TLE8080EM Datasheet, PDF (14/39 Pages) Infineon Technologies AG – Engine Management IC for Small Engines

6
Power Stages
TLE8080EM
Power Stages
6.1
Low Side Switches
The power stages are built by N-channel power MOSFET transistors. The channels are universal multi channel
switches, but are mostly suitable to be used in engine management systems. Within an engine management
system, the best fit of the channels to the typical loads is:
• Channel 1 and 3 for injector valves or similar sized solenoids with a maximum operation current requirement
of 2.6A
• Channel 2 for malfunction indication lamps or other resistive loads with a maximum current requirement of 3A
• Channel 4 and 5 for relays or other inductive loads with a maximum current requirement of 350mA
The channels are switched off while reset is active (pin NRO is low). After an power on reset the channels will be
switched on with a positive edge at IN1 respectively IN3 or with a switch on command over SPI.
V bat
V _DScl
OUT
L,
I_D
R_L
V_DS
V bat
R
OUT
ID
VDS
GND
GND
Channel1, 3, 4, 5
Channel2
Figure 6 Low Side Switches
In Table 5 the control concept, typical loads, the implemented protection and monitor functions are illustrated.
Table 5
Channel
Overview Diagnosis Function
Control
Recommended
Load
Over
Over Current
Temperature
1
Pin IN1
Injector Valve
x
Latch¹⁾
2
SPI CMD Register MIL (max. 3W)
x
Bit 0
3
Pin IN3
Valve
x
repetitive switching;
off
time
t ¹⁾
oc,off
Latch¹⁾
4
SPI CMD Register Relay
Bit 1
one
Latch¹⁾
temperature
sensor for
channel 4 and
channel 5
5
SPI CMD Register Relay
Bit 2
one
Latch¹⁾
temperature
sensor for
channel 4 and
channel 5
1)Reset behavior of the diagnosis bits see Chapter 8.2
Open
Load/Short
to GND
x
–
x
x
x
Data Sheet
14
Rev. 1.1, 2012-10-19