ISL6140/41EVAL1 Intersil, ISL6140/41EVAL1 Datasheet - Page 4

• Manufacturer Part Number: ISL6140/41EVAL1
• Description: EVALUATION BOARD NEG ISL6140/41
• Manufacturer: Intersil
• Type: Hot-Swap Controllerr

Specifications of ISL6140/41EVAL1

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: ISL6140, 6141
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

NOTE: The Fault LED is not compatible with the ISL6150/51; it will
always be on as long as the input power supply is on. The jumper
should be disconnected if the ISL6150 or ISL6151 is being
evaluated. In addition, one of the loads may need to be switched on
for the “ON” LEDs to respond properly to OV or UV.
Other Notes:
Current Monitoring: There are several ways to monitor load
currents. A voltmeter can be placed across the R1 sense
resistor, to calculate the current (I = V/R; R = 0.27 ohms).
For more for detailed measurements, a current probe
connected to an oscilloscope can be used. First, place all of
the load switches in the “No Load” position. Add a wire loop
2. All Power off.
3. Connect the gray wire to GND (or most positive voltage);
4. Plug the 3 boards together; from left to right, should be
5. Turn on supplies to -48V. The FETs should turn on,
6. A simple check for UV (Under-Voltage) and OV (Over-
7. Switch on Loads: At 48V, SW11 by itself should give
8. Disconnect the BUS board from the CONTROL/LOAD;
9. Disconnect the BUS/CONTROL from the LOAD; now plug
connect the -VINA (violet) and -VINB (blue) wire(s) to the
negative 48V supply (or the most negative voltage).
BUS, CONTROL, and LOAD (those labels should be
upright, facing the user). Set the switches on the LOAD
board to the “No Load” position.
switching the -VIN voltages to -VOUT; the A ON and B
ON LED(s) on the LOAD board should be on. Power
supply current (if monitored) should be approximately
8mA.
Voltage) can be done with a variable power supply. From
the -48V normal start, increase the voltage to >-54V; the
FETs and “ON” LEDs should turn off, until the voltage is
lowered (There should be about one volt of hysteresis).
Similarly, bring the voltage to <-37V to turn off the FETs
and LEDs; again, there is some hysteresis to turn them
back on. The ISL6141/51 should have about 4 volts of
hysteresis. The ISL40/50 should have about 1V of
hysteresis.
~80mA of current; SW12 by itself should give ~160mA of
current. Both together should give ~240mA, which will
exceed the preset Over-Current level (0.05V/0.27Ω =
185 mA). The FET should turn off, the A/B ON LED
should go off, the Fault LED should turn on. Use a scope
to monitor the GATE response for the Over-Current
shutdown. The ISL6140/50 will turn off the FET
immediately (~2uS). The ISL6141/51 will pull the GATE
down to ~4V and regulate the current for approximately
600uS before turning off the FET. To return to normal
operation, un-switch one or both load resistors, and press
and release SW1 (which pulls down on the UV pin, to
reset the internal fault latch).
now plug it back in; this simulates a hot plug board being
inserted into a live connector. The FETs should turn on in
a controlled manner, based on the gate timing
components.
it back in; this simulates a load being plugged into a
powered hot plug on the motherboard.
4
between -VOUTA (or -VOUTB) to an external load and then
back to GND. The load resistors can also be used; just
connect the wire loop from -VOUT to one of the load
resistor’s terminals closest to the switch. Now the load
current will flow through the wire loop, and can be monitored.
Note that the LED current (~1mA) will not be included in the
current loop; but if it interferes with a “zero” current condition,
then just un-solder the R13 resistor, in order to disconnect it.
Alternate sense resistor: The R1 sense resistor on the board
is 0.27 ohm; this sets the Over-Current shutdown at 185mA.
This was done primarily to allow reasonably sized load
resistors to be used for initial demonstrations. However, the
IC and the boards are certainly capable of switching much
higher currents, as long as the user supplies his own
external load (the Q1 IRF530 FET, for example, is rated up
to 17A). Therefore, an R1_alt of 0.02Ω is also supplied on
the board for each channel. Un-solder R1 and solder R1_alt
in its place. This will set the Over-Current shutdown at I =
V/R = 50mV/0.02Ω = 2.5 Amps. Similarly, the user can
supply his own alternate value to set the trip point wherever
he wants to. Keep in mind that the power supply must also
be rated to handle the higher load current.
Over-Voltage is set to 54V to protect the load resistors; the
R4,R5,R6 values can be changed for other loads. A more
typical value for OV is around 71V, the high end of the range
for a 48V supply application. See the ISL6140 and ISL6141
data sheets for more details on how to select the resistors.
There are many test pins that can be used for meter or
oscilloscope probes. Discrete components might even be
soldered to them, if necessary. See the various “Board
Labels” section.
Additional or alternative loads can be externally connected
to the LOAD board.
Individual components can be un-soldered and replaced
with alternative values, if desired.
There are many optional components that can be soldered
in, as desired (see “Optional Components” section).
Be sure the external components are properly rated for the
application voltage; this is especially true for input or output
capacitors, for example; they should be rated for 100V, if the
full voltage range will be used.
The fault LED is intended for display purposes; the
implementation used is not necessarily a satisfactory
solution for a production design. Aside from being useful
only with the ISL6140/41, the brightness varies greatly with
the supply voltage. If the signal is to be used as a logic
output, as well as drive an LED, then the voltage level must
also be compatible with the signal it drives (the jumper JP1
disconnects the LED from the pin, to separate the functions).
The present circuit also clamps the output voltage; a 3V
zener diode was included to make the clamp voltage around
4.5V, compatible with most logic levels. Finally, the LED