April 23, 2019
transphormusa.com
TDHBG1200DC100_0v1
4
TDHBG1200DC100 User Guide
(a)
Buck mode
(b)
Boost mode
Figure 4. Supply and load connections for buck (a) and boost (b) configurations
Figure 5 shows possible configurations for the gate-drive signals. In Figure 5(a), a single input from an external signal source is
used together with the on-board pulse generation circuit. J4 is used, J6 is left open circuit. Jumpers JP1 and JP2 are in the top
position, as shown. If the high-side transistor is to be the active switch (e.g. buck mode), then the duty cycle of the input source
should simply be set to the desired duty cycle (D). If the low-side transistor is to be the active switch (e.g. boost mode) the duty
cycle of the input source should be set to (1-D), where D is the desired duty cycle of the low-side switch. This configuration
results in synchronous rectification. If it is desired to let the device carrying the freewheeling current act as a diode, then the
appropriate jumper should be placed so that the pull-down resistor is connected to the driver. Figure 5(b) shows a buck-mode
TP65H070LDG
TP65H070LSG
TP65H070LDG
TP65H070LSG
