PIC16F753 datasheet(136/230 Pages) MICROCHIP

136 / 230 page

PIC16F753/HV753

DS40001709C-page 136

 2013-2015 Microchip Technology Inc.

FIGURE 17-2:

SLOPE COMPENSATION TIMING DIAGRAM

17.2

Using the SC Module

The slope compensator input reference voltage should

be set to the target circuit peak current sense voltage.

The slope compensator output voltage starts at the

input reference voltage and should fall at a rate less

than half the target circuit current sense voltage rate of

rise. Therefore, the compensator slope expressed as

volts

per

µs

can

computed

shown

Equation 17-2.

EQUATION 17-1:

For example, when the circuit is using a 1

 current

sense resistor and the peak current is 1A, then the

peak current expressed as a voltage (VREF) is 1V. If

your power supply is running at 1 MHz, then the period

is 1

s. Therefore, the desired slope is:

EQUATION 17-2:

Slope Compensation Trigger

COG or Comparator Output

One Shot Output

Slope Compensation Output

Slope Compensation Reference Voltage

s

------

VREF

-------------

PWM Period (

s 

--------------------------------------------



VREF

-------------

PWM Period (

s 

--------------------------------------------

---

s

---------

0.5V

s



Note: The setting for 0.5V/

s is

SCxISET<3:0> = 6 and SCxRNG = 0.

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