ISL6142/52EVAL1 Intersil, ISL6142/52EVAL1 Datasheet - Page 7

• Manufacturer Part Number: ISL6142/52EVAL1
• Description: EVAL BOARD W/CURRENT MONITOR
• Manufacturer: Intersil

Specifications of ISL6142/52EVAL1

• Main Purpose: Power Management, Hot Swap Controller
• Utilized Ic / Part: ISL6142, 6152
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

Voltage (UV) trip points. Reference the ISL6142/52 data
sheet for more details.
R7, R8, and R9 are used to sense the load current (R7/R8)
and convert the scaled output current (IS
(R9). This voltage will typically be the input signal to an A to
D converter. Reference the Current Monitor section (page 5)
and the ISL6142/52 data sheet for more details.
R10, and D6 create the Over-Current Time-Out fault
indicator. R10 is a pull-up resistor for the open-drain FAULT
output pin which goes active low when the Over-Current
latch is set. The output signal is referenced to V
resistor is connected to the +5VA/B (red) test pin which must
be externally connected to the +5V supply. The R10A/B
resistor is in series with the D6A/B Over-Current fault LED
which is tied to the FAULT pin.
R12, R13, D4, and D5 create a power good red LED fault
indicator for the ISL6142 (L version). R12 sets the LED
current; R13 is just a zero ohm placeholder; D5 is the LED,
and D4 is a 3V zener diode used to clamp the output high
voltage. Note that when the PWRGD open-drain pull-down
output turns on (Power is Good), the fault LED is off. When
the output turns off, the fault LED will turn on. The voltage
would rise to a high value, but the zener and the LED will
clamp it to approximately 4.5V.
SW1A/SW1B are push button switches used to reset the
Over-Current fault latch. When pushed and released the
latch is cleared and a normal start-up sequence is initiated.
SW2A/SW2B are mini toggle switches that are used to drive
the disable pin (DIS) high or low. When the DIS pin floats or
is tied to an external +5V supply (with respect to -V
GATE will be pulled low and the FET will be off. When tied to
-V
(assuming no fault conditions are present). The purpose of
the switch is to demonstrate the functionality of the DIS pin.
A typical application could use an N-channel logic FET and
additional logic circuitry referenced to the negative supply
rail to perform this function. Jumpers JP2A/2B are provided
to allow the user to disconnect the switch and drive the DIS
pin externally. The switch can also be used to reset the
Over-Current latch when toggled high to low. If not used the
pin should be tied to the negative supply rail.
Optional Components
R11 and C4 (channel B only) make an RC filter for the V
pin. It is used to isolate some kinds of system supply noise
from the IC. For example, it may help filter out glitches that
could trigger OV or UV (which shut off the FET) if near their
trip points.
D1 (channel B only) is a voltage suppressor, which can help
protect the board components from transient voltages that
exceed the normal operating range allowed (absolute
maximum is 100V).
IN
, the GATE will be high and the FET will be on
7
(Fig. 7)
OUT
) to a voltage
EE
. The
IN
) the
DD
D2 and D3 (channel B only) may be used to block inductive
transients that might pull the drain pin negative with respect
to the V
(D2), the ISL6152 (H version) uses both diodes. The diodes
have a second effect of offsetting the DRAIN trip points for
the PWRGD/PWRGD output. The default board has one of
the diodes (D2B) shorted out with zero ohms which should
be removed before adding one or two diodes.
Q2 and Q3 are alternate package options for Q1 FETs. Q2 is
an 8-pin SOIC, using a standard pinout (S=1, 2, 3, G=4,
D=5-8). Q3 is an SOT-223 package. Since all three pins of
all three packages are wired in parallel, with no jumpers, it is
recommended that only one of the 3 be populated at any
given time.
R1_alt is an alternate 0.020Ω sense resistor which can be
used to evaluate the device at higher operating currents; if
used instead of R1 (un-solder R1, and solder in R1_alt). This
resistor will produce an Over-Current trip point of 2.5A
(50mV / 0.02Ω). The load resistors supplied with the LOAD
board (in parallel) will only produce about 0.25 Amps of
output current per channel. To trip the Over-Current
threshold of 2.5A, a shorting mechanism or a lower value
external load will be necessary. Keep in mind that the power
supply must also be rated to handle the higher load current.
Also note that if the fault current exceeds the hard fault
threshold of 210mV, the GATE will immediately shutdown
(10uS typical) and a single retry will follow.
D7 is a green LED that can be used as a PWRGD “OK”
indicator, instead of a red fault LED. It should only be used
with the ISL6142. Resistor R12 sets the LED current; the D7
LED replaces R13, and D4 and D5 are disconnected
(remove either one to open circuit).
C5 is a load capacitor that can be placed on the CONTROL
board (in addition to the three cap footprints on the LOAD
board) to demonstrate inrush current control with a
capacitive load for a hot insertion.
BUS Board Labels
• -VINA = J1A, J1B, J1C
• GND = J2A, J2B, J2C
• GND = J3A, J3B, J3C
• -VINB = J4A, J4B, J4C
• C21A = optional input capacitor for -VINA (to GND)
• C21B = optional input capacitor for -VINB (to GND)
Edge Connector Pins (P1)
• Top pins B6, B5, B4 = -VINB
• Top pins B3, B2, B1 = -VINA
• Bottom pins A6 - A1 = GND
• Note that pin A3 is the short pin ground but must be
modified (trace shortened) to ensure this pin is the last
EE
pin. The ISL6142 (L version) uses one diode
(See Fig. 11)