DEMO MANUAL DC1625A LTC4227-1/LTC4227-2/ LTC4227-3/LTC4227-4 Dual Ideal Diode and Single Hot Swap Controller Description Demonstration circuit 1625A is intended to demonstrate performance of the LTC4227-1/LTC4227-2/LTC4227-3/ LTC4227-4 dual ideal diode and Hot Swap™ controller. Each rail has an individual ideal diode. Ideal diode outputs are connected to the load through a single Hot Swap circuit. jumpers for enabling the second ideal diode (D2ON_SEL) and Hot Swap controller (HS_ON), two LEDs to indicate power good (PWRGD) and fault (FAULT) conditions, seven banana jacks for connecting power supplies and load, many turrets and pads for observing circuit signals. The DC1625 allows verifying the LTC4227 Hot Swap and ideal diode functionality during individual supply ramp-up and ramp-down transients, during power supply switchover, steady state, and overcurrent fault conditions. Table 1. DC1625A Assembly Options Each DC1625A rail circuit is assembled to operate over the full operating voltage range of the LTC4227: 2.9V to 18V, with a 7.6A maximum current load. The board’s main components include the LTC4227 controller, two power MOSFETs controlled as ideal diodes and one power MOSFET controlled as a Hot Swap device, two PERFORMANCE SUMMARY SYMBOL PART OVERCURRENT FAULT START-UP DELAY DC1625A-A LTC4227-1 LATCHOFF 100ms DC1625A-B LTC4227-2 RETRY 100ms DC1625A-C LTC4227-3 LATCHOFF 1.6ms DC1625A-D LTC4227-4 RETRY 1.6ms VERSION 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. (TA = 25°C) PARAMETER CONDITIONS MIN TYP MAX UNITS Supplies VIN Input Supply Range 2.9 18.0 V VINTVCC Internal Regulator Voltage 4.5 5 5.6 V VINTVCC(UVL) Internal VCC Undervoltage Lockout 2.1 2.2 2.3 V 10 25 40 mV INTVCC Rasing Ideal Diode Control ΔVFWD(REG) Forward Regulation Voltage (VINn – VSENSE) ΔVDGATE External N-Channel Gate Drive (VDGATEn - VINn) IN < 7V, ΔVFWD = 0.1V IN = 7V to 18V, ΔVFWD = 0.1V 5 10 7 12 14 14 V V ICPO(UP) CPOn Pull-Up Current CPO = IN = 2.9V CPO = IN = 18V –60 –50 –95 –85 –120 –110 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 D2ON = 2V, ΔVDGATE2 = 2.5V tON(DGATE) DGATEn Turn-On Delay ΔVFWD = 0.2V, CGATE = 10nF 0.25 0.5 µs tOFF(DGATE) DGATEn Turn-Off Delay ΔVFWD = –0.2V, CGATE = 10nF 0.2 0.5 µs tPLH(DGATE2) D2ON Low to DGATE2 High 40 100 µs 40 100 200 µA dc1625afa 1 DEMO MANUAL DC1625A PERFORMANCE SUMMARY SYMBOL (TA = 25°C) PARAMETER CONDITIONS MIN TYP MAX UNITS Hot Swap Control ΔVSENSE(CB) Circuit Breaker Trip Sense Voltage (VSENSE+ - VSENSE –) 47.5 50 52.5 mV ΔVSENSE(ACL) Active Current Limit Sense Voltage (VSENSE+ - VSENSE –) 60 65 70 mV ΔVHGATE External N-Channel Gate Drive (VHGATE - VOUT ) IN < 7V, I = 0, –1μA IN = 7V to 18V, I = 0, –1μA 4.8 10 7 12 14 14 V V IGATE(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 150 300 500 µA IHGATE(FPD) External N-Channel Gate Fast Pull-Down Current Fast Turn-Off, OUT = 12V, HGATE = OUT + 5V 100 200 300 mA VSENSE+(UVL) SENSE+ Undervoltage Lockout SENSE+ Rising 1.75 1.9 2.05 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 0.55 0.6 0.65 V VD2ON(TH) D2ON Pin Threshold Voltage D2ON Rising 1.21 1.235 1.26 V V TMR(TH) TMR Pin Threshold Voltage TMR Rising TMR Falling 1.198 0.15 1.235 0.2 1.272 0.25 V V Input/Output Pin ITMR(UP) TMR Pull-Up Current TMR = 1V, In Fault Mode –75 –100 –125 µA ITMR(DN) TMR Pull-Down Current TMR = 2V, No Faults 1.4 2 2.6 µA ITMR(RATIO) TMR Current Ratio ITMR(DN)/ ITMR(UP) 1.4 2 2.7 % Operating Principles The LTC4227 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. The LTC4227 regulates the forward voltage drop across the MOSFETs to ensure smooth current transfer from one supply to other without oscillation. A fast 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. 2 The Hot Swap fast acting current limit and internal timed circuit breaker protect circuit components when a shortcircuit fault occurs. The Hot Swap function on the LTC4227 controller has independent on/off control. Each ideal diode MOSFET is activated from individual charge pump sources and the second ideal diode path has additional on/off control. The LTC4227-1 and LTC4227-3 feature a latchoff circuit breaker, while the LTC4227-2 and the LTC4227-4 provide automatic retry after a fault. dc1625afa DEMO MANUAL DC1625A quick start procedure Demonstration circuit 1625A is easy to set up to evaluate the performance of the LTC4227. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: If the second ideal diode is used: The DC1625A test includes independent test of the LTC4227 hot swapping functionality and ideal diode functionality. JP3 ON_SEL in the position OFF HOT SWAP FUNCTIONALITY TEST This test is performed with singe rail operation, when the rail output is provided through two series connected MOSFETs. One MOSFET functions as an ideal diode and other one as a Hot Swap circuit component. The parameters of the three transients in different operation modes completely characterize the Hot Swap circuit performance. These actions are: - A power-up without any additional load - A current limit operation after successful power-up transient - A power-up with shorted output 1. Initially, install the jumper heads in the following positions, if the first ideal diode is used in the test: JP1 EN_SEL in the position LOW JP2 D2ON_SEL in the position OFF JP3 ON_SEL in the position OFF JP1 EN_SEL in the position LOW JP2 D2ON_SEL in the position ON Connect a 12V power supply to the board input turrets IN1 (or IN2) and GND. Do not load the output. Place the current probe on the 12V wire and voltage probes on the OUT turret. Provide ON signal at the ON pin by changing the JP3 jumper header position from OFF position to ON. Observe the transient. The output voltage rise time should be in the range of 12ms to 29ms. PWRGD green LED D3 (D5) must turn on. Turn off the rail using the ON 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 7.8A to 8.9A. The DC1625A-A and DC1625-C circuit feature a latchoff circuit breaker, and DC1625A-B and the DC1625‑D provide automatic retry after a fault. Turn off the rail with the ON_SEL jumper. 3. Initially short output with external wire. Place the current probe at this external wire. Turn on the rail and record the current shape. The maximum current should be in the 10.1A to 11.8A range. dc1625afa 3 DEMO MANUAL DC1625A quick start procedure 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 another ideal diode to be on. Connect input turrets (IN1 and IN2) of each ideal diode with individual independent lab supply. Adjust each input voltage to 12V with maximum possible accuracy. Place 4 one voltmeter between IN1 and IN2 turrets to measure the difference between two input voltages. Connect an electronic load to the output turret. Activate both rail and keep a load around 1A to 3A. Play with input voltage levels and be sure that when the difference between input voltages exceeds 40mV, only one rail feeds the load. dc1625afa DEMO MANUAL DC1625A quick start procedure – POWER SUPPLY 1 + LOAD + SWITCH POWER SUPPLY 2 – DC1625A F01 Figure 1. DC1625A Measurement Equipment Setup dc1625afa 5 DEMO MANUAL DC1625A parts list ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP, X7R, 0.1µF, 50V, 0603 TDK, C1608X7R1H104K DC1625A General BOM 1 8 C1, C2 ,C3, C4, C6, C7, C10, C11 2 1 C5 CAP, X7R, 15nF, 50V, 0603 AVX, 06035C153KAT 3 0 C8, C9 OPT CAP, AL, El, S/M 100µF, 50V SUNCON, 50CE100BS 4 1 C12 CAP, AL, El, S/M 100µF, 50V SUNCON, 50CE100BS 5 0 C12 OPT CAP, AL, El, S/M 1000µF, 50V NIC, NACEW102M50V16X17TR13F 6 2 D1, D2 DIODE, VOLTAGE SUPPRESSOR, SMA DIODES, SMAJ17A-13-F 7 1 D3 LED, SMT GREEN PANASONIC, LN1351CTR 8 1 D4 LED, SMT RED PANASONIC, LN1261CTR 9 11 E1, E3, E6, E8, E9, E12 to E17 TURRET, TESTPOINT, 2501 MILL-MAX, 2501-2-00-80-00-00-07-0 10 7 E2, E4, E5, E7, E10, E11, E18 JACK BANANA KEYSTONE, 575-4 11 2 E27, E28 TURRET, TESTPOINT, 2308 MILL-MAX, 2308-2-00-80-00-00-07-0 12 3 JP1, JP2, JP3 HEADERS, 3 PINS 2mm CTRS SAMTEC TMM-103-02-L-S 13 3 XJP1, XJP2, XJP3 SHUNT, 2mm CTRS SAMTEC 2SN-BK-G 14 2 Q1, Q2 MOSFET, N-CHANNEL, 30V VISHAY, SiR462DP-T1-GE3 15 1 Q3 MOSFET, N-CHANNEL, 30V VISHAY, Si7336ADP-T1-GE3 16 1 RS1 RES, CHIP, 0.006, 1/2W, 1%, 2010 KOA, TLR2HDBK6L00F75 17 3 R1, R9, R10 RES, CHIP, 10, 1%, 0603 VISHAY, CRCW060310R0FKEA 18 1 R2 RES, CHIP, 47, 1%, 0603 VISHAY, CRCW060347R0FKEA 19 2 R3, R7 RES, CHIP, 20k, 1%, 0603 VISHAY, CRCW060320K0FKEA 20 1 R4 RES, CHIP, 22.1k, 1%, 0603 VISHAY, CRCW060322K1FKEA 21 2 R5, R6 RES, CHIP, 3k, 1%, 0805 VISHAY, CRCW08053K00FKEA 22 1 R8 RES, CHIP, 28.7k, 1%, 0603 VISHAY, CRCW060328K7FKEA 23 4 STAND-OFF STAND-OFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON) 24 1 STENCIL STENCIL 1625A DC1625A-A 1 1 DC1625A General BOM 2 1 U1 I.C. LTC4227CUFD-1, QFN20-4x5 1 1 DC1625A General BOM 2 1 U1 I.C. LTC4227CUFD-2, QFN20-4x5 1 1 DC1625A General BOM 2 1 U1 I.C. LTC4227CUFD-3, QFN20-4x5 1 1 DC1625A General BOM 2 1 U1 I.C. LTC4227CUFD-4, QFN20-4x5 LINEAR TECHNOLOGY, LTC4227CUFD-1 DC1625A-B LINEAR TECHNOLOGY, LTC4227CUFD-2 DC1625A-C LINEAR TECHNOLOGY, LTC4227CUFD-3 DC1625A-D 6 LINEAR TECHNOLOGY, LTC4227CUFD-4 dc1625afa 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 5 4 ASSY TABLE 2 * 1 2 + + 1 D 3 2 2 * 3 4 TECHNOLOGY 1 1 + ( ( 5 A B C D DEMO MANUAL DC1625A Schematic Diagram dc1625afa 7 DEMO MANUAL DC1625A 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 dc1625afa Linear Technology Corporation LT 1013 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 2011