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TPL7407LPWR データシート(PDF) 9 Page - Texas Instruments

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部品番号 TPL7407LPWR
部品情報  TPL7407L 40-V 7-Channel Low Side Driver
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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TPL7407LPWR データシート(HTML) 9 Page - Texas Instruments

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TPL7407L
www.ti.com
SLRS066D – JANUARY 2014 – REVISED MARCH 2016
Product Folder Links: TPL7407L
Submit Documentation Feedback
Copyright © 2014–2016, Texas Instruments Incorporated
Typical Application (continued)
8.2.1.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 1. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
GPIO Voltage
1.8 V, 3.3 V or 5.0 V
Coil Supply Voltage
8.5 V to 40 V
Number of Channels
7
Output Current (RCOIL)
20 mA to 300 mA per channel
CCOM
0.1 µF
Duty Cycle
100%
8.2.1.2 Detailed Design Procedure
When using TPL7407L in a coil driving application, determine the following:
Input Voltage Range
Temperature Range
Output & Drive Current
Power Dissipation
8.2.1.2.1
TTL and other Logic Inputs
TPL7407L input interface is specified for standard 1.8 V through 5 V CMOS logic interface and can tolerate up to
30 V. At any input voltage the output drivers will be driven at it's maximum when Vcom is greater than or equal to
8.5 V.
8.2.1.2.2
Input RC Snubber
TPL7407L features an input RC snubber that helps prevent spurious switching in noisy environments. Connect
an external 1 k
Ω to 5 kΩ resistor in series with the input to further enhance TPL7407L’s noise tolerance.
8.2.1.2.3
High-impedance Input Drivers
TPL7407L features a 1-M
Ω input pull-down resistor. The presence of this resistor allows the input drivers to be
tri-stated. When a high-impedance driver is connected to a channel input the TPL7407L detects the channel
input as a low level input and remains in the OFF position. The input RC snubber helps improve noise tolerance
when input drivers are in the high-impedance state.
8.2.1.2.4
Drive Current
The coil current is determined by the coil voltage (VSUP), coil resistance & output low voltage (VOL).
ICOIL= (VSUP - VOL)/RCOIL
(1)
8.2.1.2.5
Output Low Voltage
The output low voltage (VOL) is drain to source (VDS) voltage of the output NMOS transistors when the input is
driven high and it is sinking current and can be determined by Specifications or Figure 1.
8.2.1.3 Application Curves
The following curve was generated with TPL7407L driving an OMRON G5NB relay -- Vin = 5.0 V; Vsup = 24 V &
RCOIL = 2.8 kΩ


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