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TS13401ULTRT

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
TS13
401
Final Datasheet Rev 1.0
July 21, 2017
13
of
19
Semtech
Heartbeat Functionality
When the switch is off and the heartbeat command sequence has been transmitted, the DATA pin provides a pulse synchronous
with the zero crossings of the AC waveform. A single pulse or “Heartbeat” for each crossing will be present with a pulse width of T
HB
as shown in the figure below. This is useful for monitoring load presence and for evaluating the phase of the AC waveform. To
cancel the heartbeat command, send any other valid command. If a heartbeat command is sent while the switch is on no data will
be sent back, the switch state will remain the same, and the heartbeat command will not be enacted.
Figure 6: Heartbeat Functionality
Power Transfer
When the set power transfer mode command is sent to the device, the PTO pin will be driven from SYSP to SYSM at frequency F
PTO
.
The PTO pin will continue to drive a pulse train until the cancel power transfer mode command is sent. This feature can be used to
drive a charge pump to harvest power from the SW pins. See Figure 8 for a typical configuration.
Over Temperature
In the event of the device reaches temperatures exceeding T
WARN
or T
SD
, status bits 4 or 3 respectively will be set and visible on the
DATA pin (see Table 4). There is also hysteresis T
HYST
built into each trip point. When T
WARN
is reached, functionality of the device will
remain the same and this status is just for user information. When T
SD
is reached, the device will drive the switch off and ignore turn
on commands until the temperature goes below T
SD
-T
HYST
. Since the switch is external, it is important to thermally couple the PAD
to the switch through the PCB layout.
TS13
401
Final Datasheet Rev 1.0
July 21, 2017
14
of
19
Semtech
Inrush Support
A system may present loads to the switch which result in high inrush currents when initially energized, but rapidly decrease to a
lower level. If the inrush level is higher than the switch over-current shutdown, it may be impossible to activate the load. This
device supports an inrush mode to allow the activation of loads with inrush currents on the order of twice their normal operating
current for a short period of time. During the inrush period, the switch over-current shutdown is elevated, allowing current to
build in the load, ensuring actuation. After the inrush event, the over-current threshold can be reduced to a lower level to allow
protection against faults. Figure 7 below illustrates the time-variant peak load current and how the inrush over-current shutdown
threshold can be used to energize a load successfully when the higher inrush current would otherwise have tripped the lower
steady-state over-current threshold. As long as the load current stays within the safe shaded area, the switch will remain closed.
Figure 7: Inrush Waveform
Note that T
IPK
is internally limited to a maximum of N
IR_CYCLES
= 4 cycles (8 current zero-crossings). Therefore T
IPK
is defined as:
,
67
8
9&
!:;
9
<
67
8
If it is desired to limit this period to something less, the normal over-current shutdown threshold may be restored by writing the
command sequence to cancel inrush mode. If the device is used in a DC application, note that T
IPK
will be infinite, so it is critical
that the system controller adjusts this time as required so that the system is not sustained in the load current inrush state
indefinitely. It is recommended that the inrush period be only as long as is required by the load in the system.
Dither Functionality
Dithering is provided as a mode of operation for applications where a single device per system is used. It enables powering the
TS13401 from the AC waveform. The device monitors system voltage and if it is below V
DITHER_ON
, the switch is shut off for
approximately T
DOFF
. This causes energy stored in the inductor to be transferred into the C
SYS
capacitor. When the device is in Dither
mode, this event occurs at T
DRTY
intervals until the system voltage reaches V
DITHER_OFF
.
-12
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08
Load Current (A)
Time (s)
Load Current vs. Time
T
IPK
Inrush Over-Current Shutdown: IOUT
PK
Over-Current Shutdown
Threshold: IOUT
OC
-IOUT
OC
-IOUT
PK
Load Current Inrush
Steady-State
Operation
TS13
401
Final Datasheet Rev 1.0
July 21, 2017
15
of
19
Semtech
Multi-channel Application
In a multi-channel application, dithering is unnecessary when the switch for at least one channel is open and providing power to
the other channels. As long as the device address pins are wired uniquely for each channel, a single pair of GPIO pins on the
microcontroller can control each device by matching the address in the CMD sequence with the hardwired address. If all devices
must be on simultaneously, one device can be configured for dithering mode to maintain system supply.
The SYSP net should be tied to the SYSM net through the C
SYS
capacitor as shown in Figure 8 below. For a single transformer
system, only one is necessary. If additional transformers are used in a given system, then the SYSP and SYSM pins for those TS13401
devices will need an additional C
SYS
capacitor for each additional transformer.
Current limit resistors are needed for each SYSP pin and each SYSM pin as shown below (R
SYSP
and R
SYSM
respectively). These are
typically 100Ω, ¼ W.
As shown below, a pair of GPIO pins can manage the command and control for up to 8 loads as long as each part has a unique
address. The address pins are set using hard wired connections according to the Address Configuration Table shown in Figure 8.
Also note that some devices can be wired in non-latching mode and others in latching mode.
Figure 8: System Block Diagram
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

TS13401ULTRT

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Gate Drivers Neo-Iso Solid State Relay Driver
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