Specifications; Pop-Less/Click-Less Start-Up And Shutdown; Overcurrent Protection - Philips UM10155 User Manual

Philips Semiconductors
Fig 5. Component layout
4. Specifications

4.1 Pop-less/click-less start-up and shutdown

4.2 Overcurrent protection

UM10155_2
User manual
001aaf152
Table 2. Specifications
Symbol Parameter
V supply voltage
P
P output power
L
efficiency
THD+N total harmonic
distortion-plus-noise
S/N signal-to-noise ratio
f PWM frequency
PWM
V offset voltage
offset
A provision has been added to the circuit to provide pop-less/click-less start-up and
shutdown. To make use of the start-up facility, make sure that the supply power (pins J5
and J9) is applied prior to enabling the amplifier (connecting J3 to J4). To benefit from the
pop-less shutdown feature, disable the amplifier (disconnect J3 and J4) prior to removing
the supply power.
A provision has been added to the circuit to monitor the current flowing through the Power
MOSFETs (Q13 and Q14). The voltage appearing between pins J5 and J6 is proportional
to the current in MOSFET Q14 (ratio: 50 mV/A) and the voltage between J8 and J9 is
proportional to the current in MOSFET Q13 (ratio: 50 mV/A). With the use of an external
Rev. 02 — 5 September 2006
Discrete Class D High Power Audio Amplifier
PHILIPS
class D amp.
version 1.00
J3
J4
+
+
J1
C5
J2
Q13
+
C7
+
international
patent
WO 03/090343
Fig 6. Top silk-screen
Conditions
equal positive and negative
supply voltages
V = 45 V; R = 4 ;
P L
appropriate heatsink needed
P = 100 W; R = 4
L L
P = 10 W; frequency range
L
from 20 Hz to 20 kHz
idle
DC value
UM10155
+
J5
J6
C17
C11
C15
L1
Q14
J10
J11
+
J7
J8
C14
J9
C19
001aaf153
Value
30 V to 45 V
200 W (RMS)
> 92 %
< 0.03 %
> 120 dB
~ 400 kHz
< 50 mV
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
6 of 12