1 Features

• Drives external power transistors

• No isolated secondary supply required

• 15.8-V gate drive, 1.5/2.5-A peak source and sink

current

• 3-kVRMS basic isolation

• Up to 25-mW, 5-V 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: 4243-VPK basic isolation per DIN EN

IEC 60747-17 (VDE 0884-17)

– Planned: 3-kVRMS isolation for 1 minute per UL

1577

2 Applications

• Solid State Relays

• Building Automation

• Factory Automation & 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 15.8-V with

1.5/2.5-A peak source/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 5-V 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

over-current 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 over-temperature or over-voltage 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.