STPM098C datasheet(60/110 Pages) STMICROELECTRONICS

60 / 110 page

Following:

ILOAD= ADrMOS±ACCALL Σi=1N 1ΔIOUTadclsb ISENi−VREF1CFILT 1±Gerr ±VOFS

=ADrMOS Σi=1N 1ΔIOUTadclsb ISENi−VREF1CFILT ± ACCALLΣi=1N 1ΔIOUTadclsb ISENi−VREF1CFILT + ADrMOS+ACCALL

Σi=1N 1ΔIOUTadclsb ISENi−VREF1CFILTGerr + NVOFS

ΔIOUTadclsb

ILOADERROR=± ACCALL Σi=1N 1ΔIOUTadclsb ISENi−VREF1CFILT + ADrMOS+ACCALL

Σi=1N 1ΔIOUTadclsb ISENi−VREF1CFILTGerr + NVOFS

ΔIOUTadclsb

(16)

3.12.3.1

Output current monitor (IOUT monitor)

Single phase and sum current levels are monitored by means of a multiple sets of dedicated diagnosis.

Single phase undercurrent diagnosis (phase fault)

A dedicated UC monitoring on single phase current conversion is performed to detect the condition.

If |ISENn-CFILT/VREF1| ≤ IOUTm_uc_th occurs for an interval longer than T_iout_uc_detect_dly, the IOUTn_UC

flag is set and SAFE_HIZ is established. Fault pins are asserted LOW according to FHC configuration and FOR

table [n = 1, 2, 3, 4, 5, 6, 7, 8] and [m = 1, 2].

The reference thresholds for the IOUTn undercurrent monitor unit IOUTn_uc_th can be separately configured for

loop 1 and 2 through dedicated PMBus™ registers as follows:

IOUTmUCTH=IOUTMONUCtℎlsb×IOUTmUCFAULTLIMIT7:0

(17)

Where:

IOUT_MON_UC_th_lsb is the minimum voltage step [0.293 mV].

IOUTm_UC_FAULT_LIMIT [7:0] is the dedicated PMBus™ configuration bits [0 ~ 75 mV].

The default value is IOUTm_UC_ FAULT_LIMIT = 0x33 (15 mV).

In the case IOUTm_UC_ FAULT_LIMIT = 0x00 the related undercurrent monitor function is disabled, and no

detection is performed.

The absolute value of the maximum input voltage slew rate detectable by the IOUT monitor is given by

IOUT_adc_lsb/IOUT_adc_latency.

Figure 48. Output undercurrent monitor timing - Diagram 1

|ISENn-CFILT/VREF1|

IOUTn_UC

(Internal signal)

T_iout_uc_detect_dly

OPERATIVE

IOUTn_UC_TH

IOUT_adc_rise_fall_diff_sr

T_iout_uc_detect_dly

STPM098C

Functional description

DS14440 - Rev 1

page 60/110

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