ST STDES-50W2CWBC

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Item Q.ty Ref. Part/value Description Manufacturer Order code

60 2 U201-202 STG719STR, SOT23-6L

Low voltage 4 ohm SPDT

switch

ST STG719STR

61 1 U200

STWBC2-HP, VFQFPN

8X8X1.0 68L PITCH 0.4

ROUT A

Digital controller for

wireless battery charger

transmitters

ST STWBC2-HP

62 2

D203

D209

0603 Green LEDs

Wurth

Elektronik

150060VS75000

63 1 D202 0603 Red LEDs

Wurth

Elektronik

150060RS75000

64 2 R235-236

100 R, 0402, 1/16 W, ±5 %,

SMD

Resistors

Yageo or

generic

RC0402JR-07100RL

65 1 C308 47 µF, D6.3

Aluminum electrolytic

capacitor

Panasonic EEEFTH470XAP

66 1 C104

33 nF, 0603, 50 V, ±10 %,

X7R, SMD

Capacitor

Kemet or

generic

C0603C333K5RACTU

TN1399

Bill of materials

TN1399 - Rev 1

page 19/26

Main Page

Overview2
Figure 1. STDES-50W2CWBC Reference Design2
Figure 2. Block Diagram of a Typical Power Transfer System2
Specifications3
Figure 3. STDES-50W2CWBC Main Blocks3
Test Setup4
Test Conditions and Equipment4
Procedure4
Table 1. Test Equipment4
Table 2. Test Tools4
Table 3. Internal Voltage Range4
Table 4. Power-On LED Status5
Table 5. Presence Detection Specifications5
Table 6. Level of the STSC Power Supplies5
Measurements/Waveforms/Test Data6
STWBC2-HP Startup Waveform6
Presence Detection Waveform6
Figure 4. Typical Startup Waveform: Power-On Sequence6
Power Transfer Switching Waveform7
Figure 5. Presence Detection Waveform7
Figure 6. Coil 1 in Half-Bridge Mode8
Figure 7. Coil 2 in Half-Bridge Mode8
STSC Waveform9
Figure 8. Coil 1 in Full-Bridge Mode9
Figure 9. Coil 2 in Full-Bridge Mode9
ASK Demodulation Waveform10
Figure 10. Power Automatic Boost (5-20 V)10
Figure 11. ASK Demodulation Frame10
Q-Factor Accuracy Test11
Table 7. Q-Factor Accuracy Test with RMB Coins11
Schematic Diagrams12
Figure 12. STDES-50W2CWBC Circuit Schematic (1 of 4)12
Figure 13. STDES-50W2CWBC Circuit Schematic (2 of 4)13
Figure 14. STDES-50W2CWBC Circuit Schematic (3 of 4)14
Figure 15. STDES-50W2CWBC Circuit Schematic (4 of 4)15
Bill of Materials16
Conclusions20
Appendix A Reference Design Warnings, Restrictions and Disclaimer21
Revision History22
Table 8. Document Revision History22
Table of Contents23
List of Tables24
List of Figures25

ST STDES-50W2CWBC - Page 19

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