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ZY8105 5A DC-DC Intelligent POL
8V to 14V Input ? 0.5V to 5.5V Output
Data Sheet
R/W-0
LR2
R/W-0
LR1
R/W-0
LR0
R/W-1
TCE
R/W-1
CLS3
R/W-0
CLS2
R/W-1
CLS1
R/W-1
CLS0
Bit 7
Bit 7:5 LR[2:0] , Load regulation configuration
000: 0 V/A/Ohm
001: 0.39 V/A/Ohm
010: 0.78 V/A/Ohm
011: 1.18 V/A/Ohm
100: 1.57 V/A/Ohm
101: 1.96 V/A/Ohm
110: 2.35 V/A/Ohm
111: 2.75 V/A/Ohm
Bit 0
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
Bit 4
TCE , Temperature compensation enable
0: disabled
1: enabled
Bit 3:0 CLS[3:0] , Current limit setting
0h: corresponds to 37%
1h: corresponds to 47%
…
Bh: corresponds to 140%
Values higher than Bh are translated to Bh (140%)
Figure 30. Fault Management Window
Figure 28. Current Limit Setpoint Register CLS
R/W-0
TRE
R/W-1
PVE
R/W-0
TRP
R/W-0
OTP
R/W-0
OCP
R/W-0
UVP
R/W-1
OVP
R/W-1
PVP
U
U
U
R/W-0
R/W-1
R/W-0
R/W-0
R/W-0
Bit 7
Bit 0
---
Bit 7
---
---
PGLL
OVPL1
OVPL0
UVPL1
UVPL0
Bit 0
Bit 7
TRE : Tracking fault enable
1 = enabled
0 = disabled
R = Readable bit
W = Writable bit
U = Unimplemented bit,
Bit 7:5 Unimplemented , read as ‘0’
Bit 4 PGLL : Set Power Good Low Level
1 = 95% of Vo
0 = 90% of Vo (Default)
Bit 3:2 OVPL[1:0] : Set Over Voltage Protection
Level
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
- n = Value at POR reset
Bit 6
Bit 5
PVE : Phase voltage error enable
1 = enabled
0 = disabled
TRP : Tracking fault protection
1 = latching
0 = non latching
read as ‘0’
- n = Value at POR reset
00 = 110% of Vo
01 = 120% of Vo
10 = 130% of Vo (Default)
11 = 130% of Vo
Bit 1:0 UVPL[1:0] : Set Under Voltage Protection Level
00 = 75% of Vo (Default)
01 = 80% of Vo
10 = 85% of Vo
11 = 90% of Vo
Figure 29. Protection Configuration Register PC2
Note that the overvoltage and undervoltage
protection thresholds and Power Good limits are
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
OTP : Overtemperature protection configuration
1 = latching
0 = non latching
OCP : Overcurrent protection configuration
1 = latching
0 = non latching
UVP : Undervoltage protection configuration
1 = latching
0 = non latching
OVP : Overvoltage protection configuration
1 = latching
0 = non latching
PVP : Phase Voltage Protection (Not Active)
1 = latching
0 = non latching
defined as percentages of the output voltage.
Therefore, the absolute levels of the thresholds
change when the output voltage setpoint is changed
either by output voltage adjustment or by margining.
In addition, a user can change type of protections
(latching or non-latching) or disable certain
protections. These settings are programmed in the
GUI Fault Management window shown in Figure 30
or directly via the I 2 C by writing into the PC1 register
shown in Figure 31.
Figure 31. Protection Configuration Register PC1
If the non-latching protection is selected, a POL will
attempt to restart every 130ms until the condition
that triggered the protection is removed. When
restarting, the output voltages follow tracking and
sequencing settings.
If the latching type is selected, a POL will turn off and
stay off. The POL can be turned on after 130ms, if
the condition that caused the fault is removed and
the respective bit in the ST register was cleared, or
the Turn On command was recycled, or the input
voltage was recycled.
ZD-01740 Rev. 1.1, 01-Jul-10
www.power-one.com
Page 17 of 28
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