ISL6144IVZA-T Intersil, ISL6144IVZA-T Datasheet - Page 25

• Manufacturer Part Number: ISL6144IVZA-T
• Description: IC CTRLR MOSFET HV ORING 16TSSOP
• Manufacturer: Intersil

Specifications of ISL6144IVZA-T

• Applications: Telecom/Datacom Systems
• Fet Type: N-Channel
• Number Of Outputs: 1
• Internal Switch(s): No
• Delay Time - On: 1ms
• Delay Time - Off: 250ns
• Voltage - Supply: 10 V ~ 75 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -

PCB Layout Considerations
The ISL6144EVAL1Z uses a 4 layer PCB with 1oz external
layers and 2oz internal layers, dedicated ground and power
planes are used to insure good efficiency and EMC
performance. Other layer stack-up and thickness is possible
depending on the particular power system.
The power traces are designed to handle at least 20A of
load per feed. Power and ground planes are made of 2oz
copper and external signal/power layers are 1oz copper.
The loop area for all power traces is minimized to reduce
parasitic inductance.
A ground island can be created under the IC and connected
to the power ground at a single point for reduction of noise
that may be injected from the power ground into the IC
ground.
Component Selection Summary
Component selection is listed for one feed and is applicable
for all other parallel feeds.
R
threshold voltage used in the high speed turn-off. The sum of
R1+ R2 ≅ 50kΩ. R1 and R2 are found using Equation 17.
R
LED1 is not used. FAULT is an open drain that can be used
to interface with an optocoupler, LED or directly to a logic
circuit. This resistor is not populated on the EVAL board.
R
to have an LED current of about 4mA.
C
HVREF pins, this capacitor is necessary to stabilize the
HV
Increasing this value will result in gate turn-on time increase.
C
COMP pins to provide filtering and decoupling. A 10nF
capacitor is adequate for most cases.
C
help immunize the pins against transients that might result in
case of fast speed gate turn-off.
Q
MOSFETs depends on device r
losses and junction temperature of the ORing MOSFETs.
U3 - is Intersil’s ISL6144 High Voltage ORing MOSFET
Controller IC.
LED1 - is a red LED used to indicate first feed faults. When
V
LED1 will be red.
List of Test Points and Connectors
V
1
3
4
1
2
5
IN
IN
1
, R
, C
-Q
REF(VZ)
- is a pull-up resistor on the FAULT pin that can be used if
- is the FAULT pin LED current limit resistor, R4 is chosen
- is the HVREF Capacitor, placed between VIN and
- is the COMP Capacitor, Placed between VOUT and
1 is off while V
1 - J4
3
2
6
- are ORing MOSFET(s), number of paralleled
- are resistors that define the HS comparator
- are VIN and VOUT local decoupling capacitors,
supply and a value of 150nF is sufficient.
OUT
and auxiliary 5V supply are present
25
DS(ON)
, maximum allowable
ISL6144
SOURCE1 - TP1, TP17
DRAIN1 - TP2, TP18
GATE1 - TP13
HVREF1 - TP9
COMP1 - TP11
VSET1 - TP10
FAULT1 - TP3
V
SOURCE2 - TP4, TP21
DRAIN2 - TP5, TP22
GATE2 - TP14
HVREF2 - TP8
COMP2 -TP12
VSET2 - TP7
FAULT2 - TP6
V
AUX PS)
GND - J3, J6, J8, TP24-TP27
V+5V - (AUX PS for LEDs) - J1
IN
OUT
2 - J7
- J2 and J5 (connect to J1 when V
OUT
replace LED
January 6, 2011
FN9131.6