DEMO MANUAL DC1555C LTC4365/LTC4365-1: Overvoltage, Undervoltage and Reverse Supply Protection Controller Description Demonstration circuit DC1555C is intended to demonstrate the performance of the LTC4365 and LTC4365-1 Undervoltage, Overvoltage and Reverse Supply Protection Controllers. The LTC®4365/LTC4365-1 protect circuits from input voltages that may be too high, too low or negative. It operates by controlling the gates of two back-to-back connected MOSFETs to keep the output in a safe range. The OV and UV protection levels are adjusted by resistive dividers at the OV and UV pins. Asserting the SHDN pin disables the MOSFETs and places the controller in a low-current shutdown state. The FAULT pin is asserted when the Controller is in shutdown mode or when the input voltage is outside of the UV or OV level. Regarding the supply protection parameters, the LTC4365 and LTC4365-1 are identical. The only differences are in the gate fault recovery delay time and the delay from turn-off to low-power operation. These delays are 36ms (typ, both) for the LTC4365, while they are 1ms and 0.7ms respectively for the LTC4365-1. The DC1555C includes the controller, two back-to-back connected power MOSFETs, three jumpers and three LEDs to indicate the input and output voltages and the FAULT pin signal. Design files for this circuit board are available at http://www.linear.com/demo/DC1555C 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. The LTC4365 and LTC4365-1 can withstand DC voltages between –40V and +60V and have a valid operating range of 2.5V to 34V. Performance Summary SYMBOL (TA = 25°C) PARAMETER CONDITIONS MIN TYP MAX 30 V 2.2 2.4 V 10 25 50 150 µA µA –1.2 –1.8 mA V V –30 UNITS VIN Board Input Voltage Range VIN(UVLO) Input Supply Undervoltage Lockout VIN Rising IVIN Input Supply Current SHDN = 0V SHDN = 2.5V IVIN(R) Reverse Input Supply Current VIN = –40V, VOUT = 0V ΔVGATE External N-Channel Gate Drive (GATE – VOUT) VIN = VOUT = 5V, IGATE = –1µA VIN = VOUT = 12V to 34V, IGATE = –1µA 3 7.4 3.6 8.4 4.2 9.8 IGATE(UP) External N-Channel Gate Pull-Up current GATE = VIN = VOUT = 12V –12 –20 –30 µA IGATE(FAST) External N-Channel Fast Gate Pull-Down Current Fast Shutdown, GATE = 20V, VIN = VOUT = 12V 31 50 72 mA 50 90 150 µA IGATE(SLOW) External N-Channel Gentle Gate Pull-Down Current Gentle Shutdown, GATE = 20V, VIN = VOUT = 12V 1.8 VUV UV Input Threshold Voltage UV Falling → ΔVGATE = 0V 492.5 500 507.5 mV VOV OV Input Threshold Voltage OV Rising → ΔVGATE = 0V 492.5 500 507.5 mV tGATE(FAST) External N-Channel Fast Gate Turn-Off Delay CGATE = 2.2nF, UV or OV Fault 2 4 µs tFAULT OV, UV Fault Propagation Delay Overdrive = 50mV, VIN = VOUT = 12V 1 2 µs VSHDN SHDN Input Threshold SHDN Falling to ΔVGATE = 0V 0.75 1.2 V 0.4 dc1555cfd 1 DEMO MANUAL DC1555C Operating Principles The LTC4365/LTC4365-1 monitors the input rail voltage and disconnects downstream circuits when the input voltage is too low, too high or negative. The LTC4365 provides accurate overvoltage and undervoltage comparators to ensure that power is applied to the system only if the input supply is within the allowable voltage window. Reverse 2 supply protection circuit automatically isolates the load from negative input voltages. During normal operation, a high voltage charge pump enhances the gate of external N-channel power MOSFETs. The controller consumes 10µA during shutdown and 125µA while operating. dc1555cfd DEMO MANUAL DC1555C Quick Start Procedure Demonstration circuit 1555C is easy to set up to evaluate the performance of the LTC4365/LTC4365-1. Refer to Figures 1a and 1b for proper measurement equipment setup and follow the procedure below. Note that the circuit on the DC1555C is optimized for 12V operation. The Si4214 FET limits overvoltage and reverse voltage to 30V and –30V, respectively. Refer to the LTC4365 data sheet for applications optimized for other voltages. Reverse Voltage Test (Figure 1b) 1)Set JP1 to EN. 2)Set JP2 and JP3 to CONNECT LED. 3) Connect a power supply across VIN and GND in a negative configuration (connect positive rail to GND and negative rail to VIN). Undervoltage/Overvoltage Test (Figure 1a) 8) Reverse the polarity of power supply connection across VIN to GND (connect positive rail to VIN and negative rail to GND). 9) Ramp supply up to 30V and verify green VIN LED, red FAULT LED, green VOUT LED, and VOUT according to Table 1 within the various voltage ranges. 10)Ramp supply down from 30V down to 0V and verify green VIN LED, red FAULT LED, green VOUT LED, and VOUT according to Table 1. Table 1 VIN VOUT VIN LED VOUT LED FAULT LED 0V to 5.77V = 0V Off/Dim/On Off On 6.56V to 13.51V = VIN On On Off 15.47V to 30V = 0V On Off On 4) Connect voltmeters at the input and output and ammeter in series with supply. Jumper Test 5) Ramp VIN down to –30V (referenced to GND). 11)Remove load and set supply to 9V. 6) Verify that the output voltage is between 0V and –0.5V, all LEDs are off, and the input current is <1.8mA. (FET leakage or other board leakage paths can pull VOUT slightly negative, but it will be clamped by the internal protection diode.) 12)Move jumpers and verify LEDs according to Table 2. 7) Ramp supply back to 0V. Table 2 JP1 JP2/JP3 VIN LED VOUT LED EN CONNECT LED On On DIS CONNECT LED On Off EN Open Off Off dc1555cfd 3 DEMO MANUAL DC1555C quick start procedure Figure 1a. Undervoltage/Overvoltage Measurement Figure 1b. Reverse Voltage Measurement 4 dc1555cfd 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 DIS EN 5 E5 JP1 3 2 SHDN 1 OV E4 E3 E2 E1 D1 GRN VIN CLD1 CMJ2000 TR 3 2 1 D7 DFLT40A (OPT) 1N4148WT D4 VIN D6 DFLT20A (OPT) JP2 VIN D3 RED FAULT CLD3 CMJ2000 TR OPEN CONNECT LED JP3 VOUT LED DRIVE R4 510k GATE ON OV PROTECTED 6V TO 15V 0V TO 6V VOUT REVERSE PROTECTED UV PROTECTED VIN -30 TO 0V 15V TO 30V UV GND SHDN * VIN * 5 3 2 1 4 4 D2 GRN VOUT CLD2 CMJ2000 TR R3 36.5k 1% R2 54.9k 1% R1 1M 1% SHDN FAULT VOUT GATE LTC4365CTS8 GND OV UV VIN G2 D2 5 6 7 8 Q1B Si4214DDY-T1-GE3 S2 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE 4 3 2 1 U1 Q1A Si4214DDY-T1-GE3 G1 S1 Q2B 2N7002VC-7-F (OPT) BZT52C15T (OPT) D5 1000pF 0805 C3 (OPT) 1 2 - 2 SCALE = NONE Vlad O. RB APPROVALS C1 4.7µF 50V (OPT) 2 U1 LTC4365CTS8 LTC4365CTS8-1 1 SHEET 1 OF 1 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY HIGH VOLTAGE NFET DRIVER UV, OV AND REVERSE SUPPLY PROTECTION IC NO. REV. LTC4365CTS8/LTC4365CTS8-1 2 DEMO CIRCUIT 1555C MODIFY DATE: Oct 26, 2015 N/A SIZE FAULT GND * 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 DC1555C-A DC1555C-B TECHNOLOGY TITLE: SCHEMATIC E8 E7 E6 BOARD ASSEMBLY C2 47µF + 35V (OPT) VOUT VOUT Vlad Ostrerov Replaced Q1, LED's & CLD's. Oct 26, 2015 DATE Apr 15, 2015 APPROVED Vlad Ostrerov 1 DESCRIPTION Replaced LED's, Added -B Assembly REVISION HISTORY (LOW CURRENT MOSFET, SMALL PACKAGE OPTION) REV ECO 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. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. (UV = 6V) (OV = 15V) D1 Q2A 2N7002VC-7-F (OPT) 3 A B C D DEMO MANUAL DC1555C Schematic Diagram dc1555cfd 5 DEMO MANUAL DC1555C 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 dc1555cfd Linear Technology Corporation LT 0416 REV D • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2011