PA4401 PROTEC [Protek Devices], PA4401 Datasheet - Page 4

• Manufacturer Part Number: PA4401
• Description: Click-Pop Suppression Device
• Manufacturer: PROTEC [Protek Devices]

CONNECTION DIAGRAM
The PA4401 will be placed after the pre-amplifier and before the output bypass capacitors.
STARTUP
At Startup, the Power supply ramps from 0V to V
and controls the ramp rate of the DC bias voltage going to the +ve terminal of the bypass capacitor. The ramping behavior of the
device can be controlled by an external capacitor. This startup operation is shown in figure 5.
SHUTDOWN
At Shutdown, The PA4401 detects a “power fail” condition and the control switches are turned off, opening the connection
between INx and OUTx providing a discharge path through an internal 100KΩ resistor for the bypass capacitor. The time
constant of the internal resistor and by-pass capacitor, allows for a slow discharge, which will prevent any audible “pop”
appearing at the system output. This shutdown operation is shown in figure 5.
Start-up “pop”
ANALOG PRODUCTS DIVISION
95025. Rev.0. 05/2008
NOT FOR USE IN LIFE SUPPORT SYSTEMS
<50mV
V
V
0
CC
CC
0
V
561 E. Elliot Road #175, Chandler, AZ 85225 Tel: [phone]. Fax: [phone]
CC
50mS
t
Figure 5: Power-Up and Power-Down sequences and waveforms with PA4401
coupling capacitor
down transition at
PA4401 slows
shutdown “pop”
<50mV
Pre
Amp
Pre
Amp
Figure 4: Typical Connection Configuration for PA4401
CC
www.protekanalog.com
between 20 -200ms. The PA4401 detects the ramp in the voltage at its inputs
50mS
t
IN
IN
OUT
OUT
Click-Pop Suppression Device
+
+
time
mSec
Power Supply Waveform
Bypass capacitor input plate
System output
PA4401