Datasheet

Device description PM6641
32/47 Doc ID 13510 Rev 3
where VREF = 0.9V is the constant voltage forced by CSNS pin, R
CSNS
[Ω] is the resistor
connected between CSNS and AGND, α is the coefficient that collects the MOS current
sensing scaling factor and other design parameters and I
CL
is the peak current limit [A].
The following table resumes values for all the switching regulators.
The following graph is a plot of the switching regulators peak current limit, increasing the
R
CSNS
resistor:
Figure 33. SW regulators peak current limit
From the previous plot and table it’s clear that the three regulators peak current limits are
scaled; by changing the R
CSNS
external resistor the three peak current limits all change.
Table 11. Typical SW regulators values
SW regulator
α
1.8V 333x10e3
1.5V 222x10e3
1.05V 278x10e3
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
40 60 80 100 120 140 160 180
Rcsns [kOhm]
Current Limit [A]
CL_1V8
CL_1V5
CL_1V05
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7.00
40 60 80 100 120 140 160 180
Rcsns [kOhm]
Current Limit [A]
CL_1V8
CL_1V5
CL_1V05