ZY8110 Power-One, ZY8110 Datasheet - Page 15

• Manufacturer Part Number: ZY8110
• Description: Zy8110 10a Dc-dc Intelligent Pol
• Manufacturer: Power-One

Figure 22. Transient Response with Optimal Voltage
8.2
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
23 or directly via the I
DOF, and TC registers, respectively. The registers
are shown in Figure 24, Figure 25, and Figure 27.
8.2.1
Turn-on delay is defined as an interval from the
application of the Turn-On command until the output
voltage starts ramping up.
ZD-01991 Rev. 1.0
Sequencing and Tracking
Figure 23. Sequencing/Tracking Window
Positioning
Turn-On Delay
2
C bus by writing into the DON,
www.power-one.com
8V to 14V Input
8.2.2
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 26.
Figure 26. Relationship between Turn-Off Delay and Falling
As it can be seen from the figure, the internally
calculated delay T
below.
For proper operation T
The appropriate value of the turn-off delay needs to
be programmed to satisfy the condition.
ZY8110 10A DC-DC Intelligent POL
Bit 7:0 DON[7:0]: Turn-on delay time
Bit 7:6 Unimplemented, read as ‘0’
Bit 5:0 DOF[5:0]: Turn-off delay time
Internal
ramp-down
command
R/W-0
DON7
Bit 7
Turn-Off
Command
Bit 7
---
U
00h: corresponds to 0ms delay after turn-on command has occurred
…
FFh: corresponds to 255ms delay after turn-on command has occurred
00h: corresponds to 0ms delay after turn-off command has occurred
…
3Fh: corresponds to 63ms delay after turn-off command has occurred
V
Slew Rate
OUT
Figure 24. Turn-On Delay Register DON
Figure 25. Turn-Off Delay Register DOF
Turn-Off Delay
R/W-0
DON6
---
U
R/W-0
DON5
R/W-0
DOF5
T
D
Calculated
D
delay T
User programmed turn-off delay, T
=
is determined by the equation
T
•
R/W-0
DON4
R/W-0
DOF4
DF
D
0.5V to 5.5V Output
D
shall be greater than zero.
−
dV
Ramp-down time, T
R/W-0
R/W-0
DON3
DOF3
V
OUT
F
dT
Page 15 of 28
R/W-0
Falling slew
DON2
R/W-0
DOF2
rate dV
,
Data Sheet
F
/dT
F
R/W-0
DON1
R/W-0
DOF1
DF
Time
R/W-0
DON0
R/W-0
DOF0
Bit 0
Bit 0