DEMO MANUAL DC1555B LTC4365: High Voltage UV, OV and Reverse Supply Protection Controller Description Demonstration circuit DC1555B is intended to demonstrate the performance of the LTC4365 High Voltage Undervoltage (UV), Overvoltage (OV) and Reverse Supply Protection Controller. The LTC4365 protects 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 LTC4365 in a low-current shutdown state. The FAULT pin is asserted when the Controller is in shutdown mode PERFORMANCE SUMMARY or when the input voltage is outside of the UV or OV level. The LTC4365 can withstand DC voltages between –40V and 60V and has a valid operating range of 2.5V to 34V. The DC1555B includes the LTC4365 Controller, two backto-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 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. (TA = 25°C) SYMBOL PARAMETER CONDITIONS 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 IGATE(UP) External N-Channel Gate Pull-Up current IGATE(FAST) External N-Channel Fast Gate Pull-Down Current MIN TYP –30 30 UNITS V 2.2 2.4 V 10 25 50 150 µA µA –1.2 –1.8 mA 3 7.4 3.6 8.4 4.2 9.8 V V GATE = VIN = VOUT = 12V –12 –20 –30 µA 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 MAX 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 dc1555bfa 1 DEMO MANUAL DC1555B Operating Principles The LTC4365 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 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 LTC4365 consumes 10µA during shutdown and 125µA while operating. quick start procedure Demonstration circuit 1555B is easy to set up to evaluate the performance of the LTC4365. Refer to Figures 1a and 1b for proper measurement equipment setup and follow the procedure below. Note that the circuit on the DC1555B is optimized for 12V operation; The Si4230 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 Tests (Figure 1a) 1)Set JP1 to EN. 2)Set JP2 and JP3 to CONNECT LED. 3)Connect a power supply across VIN and GND in negative configuration (connect positive rail to GND and negative rail to VIN). 4)Connect voltmeters at the input and output and ammeter in series with supply. 5)Ramp supply down to –30V (referenced to GND). 6)Verify output voltage is between 0V and –0.5V, all LEDs are off, and 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.) 7)Ramp supply back to 0V. 2 Undervoltage/Overvoltage Test (Figure 1b) 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. 11)Repeat steps 9 and 10 with 8A load connected across VOUT and GND. 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 Jumper Test 12)Remove load and set supply to 9V. 13)Move jumpers and verify LEDs according to Table 2. Table 2 JP1 JP2/JP3 VIN LED VOUT LED EN CONNECT LED On On DIS CONNECT LED On Off EN Open Off Off dc1555bfa DEMO MANUAL DC1555B quick start procedure – POWER SUPPLY 0V TO 30V + dc1555b F01a Figure 1a. Reverse Voltage Measurement + POWER SUPPLY R 0V TO 30V – LOAD dc1555b F01b Figure 1b. Undervoltage/Overvoltage Measurement dc1555bfa 3 DEMO MANUAL DC1555B parts list ITEM QUANTITY REFERENCE DESCRIPTION MANUFACTURERS PART NUMBER Required Circuit Components Current Limiting, Diode, SOD-80 Central Semi. Corporation, CCLM2000 C1 (OPT) Capacitor, X5R, 4.7µF, 50V, 20%, 1210 Taiyo Yuden, UMK325BJ475MM-T C2 (OPT) Capacitor, Alum, 47µF, 35V, 10%, OSCON-CE-6.3 Sanyo, 35CE47AX 0 C3 (OPT) Capacitor, X5R, 10µF, 25V, 10%, 1210 Taiyo Yuden, TMK325BJ106KM 2 D1, D2 LED, GRN Panasonic, LN1351CTR 6 1 D3 LED, RED Panasonic, LN1251CTR 7 1 D4 Diode, 75V/200mW, SOD-523 Diodes Inc., 1N4148WT 8 0 D5 (OPT) Zener Diode, 15V, SOD-523 Diodes Inc., BZT52C15T #PbF 9 0 D6 (OPT) Zener Diode, 20V, POWERDI-123 Diodes Inc., DFLT20A #PbF 10 0 D7 (OPT) Zener Diode, 40V, POWERDI-123 Diodes Inc., DFLT40A #PbF 11 4 E1, E2, E6, E7 Turret, Testpoint 0.094" Mill Max 2501-2-00-80-00-00-07-0 12 4 E3, E4, E5, E8 Turret, Testpoint 0.063" Mill Max 2308-2-00-80-00-00-07-0 13 3 JP1, JP2, JP3 Headers, Sgl. Row, 3 Pins, 2mm Ctrs. Samtec, TMM-103-02-L-S 14 1 Q1 Dual N-Channel, 30V, SO-8 Vishay, SI4230DY-T1-GE3 15 0 Q2 (OPT) Dual N-Channel, Low Current, SOT-563 Diodes Inc., 2N7002V-7 16 1 R1 (Bal to #1608A) Resistor, Chip, 1M, 0.06W, 1%, 0603 Vishay, CRCW06031M00FKEA 17 1 R2 Resistor, Chip, 54.9k, 0.06W, 1%, 0603 Vishay, CRCW060354K9FKEA 18 1 R3 Resistor, Chip, 36.5k, 0.06W, 1%, 0603 Vishay, CRCW060336K5FKEA 19 1 R4 Resistor, Chip, 510k, 0.06W, 5%, 0603 Vishay, CRCW0603510KJNEA 20 1 U1 IC, Over/Under/RevV/RevI Protection, SC8 Linear Technology Corporation, LTC4365CTS8 21 3 XJP1, XJP2, XJP3 Shunt, 2mm Ctrs. Samtec, 2SN-BK-G 22 4 Stand-Off, Nylon, 0.25" Tall Keystone, 8831(Snap On) 4 1 3 CLD1, CLD2, CLD3 2 0 3 0 4 5 dc1555bfa 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 5 5 4 4 SHDN FAULT VOUT GATE GND OV UV VIN CUSTOMER NOTICE 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SCALE = NONE Vlad O. APPROVALS 2 MODIFY DATE: www.linear.com DATE 1 SHEET 1 OF 1 IC NO. REV. 1 TITLE: SCHEMATIC SIZE TECHNOLOGY + APPROVED DESCRIPTION 1 REVISION HISTORY 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 APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 3 A B C D DEMO MANUAL DC1555B Schematic Diagram dc1555bfa 5 DEMO MANUAL DC1555B 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. 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