1 description lt c4367 100v overvoltage, undervoltage and reverse supply protection controller demonstration circuit 2417a is intended to demonstrate the performance of the LTC4367 100v overvoltage (ov), undervoltage (uv), and reverse supply protection controller. this controller 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 n-channel mosfets to keep the output in a safe range. the uv and ov setpoints are configured by the resistive divider on the uv and ov inputs. asserting the shdn pin disables the mosfets and places the LTC4367 in a low current shutdown state. the fault pin asserts when the controller is in the shutdown mode or when the input voltage is outside of the uv/ov window. the LTC4367 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. performance summary can withstand dc voltages between C40v and 100v and has an operating range of 2.5v to 60v. the dc2417a includes the LTC4367, two back-to-back connected power mosfets, three jumpers and three leds to indicate the input and output voltages and the fault pin signal. the dc2417a is assembled in two options: dc2417a-a, which is populated with LTC4367, and dc2417a-b, which uses LTC4367-1. design files for this circuit board are available at http: //www.linear.com/demo/dc2417a specifications are at t a = 25c symbol parameter conditions min typ max units v in input voltage range operating range protection range 2.5 C40 60 100 v v v in(uvlo) input supply undervoltage lockout v in rising 1.8 2.2 2.4 v i vin input supply current; on off shdn = 2.5v shdn = 0v, v in = v out 30 5 90 20 a a i vin(r) reverse input supply current v in = C40v, v out = 0v C1.5 C2 ma ?v gate gate drive (gate C v out ) v in = v out = 5.0v, i gate = 0a, C1a v in = v out = 12v to 34v, i gate = C1a 7.2 10 8.7 11 10.8 12.2 v v i gate(up) gate pull-up current gate = 15v, v in = v out = 12v C20 C35 C50 a i gate(fast) gate fast pull-down current gate = 20v, v in = v out = 12v 30 60 90 ma i gate(slow) gate slow pull-down current gate = 20v, v in = v out = 12v 50 90 160 a v uv uv input threshold voltage uv falling 492.5 500 507.5 mv v ov ov input threshold voltage ov rising 492.5 500 507.5 mv t gate(fast) gate fast turn-off delay c gate = 2.2nf, uv or ov fault 2 4 s t fault ov, uv fault propagation delay overdrive = 50mv, v in = v out = 12v 1 2 s v shdn shdn input threshold shdn falling 0,4 0.75 1.2 v v uv_board board uv range 5.75 5.97 6.17 v v ov_board board ov range 14.44 14.95 15.47 v dc2417af demo manual dc2417a
2 operating principles quick start procedure the LTC4367 monitors the input voltage and disconnects downstream circuits when the input voltage is too low, too high or negative. the LTC4367 provides accurate overvolt - age 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 circuits automatically isolate the load from negative input voltages. dc2417 a is easy to set up to evaluate the performance of the LTC4367. refer to figure 1 for proper measurement equipment setup and follow the procedure below. reverse voltage tests 1 set jp1 to en. 2 set jp2 and jp3 to connect led. 3 connect a power supply across vin and gnd in nega - tive confguration (connect positive terminal to gnd and negative terminal to vin). 4 connect voltmeters at the input and output and an ammeter in series with the supply. 5 ramp vin down to C30v (referenced to gnd). 6 verify output voltage is 0v and all leds are off. 7 set jp2 and jp3 to open position and measure the input current. it should be 2.4ma. 8 ramp vin back to 0v and set jp2 and jp3 to connect led position. undervoltage/overvoltage test 9 correct the polarity of the power supply connection across vin to gnd (connect positive terminal to vin and negative terminal to gnd). during normal operation, a high voltage charge pump en - hances the gate of the external n-channel power mosfets. the LTC4367 consumes 5a during shutdown and 70a while operating. 10 ramp supply up to 60v and verify that the green vin led and the red fault led light up, but the green vout led, does not light up. 11 ramp supply down from 60v to 0v and verify the green vin led, red fault led, green vout led, and vout voltage according to table 1 below. 12 repeat steps 10 and 11 with a 3 a resistive load con - nected between vout and gnd. table 1 vin vout vin led vout led fault led 0v to 5.97v 0v off/dim/on off on 5.97v to 14.95v v in on on off 14.95v to 60v 0v on off on 13 remove load and set supply to 9v. 14 move jumpers and verify leds according to table 2 below. table 2 jp1 jp2/jp3 vin led vout led en connect led on on dis connect led on off en open off off dc2417af demo manual dc2417a
3 + power supply 0v to 40v ? quick start procedure figure 1a . reverse voltage test dc2417af demo manual dc2417a
4 quick start procedure figure 1b . undervoltage/overvoltage test ? power supply 0v to 100v load + r dc2417af demo manual dc2417a
5 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 representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a ????????? ??? ???? ????????? ???????? ????????? ??????????? ????????????????? ???????????? ??????? ???????????? ????????? ?????????? ? ? ? board assembly dc2417a-a u1 ??????????? dc2417a-b ????????????? may 28, 2015 ? ?????????? ????????????? ??? ???? revision history description date approved eco rev ????????????? 1st prototype ?? oct 07, 2015 revision history description date approved eco rev ????????????? 1st prototype ?? oct 07, 2015 revision history description date approved eco rev ????????????? 1st prototype ?? oct 07, 2015 size modify date: ic no. rev. sheet of title: approvals pcb des. app eng. technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ???????????????????????????????????????? customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications ; however, it remains the customer's responsibility t o verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circu it performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology an d schematic supplied for use with linear technology parts. scale = none www.linear.com 2 ?????????????????? ???????????? 1 1 ??????????????????????????????????? ??? ????????????????????????? ?? vlad o. ????????????????????????? ????????????? size modify date: ic no. rev. sheet of title: approvals pcb des. app eng. technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ???????????????????????????????????????? customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications ; however, it remains the customer's responsibility t o verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circu it performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology an d schematic supplied for use with linear technology parts. scale = none www.linear.com 2 ?????????????????? ???????????? 1 1 ??????????????????????????????????? ??? ????????????????????????? ?? vlad o. ????????????????????????? ????????????? size modify date: ic no. rev. sheet of title: approvals pcb des. app eng. technology ?????????????????? ?????????????????? ???????????????????? ??????????????????? ???????????????????????????????????????? customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications ; however, it remains the customer's responsibility t o verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circu it performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology an d schematic supplied for use with linear technology parts. scale = none www.linear.com 2 ?????????????????? ???????????? 1 1 ??????????????????????????????????? ??? ????????????????????????? ?? vlad o. ????????????????????????? ????????????? ?? ??? ??? ?? ??? ?? ????? q2 (opt) dpak ?? ?? ???? ??????? q3 (opt) dpak ?? ?????? ????? ???? ?? ????? ???? ????? ?? ?? ?? ???? ?? ??? ????? + ?? ???? ???? (opt) ?? ??????????????? vin ? gate ? uv ? vout ? fault ? ov ? gnd ? shdn ? ?? ????? ?? ??? ??????? ??? ???? ???? ? ? ? ?? ?????????????? ? ? ? ? ? ? ? ? ?? ?? ?? ?? ???????????? ????? ???? ??????? ?? ???????? ????? ?? ??? ?? ???? ???? ??????? ??? ??? ? ? ? ??? ?? ??? ???? ? ? ? ?? ????? ?? ?? ?? ???? ?? ???? ???????? ?? ??? ?? ????? ????????? sod-523 ?? ?? ???? ?? ??? ???? ?? ?????????? dc2417af demo manual dc2417a
6 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2015 lt 1115 ? printed in usa 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 users 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 whatsoeve r . 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 dc2417af demo manual dc2417a
|
