AN4461 datasheet(56/70 Pages) STMICROELECTRONICS

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User interface

AN4461

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DocID026130 Rev 2

9.3.10

hb - configure half-bridge frequency and status

This command lets the user activate/deactivate the resonant stage and manually configure

the half-bridge operating frequency. To manually activate the half-bridge use “hb 1", to

deactivate use “hb 0" or select the half-bridge on-time use “hb 46-650”.

The total half-bridge switching period is given by Equation 20:

Equation 20

Switching period = 2* (val + LEB time + deadtime) + 52 ns

where:

val = configured via “hb”

LEB time = 250 ns

deadtime = configured via “hf”

Syntax: hf [val]

Parameters:

•

val [0,1,46-650]: the new switching frequency or resonant status.

–

0: switches off the half-bridge

–

1: enables the half-bridge

–

46 - 640: Select the on-time. The on-time value is calculated as val * 10.4 ns.

–

Output: none

Default: At startup the on-time value is set to 635 ns (val = 61), the deadtime is 344 ns and

the LEB time is 250 ns. Therefore, the initial switching frequency is ~400 KHz.

Example: “hf 0": switches off the resonant stage.

9.3.11

pf - configure PFC voltage and status

The command is used to activate (“pf 1"), deactivate (“pf 0") the PFC or change the PFC

output voltage. The output voltage can be configured between 390 V (val = 875) and 410 V

(val = 920) and. The default value is 920 (410 V).

If the PFC is disabled (“pf 0") and resonant is enabled then the output current is not correctly

regulated.

Caution:

It is strongly suggested to avoid manually switching off the PFC stage while the HB is

operating.

Command “pf 2" puts the STLUX into the IDLE mode (only if the resonant stage is off: use

“hb 0"). Normal operations can be restored only by pushing the DALI button (SW2) or when

the board receives a DALI command.

Syntax: pf [val]

Parameters:

•

val [0,1,2,875-920]:

–

0: switch off the PFC

–

1: enable the PFC

–

2: enter IDLE mode

–

875-920: configure desired PFC output voltage (875 = 390 V, 920 = 410 V)

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