LM(2)5143-Q1 quickstart design tool - revB2.xlsm

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1	LM(2)5143/-Q1 Synchronous Buck Controller Design Tool
2														http://www.ti.com/product/lm5175
3	About		xx			= Input Box								TERMS OF USE
4
5	Step 1: Operating Specifications
6
7				Input Voltage – Min, VIN(min)	30	V
8				Input Voltage – Nom, VIN(nom)	49	V
9				Input Voltage – Max, VIN(max)	50	V
10				Output Voltage, VOUT	15	V			Output Voltage, VOUT2	15	V
11				Full Load Output Current, IOUT	70	A			Full Load Output Current, IOUT2	20	A
12				Switching Frequency, FSW	2200	kHz
13				Frequency Set Resistor, RT	10	kΩ
14				Ambient Temperature, TA	25	°C
15
16	Step 2: Current Sense Resistors
17				Required IOCP Setpoint at VIN(nom)	30	A			Required IOCP Setpoint at VIN(nom)	16	A
18				Recommended Sense Resistance	7.4	mΩ			Recommended Sense Resistance	4.3	mΩ
19				Sense Resistance, RS	2	mΩ			Sense Resistance, RS2	3	mΩ
20				Min Inductor Sat Current, ILO(SAT)	36.5	A			Min Inductor Sat Current, ILO2(SAT)	24.3	A
21				Max power loss in shunt	2.42	W			Max power loss in shunt RS2	1.66	W
22				VIN(min)	139.2	A			VIN(min)	23.6	A
23			IOUT(typ) at OCP Inception:	VIN(nom)	136.5	A		IOUT2(typ) at OCP Inception:	VIN(nom)	23.2	A
24				VIN(max)	136.4	A			VIN(max)	23.2	A
25
26	Step 3: Buck Inductances
27				Ch1 Recommended Inductance	0.57	µH			Ch2 Recommended Inductance	0.85	µH
28				Ch1 Inductance, LO1	1	µH			Ch2 Inductance, LO2	2.2	µH
29				Ch1 Inductor DCR	2	mΩ			Ch2 Inductor DCR	4	mΩ
30				DIL as a % at VIN(nom)	27	%			DIL2 as a % at VIN(nom)	11	%
31
32	Step 4: Output Capacitors
33				Output Voltage Ripple Spec	400	mVpk-pk			Ch2 Output Voltage Ripple Spec	50	mVpk-pk
34				Minimum Output Capacitance	2.2	µF			Ch2 Minimum Output Capacitance	2.5	µF
35				Output Capacitance (derated), COUT	580	µF			Ch2 Output Cap (derated), COUT2	100	µF	For Single-Output Operation in 4-Phase Mode, tie both MODE pins to VDDA. Use FB1 of master IC to set VOUT. Connect FB2 of master IC to AGND. Connect FB2 of slave IC to VDDA to configure it as a slave
36				Maximum Permitted ESR	84	mΩ			Ch2 Maximum Permitted ESR	23	mΩ
37				Output Capacitor ESR	3	mΩ			Ch2 Output Capacitor ESR	2	mΩ	Slave controller (CNTRL2) not shown
38				Resulting Output Voltage Ripple (max)	14	mVpk-pk			Resulting Output Voltage Ripple (max)	5	mVpk-pk	Tie VCCX to GND if not used
39				Output Capacitor RMS Current (max)	1.38	A (rms)			Output Capacitor RMS Current (max)	0.63	A (rms)
40
41	Step 5: Input Capacitors
42				Input Voltage Ripple Spec	2500	mVpk-pk
43				Minimum Input Capacitance	10	µF
44				Input Capacitance, CIN	20.047	µF
45				Maximum Permitted ESR	120.7	mΩ
46				Input Capacitor ESR	1	mΩ
47				Resulting Input Voltage Ripple (max)	119	mVpk-pk
48				Input Capacitor RMS Current (max)	8.75	A (rms)
49
50	Step 6: Soft-start, Hiccup, Dither, DEMB, MODE
51				Soft-Start Time, tSS	3	ms
52				Soft-Start Capacitance, CSS	100	nF
53				Hiccup Fault Time, tRES	12	ms
54				RES Capacitance, CRES	220	nF
55				Modulating Frequency	9
56				*Tie DITH to VDDA
57				* Tie DEMB to VDDA
58				* Tie MODE to VDDA
59
60	Step 7: Compensation Design
61				Load Pole Frequency	1648	Hz			Ch2 Load Pole Frequency	2447	Hz
62				ESR Zero Frequency	91	kHz			Ch2 ESR Zero Frequency	796	kHz
63				Desired Crossover Frequency	60	kHz			Ch2 Desired Crossover Frequency	60	kHz
64				Error Amp Pole Frequency	2.5	Hz			Ch2 Error Amp Pole Frequency	2.5	Hz
65				Upper Feedback Resistor	240	kΩ			Ch2 Upper Feedback Resistor	115	kΩ
66				Lower Feedback Resistor	10	kΩ			Ch2 Lower Feedback Resistor	4.75	kΩ
67
68	Compensation Components
69		Calculated /	Std Values	Std Values		Actual P/Z Frequencies
70	RC1	27.3	27.4	20	kΩ	2	Hz (FPEA)
71	CC1	1.0	1	1	nF	8.0	kHz (FZCOMP)
72	CC2	57	56	33	pF	202	kHz (FPCOMP)
73	RC2	28.3	28	28	kΩ	2	Hz (FPEA2)
74	CC3	0.9	1	1	nF	5.7	kHz (FZCOMP2)
75	CC4	1	0.68	22	pF	200	kHz (FPCOMP2)						Specify Inductor Core Loss	0.3	W
76
77	Efficiency / Power Loss Analyzer
78
79	Step 8: Efficiency
80						Power MOSFETs	(Q1, Q2)		Power MOSFETs	(Q3, Q4)
81					ISC0805NLS, ISC0805NLS			NVMFS5H663, NVMFS5C628NL
82					High-side	Low-side		High-side	Low-side
83				On-State Resistance, RDS(on)	9.0	9.0	mΩ	6	2.5	mΩ
84				Total Gate Charge, QG	13	13	nC	8	25	nC
85				Gate-Drain Charge, QGD	4.7	4.7	nC	1.4	4.5	nC
86				Gate-Source Charge, QGS	6	6	nC	3.8	12	nC
87				Output Charge, QOSS		34	nC		30	nC
88				Output Capacitance, COSS	280	280	pF	213	1700	pF
89				Gate Resistance, RG	1	1	Ω	0.5	0.5	Ω
90				Transconductance, gFS	73	73	S	64	280	S
91				Gate-Source Threshold Voltage, VTH	1.6	1.6	V	2.9	3	V
92				Body Diode Forward Voltage, VBD	0.92	0.92	V	0.7	0.7	V
93				Body Diode Rev Recovery Charge, QRR		28	nC		60	nC
94				Thermal Resistance, θJA	50	50	°C/W	50	38	°C/W
95
96	External Schottky Diode (if applicable)
97				Schottky Fwd Voltage, VFWDsch	0.46	0	V
98				Schottky Rev Recovery Charge, QRRsch	1.5	0	nC
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