Bose PACKLITE A1 Manual page 52

Integrated Circuit Diagrams
Pin Pin name
19 ZobelSense1
20 Mod_ch1
21 Pwm-_ch1
22 Pwm+_ch1
23 In_C_Ch1
24 Out_B_Ch1
25 In_B_Ch1
26 Out_A_Ch1
27 In_A_Ch1
28 NC
29 Vdd
30 UVP_en
31 Main_Gnd
32 Vss
33 Ref_ch1
34 CS1_ch1
35 CS2_ch1
36 RECout_ch1
37 Vin__ch1
38 DC_FB_ch1
39 Vin_ch2
40 DC_FB_ch2
41 RECout_ch2
42 CS1_ch2
43 CS2_ch2
44 Ref_ch2
Description
Same as pin 15, but for ch 1.
Pin for connecting the external loop components. This pin is an op-amp output
pin and is connected to the modulation comparator.
The first of two balanced high impedance current comparator output. This output
is connected via level shift transistors to the driver.
The second of the balanced high impedance current comparator output. When
both of these outputs are low (Pwm-_ch1 and Pwm+_ch1) the driver will regard
this as a disable. This is the way the disable is communicated to the driver.
Connects the external loop components. Virtual ground summing pin.
Connects the external loop components. Op-amp output pin.
Connects the external loop components. Virtual ground summing pin.
Connects the external loop components. Op-amp output pin.
Connects the external loop components. Virtual ground summing pin.
No connection
Positive supply pin
Enables the Under Voltage Protection by connecting to Vdd and disabling by
connecting to Vss.
General ground for protection and all miscellaneous circuits.
Negative supply
Input reference for channel 2. This pin is a local ground reference for the audio
circuit of this channel. It is not connected internally to main ground.
Pin for connection of capacitor for the dc servo. This pin is the output of the
internal dc servo amplifier.
Pin for connection of capacitor for the dc servo. This pin is virtual ground.
This pin is the ch1 receiver output after an internal series resistor of 1k. By
connecting a capacitor to ground a low pass function is obtained. From this pin
the signal is internally passed on to the output stage.
High impedance audio input. This input is non-inverting.
DC servo feedback point. This is a low impedance point with a correction voltage
of +/- 100mV range. Connect to input via a resistor of 47kohm.
High impedance audio input. This input is non-inverting.
DC servo feedback point. This is a low impedance point with a correction voltage
of +/- 100mV range. Connect to input via a resistor of 47kohm.
This pin is the ch2 receiver output after an internal series resistor of 1k. By
connecting a capacitor to ground a low pass function is obtained. From this pin
the signal is internally passed on to the output stage.
Pin for connection of capacitor for the dc servo. This pin is the output of the
internal dc servo amplifier.
Pin for connection of capacitor for the dc servo. This pin is virtual ground.
Input reference for channel 2. This pin is a local ground reference for the audio
circuit of this channel. It is not connected internally to main ground.
LV4930M (IC3) Pin Function Table (continued)
52