51
LV4930M (IC3) Block Diagram and Pin Function Table
Integrated Circuit Diagrams
Pin Pin
name
Description
1
Vd_check
High impedance input for monitoring the positive power stage voltage. This
controls the soft clipping circuit and the over and under voltage shut down.
2
Vs_check
Same as above for the negative rail.
3
Discharge
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.
4
OC_mon
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.
5 Enable
Bi-directional
input/output.
6
Thermal
Open collector output for over temperature warning.
7
In_A_Ch2
Connects the external loop components. Virtual ground summing pin.
8
Out_A_Ch2
Connects the external loop components. Op-amp output pin.
9
In_B_Ch2
Connects the external loop components. Virtual ground summing pin.
10
Out_B_Ch2
Connects the external loop components. Op-amp output pin.
11
In_C_Ch2
Connects the external loop components. Virtual ground summing pin.
12
Pwm-_ch2
The first of two balanced high impedance current comparator output. This output
is connected via level shift transistors to the driver.
13
Pwm+_ch2
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.
14
Mod_Ch2
Connects the external loop components. Op-amp output pin connected to the
modulation comparator.
15
ZobelSense2
Estimates the power dissipation in the zobel resistor this input is sensing the
zobel voltage via a resistive network. Channel 2.
16
Average2
For the averaging function in ch 2 of the OC monitor a capacitor is connected to
this pin.
17
Average1
For the averaging function in ch 1 of the OC monitor a capacitor is connected to
this pin.
18
NTC_in
Comparator input for connection of an NTC resistor. When detection a hysterese
current of 100uA is sourced via this pin.
