SLIS187C Data sheet

SLIS187C June 2021 – March 2022 TLC6A598

PRODUCTION DATA

Package Options

Mechanical Data (Package|Pins)

DW|24
- MPDS174A

Thermal pad, mechanical data (Package|Pins)

Orderable Information

8.3.7 Clamping Structure

When switching off inductive loads, the potential at pin OUT rises to VDS(CL) potential, because the inductance intends to continue driving the current. The clamping voltage is necessary to prevent destruction of the device. See Figure 8-1 for the clamping circuit principle. Nevertheless, the maximum allowed load inductance is limited.

Figure 8-1 Output Clamp Implementation

During demagnetization of inductive loads, energy has to be dissipated in the TLC6A598. This energy can be calculated with Equation 1:

Equation 1.

E = V_{D S (C L)} \times (\frac{V_{b a t} - V_{D S (C L)}}{R_{L}} \times l n (1 - \frac{R_{L} \times I_{L}}{V_{b a t} - V_{D S (C L)}}) + I_{L}) \times \frac{L}{I_{L}}

The Equation 2 simplifies under the assumption of R_L = 0:

Equation 2.

E = \frac{1}{2} \times L \times {I_{L}}^{2} \times (1 - \frac{V_{b a t}}{V_{b a t} - V_{D S (C L)}})

The thermal design of the component limits the maximum energy, which is converted into heat.