ISL6146 Datasheet, PDF (18/23 Pages) Intersil Corporation – Low Voltage ORing FET Controller

ISL6146
ISL6146 Evaluation Platforms
Description and Use of the Evaluation Boards
The three ISL6146 evaluation boards are to demonstrate the four
application configurations discussed earlier. All the boards have
ADJ shorted to VOUT with the PCB layout having the component
footprints to insert a resistor of choice between ADJ and GND to
adjust the HS COMP Vth. Likewise, the VIN is connected to BIAS
but these can be separated to provide an adequate BIAS voltage
when ORing <3V supplies or if providing a separate from VIN
voltage to BIAS.
The ISL6146AEVAL1Z is configured as having a 8.5V minimum
turn-on threshold with a 1.2V hysteresis.
The ISL6146BEVAL1Z is configured as a minimally featured
maximum performance ORing FET controller for 3V to 20V.
The ISL6146CEVAL1Z is configured to operate with a 10.8V lower
turn on threshold and 14.9V upper turn-off threshold.
All three boards are equipped with 50A capable FETs for high
current evaluations and with a minimum of V_IN and V_OUT bulk
capacitance likely to be found in any power system design.
After determining the BIAS source along with V_IN voltage criteria
and configuring the evaluation board if necessary for the
application to be evaluated the board is ready for power.
Apply the BIAS voltage first (via the test points labeled BIAS), if
separate from VIN, then the V_IN voltage. Monitor the provided
test points for device performance with current loads up to 50A.
Figures 46 through 51 illustrate the three ISL6146 evaluation
boards for the three typical applications in photograph and
schematic form.
Figure 52 shows an external voltage switchover circuit as would
be used with an external DC supply up to 24V. This circuit uses a
P-channel FET driven from the FLT output. Since the ISL6146 FLT
output is not a simple status output, the P-FET will be turned off
when any of the FLT conditions exist on the ISL6146.
FIGURE 46. ISL6146AEVAL1Z PHOTOGRAPH
FIGURE 47. ISL6146AEVAL1Z SCHEMATIC
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FN7667.0
December 16, 2011