STEVAL-ISV006V1 STMicroelectronics, STEVAL-ISV006V1 Datasheet - Page 16

• Manufacturer Part Number: STEVAL-ISV006V1
• Description: IC LINEAR
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ISV006V1

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11418

External component selection
Note:
Figure 12. STEVAL-ISV006V1 Iout filter
16/24
As an empirical rule, R1 and R2 should be selected to get:
In order to guarantee proper functionality of the V
R1+R2 should be in the range between 20 µA and 200 µA.
Output voltage sensing capacitor
C2 is placed in parallel to R2 and as close as possible to the V
Its role is to reject the noise on the voltage sensed by the V
Capacitance value depends on the time constant resulting from R2 (τ
from the system switching frequency (100 kHz), as follows:
Output current sensing filter
RS1 is placed in the output rail between the I
Its role is to sense the output current (Iout) flowing toward the load. Voltage drop on RS1 is
sensed by the I
The triangular waveform of the current and noise may cause unexpected triggering of the 50
mV threshold. This can be avoided with a filter such as the one shown below:
Suggested values are:
R
C
P
C ≅
τ
F1
F
vout
o
2
R
ut
= 1 µF
=R
S
≅
1
_
10
10
sns
≅
F2
Iout
*
ICTRL_PLUS
ICTRL_MINUS
∗
= 1 kΩ
<<
Fssw
VOUT
VOUT
50
Fssw
1
1
_
mV
1
%(
max
ctrl-
*
V
R
out
1
and I
//
_
1
max
R
2
ctrl+
∗
I
out
pins and compared with the 50 mV internal threshold.
_
C
Doc ID 18265 Rev 1
max
F
)
R
R
F1
F2
ctrl
- and I
ctrl
pin, the current flowing into the series
ctrl
R
+ pins.
S1
ctrl
pin.
ctrl
pin.
Vbat+
Vbat+
out
= C2*R1//R2) and
AN3319
AM06707v1