A scaled version of the output signal is also provided to the Ruby (pins 22 and 24) and is
available to the APM.
The LVAC signal is rectified and provided to pin 23 for the APM and is used to display
line voltage and provide under voltage and overvoltage protection in case the line voltage
is out of bounds.
R13 programs the current applied to the Ch1 and Ch2 temperature sensors.
Pins 15 and 16 provide a signal informing the APM that a clip event has occurred. It will
be triggered by either a voltage limit or current limit event.
R22/23/24 provides a way for the APM to know what model of amplifier it is connected
to. See the chart below.
XLS 2000/2500 Amplifier Theory of operation.
The XLS2000 and XLS2500 are very similar to the XLS1000/1500 and so only the
differences will be discussed here.
XLS 2000/2500 Output Stage.
There are value differences of some of the resistors and capacitors but the main
difference in the amplifier section, between the 1000/1500 and the larger 2000/2500, is in
the output stage topology. Were the 1000/1500 uses the MOSFET body diode to carry the
current to the Vcc supplies when the MOSFET is turned off, the 2000/2500 uses diodes
D108, 109 to block the current and force it though the anti-parallel diodes D105, 106.
This improves the efficiency of the amplifier. The rest of the amplifier circuits are the
same as the smaller amplifiers.
The APM determines the model and voltage rating of the amplifier by the values of R22,
23 and R24. Below is a chart showing the values for each model.
Model Voltage
Part
Number R22 R23 R24
XLS1000
100V 141576 Open 10K 1.1K
XLS1000
120V 141577 Open 10K 2.49K
XLS1000
220V 141578 Open 4.99K 2.49K
XLS1000
240V 141579 Open 4.99K 4.99K
XLS1500
100V 141580 Open 2.49K 4.99K
XLS1500
120V 141581 Open 2.49K 10K
XLS1500
220V 141582 Open 1.1K 10K
XLS1500
240V 141583 Open 10Ω Open
XLS2000
100V 141607 20K 15K Open
XLS2000
120V 141608 20K 20K Open
XLS2000
220V 141609 15K 20K Open
XLS2000
240V 141610 1.1K 2K Open
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