.7uH C0 OPT PCA ADDITIONAL PARTS CUSTOMER NOTICE 60 McCarthy Blvd. APPROVALS *VOUT OPERATING MODES Milpitas, CA 9505 MP STANDOFF,NYLON, SNAP-ON, 0.50" LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A SEL SEL MODE PCB DES. Phone: (08)-900 CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; NC MP STANDOFF,NYLON, SNAP-ON, 0.50" Fax: (08)-0507 HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO A A LOW LOW SHUTDOWN APP ENG. MM VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL LTC Confidential-For Customer Use Only MP STANDOFF,NYLON, SNAP-ON, 0.50" APPLICATION. COMPONENT SUBSTITUTION AND PRINTED TITLE: DEMO CIRCUIT SCHEMATIC, LOW HIGH ADJUSTABLE VOUT ** CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT MP STANDOFF,NYLON, SNAP-ON, 0.50" IC NO. PERFORMANCE OR RELIABILITY. CONTACT LINEAR WIDE RANGE BUCK-BOOST CHARGE PUMP WITH WATCHDOG TIMER HIGH LOW FIXED +5V TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. LTC6EMSE LB LABEL HIGH HIGH FIXED +.V PCB PCB, DC66A REV0 SKU NO. PCA BOM: 700-DC66A_REV0 SCHEMATIC NO. AND REVISION: **R AND R POPULATED STNCL TOOL, STENCIL, DC66A REV0 DC66A PCA ASS'Y: 705-DC66A_REV0 70-DC66A_REV0 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SIZE: N/A SCALE = NONE DATE: Tuesday, April 8, 07 SHEET OF 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 DC66A 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 00, Linear Technology Corporation 0 LT 077 PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 07