AK7846 Datasheet, PDF (13/16 Pages) Asahi Kasei Microsystems – Stereo Audio Class-D Amp with Power Booster for Piezo Speakers

AKEMDAKEMD CONFIDENTIAL
[AK7846]
TYPICAL APPLICATION CIRCUIT
Li-ion Battery
C4
ERRO _PDN
DVDDI
FC1
FC0
PG2
PG1
PG0
INL
C5
Pre
Gain
C6 ^INR
VC
C3
Pre
Gain
VREF
L1
VFB ^C9
VBAT
VCOIL ^D1
Boost DCDC
VSS3
C1
VDD1
LPF
ClassD
L
LPF
Class-D
R
VCLN
VCLP
VSS1
VSS4
VDD2
VCLN
VCLP
VSS2
Piezo Speaker
C7
Piezo Speaker
C8
Figure 4 AK7846 Application Schematic
Recommended external components are shown in Table. 3 as follows.
Reference
L1
D1
C1
C3
C4, C5, C6
C7,C8
C9
Type
Inductor ※
Diode
/ Schottky
Capacitor
/ Ceramic
Capacitor
/ Ceramic
Capacitor
/ Ceramic
Capacitor
/ Ceramic
Value
1.0uF
(30V, 1A)
Manufacturer
CoilCraft
TDK
SANYO
Part No.
LPS3010-102ML
TFC252008MC-1R0
SS1003EJ
10µF / 25V Taiyo Yuden TMK325BJ106MD-B
0.01µF / 16V Taiyo Yuden EMK105BJ103KV
0.1µF / 16V Taiyo Yuden EMK105BJ104KV-B
2.2µF / 16V Taiyo Yuden EDK107BJ225KA
Table. 3 External Recommendation Parts
Size (mm)
2.95 ×2.95 ×0.9
2.5 ×2.0 ×0.8
1.6 × 0.8 × 0.6
3.2 × 2.5 × 0.85
1.0 × 0.5 × 0.5
1.0 × 0.5 × 0.5
1.6 × 0.8 × 0.8
※Chose one of inductors in Table. 3
Selection of L1, C1 and D1 are very important because they affect DCDC converter paformance directly. For stability
operation, AKM recommends them described in Table. 3
Rev.04.9
– 13 –
2008/03