STPM098C datasheet(15/110 Pages) STMICROELECTRONICS

15 / 110 page

Note:

1. VREF1 ≤ VREF1_uv_th (max) + VREF1_uv_hyst (max)

VREF1 is in undervoltage and STPM098C is sent into RESET state. Internal registers are under reset.

2. VREF1_uv_th ≤ VREF1 ≤ VREF1_ov_th

Internal registers are out of reset (if no LTC faults are detected the device status depends on VR1_EN/

VR2_EN status).

3. VREF1_ov_th ≤ VREF1

VREF1 is in overvoltage and STPM098C sent into RESET state. Internal registers are out of reset.

3.1.2.2

VREF1 thermal-overload monitor

VREF1 load level is monitored by means of dedicated OT (overtemperature) diagnosis. Hysteresis on thresholds

and filtering time are implemented.

If Tj (output stage) ≥ VREF1_ot_th occurs for an interval longer than T_ vref1_ot_flt, VREF1_EN is asserted low

and the VREF1 regulator is disabled. The VREF1 regulator remains disabled until the failure condition is

removed.

Table 10. VREF1 thermal-overload monitor electrical characteristics

Symbol

Parameter

Test

condition

Min Typ Max Unit

Notes

VREF1_ot_th

VREF1 overtemperature threshold

175 190 215

°C

Comparator output low to

high

VREF1_ot_hys VREF1 overtemperature hysteresis

°C

T_vref1_ot_flt

VREF1 overtemperature detection filter

time

μs

Analog filter

Figure 9. VREF1 thermal-overload behavior

VREF1_EN

(Internal Signal)

Thermal Shutdown

VREF1_OT_TH

VREF1_OT_HYST

TVREF1_OT_flt

Operative

TVREF1_OT_flt

STPM098C

Functional description

DS14440 - Rev 1

page 15/110

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