Tyco TX 75149 manual Stability Analysis Tool

SAT draws the Bode plot of the voltage loop gain on the right half of the page as shown in Figure 5. The phase margin, which is a measure of stability, and the gain crossover frequency, which is a measure of fast transient response, are also calculated and presented below the Bode plot.

You can enter your notes under the "Notepad Area for JFW050A Module" section in the left lower corner of the page. You can also edit the circuit parameters and simulate various what-if scenarios and record the results on the same page. Figure 6 below compares two scenarios where the value of Cb2 is changed from 1000 ∝F to 6800 ∝F.

To investigate a different configuration, click on the Configuration Menu tab at the bottom of the Excel worksheet which will take you back to the configuration- selection page. If you click on the circuit diagram for Configuration 2, the page for that configuration will appear in the window and the Configuration 4 page will disappear (Figure 7). You can now repeat the analysis in a manner similar to the previous case. There is no need to re-load the module data file for JFW050A to perform an analysis for another configuration.

Stability Analysis Tool

	SENSE	LS1	RS1			LS2	RS2
			Ra 1	Ra2	Ra3		Rb1	Rb2
	DC /DC		Ca 1	Ca2	Ca3		Cb1	C b2	RL
C ONVERTER
			La1	La2	La3		Lb1	Lb2
		Please enter the circuit parameters below
			Rload = 0.5		ohm
Rs1	= 1				Rs2	= 5			mohm
Ls1	= 4				Ls2	= 100			nH
Ra1	= 100	Ra2 = 100	Ra3 = 10		Rb1	= 10	Rb2 = 10		mohm
La1	= 1	La2 = 1	La3 = 1		Lb1	= 10	Lb2 = 10		nH
Ca1	= 10	Ca2 = 10	Ca3 = 1000		Cb1	= 1000	Cb2 = 1000		∝F
			Click to Calculate Stability
		Notepad Area for JFW050A Module

Magnitude of the Loop Gain

	60
	40
Gain (dB)	20
	0
	-20
	-40

10	100	1000	10000	100000
		Frequency (Hz)

Phase of the Loop Gain

	180
	120
(deg)	60
	0
Phase
	-60
	-120
	-180

10	100	1000	10000	100000
		Frequency (Hz)

Gain crossover frequency:	Hz
Phase Margin:	degrees

Fig. 4. Page for entering and editing circuit parameters, shown for the case of configuration 4.

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