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ZY7007 7A DC-DC Intelligent POL Data Sheet
3V to 14V Input ? 0.5V to 5.5V Output
R/W-0
DON7
R/W-0
DON6
R/W-0
DON5
R/W-0
DON4
R/W-0
DON3
R/W-0
DON2
R/W-0
DON1
R/W-0
DON0
Bit 7
Bit 0
Bit 7:0 DON[7:0] : Turn-on delay time
00h: corresponds to 0ms delay after turn-on command has occurred
…
FFh: corresponds to 255ms delay after turn-on command has occurred
Figure 31. Turn-On Delay Register DON
8.2.2
Turn-Off Delay
U
---
U
---
R/W-0
DOF5
R/W-0
DOF4
R/W-0
DOF3
R/W-0
DOF2
R/W-0
DOF1
R/W-0
DOF0
Bit 7
Bit 7:6 Unimplemented , read as ‘0’
Bit 0
Figure 29. Transient Response with Optimal Voltage
Positioning
Bit 5:0 DOF[5:0] : Turn-off delay time
00h: corresponds to 0ms delay after turn-off command has occurred
…
3Fh: corresponds to 63ms delay after turn-off command has occurred
8.2
Sequencing and Tracking
Figure 32. Turn-Off Delay Register DOF
Turn-on delay, turn-off delay, and rising and falling
output voltage slew rates can be programmed in the
GUI Sequencing/Tracking window shown in Figure
30 or directly via the I 2 C bus by writing into the DON,
DOF, and TC registers, respectively. The registers
are shown in Figure 31, Figure 32, and Figure 34.
Turn-off delay is defined as an interval from the
application of the Turn-Off command until the output
voltage reaches zero (if the falling slew rate is
programmed) or until both high side and low side
switches are turned off (if the slew rate is not
programmed). Therefore, for the slew rate controlled
turn-off the ramp-down time is included in the turn-off
delay as shown in Figure 33.
User programmed turn-off delay, T DF
Turn-Off
Command
Calculated
Figure 30. Sequencing/Tracking Window
Internal
ramp-down
command
V OUT
delay T D
Ramp-down time, T F
Falling slew
rate dV F /dT
Time
8.2.1 Turn-On Delay
Turn-on delay is defined as an interval from the
application of the Turn-On command until the output
voltage starts ramping up.
Figure 33. Relationship between Turn-Off Delay and Falling
Slew Rate
As it can be seen from the figure, the internally
calculated delay T D is determined by the equation
below.
T D ? T DF ?
V OUT
dV F
dT
,
For proper operation T D shall be greater than zero.
The appropriate value of the turn-off delay needs to
be programmed to satisfy the condition.
ZD-00245 Rev. 2.6, 01-Jul-10
www.power-one.com
Page 19 of 35
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