T
EE
24V
Rising Edge
Slope
T rigger
50
J1-8
GND
J1-1
IN
1/7
TB1-4
COM
OUT
J2-8
COM
J2-1
50
10x Scope
3UREH³,QSXW´
GND
TB1-2
10x Scope
Probe
³2XWSXW´
3.3 V
Pulse Generator
100 kHz
0V
10% Duty Cycle
TPL7407L
TPL7407LEVM Performance Testing Using Lab Equipment
www.ti.com
Switching Parameter t
PHL
3.3V 50
Ω
Channel 1 Test Setup and Typical Results
Board setup: The TPL7407Land TPL7407LEVM are primarily designed for slow responding loads like
relays, stepper motors, and DC lab equipment; however, the TPL7407Lrise/fall times and propagation
delays are short. Therefore line termination and short wires are important for signal quality. The waveform
below uses a 50 ohm cable “T” tapped within 3 cm of the J1-Input connector and terminated at the
oscilloscope set to 50 ohm input impedance. This input is used as the scope trigger. A locally grounded
10X scope probe is used to measure the input signal and the same probe was used to measure the output
on J2-1. A pull up resistor of 50
Ω
is connected between the output (J2-1) and Relay supply (J2-8). Set
scope trigger for rising edge. Pulse generator is 10% duty cycle 100kHz 3.3V logic level signal.
Figure 9. T
PHL
Schematic
Switching Parameter t
PLH
3.3V 50
Ω
Channel 1 Test Setup and Typical Results
Board setup: The TPL7407Land TPL7407LEVM are primarily designed for slow responding loads like
relays, stepper motors, and DC lab equipment; however, the TPL7407Lrise/fall times and propagation
delays are quite short. Therefore line termination and short wires are important for signal quality. The
waveform below uses a 50 ohm cable “T” tapped within 3 cm of the J1-Input connector and terminated at
the oscilloscope set to 50 ohm input impedance. This input is used as the scope trigger. A locally
grounded 10X scope probe is used to measure the input signal and the same probe was used to measure
the output on J2-1. A pull up resistor of 50
Ω
is connected between the output (J2-1) and Relay supply (J2-
8). Set scope trigger for falling edge. Pulse generator is 10% duty cycle 100kHz 3.3V logic level signal.
12
TPL7407L7-Channel Relay and Inductive Load Sink Driver EVM
SLRU005 – February 2013
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