TLE7232G datasheet(12/36 Pages) INFINEON

12 / 36 page

SPI Driver for Enhanced Relay Control

SPIDER - TLE 7232G

Block Description and Electrical Characteristics

Data Sheet

V1.0, 2005-09-30

The input signal can be configured to be used as control signal of the output stages for

each channel separately. The channels 0 to 3 differ from the channels 4 to 7 in the

mapping behavior. Please refer to Figure 4 for details.

The current sink to ground at the input pin ensures that the channels switch off in case

of open pin. The zener diode protects the input circuit against ESD pulses.

4.1.3

Inductive Output Clamp

When switching off inductive loads, the potential at pin OUT rises to

DS(CL) potential,

because the inductance intends to continue driving the current. The voltage clamping is

necessary to prevent destruction of the device, see Figure 5 for details. Nevertheless,

the maximum allowed load inductance is limited.

Figure 5

Output Clamp Implementation

Maximum Load Inductance

During demagnetization of inductive loads, energy has to be dissipated in the SPIDER -

TLE 7232G. This energy can be calculated with following equation:

(1)

The equation simplifies under the assumption of

L = 0:

(2)

The energy, which is converted into heat, is limited by the thermal design of the

component.

OutputClamp.emf

Vbat

I D

VDS(CL)

OUT

GND

EVDS(CL)

Vbat V

–

DS(CL)

------------------------------------

⋅

RL ID

⋅

Vbat V

–

DS(CL)

------------------------------------

–







------

⋅⋅

---

LID

Vbat

Vbat V

–

DS(CL)

------------------------------------

–







⋅

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