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TLE5203
3 A DC Motor Driver
DescriptionTLE 5203 is an integrated power bridge with DMOS output stages for driving DC motors.
This motor bridge is optimized for driving DC motors in reversible operation. The internal
protective circuitry in particular ensures that no crossover currents can occur.
Because the free-wheeling diodes are integrated, the external circuitry that is necessary
is reduced to the capacitors on the supply voltage.
The control inputs have TTL/CMOS-compatible levels.
SIEMENS Power Technology
3-A DC Motor Driver
OverviewSPT IC 1)
TLE 5203 TLE 5203
Figure1Pin Configuration (top view)
TLE 5203
Pin Definitions and Functions
Circuit Description
Input CircuitThe control inputs consist of TTL/CMOS-compatible Schmitt triggers with hysteresis.
Buffer amplifiers are driven by these stages and convert the logic signal into the
necessary form for driving the power output stages.
Output StagesThe output stages form a switched H-bridge. Protective circuits make the outputs short-
circuit proof to ground and to the supply voltage throughout the operating range. Positive
and negative voltage spikes, which occur when switching inductive loads, are clamped
by integrated power diodes.
TLE 5203
Monitoring FunctionsAn internal circuit ensures that all output transistors are turned-OFF if the supply voltage
is below the operating range.
A monitoring circuit for each output transistor detects whether the particular transistor is
active and in this case prevents the corresponding source transistor (sink transistor) from
conducting in sink operation (source operation). Therefore no crossover currents can
occur. Pulse-width operation is possible up to a maximum switching frequency of 1kHz
for any load.
Depending on the load current higher frequencies are possible.
Protective FunctionVarious errors like short-circuit to +VS, ground or across the load are detected. All faults
result in turn-OFF of the output stages after a delay of 40ms and setting of the error flag
EF to ground. Changing the inputs resets the error flag.
Output Shorted to Ground DetectionIf a high side transistor is switched on and its output is shorted to ground, the output
current is limited to typ 8 A. After a delay of 40 ms all outputs will be switched off and the
error flag EF is set to ground.
Functional Truth Table
Notes for Output Stage
TLE 5203
Output Shorted to + VS and Overload DetectionAn internal circuit detects if the current through the low side transistor is higher than 4A
typ. In this case all outputs are turned off after 40 ms and the error flag EF is set to
ground.
At a junction temperature higher than 160°C the thermal shutdown turns off, all four
output stages commonly and the error flag is set without a delay.
Open Load DetectionThe output Q1 has a 10 kW pull-up resistor and the output Q2 has a 10 kW pull-down
resistor. If E1 and E2 are high, all output power stages are turned-OFF. In case of no
load between Q1 and Q2 the output voltage Q1 is VS and Q2 is ground. This state will
be detected by two comparators and an error flag will be set after a delay time of 40 ms.
Changing the inputs resets the error flip flop.
Diagnosis
TLE 5203
Figure2Simplified Schematic for Open Load Detection
Figure3Block Diagram
TLE 5203During overload condition currents higher than 4 A can dynamically occur, before the device shuts off, without
any damaging the device.Depending on load higher frequencies are possible.
Absolute Maximum Ratingsj = – 40 to 150 °C
Voltage
Current
Thermal Resistance
Operating Range
TLE 5203
Electrical CharacteristicsVS = 6 to 18 V; Tj = – 40 to 150 °C
General
Logic
TLE 5203Values for RDSON are for t > 100 ms after applying + VS.
Outputs
Electrical Characteristics (cont’d)VS = 6 to 18 V; Tj = – 40 to 150 °C
