EZ-PD™ CCG7D Automotive USB Type-C and Buck-boost Controller
Dual-port
Functional overview
1.4
Buck-boost controller operation regions
The input-side CSA’s output is compared with the output of the error amplifier to determine the pulse width of
the PWM. PWM block compares the Input voltage and output voltage to determine the buck, boost, and
buck-boost regions. The switching time/period of the four gate drivers (HG1, LG1, HG2, LG2) depends upon the
region in which the block is operating as well as the mode such as DCM or FCCM. The exact Vin vs Vout thresholds
for transitions into and out of each region are adjustable in firmware including the hysteresis.
1.4.1
Buck region operation (VIN >> VBUS)
When the VIN voltage is significantly higher than the required VBUS voltage, CCG7D devices operate in the buck
region. In this region, the boost side FETs are inactivated, with the boost control FET (connected to LG2) turned
off and the boost sync FET (connected to HG2) turned on. The buck side FETs are controlled as a buck converter
with synchronous rectification as shown in Figure 3.
ON
HG1
(Buck
Control)
OFF
ON
LG1
(Buck
Sync)
OFF
ON
LG2
(Boost
Control)
OFF
ON
HG2
(Boost
Sync)
OFF
Inductor
Current
0
t
Figure 3
Buck operation waveforms
Datasheet
10
002-28172 Rev. *N
2023-01-31
INFINEON [ Infineon ]
