TLE7240SL Datasheet, PDF (12/28 Pages) Infineon Technologies AG – 8 Channel Protected Low-Side Relay Switch

SPI Driver for Enhanced Relay Control
SPIDER - TLE 7240SL
Input and Power Stages
OFF
IN1 ^{Channel 1}
ON
OFF
IN1
LHI
OFF
IN2 Channel 2
ON
OFF
IN2
LHI
OFF
IN3 Channel 3
IN1
I_{IN 1}
ON
OFF
IN3
LHI
OFF
IN4 Channel 4
IN2
IIN 2
ON
OFF
IN4
LHI
IN3
IIN 3
IN4
IIN 4
LHI
LHI
IL H I
OFF
Channel 5
OFF
ON
OFF
IN5
LHI
OFF
Channel 6
OFF
ON
OFF
IN6
LHI
OFF
Channel 7
OFF
ON
OFF
IN7
LHI
OFF
Channel 8
OFF
ON
OFF
IN8
LHI
Figure 4 Input matrix and logic
InputLogic.emf
The current sink to ground ensures that the channels switch off in case of open input pin. The zener diode protects
the input circuit against ESD pulses. After power-on reset, the device enters idle mode (all channel OFF).
5.2.1 Inductive Output Clamp
When switching off inductive loads, the potential at pin OUT rises to V_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.
Data Sheet
12
Rev. 1.1, 2009-04-15