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