TLD5541-1QV Datasheet, PDF (50/82 Pages) Infineon Technologies AG – H-Bridge DC/DC Controller with SPI Interface

H-Bridge DC/DC Controller with SPI Interface
TLD5541-1QV
Protection and Diagnostic Functions
10.4
Input current Monitoring
The input current can be monitored through an analog output pin and an SPI routine.
The IINMON pin provides a linear indication of the current flowing through the input. The following Equation (19)
is applicable:
V _IINMON = I _IN ⋅ R _IN ⋅ 20
(19)
Note: If the R_IN value is choosen in a way that the current limitiation is much bigger than the nominal input current
during the application the current measurement becomes inaccurate. Best results for an accurate current
measurement via the V_IINMON pin is to set the current limit only slightly above the specific application related
nominal input current.
Purpose of the input current monitoring routine is to verify if the system is in current limitation.
• The output of the Input Current Sense is compared to the internal precise reference voltage.
• The comparator works like a 2 bit window ADC referred to the internal precise reference voltage.
To execute the current monitor routine the CURRMON.SOMON bit has to be set HIGH and the result is ready
when CURRMON.EOMON is read HIGH.
The result of the input monitor routine is reported on the CURRMON.INCURR bit.
Figure 30 Input Current Monitoring General Overview
10.5
Output current Monitoring
The output current can be monitored through an analog output pin and an SPI routine.
The IOUTMON pin provides a linear indication of the current flowing through the LEDs. The following
Equation (20) is applicable:
V _IOUTMON = 200 mV + I _OUT ⋅ R _FB ⋅ 8
(20)
Purpose of the SPI current monitor routine is to verify if the system is in loop.
• The output of the Led Current Sense is compared to the output of the Analog Dimming DAC
• The comparator works like a 2 bit window ADC around 8 bit DAC output
To execute the current monitor routine the CURRMON.SOMON bit has to be set HIGH and the result is ready
when CURRMON.EOMON is read HIGH.
Data Sheet
50
Rev. 1.0, 2016-05-20