ISL6118EVAL1 Intersil, ISL6118EVAL1 Datasheet - Page 22

• Manufacturer Part Number: ISL6118EVAL1
• Description: EVALUATION PLATFORM FOR ISL6118
• Manufacturer: Intersil

Specifications of ISL6118EVAL1

• Main Purpose: Power Management, Hot Swap Controller
• Utilized Ic / Part: ISL6118
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

Setting the Overcurrent Trip Point
Setting Hot Plug Over Current Trip Points
In general, Intersil hot plug devices sense load current
through a sense resistor, then compare the voltage
generated across this sense resistor to a voltage
programmed via a “set” resistor
Steps to Set OC Trip Point: (Steps may vary slightly by
part)
HIP1012A, ISL6115, ISL6116 Devices
To set HIP1012A, ISL6115, and ISL6116 CR levels, use the
equation:
With:
Or
For PCI Applications:
Set R
level 110%-130% higher than maximum specified PCI range
For Non-PCI Applications:
Do NOT use R
Do select R
R
1. Select desired OC trip point level
2. Determine R
3. Calculate R
ISENSE
design to
CRSET
R
R
ILIM
ISET
=
RESISTOR (kΩ)
CRSET
--------- -
I
RESISTOR (Ω)
V
to 4.22kΩ, which provides a nominal current trip
OC
th
4.99k
4.99
2.5k
10k
750
7.5
CRSET
15
10
ISENSE
ISET
> 3.0kΩ to avoid noise faults
V
V
by selecting sense threshold voltage to
> 15kΩ (thermal considerations)
th
th
ISL6115, ISL6116
based on OC level selected in step 1
=
=
HIP1012A
R
R
ISET
ISET
22
•
•
10µA
20µA
NOMINAL OC VTH (mV)
NOMINAL OC VTH (mV)
200
100
150
100
50
15
75
50
Technical Brief 457
ISL6173 (+3.3V and +2.5V)
To set ISL6173 CR level, use the equation:
Where:
ISL6118
The ISL6118 current sense and limiting circuitry sets the
current limit to a nominal 600mA.
I
I
SET
CR
FIGURE 67. CURRENT REGULATION vs V
FIGURE 68. CURRENT REGULATION vs V
SUPPLY
=
(V I
=
700
650
600
550
500
700
650
600
550
500
+3.3
+5.0
+12
-12
(
-------------------------------------- -
I
I
------------ - and I
CR
SET
REF
4
)
I
1.25
SNS
•
R
1.3 1.5
SET
((100µA x R
((100µA x R
(100µA x R
(100µA x R
1.50
I
REF
REF
NOMINAL CURRENT REGULATION LEVEL
)
=
=
1.75
2.0
V
----------------------- -
R
(
25°C
typically 80µA
OCREF
OCREF
(10%) FOR EACH SUPPLY
CRSET
CRSET
CRSET
CRSET
2.00
2.5
-40°C
V
-40°C
V
85°C
25°C
85°C
OUT
OUT
)/0.7
)/3.3
)/8.54)/R
)/12)/R
2.25
3.0
(V)
(V)
RSENSE
)
2.50
3.5
RSENSE
OUT
OUT
2.75
4.0
(V
(V
IN
IN
April 18, 2006
= 3.3V)
3.00
4.5
= 5V)
TB457.0
4.8