Denon DRA-CX3 Service Manual page 11

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Terminl Function
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Pin No. Pin Name
1 AGND
2 VSS
3 THM
4 ENA
5 SYN
6 OCM
7 DCG
8 VSCK
9 AGND
10 VDCK
11 VSS
12 AGND
13 NC
14 AGND2
TE
15 IN2+
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16 AGND1
17 IN1-
18 NC
19 TEST
20 VSS
21 AGND
22 VDD
23 FB1
24 NC
25 ZB1
26 VDR1
27 VD1
28 VD1
29 VS1
30 VS1
31 PWM1
32 PWMFB1
33 SUB
34 VS
35 VDR2
36 VD2
37 VD2
38 VS2
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39 VS2
40 PWM2
41 PWMFB2
42 ZB2 .
43 NC
44 FB2
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Analog ground for control chip power supply.
Negative power supply for control chip (-5V).
Thermal Monitor
Error signal of open collector output "L" for two conditions.
1. Over temperature limitation.
2. Over temperature warning. By connecting to the ENA pin, thermal shutdown is set.
Bi-direction input/output.
The input "H" enables to start switching and the input "L" disables.
Input is including hysteresis for glitch free enable of the system.
When the protection circuit detects the over voltage condition, the open collector output turns on.
The switching frequency can be synchronized with frequency of this pin signal to avoid the influence
for AM radio tuner.
Normal condition is "L".
Over Current Monitor
Error signal of open collector output "L" for two conditions.
1. Over current limitation.
2. For monitoring the state of control and average voltage across the zobel resistor in case of of-limit
conditions.
This high impedance output generates a current in case of over voltage condition on the power stage
voltage (VD/VS).
This current is designed to turn-on a set of discharge transistors.
This high impedance input for monitoring negative power stage.
This monitoring controls the soft clipping circuit and the over voltage shutdown.
Analog ground for control chip power supply.
This high impedance input for monitoring positive power stage.
This monitoring controls the soft clipping circuit and the over voltage shutdown.
Negative power supply for control chip (-5V).
Analog ground for control chip power supply.
Input reference for channel 2.
This is true inverting low impedance (1kohm) input for avoiding ground loop noise.
High impedance audio input for channel 2.
This input is non-inverting.
Input reference for channel 1.
This is true non-inverting low impedance (2kohm) input for avoiding ground loop noise.
High impedance audio input for channel 1.
This input is inverting.
Test terminal connect to VSS.
Negative power supply for control chip (-5V).
Analog ground for control chip power supply.
Positive power supply for control chip (+5V).
Feedback for global loop of channel 1.
For estimating the power dissipation in the zobel resister,
this input is sensing the zobel voltage via a resistive network of channel 1.
Positive supply for driver chip of channel 1 with respect to VS1; (VS1+10V).
Positive supply for power stage of channel 1.
Positive supply for power stage of channel 1.
Negative supply for power stage of channel 1.
Negative supply for power stage of channel 1.
PWM output of channel 1.
Feedback for inner loop of channel 1.
Substrate of IMST.
Negative supply for power stage.
Positive supply for driver chip of channel 2 with respect to VS2;(VS2+10V).
Positive supply for power stage of channel 2.
Positive supply for power stage of channel 2.
Negative supply for power stage of channel 2.
Negative supply for power stage of channel 2.
PWM output of channel 2.
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Feedback for inner loop of channel 2.
i For estimating the power dissipation in the zobel resister,
this input is sensing the zobel voltage via a resistive network of channel 2.
Feedback for global loop of channel 2.
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Function
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11
DRA-CX3
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