Cell phone battery charger demonstration board
Features
■ Vac = 85 to 265 V
■ Output voltage: 4.7 V
■ Output power: 1.9 W
■ RoHS compliant
Description
The STEVAL-ISB001V1 demonstration board is a
ringing choke converter (RCC)-based, step-bystep cell phone battery charger.
The RCC is essential to the self-oscillating flyback
converter, and operates within the discontinuous
conduction mode (DCM) and continuous
conduction mode (CCM) boundaries without
noticeable reverse recovery of the output
rectifying diodes.
STEVAL-ISB001V1
based on the STD1LNK60Z-1
Data brief
STEVAL-ISB001V1
RCC control is achieved by using discrete
components to control the peak current mode, so
the overall RCC cost is relatively low compared to
the conventional pulse width modulation (PWM)
IC flyback converter. As a result, RCC is widely
used for low-power applications in industry and
home appliances as a simple and cost-effective
solution.
December 2010 Doc ID 18140 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
www.st.com
4
Circuit schematic STEVAL-ISB001V1
1 Circuit schematic
Figure 1. RCC control circuit components schematic
VDC
R2 R3
C13
D5
STD1LNK60Z
R11a
U1B
C5
R11
R12
R7
Q1
R9
C6
R10
Q2
3904
C7
Figure 2. STD1LNK60Z-based RCC schematic
C3
222/1KV
D5
STTH108
R6
5.1
R9
C6
Vbs
R3
R4
R5
Q2
3904
R10
C5
R11
Z1
C7
D1
1N4007
R1
10/1W
D3
1N4007
L1
D2
1mH
150K/1W
1N4007
C1
4.7µF/400V
4.7µF.400V
D4
1N4007
STD1LNK60-1
C2
R7
R2
Q1
R8
+
R13
R12
1K
U1B
D6
1N4148
C4
T
T1
1
6
2
5
3
4
+
C4
100µ/16V
1N5819
D7
1N5819
330µ/16V
R14
C8
+
3904
Q3
+
Q3
3904
CY
102/Y2
R15
R15
75
U1A
C10
U1A
P817
C10
102/60V
R18
910
R16
3.0
R17
2.2
R18
R16
R19
150
R19
TL431
C11
0.1u/60V
U2
TL431
R21
910
R20
2.7
R21
C11
R22
AI11827
C9
47µ/16V
R22
1K
+5V
+5V
+
2/4 Doc ID 18140 Rev 1
Vbs
AI11828
STEVAL-ISB001V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
15-Dec-2010 1 Initial release.
Doc ID 18140 Rev 1 3/4
STEVAL-ISB001V1
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4/4 Doc ID 18140 Rev 1
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