BTF50060-1TEA_11 Datasheet, PDF (22/38 Pages) Infineon Technologies AG – Smart High-Side Power Switch, One Channel

BTF50060-1TEA
For definition of k_IS, the following Equation (6) is used:
Functional Description
k_IS
=
-------------^I---^L---¹--^–----^I--^L----²-------------
I_IS(I_L1)–I_IS(I_L2)
(6)
I_L1 and I_L2 are two different load currents, I_IS(IL1) and I_IS(IL2) are the corresponding sense currents.
5.4.2 Enhancing Accuracy of the Sense Output by End of Line Calibration
For some applications it may be necessary to measure the load current with very high accuracy. To increase the
device accuracy, different methods can be used, e.g. single point calibration or dual point calibration.
The variance of the sense current at a certain load current depends on the variance of the factor k_IS as well as on
the variance of the offset current I_IS(OFFSET). The temperature variance of the factor k_IS over the temperature range
is described with the parameter Δk_IS,Temp.
Δk_IS(Temp) = max[ k_IS(–40°C) – k_IS(25°C) ; k_IS(150°C) – k_IS(25°C) ]
(7)
The variance of the sense current offset over the temperature range is defined as shown in Equation (8):
ΔI_IS(OFFSET) = max[ I_IS(OFFSET)(–40°C) – I_IS(OFFSET)(25°C) ; I_IS(OFFSET)(150°C) – I_IS(OFFSET)(25°C) ]
(8)
5.4.3 Short-to-Battery detection / Open Load Detection in OFF state
The BTF50060-1TEA provides open load diagnosis in OFF state. This is achieved by monitoring the OUT voltage.
The open load at OFF diagnosis is activated if V_IN = LOW for t > t_RESET. An open load or short-to-battery is detected
if V_OUT > V_OUT(OLH). To provoke this condition during Open Load, it may be necessary to use an external pull up
resistor R_OL (see Figure 46). In case of detecting a shorted load to battery, open load, or inverse operation in OFF
state, the pin IS provides a defined fault current I_IS(fault). If V_OUT drops below V_OUT(OLL), or V_IN is set to HIGH, the
fault signal is removed. Figure 23 shows the behavior of the open load at OFF diagnosis. Figure 43 and
Figure 44 provide the typical behavior of V_OUT(OLH) and V_OUT(OLL) as a function of the supply voltage and junction
temperature. The device internally connects OUT with GND pin with an effective resistor R_OUT(GND). In case the
application provides high leakage current outside of the BTF50060-1TEA between Vs and OUT, it may be
necessary to use an external resistor R_{L_OL} to disable open load detection. Figure 46 gives an example of external
circuitry for enabling / disabling open load detection in OFF state.
Datasheet
Speed PROFET^TM
22
Rev. 1.2, 2011-09-01