STEVAL-ISB001V1 STMicroelectronics, STEVAL-ISB001V1 Datasheet - Page 15

• 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

AN2228 - APPLICATION NOTE
Figure 4.
2.5
Constant Power Control
The pole of capacitor C7 can filter the leading edge current spike and avoid a Q2 switch
malfunction. However, it will also lead to delays in primary peak transfer as well as the turning
on of Q2. As a result, different power inputs are produced at different input voltages.
Z1, R11, and R11a provide constant current, which is proportional to the input voltage. This
way, power inputs are basically the same at different input voltages.
Note: They must be carefully selected and adjusted to achieve basically constant power input
at different input voltages. The basic selection process is expressed as
where,
V
L
T
In relation to the present RCC application,
where,
N
N
V
V
N
V
p
I = Current change
d
o
DC
F
z1
a
p
s
Current Sense Circuit
= Primary Inductance
= Transfer delay
= Optocoupler voltage
= Fly-back voltage
= Secondary Winding Turns
= Auxiliary Winding Turns
= Primary Winding Turns
= Zener diode 1 voltage
= Input bus voltage
IR
7
R7
=
I ppk
R
7
R9
C6
V
------------- -
L
DC
3904
p
T
d
=
N
---------------------- -
-------------------------------------------------------------------------------------- -
Q2
a
N
I
V
p
=
DC
V
---------- - T
R
L
+
DC
7
2 STD1LNK60Z-based RCC Control Circuit Components
p
N
------------------------------------- -
+
C7
a
R
Z1
d
V
9
N
o
+
s
+
R
V
11
F
U1B
R11a
–
V
R11
z1
R12
R
9
+
AI11831
R
I 1
I e
7
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