DEMO MANUAL DC2315A LTC4235-1/LTC4235-2 Dual 12V Ideal Diode-OR and Single Hot Swap Controller with Current Monitor DESCRIPTION Demonstration circuit 2315A is intended to demonstrate the performance of the LTC®4235-1/LTC4235-2 Dual 12V Ideal Diode-OR and Single Hot Swap™ Controller with Current Monitor. The controller operates in redundant 12V supply circuits, where each rail has an individual ideal diode, and the outputs are connected to the load through a single Hot Swap circuit. The controller enables monitoring of the load current by providing a signal that is 100× the sense resistor voltage. The main board components are the LTC4235 controller, two power MOSFETs functioning as ideal diodes and one power MOSFET controlled as a Hot Swap switch, two jumpers for enabling the second ideal diode (DIODE2_OFF) and Hot Swap (ON_SEL), two LEDs to indicate power good (PWRGD) and fault (FAULT) conditions, seven banana jacks for connecting power supplies and load, and many turrets and pads for observing circuit signals. The DC2315A allows verification of the LTC4235 Hot Swap and ideal diode functionality during individual rail ramp-up and ramp-down events, during power supply switchover, in steady state, and in overcurrent fault conditions. VERSION PART OVERCURRENT FAULT DC2315A-A LTC4235-1 LATCHOFF DC2315A-B LTC4235-2 RETRY The DC2315A is configured for 12V operation with a 9.0A maximum current load. PERFORMANCE SUMMARY SYMBOL Table 1. DC2315A Assembly Options Design files for this circuit board are available at http://www.linear.com/demo/DC2315A 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 14.0 V 11.1 4.3 A A Supplies VIN Input Supply Range ILIM Board Current Limit VINTVCC Internal Regulator Voltage VINTVCC(UVL) Internal VCC Undervoltage Lockout 9 OUT = 11V OUT = 0V 8 2.3 9 3.3 4.5 5 5.5 V INTVCC Rising 2.1 2.2 2.3 V 2 15 28 mV 12 14 V –90 –120 µA Ideal Diode Control ∆VFWD(REG) Forward Regulation Voltage (VINn – VSENSE+) ∆VDGATE External N-Channel Gate Drive (VDGATEn – VINn) ∆VFWD = 0.15V, I = 0, –1μA 10 ICPO(UP) CPOn Pull-Up Current CPO = IN = 12V –50 IDGATE(FPU) DGATEn Fast Pull-Up Current ∆VFWD = 0.2V, ∆VDGATE = 0V, CPO = 17V IDGATE(FPD) DGATEn Fast Pull-Down Current ∆VFWD = –0.2V, ∆VDGATE = 5V IDGATE2(DN) DGATE2 Off Pull-Down Current D2OFF = 2V, ∆VDGATE2 = 2.5V tON(DGATE) DGATEn Turn-On Delay tOFF(DGATE) DGATEn Turn-Off Delay tPLH(DGATE2) D2OFF Low to DGATE2 High –1.5 A 1.5 50 A 100 200 µA ∆VFWD =0.2V, CDGATE = 10nF 0.25 0.5 µs ∆VFWD = –0.2V, CDGATE=10nF 0.2 0.5 µs 50 100 µs dc2315af 1 DEMO MANUAL DC2315A PERFORMANCE SUMMARY SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS mV mV Hot Swap Diode Control ∆VSENSE(TH) Current Limit Sense Voltage Threshold (VSENSE+ – VSENSE–) OUT = 11V OUT = 0V 22.5 5.8 25 8.3 27.5 10.8 VSENSE+(UVL) SENSE+ Undervoltage Lockout SENSE+ Rising 1.8 1.9 2 V ∆VSENSE+(HYS) SENSE+ Undervoltage Lockout Hysteresis 10 50 90 mV ∆VHGATE External N-Channel Gate Drive (VHGATE – VOUT) I = 0, –1μA 10 12 14 V ∆VHGATE(H) External N-Channel Gate High Threshold (VHGATE – VOUT) 3.6 4.2 4.8 V IHGATE(UP) External N-Channel Gate Pull-Up Current Gate Drive On, HGATE = 0V –7 –10 –13 μA IHGATE(DN) External N-Channel Gate Pull-Down Current Gate Drive Off, OUT = 12V, HGATE = OUT + 5V 1 2 4 mA IHGATE(FPD) External N-Channel Gate Fast Pull-Down Current Fast Turn-Off, OUT = 12V, HGATE = OUT + 5V 100 200 350 mA VOUT(PGTH) OUT Power Good Threshold OUT Rising 10.2 10.5 10.8 V VON(TH) ON Pin Threshold Voltage ON Rising 1.21 1.235 1.26 V VON(RESET) ON Pin Fault Reset Threshold Voltage ON Falling 0.57 0.6 0.63 V VD2OFF(H,TH) D2OFF Pin High Threshold Voltage D2OFF Rising 1.21 1.235 1.26 V VD2OFF(L,TH) D2OFF Pin Low Threshold Voltage D2OFF Pin Failing 1.19 1.215 1.24 VFTMR(H) FTMR Pin High Threshold Voltage 1.198 1.235 1.272 V IFTMR(UP) FTMR Pull-Up Current FTMR = 1V, In Fault Mode –80 –100 –120 μA IFTMR(DN) FTMR Pull-Down Current FTMR = 2V, No Faults 1.3 2 2.7 μA DRETRY Auto-Retry Duty Cycle 0.07 0.15 0.23 % 3.6 4.1 4.6 V 99 100 15 20 Input/Output Pin Current Monitor ∆VREG Floating Regulator Voltage (VSENSE+ – VSENSE–) IREG = ±1μA VIMON(OS) IMON Input Offset Voltage ∆VSENSE = 0V GIMON IMON Voltage Gain ∆VSENSE = 20mV and 5mV VIMON(MIN) IMON Minimum Output Voltage ∆VSENSE = 200μV RIMON(OUT) IMON Output Resistance ∆VSENSE = 200μV 2 ±150 μV 101 V/V 40 mV 27 kΩ dc2315af DEMO MANUAL DC2315A OPERATING PRINCIPLES The LTC4235 is intended to build a combination of two diode-OR circuits (for two rails) and a common single Hot Swap path for inrush current limiting and overcurrent protection. Turrets The LTC4235 regulates the forward voltage drop across the ideal diode MOSFET to ensure smooth current transfer from one supply to the other without oscillation. A fast ideal diode MOSFET turn-on reduces the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse current transients. D2OFF (E20): Enable ideal diode 2. The Hot Swap fast acting current limit and internal timed circuit breaker protect circuit components when a shortcircuit fault occurs. JP1 (ON_SEL): ON control signal selection. The Hot Swap section of the LTC4235 has independent on/off control (ON pin). ON (E18): On control input. EN (E19): Enable input. PWRGD (E9): Power status output. FAULT (E10): Fault status output. CMON (E11): Current sense monitoring output. Jumpers JP2 (EN_SEL): Enable signal selection. JP3 (DIODE2_OFF): Diode 2 Off-On control. JP4 (PPRI_SEL): Prioritizer function selection. Each ideal diode MOSFET is activated from an individual charge pump source and the second ideal diode has an additional on/off control (D2OFF pin). LEDs The DC2315A-A (LTC4235-1) features a latchoff circuit breaker, while the DC2315A-B (LTC4235-2) provides automatic retry after a fault. D4: Indicates fault signal. D3: Indicates power good signal. Banana Jacks with Associated Turrets IN1 (E1, E2): First rail input. IN2 (E5, E6): Second rail input. GND (E3, E4, E7, E8, E14, E15, E21, E22): Power and control ground. SENSE+ (E16, E17): SENSE+ power node. OUT (E12, E13): Circuit output for load connection. dc2315af 3 DEMO MANUAL DC2315A QUICK START PROCEDURE Demonstration circuit 2315A is easy to set up to evaluate the performance of the LTC4235. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below. The DC2315A test includes independent test of the LTC4235 Hot Swap functionality and ideal diode functionality. HOT SWAP FUNCTIONALITY TEST This test is performed with a single rail operation when the output is provided through two series connected MOSFETs. One MOSFET functions as an ideal diode and the other as a Hot Swap circuit switch. The parameters of the three different transients completely characterize the Hot Swap circuit performance. These transients are: n A Power-Up Without Any Additional Load n A Current Limit Operation After Successful Power-Up n A Power-Up With Shorted Output 1.Initially, install the jumpers in the following positions, if the first ideal diode is used in the test: JP1: ON_SEL in the position OFF JP2: EN_SEL in the position EN JP3: DIODE2_OFF in the position OFF_EXT If the second ideal diode is used: JP1: ON_SEL in the position OFF JP2: EN_SEL in the position EN JP3: DIODE2_OFF in the position ON Connect a +12V power supply to turrets IN1 and GND. Do not load the output. Place the current probe on the +12V wire, voltage probes on the OUT turret and a voltmeter on the CMON and GND turrets. 4 Provide an ON signal at the ON pin by changing the JP1 header position from the OFF position to 12V. Observe the transient. The output voltage rise time should be in the range of 8.9ms – 19.7ms. The PWRGD green LED D3 must light. The voltmeter at the CMON turret should display an absolute value not larger than 15mV. Turn off the rail using the ON_SEL jumper. 2.Connect a disabled electronic load to the OUT turret and GND. Turn on the rail and slowly increase the load current up to the circuit breaker threshold level. The current limit range should be from 8.0A to 11.1A. The voltage at the CMON turret should be in the range from 2.22V to 2.77V. Turn off the rail with the ON_SEL jumper. 3.Initially short the output with an external wire. Place the current probe on this wire. Turn on the rail and record the current shape. The maximum current should be in the 2.3A to 4.3A range, and the voltage at the CMON turret should be in the range from 0.57V to 1.09V. IDEAL DIODE FUNCTIONALITY TEST In this test, both ideal diodes are active and small variations in the input voltage forces one ideal diode to be off and the other ideal diode to be on. Connect input turrets (IN1 and IN2) of each ideal diode with independent lab supplies. Adjust each input voltage to +12V with maximum possible accuracy. Place one voltmeter between IN1 and IN2 turrets to measure the difference between the two input voltages. Connect an electronic load to the output turret. Activate both rail and keep a load around 9A. Play with the input voltage levels and check that when the difference between input voltages exceeds 28mV, only one rail feeds the load. dc2315af DEMO MANUAL DC2315A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup dc2315af 5 DEMO MANUAL DC2315A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 8 C1, C2, C6, C7, C8, C9, C13, C14 CAP., 0.1μF, X7R, 50V, 10%, 0603 TDK, C1608X7R1H104K 2 0 C3, C4 CAP., 100μF, ALUM. ELECT., 50V, 20%, SMT (OPTIONAL) SUNCON, 50CE100BS 3 1 C5 CAP., 100μF, ALUM. ELECT., 50V, 20%, SMT 4 1 C10 CAP., 0.01μF, X7R, 50V, 10%, 0603 AVX, 06035C103KAT2A 5 2 C11, C15 CAP., 0.1μF, X7R, 16V,10%, 0603 AVX, 0603YC104KAT2A 6 1 C12 CAP., 0.47μF, X7R, 16V, 10%, 0603 TDK, C1608X7R1C474K SUNCON, 50CE100BS 7 2 D1,D2 DIODE, TVS, 17V, SMA DIODES INC., SMAJ17A-13-F 8 1 D3 LED,GREEN, WATERCLEAR, 3×2mm ROHM, SML-010FTT86 9 1 D4 LED,RED, WATERCLEAR, 3×2mm ROHM, SML-010VTT86 10 7 E1, E3, E5, E7, E12, E14, E16 BANANA JACK, NON-INSULATED KEYSTONE, 575-4 11 8 E2, E4, E6, E8, E13, E15, E17, E21 TEST POINT, TURRET, 0.094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0 12 7 E9, E10, E11, E18, E19, E20, E22 TEST POINT, TURRET, 0.064" MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0 13 2 JP1, JP4 CONN,, HEADER, 2×2, 2mm, THRU-HOLE, VERTICAL SAMTEC, TMM-102-02-L-D 14 2 JP2, JP3 CONN., HEADER, 1×3, 2mm, THRU-HOLE, VERTICAL SAMTEC, TMM-103-02-L-S 15 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON) 16 3 Q1, Q2, Q3 MOSFET, N-CH 30V 60A METAL OXIDE, PPAK VISHAY, SIR158DP-T1-GE3 17 1 RS1 RES., 0.0025Ω, METAL ELEMENT, 1%, 1/2W 2010 VISHAY, WSL20102L500FEA 18 2 R1, R2 RES., 100Ω, 1/10W, 1%, 0603 YAGEO, RC0603FR-07100RL 19 2 R3, R9 RES., 1k, 1/10W, 1%, 0603 YAGEO, RC0603JR-071KL 20 1 R4 RES., 10Ω, 1/10W, 1%, 0603 YAGEO, RC0603FR-0710RL 21 1 R5 RES., 2k, 1/10W, 1%, 0603 YAGEO, RC0603FR-072KL 22 1 R6 RES., 13.7k, 1/10W, 1%, 0603 YAGEO, RC0603FR-0713K7L 23 2 R7, R8 RES., 3.0k, 1/8W, 1%, 0805 VISHAY, CRCW08053K00FKEA 24 1 R10 RES., 2.49k, 1/10W, 1%, 0603 YAGEO, RC0603FR-072K49L 25 1 R11 RES., 21k, 1/10W, 1%, 0603 VISHAY, CRCW060321K0FKEA 26 4 XJP1, XJP2, XJP3, XJP4 SHUNT, 2mm SAMTEC, 2SN-BK-G 1 U1 IC, IDEAL DIODE & Hot Swap CONTROLLER, QFN LINEAR TECH., LTC4235IUFD-1 1 U1 IC, IDEAL DIODE & Hot Swap CONTROLLER, QFN LINEAR TECH., LTC4235IUFD-2 DC2315A-A 1 DC2315A-B 1 6 dc2315af 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 D2OFF IN1 EN ON GND GND IN2 IN2 SENSE+ SENSE+ IN1 E1 1 3 4 3 E20 2 1 5 NC VIN1 JP1 4 R10 2.49k R11 21k OFF 12V C4 100uF 50V OPT 2 + ON_SEL PPRI_SEL JP4 E19 E18 SENSE+ E8 E7 E6 9V-14V E5 E17 E16 E2 9V-14V 2 1 1 2 C14 0.1uF 50V 1 3 2 C2 0.1uF 50V R5 2k EN_SEL DIS_EXT EN JP2 R6 13.7k D2 SMAJ17A R2 100 INTVCC 4 C6 0.1uF 50V C13 0.1uF 50V TP9 CPO1 TP2 C7 0.1uF 50V IN1 10 5 21 14 4 EN GND EP ON INTVcc TP3 C8 0.1uF 50V DG1 TP1 5 Q1 SiR158DP 4 2 1 1 2 IN1 3 2 1 19 CPO1 R1 100 3 IN1 D CPO2 1 3 2 3 2 1 OFF_EXT ON GND PROBE GND U1 * C9 0.1uF 50V TP5 DG2 5 TP4 Q2 SiR158DP LTC4235-1 DIODE2_OFF JP3 6 IN2 C1 0.1uF 50V 8 CPO2 D1 SMAJ17A 7 DGATE2 4 12 REG C3 100uF 50V OPT SENSE+ E22 E21 3 REG 1 SENSE- E4 2 SENSE+ GND C11 0.1uF 16V TP7 C15 0.1uF 16V FTMR HG TP6 TP8 IMON C10 0.01uF 50V R3 1k R4 10 CUSTOMER NOTICE 11 9 15 5 3 2 1 Q3 SiR158DP R9 1k GREEN D3 R7 3.0k 0805 APPROVALS 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. E11 E10 E9 STANDOFF, NYLON 0.5" STANDOFF, NYLON 0.5" MP3 MP4 STANDOFF, NYLON 0.5" PCB1 PCB FAB, DC2315A REV01 STANDOFF, NYLON 0.5" MP2 PCA ADDITIONAL PARTS MP1 SIZE: N/A SCALE = NONE Friday, September 11, 2015 1 SHEET 1 OF 710-DC2315A_REV01 SCHEMATIC NO. AND REVISION: 1 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: DEMO CIRCUIT SCHEMATIC, CMON FAULT PWRGD LTC4235-2 DC2315A-B U1 LTC4235-1 SKU# DC2315A-A DATE: 2 GND GND USE TABLE BELOW FOR ALTERNATE U1. DC2315A-A SKU NO. E15 E14 OUT ADJ., 9A OUT DUAL IDEAL DIODE AND SINGLE HOT SWAP CONTROLLER WITH CURRENT MONITOR C12 0.47uF 16V RED D4 R8 3.0k 0805 SENSE+ C5 100uF 50V E13 E12 1 SCHEMATIC DEPICTS U1 USED ON SKU# DC2315A-A. * + PCA BOM: 700-DC2315A-A_REV02 PCA ASS'Y: 705-DC2315A_REV01 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A PCB DES. M.HAWKINS CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO APP ENG. V.OSTREROV VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT IC NO. PERFORMANCE OR RELIABILITY. CONTACT LINEAR LTC4235-1 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. IMON FTMR FAULT PWRGD 16 RS1 0.0025 17 OUT E3 18 HGATE 4 3 2 1 GND 4 20 DGATE1 D2OFF 13 2 1 1 2 + 5 A B C D DEMO MANUAL DC2315A SCHEMATIC DIAGRAM dc2315af 7 DEMO MANUAL DC2315A 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 8 dc2315af Linear Technology Corporation LT 0915 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015