Intelligent Double Low-Side Switch 2
×
2 A
TLE 4211
Bipolar IC
Features
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Double low-side switch, 2 x 2 A
Power limitation
Overtemperature shutdown
Status monitoring
Shorted-load protection
Reverse polarity protection
Integrated clamp Z-Diodes
Voltage proof up to 70 V
Temperature range – 40 to 125
°C
P-TO220-7-1
Type
TLE 4211
Application
Ordering Code
Q67000-A8118
Package
P-TO220-7-1
Applications in automotive electronics require intelligent power switches activated by
logic signals, which are shorted-load protected and provide error feedback.
The IC contains two of these power switches (low-side switch). In case of inductive loads
the integrated power Z-diodes clamp the discharging voltage.
With TTL signals at the control inputs (active low) both switches can be activated
independently of one another. If one of the inputs is not in use, it must be applied to high
potential.
The status output (open collector) signals the following malfunctions through low
potential:
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Overload,
Open load,
Output shorted to ground,
Overvoltage.
Semiconductor Group
1
10.96
TLE 4211
Pin Configuration
(top view)
Semiconductor Group
2
TLE 4211
Pin Definitions and Functions
Pin No.
1
Symbol Function
STA
Status output (open collector)
for both outputs; indicates overload, open load and shorted load to
ground as well as overvoltage at pin 7. In case of malfunction the
status output is switched to low after a delay time (except
overvoltage).
Control input 1 (TTL-compatible)
activates output transistor 1 in case of low-potential.
Output 1
Shorted-load protected, open collector output with 36 V clamp
Z-diode to ground.
Ground
Wiring must be designed for a max. short-circuit current (2 x 3.5 A).
Output 2
Shorted-load protected, open collector output with 36 V clamp
Z-diode to ground.
Control input 2 (TTL-compatible)
activates output transistor 2 in case of low-potential.
Supply voltage
In case of overvoltage at this pin large sections of the circuit are
deactivated. The status output indicates the malfunction without
delay time.
2
3
IN1
Q1
4
5
GND
Q2
6
7
IN2
V
S
Semiconductor Group
3
TLE 4211
Block Diagram
Semiconductor Group
4
TLE 4211
Circuit Description
Input Circuits
The control inputs comprise TTL-compatible Schmitt triggers with hysteresis. Driven by
these stages the inverting buffer amplifiers convert the logic signal for driving the NPN
power transistors.
Switching Stages
The output stages comprise NPN power transistors with open collectors. Since the
protective circuit allocated to each stage limits the power dissipation, the outputs are
shorted-load protected to the supply voltage throughout the entire operating range.
Positive voltage peaks, which occur during the switching of inductive loads, are limited
by the integrated clamp Z-diodes.
Monitoring and Protective Functions
The outputs are monitored for open load, overload, and shorted output to ground (see
table below).
In addition, large sections of the circuit are de-activated in case of
excessive supply voltages
V
S
. Linked via OR gate the information regarding these
malfunctions effects the status output (open collector, active low). An internally
determined delay time applied to all malfunctions but overvoltage prevents the output of
messages in case of short-term malfunctions. Furthermore, a temperature protection
circuit prevents thermal overload. An integrated reverse diode protects the supply
voltage
V
S
against reverse polarities. Similarly the load circuit is protected against
reverse polarities within the limits established by the maximum ratings (no shorted load
at the same time!). At supply voltages below the operating range an undervoltage
detector ensures that neither the status nor the outputs are activated.
Status Output (L = Error)
Undervoltage
Operating Range
Overvoltage
V
I
= L
(active)
Normal function
Overload
Open load
Shorted output to ground
H
H
H
H
H
L
L
L
V
I
= H
(passive)
H
H
H
L
L
L
L
L
Semiconductor Group
5
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