STEVAL-ISA011V1 STMicroelectronics, STEVAL-ISA011V1 Datasheet - Page 12

• Manufacturer Part Number: STEVAL-ISA011V1
• Description: BOARD EVAL VIPER12A LP AC/DC
• Manufacturer: STMicroelectronics
• Series: VIPER™r
• Type: AC/DC Switching Convertersr

Specifications of STEVAL-ISA011V1

• Design Resources: STEVAL-ISA011V1 Gerber Files STEVAL-ISA011V1 Schematic STEVAL-ISA011V1 Bill of Materials
• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 1, Isolated
• Power - Output: 4.1W
• Voltage - Output: 4.5V
• Current - Output: 900mA
• Voltage - Input: 88 ~ 265VAC
• Regulator Topology: Flyback
• Frequency - Switching: 60kHz
• Board Type: Fully Populated
• Utilized Ic / Part: VIPer12A
• Input Voltage: 88 V to 265 V
• Output Voltage: 4.5 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: VIPER12ADIP-E
• Kit Application Type: Power Management - Voltage Regulator
• Application Sub Type: AC / DC Adapter
• Kit Contents: Board
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: VIPer12A
• Other names: 497-6413; STEVAL-ISA011V1

STEVAL-ISA011V1 Board Design
1.3
1.4
12/33
Completed Transformer Design
All of the calculations for the transformer design are complete. They include:
Notes:
1.
2.
3.
The transformer (reference number SRW16ES_E44H013) was designed and manufactured
by TDK using aforementioned the data.
Feedback Loop
The transfer function 'control-to-output' for a flyback converter operating in DCM is given by
the following formula:
Equation 19
Where,
G
z
p
fly
V
fly
I
fly
FB
O
= flyback zero compensation reference,
= flyback pole reference, and
= flyback gain,
= output voltage ripple,
Primary Inductance,
Turns Ratio, and
Winding Current Values (RMS, Average, and Peak).
In order to prevent transformer saturation during the start-up phase, the current limit of
the VIPer12A (I
current.
For thermal limits (power dissipated in the magnetic core), the peak current (calculated
in
The RMS value of the current flowing through the windings is used first for calculating
the power dissipated in the windings, then for winding size selection.
= VIPer12A feedback pin current,
Equation 6: on page 7
LIM
= 480mA, see datasheet for details) must be considered as the peak
V
) must be used.
O
s
Rev. 1
I
FB
s
=
G
fly
⎛
⎝
----------------------- -
⎛
⎝
1
1
+
+
-------- -
p
--------
z
s
s
fly
fly
⎞
⎠
⎞
⎠
AN2272 - Application Note