Technical Brief 457
ISL6116 (+5V) Figures (Continued)
I CR = 1.5A
Ch3PGOOD
Ch3 PGOOD
Ch1 +5V OUT
Ch4 I OUT
Ch1 GATE
Ch4 I LOAD
Ch2 CTIM
Ch2CTIM
FIGURE 5A. RESPONSE TO OC DURING OPERATION
ISL6116 (-12V)
Figures 6 and 7 show the ISL6116 reconfigured for -12V low
side switch application. The following components were
removed: RG1, R6 & R11. C2 was added (0.047μf 0805
size). In Figure 8, notice that GATE is 0V to fully enhance the
FET because of -12V operation. Also note that PGOOD is
disabled due to low side configuration. Upon power up,
current regulation mode is entered and CTIM is immediately
ISL6116 (-12V) Figures
FIGURE 5B. RESPONSE TO FALSE FAULT EVENT
FIGURE 5.
begins charging. The nominal time-out period is CTIM x
93k ? , and again PGOOD is disabled (see Figure 9). An OC
event occurs when the current through the sense resistor
exceeds the user programmed OC threshold (see data
sheet). The controller enters CR mode and capacitor CTIM
begins charging. The nominal time-out period is CTIM x
93k ? (see Figure 10).
HI J2
LOAD
J3 LO
Q2
R1
-12V APPL.
J4
GND
J1
+VBUS
C1
R7
R2
-VBUS
-12V*
REMOVE:
RG1, R6, R11
ADD C2
C3
ISL6116
U1
C2
LOGIN
TP9
R8
R10
D2
DD1
3.3V
R5
R9
OFF
0-5V
OT1
ON
FIGURE 6. ISL6116EVAL1 NEGATIVE VOLTAGE LOW SIDE
CONTROLLER
3
FIGURE 7. ISL6116 EVAL BOARD PICTURE
TB457.0
April 18, 2006
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