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TS13103 数据表(PDF) 9 Page - Semtech Corporation

部件名 TS13103
功能描述  Solid State Relay with Diagnostics
Download  16 Pages
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制造商  SEMTECH [Semtech Corporation]
网页  http://www.semtech.com
标志 SEMTECH - Semtech Corporation

TS13103 数据表(HTML) 9 Page - Semtech Corporation

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TS13103
Final Datasheet Rev 2.1
28 July 2016
9 of 16
Semtech
Proprietary & Confidential
Latching Configuration
The Switch can be configured for latching or non-latching functionality via external interconnect. When the WD pin is tied to
VDD, the Switch state is latched after each command (CMD) sequence. When the WD pin is tied to an RC circuit, the device is
configured for non-latching behavior. If a CMD sequence is not received before the WD pin voltage decays to WDTO, the Switch
will be turned off. A CMD sequence received by the device before the WD pin voltage decays to WDTO will cause the WD pin to
recharge to WDRC, and the switch will remain closed. In order to recharge, the CMD address must be for the corresponding
device address configuration. Typical waveforms for non-latching behavior are shown below.
Figure 3: Latching Functionality
The time between the last CMD sequence and the switch opening (in a non-latching configuration) can be computed by the
following equation:
= −
ln
Where:
tOFF is the time from the last CMD sequence until the switch opens
RWD is the WD pin resistor
CWD is the WD pin capacitor
WDTO is the WD pin turn-off voltage threshold
WDRC is the WD pin re-charge voltage
It should be noted that the WD capacitor, CWD, is recommended to be 22nF. The reason for this is that charge proportional to CWD
is drawn from the CSYS capacitor in every re-charge cycle, thereby elevating the average current, and forcing the device to switch
off more frequently in order to re-charge CSYS (see Dither Functionality, below). CWD can be made smaller, but this will necessitate
a larger value of RWD to be used to define a given tOFF time. RWD has its practical limits due to leakage within the components
attached to the WD pin and possible leakage on the circuit board due to contamination. The system designer should consider all
these issues when selecting RWD and CWD. Device 2 in Figure 5 shows RWD and CWD being used to create a non-latching channel.
Device 1 is shown in latching mode.
Dither Functionality
Dithering is provided as a mode of operation for applications where a single device per system is used. It enables powering the
TS13103 from the AC waveform. The device monitors the system voltage, (VSYSP-VSYSM), and if it falls below VDON, the Switch is shut
off for approximately TDOFF. This causes energy stored in the load to be transferred into the CSYS capacitor. When the device is in
dither mode, this event occurs at TDRTY intervals until the system voltage reaches VDOFF.


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