ISL6111EVAL2 Ver la hoja de datos (PDF) - Renesas Electronics
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ISL6111EVAL2 Datasheet PDF : 16 Pages
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ISL6111
inductance and resistance effects, maximize the width of the
high-current PCB traces.
CORRECT
INCORRECT
grounded. The Fault-not output, FLTN pulls low once the CR
duration has expired and signals that all supplies have been
disconnected from the load. See Figure 3 for operational
PGOOD and FLTN waveforms.
PGOOD / FLTN 5/DIV
TO ISL6111
VS AND VISEN
TO ISL6111
VS AND VISEN
CURRENT
SENSE RESISTOR
5IOUT 5A/DIV CR = 7.2A
5VOUT 2/DIV
FIGURE 2. SENSE RESISTOR PCB LAYOUT
PGOOD vs Power is Good and Fault Signals
Keep in mind that the -12VOUT is not monitored for under
voltage, thus the PGOOD output signal only takes into account
the three positive supplies. PGOOD will assert once all
minimum positive UV criteria is reached and the M12VO may
not be more than a few volts below ground at that time. It will
pull low once any positive voltage < UV Vth. For applications
that don't use -12V, the M12VI pin on the ISL6111 is simply
CRTIM 2V/DIV
20ms/DIV
FIGURE 3. FLTN & PGOOD FUNCTIONAL WAVEFORM
Adjusting the Current Regulation Level
The current regulation level is adjusted by the CRSET
resistance to ground value. The ratio of resistance to CR
change is not linear but is unidirectional in relationship, see
Figures 4-6.
Typical Performance Curves & Waveforms
12
10
85°C
8
3.3V
6 25°C
5V
4
0°C
2
0
3
3.5
4
4.5
R_CRSET (k)
FIGURE 4. 3.3V & 5V SLOWLY INCREASING CURRENT TRIP
LEVEL vs TEMPERATURE AND RCRSET
0.6
85°C
0.5
+12V
0.4
0.3
0°C
25°C
0.2
0.1
-12V
0
3
3.5
4
4.5
R_CRSET (k)
FIGURE 5. +12V & -12V SLOWLY INCREASING CURRENT
TRIP LEVEL vs TEMPERATURE AND RCRSET
FN9146 Rev 1.00
Mar 2004
Page 10 of 16
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