BTS50060-1TEA Datasheet, PDF (13/39 Pages) Infineon Technologies AG – Smart High-Side Power Switch

BTS50060-1TEA
Functional Description
voltage clamp mechanism implemented that keeps the negative output voltage at a certain level (-V_OUT = V_S -
V_SD(CL)). Please refer to Figure 1 and Figure 11 for details.
V_OUT
V_S
ON
OFF
V_SD(CL)
t
I_L
t
SwitchingInductance.emf
Figure 11 Switching an inductance
Nevertheless, the energy capability of the device is limited because the energy is converted into heat. That’s why
the maximum allowed load inductance is limited as well. Please see Figure 4 for limitations of energy and load
inductance.
For calculating the demagnization energy, Equation (1) may be used:
E_A
=
V_SD(CL)
×
--^L----
R_L
×
V_-----S----–_-----V_{----S---D---(--C---L---)}
R_L
×
ln _1
+
-_V----_S---^R_D----₍-^L-_C---^×_L---₎--^I-_–--^L---_V-----_S-_
+
I_L
(1)
The equation can be simplified under the assumption of R_L = 0 Ω to:
E_A
=
1--
2
×
L
×
I_L²
×
-------^V----^S---^D----⁽-^C----^L--⁾-------
V_SD(CL) – V_S
(2)
The BTS50060-1TEA provides Infineon^® SMART CLAMPING functionality. To optimize the energy capability for
single and parallel operation, the clamp voltage V_SD(CL) increases over the junction temperature T_j and load current
I_L. Figure 36 shows the dependency from T_j for the typical V_SD(CL). Please refer also to Figure 14.
5.1.3 Switching a Capacitive Load
A capacitive load’s dominant characteristic is it’s inrush current. The BTS50060-1TEA can support inrush currents
up to I_L(SC). If the inrush current reaches I_L(SC), the device may detect a short circuit and switch OFF. For a
description of the short circuit protection mechanism, please refer to Chapter 5.3.1.
5.1.4 Inverse Load Current Operation
In case of a negative load current, e.g. caused by a load operating as a generator, the device can not block the
current flowing through the intrinsic body diode. See Figure 12. The power stage of the device can be switched
ON or stays ON as long as V_IN = HIGH, reaching the same R_DS(ON) as for positive load currents, if no fault condition
is detected. In case of fault condition, the logic of the device will switch OFF the power stage and supply a fault
signal I_IS(fault). Since the device can not block negative load currents (even under fault conditions), it can not protect
itself from overload condition. In the application, overload conditions, e.g. over temperature, must not occur during
inverse load current operation.
Datasheet
13
High current PROFET^TM
Rev. 1.1, 2011-04-13