Buck Converter

User-declaration of startup timing periods of the buck converter using physical quantities. More...

Collaboration diagram for Buck Converter:

#define	BUCK_POWER_ON_DELAY   (float) 200e-3
	Global defines for soft-start specific parameters. More...
#define	BUCK_VRAMP_PERIOD   (float) 100e-3
	voltage ramp-up period in [sec] More...
#define	BUCK_IRAMP_PERIOD   (float) 100e-3
	output current ramp-up period in [sec] More...
#define	BUCK_POWER_GOOD_DELAY   (float) 200e-3
	power good delay in [sec] More...

Detailed Description

User-declaration of startup timing periods of the buck converter using physical quantities.

Macro Definition Documentation

BUCK_IRAMP_PERIOD

#define BUCK_IRAMP_PERIOD   (float) 100e-3

output current ramp-up period in [sec]

Definition at line 801 of file dpsk3_hwdescr.h.

BUCK_POWER_GOOD_DELAY

#define BUCK_POWER_GOOD_DELAY   (float) 200e-3

power good delay in [sec]

Definition at line 802 of file dpsk3_hwdescr.h.

BUCK_POWER_ON_DELAY

#define BUCK_POWER_ON_DELAY   (float) 200e-3

Global defines for soft-start specific parameters.

This section is used to define power supply startup timing settings. The soft-start sequence is part of the power controller. It allows to program specific timings for

• Power On Delay
• Ramp Period
• Power Good Delay

After the startup has passed these three timing periods, the power supply is ending up in "normal" operation, continuously regulating the output until a fault is detected or the operating state is changed for any other reason. When the output voltage reference is changed, the power control state machine will use the voltage ramp slope defined here to tune from the recent voltage reference to the new reference value. During this period the BUSY-bit of the power controller (status word, bit #7) will be set. This status bit will be cleared automatically by the power controller state machine once the new reference value has been applied and the converter is back in constant regulation mode.

Pre-compiler macros are used to translate physical values into binary (integer) numbers to be written to SFRs and variables.
(see Buck Converter for details)

Note

On DPSK3 it takes roughly 500 ms until the auxiliary power has been started, the PIC24 housekeeping controller on the bottom side of the board resets the protection logic and allows the dsPIC to run. After this period the dsPIC controller starts to execute its firmware.

This additional startup delay of ~500 ms is not considered in the settings below and needs to be taken into account when adjusting startup timing. Use an independent debugging pin toggle at the beginning of the firmware to verify the specified startup timing is applied as desired. power on delay in [sec]

Definition at line 799 of file dpsk3_hwdescr.h.

BUCK_VRAMP_PERIOD

#define BUCK_VRAMP_PERIOD   (float) 100e-3

voltage ramp-up period in [sec]

Definition at line 800 of file dpsk3_hwdescr.h.