TVS Diodes for 12 V Powertrains. Centralized Load Dump Suppression-Type Alternator
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1 VISHAY GENERAL SEMICONDUCTOR Protection Diodes By Kim Sweetman DEFINITION OF CENTRALIZED LOAD DUMP SUPPRESSION-TYPE ALTERNATORS Conventional powertrains use a standard-type alternator diode and regulator to control the output voltage for normal operations. The regulator controls output voltage in normal rotor operations and does not suppress high voltages in load dump situations. Conventional-Type Alternator Centralized Load Dump Suppression-Type Alternator A centralized load dump suppression-type alternator is different than a traditional powertrain in that it suppresses high voltages when it reaches load dump status to lower them to a specified voltage range, thus ensuring normal operation. Most central load dump suppression-type alternators use Zener alternator diodes to suppress high voltages. Revision: 09-Oct-17 1 Document Number: 87542
2 TEST SPECIFICATIONS FOR 12 V POWERTRAINS WITH CENTRALIZED LOAD DUMP SUPPRESSION-TYPE ALTERNATORS Below are test conditions for centralized load dump suppression: PARAMETER VALUE U A /(U N ) 13.5 V U S 65 V U S 87 V U S * As specified by customer R i 0.5 R i ; 4.0 t d 40 ms t d 400 ms T r 10 ms (+0/-5 ms) Pulses 1 pulse: ISO : 2004 PARAMETER U A /(U N ) U A S U S * R i t d T r Pulses VALUE 13.5 V 79 V U S 101 V 35 V 0.5 R i ; ms t d 400 ms 10 ms (+0/-5 ms) 5 pulses at intervals of 1 min Some vehicle manufacturers use other standards to specify suppressed voltage, pulse width, and internal resistance (R i ). Revision: 09-Oct-17 2 Document Number: 87542
3 LOAD DUMP PROTECTION DEVICES FOR CENTRALIZED LOAD DUMP SUPPRESSION POWERTRAINS Guidelines for selecting load dump protection devices for use in vehicles include: 1. The stand-off voltage is more than 24 V for 12 V powertrains, as determined by withstand test or jumper-start test conditions 2. The maximum clamping voltage for ISO : 2004 June 15 at pulse 1, 2a, 2b, 3a, 3b, and 5b, or ISO : 2010 at pulse b, is lower than the target clamping voltage 3. Select the appropriate protection device based on target clamping voltage, input surge voltage, pulse width, and internal resistance (R i ) Most clamping-type protection devices have a clamping ratio, which is the difference in the breakdown voltage and clamping voltage at low and high surge energy conditions. ELECTRICAL CHARACTERISTICS (T A = 25 C, unless otherwise noted) DEVICE TYPE DEVICE MARKING CODE BREAKDOWN V BR (1) AT I T (V) MIN. MAX. TEST CURRENT I T (ma) STAND-OFF V WM (V) REVERSE LEAKAGE AT V WM I R (μa) REVERSE LEAKAGE AT V WM T J = 150 C I D (μa) PEAK PULSE SURGE CURRENT I PPM (2) (A) CLAMPING AT I PPM V C (V) TPSMC24A EMP TPSMC27A EPP TPSMC30A ERP For example, the maximum voltage from a centralized load dump suppression-type alternator generates 54 V at load dump status; however, the maximum allowed input voltage for this circuit is 35 V. The protection device will clamp at a minimum of 19 V from the input voltage, preventing the circuit from malfunctioning. Revision: 09-Oct-17 3 Document Number: 87542
4 CLAMPING CHARACTERISTICS AT ISO PULSE 5b TEST INPUT U S * R I START PEAK CLAMPING PEAK CURRENT CLAMPING OP. TIME V V V A ms TPSMC24A TPSMC27A TPSMC30A Each part number in the TPSMC Series has different maximum clamping voltages at the same surge pulse condition. Revision: 09-Oct-17 4 Document Number: 87542
5 FLOWCHART OF TVS DIODES FOR CENTRAL LOAD DUMP PROTECTION APPLICATIONS Revision: 09-Oct-17 5 Document Number: 87542
6 TVS DIODES WITH MEDIUM CURRENT SURGE CAPABILITY FOR CENTRALIZED LOAD DUMP PROTECTION POWERTRAINS Vishay offers several TVS diode devices for centralized load dump protection powertrains. Most devices have a surge capability of 1500 W to 5000 W. SINGLE PULSE TEST WITH TPC27A, TPSMC27A, 3KASMC24A, AND 5KASMC24A The following graphs show the maximum internal resistance (R i ) at different input surge voltages for these commonly used TVS diodes in single pulse test conditions. MULTIPLE PULSE TEST FOR TPC27A, TPSMC27A, 3KASMC24A, AND 5KASMC24A The following graphs show the maximum internal resistance (R i ) at different input surge voltages for these commonly used TVS diodes in multiple pulse test conditions. Vishay offers a range of low to medium power TVS diodes in high power density miniature packages to protect electronic units in vehicles against load dump surges and transient voltages from motors, ignition circuits, and other transient sources in powertrains. Revision: 09-Oct-17 6 Document Number: 87542
1 of 8 2/7/2014 7:52 AM
1 of 8 2/7/2014 7:52 AM Search Login Register Soo Man (Sweetman) Kim, Vishay -February 07, 2014 Share Tweet 0 Like 0 For many years, the load dump surge condition test for automobiles was defined in the
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Keywords: Automotive, OverVoltage Protectors, High Voltage protector, Automotive Power, High voltage power supply, Load dump protection
Maxim > Design Support > Technical Documents > Application Notes > Automotive > APP 4240 Maxim > Design Support > Technical Documents > Application Notes > Circuit Protection > APP 4240 Maxim > Design
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BYD Microelectronics Co., Ltd. Low Capacitance ESD Protection for High Speed Data The Series is designed to protect high speed data lines from ESD. Its common anode design protects up to four separate
TVW MSOP 04 AD0 Engineering Specification
TVW MSOP 4 AD 1 Scope TVW MSOP 4 AD s are TVS arrays designed to protect power/control lines and high-speed signal lines from overvoltage hazard of Electrostatic Discharge (ESD), Electrical Fast Transients
PESD1IVN-U. 1. General description. 2. Features and benefits. 3. Applications. Quick reference data
15 July 015 Product data sheet 1. General description ElectroStatic Discharge (ESD) protection diode in a small SOT (SC-70) Surface- Mounted Device (SMD) plastic package designed to protect one automotive
ESD9X5VL ESD9X5VL. X x. Transient Voltage Suppressor
Ultra Small Profile, low capacitance Transient Voltage Suppressor Descriptions The is an ESD transient voltage suppression component which provides a very high level of protection for sensitive electronic
TVS Diode Arrays (SPA Diodes)
SP1005 Series 30pF 30kV Bidirectional Discrete TVS RoHS Pb GREEN Description The SP1005 includes back-to-back Zener diodes fabricated in a proprietary silicon avalanche technology to provide protection
WILLAS ELECTRONIC CORP CHANNEL LOW CAPACITANCE ESD PROTECTION DIODES ARRAY DESCRIPTIONS SOT-23-6 FEATURES APPLICATIONS ORDERING INFORMATION
DESCRIPTIONS The SESD099-04AT1 is a 4-channel ultra low capacitance rail clamp ESD protection diodes array. Each channel consists of a pair of ESD diodes that steer positive or negative ESD current to
4-Line BUS-Port ESD Protection
4-Line BUS-Port ESD Protection 5 4 6 2 3 2897 MARKING (example only) 2896 XY Dot = pin marking X = date code Y = type code (see table below) 2932 FEATURES Ultra compact LLP-6M package Low package height
Bidirectional ESD protection diode
11 December 2018 Preliminary data sheet 1. General description 2. Features and benefits 3. Applications 4. Quick reference data Ultra low capacitance bidirectional ElectroStatic Discharge (ESD) protection
ESD4-DFN LOW CAPACITANCE TVS ARRAY PIN CONFIGURATION
LOW CAPACITANCE TVS ARRAY Description The is a multi-line, low capacitance, 7pF @ 2.5V bias transient voltage suppressor array. This device is designed to protect applications such as wireless telecommunication