STEVAL-ISB001V1 STMicroelectronics, STEVAL-ISB001V1 Datasheet - Page 10

• Manufacturer Part Number: STEVAL-ISB001V1
• Description: BATTERY CHARGER CELL PHONE
• Manufacturer: STMicroelectronics
• Type: Battery Managementr

Specifications of STEVAL-ISB001V1

• Main Purpose: Power Management, Battery Charger
• Embedded: No
• Utilized Ic / Part: STD1LNK60Z
• Primary Attributes: 1 Cell, 4.7V @ 400mA Out, CV/CC, 85 ~ 265VAC Input, 1.9W
• Secondary Attributes: >65% Efficient, 51 ~ 91mW Standby Input Power
• Input Voltage: 85 V to 265 V
• Output Voltage: 5 V
• Product: Power Management Modules
• Silicon Manufacturer: ST Micro
• Silicon Core Number: STD1LNK60Z-1
• Kit Application Type: Power Management - Battery
• Application Sub Type: Battery Charger
• Kit Contents: Board
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: STD1LNK60Z
• Other names: 497-5682

1 Power Transformer Design Calculations
1.7
1.8
1.8.1
10/26
Secondary Winding
Using triple insulation wire with a 0.21mm Copper diameter, the number of turns of secondary
winding is expressed as
where,
N
N
N
N = Number of turns per primary winding layer
Auxiliary Winding
Winding Turns
The MOSFET gate voltage at minimum input voltage should be 10V to conduct the MOSFET
completely. For this application, the optocoupler is powered by the fly-back method, so the
number of auxiliary winding turns of auxiliary winding is calculated as
where,
V
V
N
N
V
V
N
o
g
DC(min)
F
s
p
p
a
p
s
= Optocoupler voltage
= Gate voltage
= Secondary Winding Turns
= Fly-back voltage
= Secondary Winding Turns
= 168 (total turns for all 4 primary winding layers)
= Primary Winding Turns
= Auxiliary Winding Turns
= Primary Winding Turns
= Minimum input bus voltage
V
g
=
V
---------------------------------- -
N
DC min
s
N
=
p
N
------ -
N
p
N
a
=
+
168
--------- -
---------------------------------- -
14
V
o
+
=
N
V
s
12
F
N
a
10
AN2228 - APPLICATION NOTE