DEMO MANUAL DC2116A LTC4233/LTC4234 10A/20A Guaranteed SOA Hot Swap Controller Description Demonstration circuit 2116A features the LTC4233/ LTC®4234 10A/20A Guaranteed SOA Hot Swap™ Controllers. The LTC4233 and LTC4234 are ideally suited for compact power distribution control in 2.9V to 15V applications for hot board insertion protection, high side power switching, and electronic circuit breaker functions. They provide a rich set of features to support Hot Swap applications including: • 2.5% Accurate Undervoltage and Overvoltage Protection • Overtemperature Protection • Configurable for Auto Retry or Latch Off for Overcurrent Faults • Power Good and Fault Outputs Available in 38-pin 5mm × 9mm QFN packages, the LTC4234 is showcased on DC2116A-A while the LTC4233 is showcased on DC2116A-B, both configured for a 12V application. By changing a few passive components, 2.9V to 15V applications can easily be evaluated. Design files for this circuit board are available at http://www.linear.com/demo/DC2116A • Adjustable Inrush Current Control • Adjustable, 11% Accurate Current Limit 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. • Adjustable Output Voltage Ramp Rate Performance Summary PARAMETER Specifications are at TA = 25°C CONDITIONS Input Supply Voltage Range VALUE 2.9V to 15V Nominal Operating Voltage 12.0V Overvoltage Lockout Nominal 15.2V Undervoltage Lockout (Voltage Falling) Nominal 9.2V Undervoltage Lockout (Voltage Rising) Nominal 9.9V Output Current Limit Nominal (LTC4233) 11.2A Nominal (LTC4234) 22.5A Maximum Load Capacitance Nominal 8200µF Timer Expiration Period Nominal 1.2ms or 2.0ms dc2116afa 1 DEMO MANUAL DC2116A Quick Start Procedure Table 1. Power Input and Output Connections NOMENCLATURE CONNECTOR DESCRIPTION VDD E13 12V In GND E14 12V In Return VOUT E6 12V Out GND E7 12V Out Return NOMENCLATURE TURRET DESCRIPTION INTVCC E1 INTVCC monitor TIMER E2 TIMER pin monitor PG E3 PG pin monitor ISET E4 ISET pin monitor IMON E5 IMON pin monitor GND E8 VOUT return monitor VOUT E9 VOUT monitor UV E10 UV pin monitor OV E11 OV pin monitor VDD E12 VDD monitor GND E15 VDD return monitor SENSE E16 SENSE pin monitor FLT E17 FLT pin monitor GATE E18 GATE pin monitor GND E19, E20, E21 Ground NOMENCLATURE PART DESIGNATOR DESCRIPTION FAULT D1 (Red) Indicates Overcurrent Fault POWER BAD D2 (Red) VOUT Not Up to Full Voltage INPUT POWER D3 (Green) Input Voltage Present OUTPUT POWER D4 (Green) Output Voltage Present Table 2. Test Points Table 3. LED Indicators Table 4. Jumpers NOMENCLATURE PART DESIGNATOR DESCRIPTION AUTORETRY JP1 ON Position for Autoretry TIMER DURATION JP2 1.2ms or 2.0ms Timer Duration 2 dc2116afa DEMO MANUAL DC2116A DC2116A-A Quick Start Procedure DC2116A-A is easy to set up to evaluate the performance of the LTC4234. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below. Set an adjustable power supply, capable of supplying 30 amps, at 16V. Turn off power and connect the supply to the VDD and GND banana jacks. DC2116A has two user configurable jumper options: Connect a suitable load to the VOUT and GND banana jacks. This load can be an electronic load or power resistors capable of dissipating 300W. • JP1 AUTORETRY – Set to ON for auto retry or OFF for latch off on over-current faults. (Default position: OFF) • JP2 TIMER DURATION – Set to 2ms for the internal 2ms timer or 1.2ms determined by C2, C2 may be replaced for other timer durations. (Default position: 1.2ms) LEDs indicate the state of input power (D2), output power (D4), FAULT (D3) and PG (D1). Load current can be monitored on the IMON turret, which has a value of 0.1V/A determined by RMON (20k.) NOTE: Because the LTC4234 incorporates foldback current limiting, the nominal startup current supplied to the load is approximately 5.7A, and may be as low as 4A. This current limit increases linearly until the FB pin exceeds 0.6V (VOUT > 5.1V). An electronic constant current load set to ≤ 20 amps will not permit the circuit to turn on unless it is gated on by the PG signal (as would be the case with a DC/DC converter controlled by the PG signal). Resistive loading will not have this problem. + ADJUSTABLE POWER SUPPLY + + – – – TEST LOADS DC2116 F01 Figure 1. Proper Measurement Equipment Setup dc2116afa 3 DEMO MANUAL DC2116A dc2116a-a Quick Start Procedure Turn on the power supply; verify the input voltage is 12V. Verify the output voltage and the load current; D3 and D4 should both be illuminated (input voltage and output voltage, respectively) and both D1 (FLT) and D2 (PG) should be off. On power-up, observe the slope of VOUT. This should be in the range of 0.15 to 0.55V/ms, corresponding to a ramp-up time of 22ms to 80ms to 12V. With the circuit functioning, additional evaluations can now be performed. OV/UV/PG thresholds – Set the input supply to zero and ramp the voltage slowly, observing the following events. Above 10.0V, the circuit will be out of UV lockout and the output should ramp up, lighting D4. Above 10.9V the FB pin will be past its threshold, asserting the PG pin high and extinguishing D2. Increasing the supply past 15.2V will engage OV lockout; D4 will extinguish and D2 will light. Note that the voltages indicated in this step are maximums, taking into consideration the tolerances of the resistors and the LTC4234 thresholds. Current Limit Thresholds – With the input supply set to 12V, load the output with a 0.59Ω power resistor capable of dissipating 300W. Power should remain on, as the current will be below the 20A minimum current limit threshold. Next, load the output with a 0.48Ω power resistor. Power should be interrupted, as the current will be above the 25A maximum current limit threshold. Inrush into capacitive load – One of the main functions of a Hot Swap circuit is to provide controlled ramp-up into a capacitive load to avoid disturbing the input power supply. For the following tests, ensure that the AUTORETRY jumper is set to OFF and the TIMER DURATION jumper is set to 2.0ms. To guarantee that current limit is never reached during ramp-up into a capacitor, the current must be less than the minimum current limit threshold of 4A when the gate ramp rate is at its maximum value of 0.6V/ ms. (Note that the minimum current limit threshold occurs when the FB pin is at 0V.) C = i/(dV/dt) = 4A/(0.6V/ms) = 6667µF Thus the circuit will always power up successfully with a 6000µF capacitor at VOUT, and observation of the TIMER turret post will show that it never begins to ramp. DC2116A-B Quick Start Procedure The LTC4233, on the DC2116A-B, should be tested as above with actual values scaled to values shown in the data sheet. 4 dc2116afa 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. A B C D INPUT P0WER OFF ON CIN OPT D3 GREEN + -B ASS'Y -A 2 ms 1.2 ms 20A LTC4234 10A CURRENT U1 LTC4233 5 1 R1 10K 5% 0805 3 2 5 4 36 31 34 2 1 39 33 6 E16 SENSE C1 1.0uF 16V CUSTOMER NOTICE R9 20K R8 226K C2 0.1uF 16V R10 20K R7 140K VDD INTVCC TIMER FLT SENSE SENSE- OV UV VDD VDD VDD U1* 4 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE APPROVALS E19 GND I MON I SET PG GATE FB OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. M.HAWKINS VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. R. SMITH CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. JP2 TIMER DURATION 3 2 1 FAULT D1 RED R4 10K 5% 0805 AUTORETRY JP1 * ASSEMBLY OPTIONS E21 E20 E1 E2 E17 E11 E10 E15 GND D5 SMAJ22A 1. ALL RESISTORS ARE 0603 PACKAGE, 1% U.O.N. NOTE: GND GND INTVCC TIMER FLT OV UV BANANA GND E14 BANANA VDD E13 1 2 E12 2 1 2 1 VDD 3 3 RMON 20K 0805 DATE: N/A SIZE GATE 05/21/2013 1 SHEET DEMO CIRCUIT 2116A IC NO.LTC4233/LTC4234 2 IMON ISET PG E7 VOUT GND BANANA BANANA 1 1 OF 1 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E5 E4 E3 E8 OPT E6 + COUT2 GND POWER BAD R6 10K 5% 0805 COUT1 22uF 25V E9 DATE 05/21/2013 10/20 AMP INTEGRATED HOT SWAP CONTROLLER TECHNOLOGY RSET OPT 0805 E18 OPT CGATE OPT D2 RED OUTPUT P0WER + VOUT APPROVED ROBERT SMITH PRODUCTION 1 DESCRIPTION REVISION HISTORY D4 GREEN R5 10K 5% 0805 RGATE R3 20K R2 150K VOUT 1 REV TITLE: SCHEMATIC 38 35 32 37 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 - ECO 2 2 1 4 SENSE 8 SENSE 40 GND 7 2 1 5 A B C D DEMO MANUAL DC2116A Schematic Diagram dc2116afa 5 DEMO MANUAL DC2116A 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 6 dc2116afa Linear Technology Corporation LT 0815 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015