PIC16F753 Datasheet, PDF (146/238 Pages) Microchip Technology – 14/16-Pin, Flash-Based 8-Bit CMOS Microcontrollers

PIC16F753/HV753
FIGURE 17-2:
SLOPE COMPENSATION TIMING DIAGRAM
Slope Compensation Trigger
COG or Comparator Output
One Shot Output
Slope Compensation Reference Voltage
Slope Compensation Output
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 be computed as shown in
Equation 17-2.
EQUATION 17-1:
^--V--s^{- } P^----W^-----M^-------P^-V------e^--R--2--r^--E--i^----o^-F---d^----(^---^----s^---
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:
-_P---_W-----_M-------_PV^-------_e--^R--2--_r--^E--_i----_o-^F---_d-----₍--_----_s---_ = -1---12-_-----s = 0.5V  s
Note: The setting for 0.5V/s is
SCxISET<3:0> = 6 and SCxRNG = 0.
DS40001709A-page 146
Preliminary
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