Use the following instructions to
capture the
precharging
current
profile.
- Initially
connect
the EN pin to
GND
by setting J5 jumper at 2-3 position.
- Set the input supply voltage VIN
to 12 V and current limit of 10 A.
- Turn ON the power supply.
- Enable
the LM74912-Q1 device by connecting EN pin to C. Change the J5 jumper setting to
1-2.
- Observe the start-up profile of
charge pump voltage
(VCAP–
VVS),
output
voltage,
HGATE,
and
DGATE.
- Disable
the LM74912-Q1 device by connecting EN pin to GND. Change the J5 jumper setting
to 2-3.
- Observe the shutdown profile of
charge pump voltage
(VCAP–
VVS),
output
voltage,
HGATE,
and
DGATE.
Figure 4-2
shows an example of power-up with EN profile captured on the LM74912Q1EVM
evaluation
board.