EEPROM-Programmable, Quad,
Power-Supply Tracker/Sequencer Circuit
Timing Diagrams (continued)
VTRKEN
BUS VOLTAGE MONITORED THROUGH TRKEN INPUT
GND
IN1 = 2.5V
IN2 = 1.8V
IN3 = 0.9V
IN4 = 0.7V
MONITORED THROUGH SET THRESHOLDS ON IN_ INPUTS
GND
(EEPROM-SELECTABLE)
EEPROM-
SELECTED
SLEW RATE
OUT1 = 2.5V
OUT2 = 1.8V
OUT3 = 0.9V
OUT4 = 0.7V
GND
GND
RESET
GATE
tRESET
Figure 3. Voltage Tracking with Forced Shutdown (IN1 UV Failure)
VTRKEN
EEPROM-
SELECTED
SLEW RATE
(FORCED INTO
QUICK SHUTDOWN
WHEN IN1 FAILS)
ENABLE
SYNCH
OUT1 = 4V
OUT2 = 3V
OUT3 = 2V
OUT4 = 1V
FULL TRK
MIX WITH 2 RAMP
FULL SEQ
MIX WITH 3 RAMP
(FAST SHUTDOWN BIT SET)
Figure 4. Sequencing Ramp Down Diagram
Figure 5. Mixed-Mode Tracking/Sequencing Examples
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