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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

? 5-kVRMS reinforced 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

? AEC Q-100 qualified for automotive applications:

– Temperature grade 1: –40°C to +125°C, TA

? Functional Safety-Capable

– Documentation available to aid functional safety

system design

? Safety-related certifications

– Planned: 7070-VPK reinforced isolation per DIN

EN IEC 60747-17 (VDE 0884-17)

– Planned: 5-kVRMS isolation for 1 minute per UL

1577

2 Applications

? Solid State Relays

? Battery Management System

? Onboard Charger

? Hybrid, Electric & Power Train Systems

? Building Automation

? Factory Automation & Control

3 Description

The TPSI3100-Q1 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-Q1 generates its

own secondary bias supply from power received on

its primary side, so no isolated secondary supply bias

is required. The TPSI3100-Q1 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-Q1 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-Q1 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-Q1 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-Q1 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.