Siemens TLE4214G Datasheet

Intelligent Double Low-Side Switch 2 x 0.5 A

Features

● Double low-side switch, 2 x 0.5 A

● Power limitation

● Overtemperature shutdown

● Overvoltage shutdown

● Status monitoring

● Shorted-load protection

● Integrated clamp diodes

● Temperature range – 40 to 125 °C

TLE 4214 G

Bipolar IC

P-DSO-20-7

Type Ordering Code Package

TLE 4214 G Q67000-A9094 P-DSO-20-7 (SMD)

Application

Applications in automotive electronics require intelligent power switches activated by logic signals, which are shorted-load protected and provide error feedback.

This IC contains two of these power switches (low-side switches). In case of inductive loads the integrated clamp diodes clamp the discharging voltage. If a “high” signal is applied to the enable input both switches can be activated independently of one another with TTL signals at the control inputs (active high). The high impedance inputs should always be connected to a fixed potential (noise immunity).

The status output (open collector) signals the following malfunctions with high potential:

● Overload,

● Open load,

● Shorted load to ground,

● Overvoltage,

● Overtemperature.

Semiconductor Group 294 10.96

Pin Configuration

(top view)

TLE 4214 G

Semiconductor Group 295

TLE 4214 G

Pin Definitions and Functions Pin No. Symbol Function

6, 16 GND Ground Design wiring for the max.

short-circuit current (2 x 1 A)

10 IN2 Control input 2 (TTL compatible) activates the output

transistor 2 in case of high potential

Supply voltageIn case of overvoltage at this pin large sections of the circuit are deactivated. The status output indicates this malfunction without delay time.

7Q2Output 2 Shorted load protected, open collector

output for currents up to 0.5 A, with clamping diodes to supply voltage.

5Q1Output 1 Shorted load protected, open collector

output for currents up to 0.5 A, with clamping diodes to

supply voltage. 9 ENA Enable input, active high 1 IN1 Control input 1 (TTL-compatible) activates output

transistor 1 in case of high potential 15 STA Status output (open collector) for both outputs;

indicates overtemperature, overload, open load and

shorted load to ground as well as overvoltage at pin 3.

It is switched to high after a defined delay time in case

of malfunction (except: overvoltage) 3, 4, 8, 11 … 14,

N. C. Not connected

17…20

Semiconductor Group 296

TLE 4214 G

Block Diagram

Semiconductor Group 297

TLE 4214 G

Circuit Description Input Circuits

The control inputs and the enable input consist of TTL-compatible Schmitt triggers with hysteresis. Controlled by these stages the buffer amplifiers drive the NPN power transistors.

Switching Stages

The output stages consist of 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 diodes.

Monitoring and Protective Functions

During the activated status the outputs are monitored for open load, overload, and shorted load to ground (see table below). In addition, large sections of the circuit are shut down in case of excessive supply voltages

. Linked via OR gate the information

regarding these malfunctions effects the status output (open collector, active high). 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. If overload occurs, the outputs are protected according to the safe operating area (SOA) mode (see diagram). If voltage and current are outside the SOA, the outputs oscillate to reduce the power dissipation. The switching frequency depends on the internal delay time and the external load (inductances and capacitances). If the frequency is low, the status output may follow the oscillation. An integrated reverse diode protects the supply voltage

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. At supply voltages below the operating range the output stages are de-activated.

Semiconductor Group 298

+ 11 hidden pages