STEVAL-ISA019V2 STMicroelectronics, STEVAL-ISA019V2 Datasheet - Page 7

• Manufacturer Part Number: STEVAL-ISA019V2
• Description: BOARD EVAL SMPS L6565 3PHASE APP
• Manufacturer: STMicroelectronics
• Type: Motor / Motion Controllers & Driversr

Specifications of STEVAL-ISA019V2

• Mfg Application Notes: L6565/STC04IE170HV AppNote
• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 1, Isolated
• Power - Output: 80W
• Voltage - Output: 24V
• Current - Output: 3.33A
• Voltage - Input: 250 ~ 850V
• Regulator Topology: Flyback
• Board Type: Fully Populated
• Utilized Ic / Part: L6565, STC04IE170HV
• Input Voltage: 250 V to 850 V
• Output Voltage: 24 V
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: L6565, STC04IE170HV
• Other names: 497-6339

AN2495
2.1
2.1.1
2.1.2
Hence:
Equation 8
Now we can calculate the peak current on primary.
Equation 9
Transformer design
Core size
The core size must be chosen according to the power that must be managed, to the primary
inductance, and to the saturation current as well. An approximate but efficient formula could
be used as a starting point. Eventually, the designer may choose a bigger core and repeat
the following steps.
Equation 10
where:
●
●
●
From
Transformer losses and air gap
From Faraday's law we can define the minimum primary winding turns to avoid saturation of
the core. Looking at the saturation curve of the core, we can safely work up to 200 mT:
Equation 11
ΔT is the maximum temperature variation with respect to the ambient temperature
K
that generally ranges between 0.4 and 0.7)
B
Equation
U
max
is the utilization factor of the window (say the portion of the window used for winding
is the maximum flux in the core.
10, we can deduct that the final best choice is an ETD34.
N
pmin
A
=
Doc ID 13127 Rev 4
P
L
V
-------------------------------------------------- -
P
=
in min
I
=
,
P
10
V
------------------------------------------ -
=
Δ
3
dcmin
B A
•
2.5T
V
-------------------------------------
------------------------------------------
ΔT
L
T
•
dcmin
P
O N max
1
-- -
2
I
(
2
S
e
rms primary
•
T
L
P
,
K
onmax
T
P
OUT
(
onmax
u
•
)
B
=
2
max
------------------------------ -
0.200 97μ
=
=
250 10μ
)
1.56mH
1.6A
1.316
•
•
=
[cm
117
4
]
Flyback stage design
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