RHRPMICL1AD2V datasheet(19/31 Pages) STMICROELECTRONICS

19 / 31 page

Application guidelines

When a floating ground configuration is being operated, it is recommended to protect the application from single

point failures of the resistor RFGND connected between GND and BUS GROUND and the telemetry resistors

(RSTS and RTM). In fact, in case of failure of these resistors, damage may occur to the device itself and to the

other devices connected to the same bus.

The figure below shows a typical implementation of the protection described above.

Figure 9. Recommended typical application schematic with single failure protection

SUPPLY BUS

RSENSE

RHys

RSTS

RTM

RFGND_1

To Load

DFW

UVLO

HYS

T_ON

T_OFF

SET_STATUS

TC_OFF

VCC

ISNS+

TMS+

VOUT/VG

STS

GND

TC_ON

ISNS

TMS

FCL_CFG

OFF

TELECOMMAND

INTERFACE

I_REF

COMP

RIREF

Telecommand

Interface

CORE

LOGIC

UVLO

Power supply section

(Pre-regulator,

reference, bias)

STATUS

Telemetry

VCC

TRIP_OFF

Circuitry

DRIVER

VCC

RFGND_2

BUS GROUND

8.1

Guidelines for operation at high voltage

Even if the device has been tested and characterized in radiation up to VCC = 52 V, from the electrical point of

view, it is able to withstand up to ~ 90 V between BUS_SUPPLY and BUS GROUND.

Nevertheless, it is possible, by adding some external components, to work with a bus supply higher than 90 V, as

described in the following figure.

Under radiation the following application guidelines are recommended for bus supply higher than 52 V.

RHRPMICL1A

Application guidelines

DS12602 - Rev 3

page 19/31

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