RHRPMICL1AD2V datasheet(13/31 Pages) STMICROELECTRONICS

13 / 31 page

The trip-off time TON, as well as the recovery time TOFF, can be externally set through the external capacitors CON

and COFF respectively connected between the pins TON / TOFF and GND, as shown in the application diagram

with the RHRPMICL1A configured as a re-triggerable current limiter (Figure 5. Typical application diagram with

the RHRPMICL1A configured as re-triggerable current limiter). The capacitor COFF is charged with a constant

current whose value is a fraction (1/20) of IREF (externally set by the resistor RIR connected between the I_REF

pin and GND). The COFF charging phase of capacitor COFF starts as soon as the TON time has elapsed, therefore

the TOFF time is equal to the charging time of capacitor COFF defined by:

TOFF=20×RIR×COFF

(5)

For safety reasons the capacitor COFF is quickly discharged. TOFF is generated not only after a current limitation

event whose duration is greater than the TON time, but also after any event that turns off the device.

When the device is configured as a re-triggerable current limiter, the following settings are recommended:

- to select the option ON at power-up, connecting the SET_STS pin to VCC

- to disable the telecommand interface, connecting the TC_ON and TC_OFF pins to VCC

Figure 5. Typical application diagram with the RHRPMICL1A configured as re-triggerable current limiter

RHRPMICL1A

HYS

UVLO

TC_ON

TC_OFF

TMS+

ISNS+

ISNS

TMS

COMP

STS

SET_STS

SET_FLB

RETRIGGERABLE

CONFIGURATION

LOAD

BUS SUPPLY

BUS GROUND

Note:

The resistors RGND, RSTS and RTM are critical for the safety of the application. Please refer to Section

8 Application guidelines.

7.2.3

Foldback mode

The device can be configured as a foldback current limiter through the configuration pin SET_FLB (see

Figure 6. Typical application diagram with the RHRPMICL1A configured as foldback current limiter).

Table 9. Foldback mode setting

SET_FLB

Mode

GND

Foldback mode disabled

VCC

Foldback mode enabled

RHRPMICL1A

Modes of operation

DS12602 - Rev 3

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