SLVAFG5 November   2022 TPS929240-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Device Overview
    2. 1.2 BCI Test Method
  4. 2PCB Design Recommendation
    1. 2.1 Schematic Design
    2. 2.2 Layout Design
  5. 3BCI Test
    1. 3.1 Test Set-up
    2. 3.2 Test Results
  6. 4Summary
  7. 5References

3.2 Test Results

The TPS929240-Q1 operates at two modes during the BCI test. Test mode I is animation which refers to output channels are enabled in turn with maximum output current (100mA) and 100% PWM duty cycle. Test mode II is fail-safe state which refers to all output channels are always enabled with maximum output current (100mA) and 100% PWM duty cycle.

Test results summary is shown in Table 3-1

The maximum supply current(A) deviation is:

(1.062 – 0.901 ) / 1.062 = 15% < ±20%

Meanwhile no visible flicker was observed during the test. Notice that during switching between CW modulation (for calibration) and AM modulation, due to the configuration of test software, there can be visible flicker. But normally this test condition does not happen in a real application.

Table 3-1 BCI Test Results
Monitoring Parameters Acceptance Test Results Pass
Supply current Changes < ±20% 15% Y
LED No flicker No flicker Y

In conclusion, the TPS929240-Q1 evaluation board passes the BCI test with function class A result. The detailed descriptions of function definition are shown in Table 3-2.

Table 3-2 BCI Test Function Definition
Class General Definition
A All functions of a device or system perform as designed during and after exposure to a disturbance.
B All functions of a device or system perform as designed during exposure; however, one or more of them can go beyond the specified tolerance. All functions return automatically to within normal limits after exposure is removed. Memory function shall remain Class A.
C One or more functions of a device or system do not perform as designed during exposure but return automatically to normal operation after exposure is removed.
D One or more functions of a device or system do not perform as designed during exposure and do not return to normal operation until exposure is removed and the device or system is reset by a simple operator or use action.
E One or more functions of a device or system so not perform as designed during and after exposure and cannot be returned to proper operation without repairing or replacing the device or system.