DEMO MANUAL DC1052A LTC4218 Hot Swap Controller Description Demonstration circuit DC1052A includes two separate circuits for performance evaluation of the LTC®4218 Hot Swap™ controller. The standard version of the controller (LTC4218) is intended to operate with 2.9V to 26.5V rails, while the LTC4218-12 has internal adjustment for 12V applications. One circuit of DC1052A located on the upper board area is assembled with the LTC4218 configured for operation with a 24V rail. The circuit on the lower board area includes the LTC4218-12. Circuit breaker thresholds in both cases are adjusted to 7.5A. The LTC4218 features accurate current limiting with foldback and a ground-referred current monitor. The current monitor sources a current that is proportional to the sense Performance Summary SYMBOL voltage, and it may be converted into a voltage signal with an appropriate resistor. The current limit may be reduced by placing an external resistor between GND and the ISET pin. The LTC4218 protects the load from overvoltage and undervoltage conditions. The DC1052A schematic allows the LTC4218 to operate in turn-on and turn-off modes as well as in the steady-state mode with different loads, and in the fault state. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C PARAMETER CONDITIONS MIN TYP MAX UNITS VDD Input Supply Range Typical Value 19.89 24 26.34 V VDD(UVL) Input Supply Undervoltage Range VDD Rising 19.32 19.89 20.68 V VDD(OVH) Input Supply Overvoltage Range VDD Rising 25.56 26.34 27.39 V VOUT(PG) Output Voltage Defined as Power Good VSOURCE Rising 20.00 20.75 21.57 V 0.9 1.235 1.76 ms 7.05 1.38 7.5 1.88 7.95 2.37 A A 24V Circuit tTIMER Timer Period ILIMIT Current Limit VFB = 1.23V (VOUT in the Range 20.33V to 21.16V) VFB = 0V to 0.15V (VOUT in the Range 0V to 2.6V) CMAX24 Maximal Load Capacitance Successful Power-Up Mode 600 μF CMIN24 Minimal Load Capacitance Unsuccessful Power-Up Mode 1800 μF VDD Input Supply Range Typical Value 9.88 12 15.05 V VDD(UVL) Input Supply Undervoltage Range VDD Rising 9.6 9.88 10.2 V 12V Circuit VDD(OVH) Input Supply Overvoltage Range VDD Rising 14.7 15.05 15.4 V VOUT(PG) Output Voltage Defined as Power Good VSOURCE Rising 10.2 10.5 10.8 V 0.9 1.235 1.76 ms 7.05 1.38 7.5 1.88 7.95 2.37 A A tTIMER Timer Period ILIMIT Current Limit VFB = 1.23V (VOUT in the Range 10.3V to 10.4V) VFB = 0V to 0.15V (VOUT in the Range 0V to 1.27V) CMAX12 Maximal Load Capacitance Successful Power-Up Mode 900 μF CMIN12 Minimal Load Capacitance Unsuccessful Power-Up Mode 1800 μF dc1052af 1 DEMO MANUAL DC1052A Operating Principles The LTC4218 is suited for low voltage power control in applications for hot board insertion or removal with electronic circuit breaker function, foldback current limit and load current monitoring. The LTC4218 has a rich set of features to support Hot Swap applications, including: • Adjustable inrush current control • 2% accurate undervoltage and overvoltage protection • Power good and fault signaling • Load current monitoring • Adjustable current limit timer before power is turned off • Adjustable 5% accurate current limit Quick Start Procedure Demonstration circuit 1052A is easy to set up to evaluate the performance of the LTC4218 and LTC4218-12. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below. For the 12V circuit: JP3 FAULT Signal For the 24V circuit: JP4 AUX_UV ON 1. Place jumpers in the following positions: 7. With power off, connect the 12V power supply terminals to the 12VIN (E9) and GND (E12) turrets. JP1 FAULT Signal JP2 AUX_UV ON 2. With power off, connect the 24V power supply terminals to the 24VIN (E1) and GND (E4) turrets. 3. Turn on the 24V supply and verify the output voltage between the VOUT (E2) and GND (E3) turrets. Green LEDs 24VIN (D2) and VOUT (D4) should light up. 4. Check the current limit by providing an electronic or resistive load. It should be in the range of 7.05A to 7.95A. During this measurement, verify the current monitor performance. The monitor signal related to the current limit level should be 2.0V ± 0.17V. The monitor signal has a 3.75A/V scale. 5. Use an oscilloscope to check the output voltage slew rate without a load connected. It should be in the range of 1680V/s to 2300V/s. Use an 1800μF capacitive load to confirm that during power-up, the timer period expires and a current limit fault is indicated by the FAULT red LED (D5). The PG red LED (D6) indicates that the output voltage is lower than the power good level. 6. Place jumpers in the following positions: 8. Turn on the 12V supply and verify the output voltage at the VOUT (E10) and GND (E11) turrets. Green LEDs 12VIN (D9) and VOUT (D11) should light up. 9. Check the current limit by providing an electronic or resistive load. It should be in the range of 7.05A to 7.95A. During this measurement verify the current monitor performance. The monitor signal related to the current limit level should be 2.0V ± 0.17V. The monitor signal has a 3.75A/V scale. 10.Check the output voltage slew rate with an oscilloscope without a load connected. It should be in the range of 1680V/s to 2300V/s. 11. Use an 1800µF capacitive load to confirm that during power-up the timer period expires and a current limit fault is indicated by the FAULT red LED (D12) accompanied by the PG red LED (D13) to indicate that the output voltage is lower than the power good level. dc1052af 2 DEMO MANUAL DC1052A Quick Start Procedure Figure 1. Proper Measurement Equipment Setup dc1052af 3 DEMO MANUAL DC1052A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 4 C1, C2, C4, C6 CAP., CER X7R 0.1µF 16V 0603 AVX 0603YC104KAT2A 2 2 C3, C5 CAP., CER X7R 0.01µF 50V 0603 AVX 06035C103KAT2A 3 0 COUT1, COUT2 OPTIONAL 4 0 CIN1, CIN2 OPTIONAL 5 8 E5-E8, E13-E16 TURRET, TEST PIN, .061" MILL-MAX 2308-2-00-44 6 8 E1-E4, E9-E12 TURRET, TEST PIN, .095" MILL-MAX 2501-2 7 4 JP1-JP4 JUMPER, 0.079, 3 PIN SAMTEC, TMM-103-02-L-S 8 4 JP1-JP4 SHUNT, SAMTEC, 2SN-BK-G 9 4 D5, D6, D12, D13 LED, SMT RED PANASONIC, LN1251C 10 4 D2, D4, D9, D11 LED, SMT GREEN PANASONIC, LN1351C 11 1 D1 DIODE, 600W TRANSIENT VOLTAGE SUPPRESSOR DIODES INC., SMBJ24A 12 1 D8 DIODE, 600W TRANSIENT VOLTAGE SUPPRESSOR DIODES INC., SMBJ12A 13 0 D3, D10, D17, D14 OPTIONAL SMA 14 2 Q1, Q2 MOSFET N-CHANNEL 30V, POWER PAK-SO-8 VISHAY, Si7880ADP 15 2 R1, R13 RES., CHIP, 0.002Ω 1/4W 1% 1206 VISHAY, WSL12062L000FEA 16 2 R8, R18 RES., CHIP, 10Ω 1/16W 5% 0603 VISHAY, CRCW060310R0JNEA 17 2 R11, R19 RES., CHIP, 1k 1/16W 5% 0603 VISHAY, CRCW06031K00JNEA 18 1 R10 RES., CHIP, 3.24k 1/16W 1% 0603 Vishay, CRCW06033K24FKEA 19 4 R14-R17 RES., CHIP, 3.30k 1/16W 5% 0603 VISHAY, CRCW06033K30JNEA 20 4 R2, R4, R5, R6 RES., CHIP, 6.80k 1/4W 5% 1206 VISHAY, CRCW12066K80JNEA 21 2 R9, R12 RES., CHIP, 10k 1/16W 1% 0603 VISHAY, CRCW060310K0FKEA 22 2 RMON1, RMON2 RES., CHIP, 20k 1/16W 5% 0805 VISHAY, CRCW080520K0JNEA 23 1 R7 RES., CHIP, 158k 1/16W 1% 0603 VISHAY, CRCW0603158KFKEA 24 1 R3 RES., CHIP, 200k 1/16W 1% 0603 VISHAY, CRCW0603200KFKEA 25 0 RSET1, RSET2 OPTIONAL 26 1 U1 IC., HOT SWAP CONTROLLER LINEAR, LTC4218CGN 27 1 U2 IC., HOT SWAP CONTROLLER LINEAR, LTC4218CDHC-12 dc1052af 4 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. D C B GND 1 2 E9 E4 1 2 2 Future Use DC1052A-B 1 U1 LTC4218CGN DC1052A-A + CIN2 (Opt.) JP2 D9 LED (GRN) R14 3.3K OFF ON 1 2 3 + CIN1 (Opt.) AUX_UV D2 LED (GRN) R2 6.8K 1206 ASSEMBLY Table E12 D8 SMBJ12A 12VIN GND D1 SMBJ24A 1 2 C2 0.1uF 16V C1 0.1uF 16V 8 7 6 5 4 3 2 1 GATE PG FAULT FB IMON ISET SENSE- SENSE+ SOURCE GND INTVCC TIMER OV UV VDD NC U1 LTC4218CGN 9 10 11 12 13 14 15 16 8 7 6 5 4 GATE PG FAULT FB IMON ISET SENSE- SENSE+ SOURCE GND INTVCC TIMER OV UV VDD NC 9 10 11 12 13 14 15 16 Future Use LTC4218CDHC-12 U2 3 POSITIVE 12V HOT SWAP C6 0.1uF 16V C4 0.1uF 16V 3 2 1 U2 LTC4218CDHC-12 R13 .002 POSITIVE 24V HOT SWAP R12 10K 1% R10 3.24K 1% R3 200K 1% 4 RMON2 20K 1% RSET2 (Opt.) RMON1 20K 1% RSET1 (Opt.) 1 3 2 1 3 2 1 JP1 JP3 8 7 6 5 R18 10 R8 10 1 JP4 ON AUX_UV 3 OFF 2 D13 LED (RED) PG R17 3.3K D6 LED (RED) PG R6 6.8K 1206 8 7 6 5 3 2 1 3 2 1 6 D14 (Opt.) 5 6 E8 E7 E6 E5 C3 0.01uF R11 1K D3 (Opt.) COUT1 (Opt.) D10 (Opt.) COUT2 (Opt.) ISET IMON PG FAULT Output ISET IMON PG FAULT Output R9 10K 1% R7 158K 1% 7 E2 GND 24V/7.5A VOUT E10 E11 D11 LED (GRN) R15 3.3K 7 Tuesday, February 05, 2008 1 Demo Circuit 1052A-A/B LTC4218CGN, LTC4218CDHC-12 Positive 24V, Positive 12V Hot Swap 1630 McCARTHY BLVD. MILPITAS, CA. 95035 PHONE (408) 954-8400 FAX (408) 434-0507 8 1 GND 12V/7.5A VOUT SUM110MO3-03P Alternate Part For Q1 E3 D4 LED (GRN) R4 6.8K 1206 8 LINEAR TECHNOLOGY CORPORATION E16 E15 E14 E13 C5 0.01uF R19 1K Q2 Si7880ADP Linear Technology Has Made A Best Effort To Design A Circuit That Meets Customer-Supplied Specifications; However, It Remains The Customer's Responsibility To Verify Proper And Reliable Operation In The Actual Application. Component Substitution And Printed Circuit Board Layout May Significantly Affect Circuit Performance Or Reliability. Contact Linear Technology Applications Engineering For Assistance. This Circuit Is Proprietary To Linear Technology And Supplied For Use With Linear Technology Parts. Customer Notice D7 (Opt.) Q1 Si7880ADP LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY Auto-Retry Signal FAULT 5 Auto-Retry Signal FAULT FAULT D5 LED (RED) R5 6.8K 1206 D12 LED (RED) FAULT R16 3.3K 2 A 1 2 1 2 E1 R1 .002 4 1 2 4 4 3 1 2 2 1 1 2 24VIN 2 2 1 1 2 1 2 1 2 1 D C B A DEMO MANUAL DC1052A Schematic Diagram dc1052af 5 DEMO MANUAL DC1052A 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 30 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 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc1052af 6 Linear Technology Corporation LT 0513 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013