Technical Brief 457
ISL6111 (+12V, -12V, +3.3V, +5V) Figures (Continued)
CH4 I LOAD3.3V
CH3 3VG
+5VI CR = 1A
+3.3VI CR = 5A
+12VI CR = 650mA
-12VI CR = 140mA
CH2 CRTIM
CH1 +3.3VOUT
FIGURE 60. TURN ON INTO SHORT ON +3.3V
ISL6118 (+5V x2)
Figures 61 and 62 show the ISL6118 dual power supply
controller. This IC provides fully independent OC fault
protection for the +2.5V to +5.5V environment, with
integrated MOSFETs. For ease of testing, EN1 and EN2
were tied together on this board.
Refer to Figures 63 and 64. After EN is asserted, notice the
soft-start ramp of both outputs to VIN, in this case +5V. Also
ISL6118 (+5V x2) Figures
C2
R1
notice that FAULT2 is only an indicator of an OC timeout,
thus is not an indicator of under voltage conditions.
Figure 65 shows an OC condition occurring through
channel 2 of the IC. Note that channel 1 stays up regardless
of the condition of channel 2. Figure 66 shows turning on
into an OC condition on channel 2. Again, channel 1 is
unaffected.
D2
R6
D3
R8
C1
1
FAULT_OUT1 8
R4
C3
TP2
(VIN)
2
VIN
OUT1 7
TP7
ISL6118
TP6
TP3
3
EN1
OUT2 6
R2
TP4
4 EN2 FAULT_OUT2 5
D4
R9
D1
R7
SW1
R5
C4
TP9
F1
TP10
R3
D5
FIGURE 61. EVAL BOARD SCHEMATIC
20
R10
FIGURE 62. EVAL BOARD PICTURE
TB457.0
April 18, 2006
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