X
X
R
R
P
P
7
7
7
7
0
0
8
8
a
a
n
n
d
d
X
X
R
R
P
P
7
7
7
7
4
4
0
0
Q
Q
u
u
a
a
d
d
C
C
h
h
a
a
n
n
n
n
e
e
l
l
D
D
i
i
g
g
i
i
t
t
a
a
l
l
P
P
W
W
M
M
S
S
t
t
e
e
p
p
D
D
o
o
w
w
n
n
C
C
o
o
n
n
t
t
r
r
o
o
l
l
l
l
e
e
r
r
s
s
?2012 Exar Corporation
16/28
Rev. 1.2.2
OUTPUT VOLTAGE SETTING AND MONITORING
The Output Voltage setting is controlled by the SET_VOUT_TARGET_CHx register. This register
allows the user to set the output voltage with a resolution of 50mV for output voltages between 0
and 2.5V and with a resolution of 100mV for output voltages between 2.6V and 5.1V. Output
voltages higher than 5.1V can be achieved by adding an external voltage divider network. The
output voltage of a particular channel can be read back using the READ_VOUTx register.
Output Voltage from 0.9V to 5.1V
Per the equation below, for values between 0.9V and 5.1V the output voltage is equal to the binary
number stored in the SET_VOUT_TARGET_CHx register multiplied by 50mV. When programming an
output voltage from 2.6V to 5.1V, odd binary values should be avoided. As a result, the set
resolution for an output voltage higher than 2.5V is 100mV.
5
55H5G
= 5F585G_5I5B5H5G_5G545E5:585G_565;5K ?505Z5I
Output VOUT Higher Than 5.1V
To set the output voltage higher than 5.1V, the user needs to add an external voltage divider. The
resistors used in the voltage divider should be below 10k&. The SET_VOUT_TARGET_CHx register
should be set to 0x32 which is equivalent to an output voltage of 2.5V without the external divider
network. The output voltage regulation in this case might exceed 2% due to extra error from the
resistor divider. R1 and R2 follows the definition below.
Voutx pin
Vout>5.1V
R1
R2
Fig.21: External divider network for high output voltage
5
55H5G
= ?/DIV>
5
1
5
2
+ 1??5F585G_5I5B5H5G_5G545E5:585G_565;5K ?505Z5I
Output Voltage Lower Than 0.9V
The XRP7708 can be programmed to regulate an output voltage lower than 0.9V. However, in this
case the specification of +-2% output voltage accuracy may be exceeded.
OVER-VOLTAGE PROTECTION (OVP)
The Over-Voltage Protection (OVP) SET_OVVP_REGISTER sets the over-voltage condition in
predefined steps per channel. The over-voltage protection is always active even during soft-start
condition. When the over-voltage condition is tripped, the controller will shut down the channel.
When the channel is shut down the controller will then set corresponding OVP Fault bits in the
READ_OVV_UVLO_OVT_FLAG register.
The VOUT OVP Threshold is 150mV to 300mV above nominal VOUT for a Voltage Target of 2.5V or
less. For the Voltage Target of 2.6V to 5.1V, the VOUT OVP Threshold is 300mV to 600mV.
Once the over-voltage Channel is disabled, the controller will check the
SET_FAULT_RESP_CONFIG_LB and SET_FAULT_RESP_CONFIG_HB to determine whether there are
any following channels that need to be shut down. Any following channel will be disabled when
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