NUD4700 LED Shunt The NUD4700 is an electronic shunt which provides a current bypass in the case of a single LED going into open circuit. LEDs are by nature quite fragile when subjected to transients and surge conditions. There are also many cases where high reliability of the LED lighting must be maintained such as headlights, lighthouses, bridges, aircraft, runways and so forth. In these cases the low cost addition of the NUD4700 will provide full assurance that an entire string of LEDs will not extinguish should one LED fail. NUD4700 is also applicable to other loads where circuit continuity is required. This device is designed to be used with 1 W LEDs (nominally 350 mA @ 3 V). www.onsemi.com Anode Control Circuit Features • • • • • • A Simple Two Terminal Device Automatically Resets Itself if the LED Heals Itself or is Replaced ON−State Voltage Typically 1 V OFF−State Current less than 250 mA Available with White Package This is a Pb−Free Device Cathode Anode Cathode Typical Applications • • • • • LEDs where Preventive Maintenance is Non Practical LED Headlights LEDs with High Reliability Requirements Crowbar Protection for Open Circuit Conditions Overvoltage Protection for Sensitive Circuits POWERMITE[ CASE 457 MARKING DIAGRAM M MNHG Anode Cathode M = Date Code MNH = Device Code G = Pb−Free Package PIN FUNCTION DESCRIPTION Pin Description Anode Positive Input Voltage to the Device Cathode Negative Input Voltage to the Device ORDERING INFORMATION Device Package Shipping† NUD4700SNT1G POWERMITE (Black) 3000/Tape & Reel NUD4700WSNT1G POWERMITE (White) 3000/Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. © Semiconductor Components Industries, LLC, 2016 May, 2016 − Rev. 9 1 Publication Order Number: NUD4700/D NUD4700 MAXIMUM RATINGS (Maximum ratings are those, that, if exceeded, may cause damage to the device. Electrical Characteristics are not guaranteed over this range) Rating Symbol Value Unit VDM −0.3 to 10 V Peak Repetitive Off State Voltage (Anode to Cathode) Average On−State Current, (TA = 25°C), (Note 1) (Note 2) IT(AVG) A 1.3 0.376 Thermal Resistance, Junction−to−Air (Note 1) (Note 2) °C/W QJA Thermal Resistance, Junction−to−Lead 80 277 °C/W 35 QJL Power Dissipation (TA = 25°C) (Note 1) (Note 2) PMAX W Operating Temperature Range TJ −40 to 150 °C Non−Operating Temperature Range TJ 150 °C Lead Temperature, Soldering (10 Sec) TL 260 °C 1.56 0.45 Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 1. Mounted onto a 1“ x 1” square copper pad. Normally this device would be mounted on the same copper heat sink and adjacent to the LED. If the LED were to go open, then the NUD4700 shunt would now dissipate the power using the same copper heat sink. Since the NUD4700 has a voltage that is nominally 30% of the LED, then the power dissipation would be easily handled by the same heat sink as the LED. 2. Device mounted on minimum copper pad. ELECTRICAL CHARACTERISTICS (Unless otherwise noted: TA = 25°C) Characteristics Symbol Min Typ Max Unit Off−State Current (VAnode = 5 V) ILEAK − 100 250 mA Breakdown Voltage (IBR = 1 mA) V(BR) 5.5 − 7.5 V Holding Current (VAnode = 10 V, Iinitial = 100 mA) IH − 6.0 12 mA Latching Current (VAnode = 10 V) IL − 35 70 mA VT − − − 1.0 1.0 1.0 1.2 − − V dV/dt 250 − − V/ms On−State Voltage (IT = 0.350 A) (IT = 0.750 A) (IT = 1.0 A) DYNAMIC CHARACTERISTICS Critical Rate−of−Rise of Off State Voltage (Vpk = Rated V(BR), TJ = 125°C, Exponential Method) Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. www.onsemi.com 2 NUD4700 TYPICAL PERFORMANCE CURVES (TA = 25°C unless otherwise noted) 6 35 IH, HOLDING CURRENT (mA) IL, LATCHING CURRENT (mA) 40 30 25 20 15 10 5 0 −50 −25 0 25 50 75 100 125 3 2 1 −25 0 25 50 75 100 125 150 TA, AMBIENT TEMPERATURE (°C) TA, AMBIENT TEMPERATURE (°C) Figure 1. Latching Current vs Temperature Figure 2. Holding Current vs Temperature IDSS, LEAKAGE CURRENT (mA) 450 90 80 70 60 50 0 1 2 3 4 400 350 300 250 200 150 100 50 0 −50 5 25 50 75 100 125 150 TA, AMBIENT TEMPERATURE (°C) Figure 4. Leakage Current vs Temperature 1.2 1.2 1.1 IT @ 1.0 mA 1 IT @ 350 mA 0.6 0.4 IT @ 750 mA 0.2 −25 0 25 50 75 100 125 150 1 0.9 0.8 0.7 0.6 0.5 0.25 0 −50 0 VOLTS (V) 1.4 0.8 −25 Figure 3. Capacitance vs Voltage VT, ON−STATE VOLTAGE (V) Cd, CAPACITANCE (pF) 4 0 −50 150 100 VT, ON−STATE VOLTAGE (V) 5 175 0.35 0.45 0.55 0.65 0.75 0.85 0.95 TEMPERATURE (°C) IT, ON−STATE CURRNT (A) Figure 5. On−State Voltage vs. Temperature Figure 6. On−State Voltage vs. On−State Current (IT) at 255C www.onsemi.com 3 1.05 NUD4700 TYPICAL APPLICATION CIRCUIT Q1 AC/DC Converter NUD4001 R1 Current Source NUD4700 Control Circuit NUD4700 Control Circuit NUD4700 Control Circuit NUD4700 Control Circuit NUD4700 Control Circuit Figure 7. Typical Application Circuit www.onsemi.com 4 NUD4700 TYPICAL OPERATION WAVEFORMS Switching event LED being opened LED Current NUD4700 voltage Off state NUD4700 voltage ON−state NUD4700 switching waveforms (Powermite) Figure 8. NUD4700 Switching Waveforms Switching event LED being opened Current overshoot due to response time of current source LED Current NUD4700 voltage Off state NUD4700 voltage ON−state NUD4700 switching waveforms (zoom in) Figure 9. Zoom in of Figure 8 www.onsemi.com 5 NUD4700 PACKAGE DIMENSIONS POWERMITE CASE 457−04 ISSUE F F 0.08 (0.003) C −A− J T B M C S S S NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. DIM A B C D F H J K L R S PIN 1 −B− K PIN 2 R L J MILLIMETERS INCHES MIN MAX MIN MAX 1.75 2.05 0.069 0.081 1.75 2.18 0.069 0.086 0.85 1.15 0.033 0.045 0.40 0.69 0.016 0.027 0.70 1.00 0.028 0.039 -0.05 +0.10 -0.002 +0.004 0.10 0.25 0.004 0.010 3.60 3.90 0.142 0.154 0.50 0.80 0.020 0.031 1.20 1.50 0.047 0.059 0.50 REF 0.019 REF D H −T− 0.08 (0.003) M T B S C S SOLDERING FOOTPRINT* 0.635 0.025 2.67 0.105 0.762 0.030 2.54 0.100 1.27 0.050 SCALE 10:1 mm Ǔ ǒinches *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. POWERMITE is a registered trademark of and used under a license from Microsemi Corporation. ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. 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