1 Features
• Drives external power switches (MOSFETs, IGBTs,
SiC FETs, SCRs)
• Integrated bias supply, no isolated secondary
supply required
• 17V gate drive, 1.5A and 2.5A peak source and
sink current
• 3kVRMS basic isolation
• Up to 25mW, 5V supply for external auxiliary
circuitry
• Dual isolated high-speed comparators with
integrated voltage reference ±1.5%
• Open-drain outputs for fault and alarm indicators
• –40°C to +125°C, TA
• Functional Safety-Capable
– Documentation available to aid functional safety
system design
• Safety-related certifications
– Planned: 4243VPK basic isolation per DIN EN
IEC 60747-17 (VDE 0884-17)
– Planned: 3kVRMS isolation for 1 minute per UL
1577

2 Applications
• Solid state relays
• Building automation
• Factory automation and control

3 Description
The TPSI3100 is a fully integrated isolated switch
driver, which when combined with an external power
switch, forms a complete isolated solid state relay
solution. With a gate drive voltage of 17V with 1.5A
and 2.5A peak source and sink current, a large
availability of power switches can be used to meet
many application needs. The TPSI3100 generates
its own secondary bias supply from power received
on its primary side, so no isolated secondary supply
bias is required. The TPSI3100 provides additional
power via the nominal 5V rail (VDDM) for use by
auxiliary circuits to perform various function such as
current and voltage monitoring or remote temperature
detection. The TPSI3100 isolation is extremely robust
with much higher reliability, lower power consumption,
and increased temperature ranges than those found
using traditional mechanical relays and optocouplers.
The TPSI3100 integrates a communication backchannel
that transfers status information from the
secondary side to the primary side via open-drain
outputs, PGOOD (Power Good), FLT1 (Fault 1), and
ALM1 (Alarm 1). Dual high-speed comparators with
an integrated shared voltage reference are used
to assert FLT1 and ALM1. When the comparator
input, FLT1_CMP, exceeds the voltage reference, the
driver is immediately asserted low and FLT1 is also
driven low, indicating to the system that a fault has
occurred. This is useful for disabling the external
switch with low latency on critical events, such as
overcurrent detection. When the comparator input,
ALM1_CMP, exceeds the voltage reference, ALM1
signal is asserted low, but no action is taken by the
driver. This may be useful as an alarm or warning
indicator for overtemperature or overvoltage events.
The TPSI310xL series offers a latch based fault
indicator. When a fault is detected, the driver and the
fault indicator are asserted low and remain latched,
until EN is asserted low. The TPSI310x series has
a non-latched fault indicator. If the fault event is no
longer present, FLT1 deasserts and the driver, after
a specified recovery period, follows the state of the
EN pin. If the fault event still remains, both the fault
indicator and the driver remain asserted low.