P9415-R Datasheet

© 2021 Renesas Electronics Corporation

30

May 4, 2021

9. Applications Information

9.1 External Components

The P9415-R requires a minimum number of external components for proper operation. For more information, see Figure 26 and Table 6 and

AN-998 Determining critical component values for Wireless Power Receivers.

9.2 Rx Wireless Power Coil

The Rx coil is dependent on customer requirements and most are custom designs. Renesas recommends the following measured values for

Rx-only coils:



Ls = 8 to 10µH



DCR = < 0.3Ω



ACR = < 0.4Ω

Table 5.

Recommended Coil Manufacturer

Output Power

Vendor

Part Number

Inductance at

100kHz

Resonant Caps (Cs)

DC Resistance at 20℃

15W

Luxshare

ICTR-QS5858031L-MW034

9.0±0.2μH

400nF

195mΩ+/-10%

9.3 Resonance Capacitors

The series resonance capacitors (C32, C33, C34, C36, and C37) are critical components and must be chosen carefully. All current that flows

to the load flows through these components plus any current loss in the rectifier AC to DC conversion. The recommended capacitor is the 100nF

Murata (GRM155C71H104KE19, X7S, 50V, or GRM155R61H104KE19, X5R, 50V), which have an ESR < 0.1ohms at 100kHz. The

GRM155C71H104KE19 capacitor is the best choice based on ESR value and DC bias effects. If another capacitor is chosen, inspecting the

ESR vs. Frequency curve of the manufacturer’s capacitor datasheet is necessary to compare ESR characteristics as well as the DC bias effects

on the capacitor value. Adding non-populated (NP) component placement (C37) is advised if the additional capacitance is needed for a particular

Rx coil.

9.4 Input Capacitor (VRECT Capacitors)

The LDO input capacitors (VRECT capacitors) should be located as close as possible to the VRECT pins and ground (PGND). Ceramic

capacitors are recommended for their low ESR and small profile.

9.5 Output Capacitor (VOUT Capacitors)

The output capacitor connection to the ground pins (PGND) should be made as short as practical for maximum device performance. Because

the LDO is designed to function with very low ESR capacitors, a ceramic capacitor is recommended for the best performance. For better

transient response, the total amount of output capacitance should be increased to meet the output voltage variation target of the application

(VRECT capacitance might need to be increased as well).