GDU init as follwing:
void initGDU(void)
{
GDUE_GCPE = 1; // charge pump
GDUE_GCSE0 = 1; // enable Current Sense Amplifier 0
GDUF = 0xff; // Flag Register - clear all error flags
GDUBCL = 0x0F; // Set coil current limit to maximum 750mA
GDUCLK1_GBOCD = 0b10001; // Set boost frequency ~ 0.52MHz
GDUCLK1_GBODC = 0b11; // Set duty cycle to 75%
GDUE_GBOE = 1; // Enable boost
GDUCLK2_GCPCD = 2; // Fbus / 32
GDUCTR = 0x93;//0x13; // blanking time
GDUDSLVL = 0x77; // desat. level
GDUE_GFDE = 1; // enable FET pre-driver
GDUDSE = 0x77; // Clear Desaturation Error Flags
}
The Schematic like this,
I use Oscilloscope test CP pins, the output single like this
I set Frequence = 0.52MHz, but output Frequence is 0.39MHz, the duty i set is 75%, but the output is 50%.
so i want to know how to correct it.
Thank you Very much.
