AN4461 datasheet(49/70 Pages) STMICROELECTRONICS

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AN4461

User interface

9.3.2

st - status

The command reports the actual demonstration board status. This command reports all the

main internal variables, flags and the status of the board. The values are reported as

sampled when the “st” command is executed.

Syntax: st

Parameters:

none

Output:

PSR-ZVS status is 0:2

Vin Vi = 677 Vp = 695 Vmin = 30 Vmax = 695 freq = 99

PFC st = 0x1 Vo = 903 S0 = 51 S3 = 124 maxon = 480 I = 8

HB st = 0x3 Z = 0 S0 = 33 S3 = 445 dt = 30 O0 L = 569 H = 569

PW2 ta = 3450 re = 3446 now = 3450 O1:0 dump = 37 ndump = 0 tz = 0x25

Table 15. Status information

Line Parameter

Description

Unit conversion

The first line (PSR-ZVS) reports the last error value

“0” in the example is the last error; “2” is last total number of errors

starting from power on or form last reset.

Vin

The second line reports the AC input voltage.

Actual AC voltage

V =

Vi * 0.448 V

AC peak voltage during the last half wave AC cycle.

V =

Vp * 0.448 V

Vmin

Minimum input voltage during the last half wave AC cycle.

V =

Vmin * 0.448 V

Vmax

Maximum input voltage during the last half wave AC cycle .

V =

Vmax * 0.448 V

freq

Shows the input semi-sinusoidal period in units of 100

µS. In the

example “freq = 99" is equal to 99 * 100 mS = 9.9 mS, i.e. ~100 Hz (or

~50 Hz full-wave).

T =

freq * 100

µS

PFC

The third line report the PFC status

This parameter is a bit mask and each bit reports several PFC

information:

Bit

Value Description

Running

Disabled

Overcurrent detected.

IDLE mode not selected.

IDLE mode selected.

Note: during the IDLE mode the serial line is not available

therefore the bit can be read by executing the command

“st” within 200 ms after using command “pf 2".

Stable PFC output.

PFC ready but generic error condition detected.

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