1.4 PMBus communication pull-up resistor value
It is necessary to connect pull-up resistor on Data bus and Clock bus terminal of PMBus .
Recommended value of resistor(maximum value) is shown at figure 1-4.
Note1: Do not exceed the rated output current of converter's terminal (clause 8-1).
Note2: Total of parasitic capacitance and input capacitance should be less 400pF.
1.5 address setting
The figure and table below show recommended resistors value for hard wiring PMBus addresses.
Resistors with 1% tolerance are recommended.
*
1
*
2
Take 0-7 on Addr0, Addr1 per value of resistor and address could be assigned 0-63 per
below formula. when calculation result in 0-12,40,44,45,55 setting, address 127 will be return.
*1: Address setting could not be changed after input voltage is applied .
Be sure to make setting before input voltage is applied.
*2: Addr1 is only CHS400/500-I.
The formula for CHS300-I
The formula for CHS400/500-I
10
0
1
24
Table 1-2 Resistor value
Figure 1-4
Recommended value of pull-up resistor
7
5
6
8
220
36
7
3
5
4
1
2
2
Value
Resistor value [k
Ω
]
#
15
82
130
3
56
6
4
Figure 1-5 Address setting
Address = 16
+ Value(Addr0)
Address = Value(Addr1)
×
8 + Value(Addr0)
Applications manual
For CHS300/400/500-
I
series
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