DM300023 Microchip Technology, DM300023 Datasheet - Page 42

• Manufacturer Part Number: DM300023
• Description: KIT DEMO DSPICDEM SMPS BUCK
• Manufacturer: Microchip Technology
• Series: dsPIC™r

Specifications of DM300023

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 2, Non-Isolated
• Voltage - Input: 7 ~ 15V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: dsPIC30F2020
• Processor To Be Evaluated: dsPIC30F202x/1010
• Interface Type: RS-232
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Output: -
• Power - Output: -
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

dsPICDEM™ SMPS Buck Development Board
FIGURE 4-1:
DS70181A-page 38
Soft Start Routine
Routine
Start
Soft
Initialization Routines:
• Peripherals – ADC, PWM, Timers, GPIO, etc.
• Variables – PID Gain Terms, Data Buffers
• Constants – Desired Voltage, Current Limit, etc.
• Interrupts – ADC, Timers
• Set Soft Start Flag
• System Stabilization
Idle Loop Functions:
• Check V
• Check Soft Start Flag
• Check/Reset Fault Timers and Flags
• Perform non-critical functions here (e.g. user
application tasks)
SMPS DEMONSTRATION PROGRAM FLOW CHART
The demonstration program requires no manual preparation except to connect 9V
power to the board. You can verify the VOUT1 and VOUT2 voltage levels by measuring
them at the output terminals (J1 and J3, respectively).
If you installed the software that came on the dsPICDEM™ SMPS Buck Development
Board CD, the demonstration program source code is located in the following folder on
your PC.
C:\Program Files\Microchip\Sync Buck Board\Firmware\DualBuck
Instructions for programming the dsPIC30F2020 are provided in the Readme file that
is included in the DualBuck folder. Chapter 3 also describes how to program the
dsPIC30F2020 using the ICD 2. Figure 4-1 illustrates the program flow of the
demonstration program.
Yes
IN
Fault Condition
Soft Start
START
Active
Does
Exist
Is
?
?
No
No
Fault-Check Routine
Yes
Outputs
Disable
ADC Interrupt Routines:
• Measure V
• Calculate PID Gain Parameters
• Update PWM Duty Cycle
© 2006 Microchip Technology Inc.
ADC Interrupt
OUT
END