UM10155_2
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual
Rev. 02 — 5 September 2006
7 of 12
Philips Semiconductors
UM10155
Discrete Class D High Power Audio Amplifier
circuit these two signals may be used to disable the amplifier (disconnect J3 and J4) in
case of an overcurrent situation. Similarly the J3-J4 pin combination can be used to
disable the amplifier in case of other fault conditions.
4.3 Important notice
The ‘High Power Class D Audio Amplifier Demonstrator Board’ is meant to demonstrate
the capabilities of the specific Class D Amplifier design and its semiconductor
components. No provisions for short-circuit and overcurrent protection were made on the
demonstrator board itself. Neither was an operating temperature compensation feature
implemented on the board. The circuit on the board is reduced to its essentials.
In this implementation the ‘High Power Class D Audio Amplifier Demonstrator Board’ is
not intended to be used for long term operation or under extreme temperature conditions
when delivering substantial output power.
5.
Wiring diagram and powering-up
Audio input: J1 is signal; J2 is ground
Initially, leave J6 and J8 unconnected; J7 and J11 are at the same (ground) potential
Fig 7.
Wiring diagram
4
Ω
to 8
Ω
10 mF
30 V to 45 V
10 mF
30 V to 45 V
001aaf154
J3
J4
J5
J6
J10
J11
J8
J9
J7
J1
J2
signal
ground
C5
class D amp.
version 1.00
international
patent
WO 03/090343
PHILIPS
Q14
Q13
C7
+
+
+
+
+
+
C14
C11
C17
C15
L1
C19
