Integrated Circuit Diagrams - Bose PACKLITE A1 Manual

Integrated Circuit Diagrams

Pin Pin name
1 Vd_check
2 Vs_check
3 Discharge
4 OC_mon
5 Enable
6 Thermal
7 In_A_Ch2
8 Out_A_Ch2
9 In_B_Ch2
10 Out_B_Ch2
11 In_C_Ch2
12 Pwm-_ch2
13 Pwm+_ch2
14 Mod_Ch2
15 ZobelSense2
16 Average2
17 Average1
18 NTC_in
Description
High impedance input for monitoring the positive power stage voltage. This
controls the soft clipping circuit and the over and under voltage shut down.
Same as above for the negative rail.
High impedance output that generates a current in case of an over-voltage
condition on the power stage voltages (Vs/Vd). This current is designed to turn-on
a set of discharge transistors.
Monitors the state of the control loop and the average voltage across the zobel
resistor, and will turn on in case of of-limit conditions.
Bi-directional input/output.
Open collector output for over temperature warning.
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.
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-_ch2 and Pwm+_ch2) the driver will regard
this as a disable. This is the way the disable is communicated to the driver.
Connects the external loop components. Op-amp output pin connected to the
modulation comparator.
Estimates the power dissipation in the zobel resistor this input is sensing the
zobel voltage via a resistive network. Channel 2.
For the averaging function in ch 2 of the OC monitor a capacitor is connected to
this pin.
For the averaging function in ch 1 of the OC monitor a capacitor is connected to
this pin.
Comparator input for connection of an NTC resistor. When detection a hysterese
current of 100uA is sourced via this pin.
LV4930M (IC3) Block Diagram and Pin Function Table
51