Datasheet

V
O
[V] R
SET
[kΩ] V
O
[V] R
SET
[kΩ]
0.60 10 1.50 46.4
0.65
11 1.60 51.1
0.70
12.1 1.70 56.2
0.75
13.3 1.80 61.9
0.80
14.7 1.90 68.1
0.85
16.2 2.00 75
0.90
17.8 2.10 82.5
0.95
19.6 2.20 90.9
1.00
21.5 2.30 100
1.05
23.7 2.50 110
1.10
26.1 3.00 121
1.15
28.7 3.30 133
1.20
31.6
1.25
34.8
1.30
38.3
1.40
42.2
The output voltage and the maximum output voltage can be pin
strapped to three fi xed values by connecting the VSET pin according
to the table below.
V
O
[V]
VSET
0.60 Shorted to PREF
1.2 Open “high impedance”
2.5 Logic High, GND as reference
Output Voltage Adjust using PMBus
The output voltage set by pin-strap can be overridden by confi guration
fi le or by using a PMBus command. See Electrical Specifi cation for
adjustment range.
When setting the output voltage by confi guration fi le or by a PMBus
command, the specifi ed output voltage accuracy is valid only when
the set output voltage level falls within the same bin range as the
voltage level defi ned by the pin-strap resistor RSET. The applicable bin
ranges are defi ned in the table below. Valid accuracy for voltage levels
outside the applicable bin range is two times the specifi ed.
Example:
Nominal VO is set to 1.10 V by RSET = 26.1 kΩ. 1.10 V falls within the
bin range 0.988-1.383 V, thus specifi ed accuracy is valid when adjust-
ing VO within 0.988-1.383V.
V
O
bin ranges [V]
0.600 – 0.988
0.988 – 1.383
1.383 – 1.975
1.975 – 2.398
2.398 – 2.963
2.963 – 3.753
Output Voltage Range Limitation
The output voltage range that is possible to set by confi guration or
by the PMBus interface is limited by the pin-strap resistor RSET. The
maximum output voltage is set to 110% of the nominal output value
defi ned by R
SET, V
O,MAX
= 1.1 x V
O,RSET
. This protects the load from an
over voltage due to an accidental wrong PMBus command.
A = 3289.56,
B = -6248.12,
C = 2964.06
Write 0x7CB941FDC3417CCD99 to PID_TAPS register and write
command STORE_USER_ALL
Note that if DLC is enabled, for best results VI must be stable before
DLC algorithm begins.
Load Transient Response Optimization
The product incorporates a Non-Linear transient Response, NLR, loop
that decreases the response time and the output voltage deviation
during a load transient. The NLR results in a higher equivalent loop
bandwidth than is possible using a traditional linear control loop. The
product is pre-confi gured with appropriate NLR settings for robust and
stable operation for a wide range of input voltage and a capacitive
load range as defi ned in the section External Decoupling Capacitors.
For an application with a specifi c input voltage, output voltage, and
capacitive load, the NLR confi guration can be optimized for a robust
and stable operation and with an improved load transient response.
This will also reduce the amount of output decoupling capacitors and
yield a reduced cost. However, the NLR slightly reduces the effi -
ciency. In order to obtain maximal energy effi ciency the load transient
requirement has to be met by the standard control loop compensation
and the decoupling capacitors. The NLR settings can be reconfi gured
using the PMBus interface.
Remote Sense
The product has remote sense that can be used to compensate for
voltage drops between the output and the point of load. The sense
traces should be located close to the PWB ground layer to reduce
noise susceptibility. Due to derating of internal output capacitance
the voltage drop should be kept below V
DROPMAX
= (5.5–V
O
)/2. A large
voltage drop will impact the electrical performance of the regulator. If
the remote sense is not needed, +S should be connected to VOUT and
−S should be connected to GND.
Output Voltage Adjust using Pin-strap Resistor
Using an external Pin-strap resis-
tor, RSET, the output voltage can
be set in the range 0.6 V to 3.3
V at 28 different levels shown
in the table below. The resistor
should be applied between the
VSET pin and the PREF pin.
RSET also sets the maximum output voltage, see section “Output
Voltage Range Limitation.” The resistor is sensed only during product
start-up. Changing the resistor value during normal operation will
not change the output voltage. The input voltage must be at least 1
V larger than the output voltage in order to deliver the correct output
voltage. See Ordering Information for output voltage range.
The following table shows recommended resistor values for RSET.
Maximum 1% tolerance resistors are required.
VSET
R
SET
PREF
OKDx-T/50-W12-C
50A Digital PoL DC-DC Converter Series
MDC_OKDx-T/50-W12-C.A04 Page 22 of 41
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