DEMO MANUAL DC2314A LTC4236-1/LTC4236-2 Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor DESCRIPTION Demonstration circuit 2314A is intended to demonstrate the performance of the LTC4236-1/LTC4236-2 Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor. The controller operates in redundant 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 LTC4236 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 and Hot Swap, four LEDs to indicate the power good state, fault condition, and the state of the MOSFETs operating as ideal diodes, seven banana jacks for connecting power supplies and loads, and many turrets and pads for observing circuit signals. The DC2314A allows verification of the LTC4236 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 DC2314A-A LTC4236-1 LATCHOFF DC2314A-B LTC4236-2 RETRY The DC2314A is configured for 12V operation with a 10A current load. Table 1. DC2314A Assembly Options Design files for this circuit board are available at http://www.linear.com/demo/DC2314A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. BOARD AND CONTROLLER PERFORMANCE SUMMARY Specifications are at TA = 25°C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS OUT = 11V 18.0 V 8.91 10 11.11 A 4.5 5 5.5 V INTVCC Rising 2.1 2.2 2.3 V Supplies VIN Input Supply Range ILIM Board Current Limit VINTVCC Internal Regulator Voltage VINTVCC(UVL) Internal VCC Undervoltage Lockout 2.9 Ideal Diode Control ΔVFWD(REG) Forward Regulation Voltage (VINN – VSENSE) 2 15 28 mV ΔVDGATE External N-Channel Gate Drive (VDGATE1 – VIN1) and (VDGATE2 – VD2SRC) IN < 7V, ΔVFWD = 0.15V; I = 0, –1µA IN = 7V to 18V, ΔVFWD = 0.15V; I = 0, –1μA 5 10 7 12 14 14 V V ICPO(UP) CPOn Pull-Up Current CPO = IN = D2SRC = 2.9V CPO = IN = D2SRC = 18V –60 –50 –100 –90 –130 –120 µA µA IDGATE(FPU) DGATEn Fast Pull-Up Current ΔVFWD = 0.2V, ΔVDGATE = 0V, CPO = 17V –1.5 A IDGATE(FPD) DGATEn Fast Pull-Down Current ΔVFWD = –0.2V, ΔVDGATE = 5V 1.5 A IDGATE2(DN) DGATE2 Off Pull-Down Current D2OFF = 2V, ΔVDGATE2 = 2.5V tON(DGATE) DGATEn Turn-On Delay tOFF(DGATE) DGATEn Turn-Off Delay tPLH(DGATE2) D2OFF Low to DGATE2 High 50 100 200 µA ΔVFWD = 0.2V, CDGATE = 10nF 0.25 0.5 µs ΔVFWD = –0.2V, CDGATE = 10nF 0.2 0.5 µs 50 100 µs dc2314af 1 DEMO MANUAL DC2314A BOARD AND CONTROLLER PERFORMANCE SUMMARY Specifications are at TA = 25°C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 27.5 10.8 mV mV Hot Swap Diode Control ΔVSENSE(TH) Current Limit Sense Voltage Threshold (VSENSE+ – VSENSE–) FB = 1.3V FB = 0V 22.5 5.8 25 8.3 VSENSE+(UVL) SENSE+ Undervoltage Lockout SENSE+ Rising 1.8 1.9 2 V ΔVSENSE+(HYS) SENSE+ Undervoltage Lockout Hysteresis 10 50 90 mV ΔVHGATE External N-Channel Gate Drive (VHGATE – VOUT) IN < 7V, I = 0, –1μA IN = 7V to 18V, I = 0, –1μA 5 10 7 12 14 14 V V ΔVHGATE(H) 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 VIN(TH) ON, FB Pin Threshold Voltage Voltage 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 D2OFF Rising 1.21 1.235 1.26 V VTMR(H) FTMR, DTMR Pin High Threshold 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 100 101 V/V 5.5 2.9 V V 27 kΩ Input/Output Pin Current Monitor GIMON IMON Voltage Gain ΔVSENSE = 20mV and 5mV 99 VIMON(MAX) IMON Maximum Output Voltage ΔVSENSE = 70mV, 5V ≤ SENSE+ ≤ 18V ΔVSENSE = 35mV, SENSE+ = 2.9V 3.5 2.7 RIMON(OUT) IMON Output Resistance ΔVSENSE = 200μV 15 2 20 dc2314af DEMO MANUAL DC2314A OPERATING PRINCIPLES The LTC4236 is intended to build a combination of a diodeOR circuit for two rails and a common single Hot Swap path for inrush current limiting and overcurrent protection. The LTC4236 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. The Hot Swap fast acting current limit and internal timed circuit breaker protect circuit components when a shortcircuit fault occurs. The Hot Swap section of the LTC4236 has independent on/off control (ON pin). Each ideal diode MOSFET is activated from an individual charge pump source, and the second one has an additional on/off control (D2OFF pin). The LTC4236 features an adjustable debounce time — the delay time between events when the controller is enabled and when it starts up. The DC2314A-A (LTC4236-1) circuit features a latchoff circuit breaker, and DC2314A-B (LTC4236-2) provides automatic retry after a fault. dc2314af 3 DEMO MANUAL DC2314A 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, E26): SENSE+ power node. OUT (E12, E13): Circuit output for load connection. TURRETS ON (E18): Hot Swap ON control input. EN (E19): Enable input. D2OFF (E20): Enable ideal diode 2. PWRGD (E9): Power status output. FAULT (E10): Fault status output. CMON (E11): Current sense monitoring output. JUMPERS JP1 (ON_SEL): Hot Swap ON control signal selection. JP2 (EN_SEL): ENABLE signal selection. JP3 (DIODE2_OFF): Diode 2 OFF-ON control. JP4 (PPRI_SEL): Prioritizer function selection. JP5 (FB_SEL): Foldback circuit selection. JP6 (DEBOUNCE): Debounce time selection. JP8 (DSTAT2_SEL): DSTAT2 pin functionality selection. JP9 (D2OFF_SEL): D2OFF control in the prioritizer mode. LEDS D3: Indicates PWRGD pin signal. D4: Indicates FAULT pin signal. D5: Indicates DSTAT1 pin signal. D6: Indicates DSTAT2 pin signal. 4 dc2314af DEMO MANUAL DC2314A QUICK START PROCEDURE Demonstration circuit 2314A is easy to set up to evaluate LTC4236. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: The DC2314A test includes independent test of the LTC4236 Hot Swap functionality and ideal diode functionality. HOT SWAP FUNCTIONALITY TEST This test is performed with singe rail operation when the output is provided through two series connected MOSFETs. One MOSFET functions as an ideal diode and the other one as a Hot Swap circuit switch. The parameters of four different transients completely characterize the Hot Swap circuit performance. These transients are: A Power-Up Without Any Additional Load A Current Limit Operation After Successful Power-Up A Power-Up With Shorted Output A Power-Up With Pure Capacitive Load For Confirming Foldback Current Limiting 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 (or IN2) 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. 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 8.3ms – 19.7ms. The PWRGD green LED D3 must light up. 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 8.91A to 11.11A. The voltage at the CMON turret should be in the range from 2.18V to 2.83V. 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 2.30A to 4.36A range, and the voltage at the CMON turret should be in the range from 0.57V to 1.09V. 4. With no rail voltages and JP1 in the OFF position, connect a 1000μF capacitor to the board output. Place a scope current probe on any wire between the board and the 1000μF capacitor, and a voltage probe at the output. Provide +12V to any input (IN1 or IN2) and enable the ON signal. Confirm that current limit is characterized by a foldback functionality. 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 individual 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 rails and keep the load around 1A to 3A. Play with the input voltage levels and be sure that when the difference between input voltages exceeds 28mV, only one rail feeds the load. dc2314af 5 DEMO MANUAL DC2314A QUICK START PROCEDURE – POWER SUPPLY 1 + LOAD SWITCH + POWER SUPPLY 2 – Figure 1. Measurement Equipment Setup 6 dc2314af 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 E16 IN1 6 8 5 7 JP4 E19 E22 E21 6 3 5 E20 2 4 1 + 5 OFF R23 56.2k C4 100uF 50V OPT R22 28.7k OFF 12V 5V 3.3V 5V 3.3V 4 E18 2 3 PPRI_SEL D2OFF IN1 EN PROBE GND GND JP1 E8 ON_SEL E7 IN2 E6 E26 E2 1 GND ON SENSE+ GND 2.9V - 18V IN2 E5 SENSE+ SENSE+ 2.9V - 18V IN1 E1 2 1 1 2 D R10 2.2k TP2 C2 0.1uF 50V R2 100 TP9 C7 0.1uF 50V IN1 1 JP3 3 2 1 4 C6 0.1uF 50V DIODE2_OFF 3 2 OFF-EXT ON C14 0.1uF 50V JP2 EN_SEL 3 2 1 INTVCC C13 0.1uF 50V INTVCC R5 2k 1% R6 13.7k 1% DIS_EXT EN R20 4.64k 1% CPO1 D2OFF_SEL R11 20k R21 2.21k 1% D2 SMAJ17A R1 100 4 2 1 1 2 OPT D2SRC 5 TP4 INTVcc EN GND EP ON 3 2 1 TP10 TP3 C8 DTMR TP12 STANDOFF,NYLON,SNAP-ON,0.50" STANDOFF,NYLON,SNAP-ON,0.50" MP3 LABEL,DEMO BOARD SERIAL NUMBER MP4 STANDOFF,NYLON,SNAP-ON,0.50" PCB, DC2314A REV01 PCB1 STANDOFF,NYLON,SNAP-ON,0.50" MP2 LB1 5 15 U1 * REG TP5 C9 0.1uF 50V SENSE+ C15 0.1uF 16V INTVCC 3 2 1 3 RS1 0.0025 1/2W 25 14 20 21 22 23 24 C11 0.1uF 16V TP7 FB FTMR R19 2k 1% TP8 IMON 8 6 3 7 5V 4 1 5 2 SENSE+ R9 1k R14 1k 1% VCC 3.3V 2 12V JP5 FB_SEL C10 0.01uF 50V R3 1k R4 10 3 2 1 CUSTOMER NOTICE IMON DSTAT2 DSTAT1 FAULT PWRGD FB TP11 HG INTVCC TP6 5 Q3 SiR158DP 4 E11 R15 4.87k 1% APPROVALS C12 0.47uF 16V R17 2.37k 1% D3 GREEN PWRGD R7 3.0k 0805 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SIZE: 11X17 1 DSTAT2 DSTAT1 FAULT PWRGD D2OFF_SEL 3 2 1 3 2 JP8 PULL-UP D2OFF DSTAT2_SEL JP7 E24 E23 E10 E9 GND GND OUT OUT ADJ., 9A R_GND DSTAT2 D2OFF_SEL E15 E14 E13 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only LTC4236-2 DC2314A-B U1 LTC4236-1 DC2314A-A SKU # ASSEMBLY TABLE THIS SCHEMATIC DEPICTS U1 USAGE FOR DC2314A-A. SEE ASSEMBLY TABLE BELOW FOR ALTERNATE U1 USED ON DIFFERENT ASSEMBLY VARIANT SKU#. * NOTES: D6 GREEN D2_ON R13 3.0k 0805 C5 100uF 50V E12 TITLE: DEMO CIRCUIT SCHEMATIC, D5 GREEN D1_ON R12 3.0k 0805 + 1 1 SHEET 1 OF 710-DC2314A_REV 01 SCHEMATIC NO. AND REVISION: DATE: Tuesday, October 27, 2015 PCA BOM: 700-DC2314A-A_REV01 PCA ASS'Y: 705-DC2314A_REV01 1 DUAL IDEAL DIODE-OR AND SINGLE HOT SWAP CONTROLLER WITH CURRENT MONITOR CMON R16 15k 1% D4 RED FAULT R8 3.0k 0805 SCALE = NONE DC2314A-A SKU NO. 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 IC NO. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR LTC4236-1 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 100ms ADJ. DEBOUNCE JP6 LTC4236-UFD-1 0.1uF 50V CPO2 DG2 3 2 1 Q2 SiR158DP PCA ADDITIONAL PARTS 13 6 29 19 5 R18 0 Q4 SiR158DP DG1 MP1 TP1 5 Q1 SiR158DP 4 4 4 C1 0.1uF 50V 27 CPO1 D1 SMAJ17A IN2 C3 100uF 50V OPT 8 D2SRC E4 9 DGATE2 GND 2 REG 2 1 GND CS+ 2 1 1 2 3 3 SENSE+ 2 1 4 28 IN1 NC 16 7 DGATE1 NC 17 10 CPO2 D2OFF 18 1 SENSE- 5 12 DTMR 11 26 HGATE FTMR OUT 2 1 + E3 A B C D DEMO MANUAL DC2314A SCHEMATIC DIAGRAM dc2314af 7 DEMO MANUAL DC2314A 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 dc2314af Linear Technology Corporation LT 0116 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016