New ISO standard and old ISO standard are compared

 

New old the remarkable distinction that flings laden test is to cast laden test newly to need 10 pulse 10 minutes, every pulse is removed a minute, if express,1 is shown. And old cast laden test (ISO-7637-2, 2004) the regulation uses a pulse only.

 

Express 1: The pulse of ISO-16750-2 asks

 

10 minutes of test conditions of 10 pulse demonstrated the reliability that casts laden protection parts of an apparatus, this can help circuit design an engineer to bear according to the surge in high temperature environment the parts of an apparatus with ability right choice.

 

Use the TVS series that passes AEC-Q101 attestation to be offerred to 12V system cast laden protection

 

Graph 1 showed cast load to protect Qian of parts of an apparatus to be located in formulary voltage limits, this voltage weaveform has not at standard weaveform. The reason of this one difference is to be in cast the Qian below laden pulse condition the effective voltage limits of parts of an apparatus, if pursue,1 is shown. Graph 2 in the Qian of parts of an apparatus the condition is Us=101V, Ri=1.75ΩWith pulse width Td=400ms.

 

Graph 1: The input of ISO-16750-2 pulse is undee: Pulse 5A, Us =79 V, Td=400 Ms

 

Graph 2: The Qian that SM5S24A rushs down in ISO-16750-2 arteries and veins undee: 5A, 101V Us, Ri= 1.75Ω , Td=400ms

 

Protection of use TVS diode casts the electronic parts below laden condition

 

How to pass in light of now be located in voltage Qian under the biggest input of other electron component in power source manostat or circuit voltage protects parts of an apparatus, do not make the system stops to move again at the same time or cut off the power. In be able to bear or endure below condition of test getting power, protective parts of an apparatus achieves 24V in circuit voltage and last 1 – 10 minute or longer before won’t work.

 

The Qian that casts laden TVS parts of an apparatus because,voltage is met successive Qian the knot during the operation is lukewarm change and rise. Graph 3 with the graph 4 showed use TVS parts of an apparatus is in Us= 79V, Ri= 1.0ΩWith Td=400 Ms (every pulse is removed 1 minute) the first of below the condition 10 pulse is mixed the last Qian undee.

 

Graph 3: SM5S24A the first Qian undee

 

Graph 4: The last Qian of SM5S24A undee

 

Use new test condition, 10 successive pulse affected the surge that casts laden TVS to control capacity, 3 chart place shows following sides.

 

Chart 1

 

Chart 2

 

Chart 3

 

Chart 1 – 3: The SM5S24A of Leiditech is in the function that casts load newly to check a condition to fall. Contain suffixal “M”the curve is to use level of new test condition (ISO-16750-2) many pulse. Contain suffixal “S”the curve is standard of old test condition (ISO-7637-2) the individual pulse of the definition.

 

The proposal solder that in these values are based on standard room temperature and using product data to express, lists dish dimension, but because of,real property is met printed circuit board type, solder dish dimension with temperature condition different.

 

Appendix

 

Cast laden TVS and reference of concern of peak value electricity

 

Another kind of casts laden protection parts of an apparatus method with right choice is the biggest Qian that reference casts laden TVS voltaic function and the Qian that estimate circuit according to the following parameter electric current:

 

● circuit condition

● Ri= 2 Ω

● casts the = 100 V of peak value voltage that the alternator below laden condition outputs

● target Qian voltage = 35 V

= 200 Ms of ● pulse width

● pulse counts = 10 minute 10 pulse

The Qian that ● SM5S24A has 38 A below 10 pulse condition function, qian of its peak value electric current is 32.5 A ((100 V -35 V) / 2 Ω) .