STEVAL-ISA113V1 Datasheet, PDF (3/11 Pages) STMicroelectronics – Fully protected against faults

STEVAL-ISA113V1
Adapter features
Table 2. Bill of material (continued)
Ref.
Part
Description
IC1 VIPer06HS Offline high-voltage PWM controller
T1
1921.0040 Transformer
Lin B82144A2105J 1 mH inductor LBC series
Package Manufacturer
SSO-10
ST
Magnetica
Epcos
The transformer core is a standard E13. The output voltage value is set in a simple way
through the RfbH-RfbL voltage divider between the output terminal and the FB pin,
according to the following formula:
Equation 1
VOUT
=
3.3V
⋅ _{⎜⎜⎝⎛}1+
RfbH
RfbL
⎟⎟⎠⎞
In the schematic, RfbH has been split into RfbH1 and RfbH2; and RfbL into RfbL1 and
RfbL2 in order to allow a better tuning of the output voltage value.
If the jumper J1 is not selected, the IC is biased through the internal HV-startup current
generator (“self-biasing”).
If low standby consumption and good efficiency performance are required, the HV-startup
current generator must be excluded. This can be done selecting the jumper J1, which
connects the output terminal to the V_DD pin through a small signal diode. The IC biasing
through the output is referred to as “external biasing”.
Doc ID 024140 Rev 1
3/11