Figure 9-1 Typical System Diagram of Battery Connections for TIC12400-Q1

The TIC12400-Q1 is designed to operate with a 12 V automotive system. Figure 9-1 depicts a typical system diagram to show how the device is connected to the battery. Remember to be careful when connecting the battery directly to the device on the V_S supply pin (through a reverse-blocking diode) or the input (IN_X) pins since an automotive battery can be subjected to various transient and over-voltage events. Manufacturers have independently created standards and test procedures in an effort to prevent sensitive electronics from failing due to these events. Recently, combined efforts are made with ISO to develop the ISO 16750-2 standard (Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 2: Electrical loads), which describe the possible transients that could occur to an automotive battery and specify test methods to simulate them.

It shall be noted that the TIC12400-Q1 is designed and tested according to the ISO 16750-2 standard. A few voltage stress tests and their test conditions are listed below. Exposing the device to more severe transient events than described by the standard could potentially causes performance degradation and long-term damage to the device.

• Direct current supply voltage: V_{BAT, min}= 6 V; V_{BAT, max}= 16 V
• To emulate a jump start event, voltage profile described in Figure 9-2 is used.
  Figure 9-2 Voltage Profile to Test a Jump Start Event
  Table 9-1 Voltage Profile Parameters to Test a Jump Start Event

  Parameter	Value
  VBAT, min	10.8 V
  VBAT, max	24 V
  tr	< 10 ms
  t1	60 s ± 6 s
  tf	< 10 ms
  Number of cycles	1

• To emulate a load dump event for an alternator with centralized load dump suppression, voltage profile described below is used. U_A and U_S* are applied directly to V_BAT.
  Figure 9-3 Voltage Profile to Test a Load Dump Event with Centralized Load Dump Suppression
  Table 9-2 Voltage Profile Used to Test a Load Dump Event With Centralized Load Dump Suppression

  Parameter	Value
  UA	13.5 V
  US	79 V ≤ US ≤ 101
  US*	35 V
  td	40 ms ≤ td ≤ 400 ms
  tr	< 10 ms
  Number of cycles	5 pulses at intervals of 1 min

• To emulate a cranking event, voltage profile describe below is used. U_S, U_S6, and U_A are applied directly to V_BAT.
  Figure 9-4 Voltage Profile to Test a Cranking Event
  Table 9-3 Voltage Profile Used to Test a Cranking Event

  Parameter	Value - Level I	Value - Level II	Value - Level IV
  US6	8 V	4.5 V	6 V
  US	9.5 V	6.5 V	6.5 V
  UB	14 V ± 0.2 V	14 V ± 0.2 V	14 V ± 0.2 V
  tf	5 ms ± 0.5 ms	5 ms ± 0.5 ms	5 ms ± 0.5 ms
  t6	15 ms ± 1.5 ms	15 ms ± 1.5 ms	15 ms ± 1.5 ms
  t7	50 ms ± 5 ms	50 ms ± 5 ms	50 ms ± 5 ms
  t8	1000 ms ± 100 ms	10000 ms ± 1000 ms	10000 ms ± 1000 ms
  tr	40 ms ± 4 ms	100 ms ± 10 ms	100 ms ± 10 ms