Converter tab

The

Converter

tab performs configuration of the general converter parameters.

Control mode

There are two control modes for the buck converter to regulate the output voltage:

• Voltage

  – Regulates the output voltage by using only the output voltage itself.

• Peak Current

  – Regulates the output voltage by using the output voltage and high-side switch current as control parameters.

Schematic diagram parameters

Click the green items on the schematic diagram to edit correspondent parameters: Vin (42V), L (33µH), Iout 2A, Vout (12V), C(118µF).

Input voltage (Vin)

Parameter	Description	Range	Default
Input voltage	Converter input voltage	9-800 V	24 V

Output voltage (Vout)

Parameter	Description	Range	Default
Output voltage	Target converter output voltage	2.5-240 V	5 V
Minimum	Minimum possible value of converter output voltage	2.5-240 V	4 V
Maximum	Maximum possible value of converter output voltage	2.5-240 V	6 V

Output current (Iout)

Parameter	Description	Range	Default
Output current	Target converter output current	0.1-10 A	2 A

Inductance (L)

Parameter	Description	Range	Default
Inductance	Inductance value	0.1 - 1000000 µH	33.0 µH
ESR	Equivalent series resistance of inductor	0.1 - 1000000 mΩ	30 mΩ

Capacitance (C)

Parameter	Description	Range	Default
Capacitance	Capacitance value	0.1 - 1000000 µF	118 µF
ESR	Equivalent series resistance of capacitor	0.1 - 1000000 mΩ	25 mΩ

Sensor

The sensor parameters are available only in PCCM.

Parameter	Description	Range	Default
Current sense gain	Equivalent transducer gain to transform current to voltage (e.g. shunt resistance in ohms)	0.001 - 100 V/A	1 V/A

Control parameters

The

Control parameters

group provides options to enter the required values.

Parameter	Description	Range	Default
Number of phases	Number of converter's interleaving phases	1 - 4	1
Switching freq	Target switching frequency of power switch operation	50000 - 1000000Hz	300000Hz
Control loop divider	Fast control loop frequency divider	1 - 5	1
Time delay	Time expressed in fraction of PWM period to account for the inherent delay introduced by digital implementation: from analog sensing to duty cycle update. Such a delay is taken into account in the phase margin determination.	0 - 10.0	2.00Ts
Control loop freq	Converter sampling frequency	10000 - 1000000Hz	300000Hz
Crossover freq*	Target crossover frequency	2000 - 200000 Hz	10000 Hz
Phase margin*	Target phase margin	10 - 90	50

Note:

*The calculated valid range for theCrossover frequencyand maximum valid value forPhase margindepend on the set of entered parameters. They display in the respective parameter tooltip.

Compensation settings (poles and zeros)

The

Compensation settings (poles and zeros)

are the characteristic of the transfer function of the converter's control system. They can be either calculated automatically or set manually. The compensator type may be Type III (VCM) or Type II (PCCM). The number of poles and zeros aligns correspondingly with the selected Control mode.

Parameter	Range	Default
Pole at origin (Hz)	0 - 1e+09	487.841
Pole 1 (Hz)	0 - 1e+09	4822.877
Pole 2 (Hz) (VCM only)	0 - 1e+09	100000.000
Zero 1 (Hz)	0 - 1e+09	916.445
Zero 2 (Hz) (VCM only)	0 - 1e+09	2250.091

Copy values

– Click this button to copy the compensation settings values.

You can use them in your custom code example for

VCM

:

#define Pole0 487.841
#define Pole1 4822.877
#define Pole2 100000.000
#define Zero1 916.445
#define Zero2 2250.091

or

PCCM

:

#define Pole0 24659.727
#define Pole1 4822.877
#define Zero1 882.364