Electronic Components Part Numbers Available at ChinaICWeb.com
Figure 1 shows a typical dc-to-dc converter configuration. As in many PWM controllers, the non-inverting input of the voltage feedback error amplifier is internally connected to the reference voltage, Vr. The output voltage of the converter is set by a resistor divider network R1 and R2. This configuration enables a fixed output voltage that is equal to or greater than the reference voltage. But in many power conversion designs, it is useful to vary the output to a value lower than the reference voltage and to dynamically adjust the output voltage. The op-amp circuit shown in Figure 3 gives designers a simple way to do this. Scaling the output voltage with respect to a control voltage VC is totally flexible. This application note describes how to use this simple solution and provides a step-by-step design procedure to assist designers in calculating the specific parameters required by their circuits.
U130A
U130A
UM611
UM611
UVX2C470MRAY
UVX2C470MRAY
UPSD3422E
UPSD3422E
US6X7
US6X7
UTR6440
UTR6440
UPD703214YGFA-xxx-JBT
UPD703214YGFA-xxx-JBT
UVX1V4R7MPA
UVX1V4R7MPA
UPSD3214BV-24U1T
UPSD3214BV-24U1T
UC2844BD1
UC2844BD1
UPA1520B
UPA1520B
UC3844BD1R2G
UC3844BD1R2G
UF5406
UF5406
UC3714
UC3714
UVX1H331MEA
UVX1H331MEA
UZ8727
UZ8727
US5A13AS17K
US5A13AS17K
UPG173TA
UPG173TA
UA78M06
UA78M06
UPSD3254A-24U6
UPSD3254A-24U6
UDA1334ATS
UDA1334ATS
UR3HCGNP-001
UR3HCGNP-001
UNR911NJ
UNR911NJ
UDA1338H
UDA1338H
UPSD3253B-40U1T
UPSD3253B-40U1T
UPC4071G2
UPC4071G2
U62256ADC10LL
U62256ADC10LL
UC1711
UC1711
UPC358G2
UPC358G2
UPD4482163GF-A44
UPD4482163GF-A44
UPA2707GR-E1-A
UPA2707GR-E1-A
UVX2A3R3MDA
UVX2A3R3MDA
UPD70F3204F1-EA6
UPD70F3204F1-EA6
UCC27423DGN
UCC27423DGN
UM91531
UM91531
UZ36BS
UZ36BS
UNR31AV
UNR31AV
UG06C
UG06C
U5FL2C48A
U5FL2C48A
UPD703210YGKA-xxx-9EU
UPD703210YGKA-xxx-9EU
UPD4481321GF-A85
UPD4481321GF-A85
UA78L10CLPR
UA78L10CLPR
UM5111
UM5111
UVX1V682MDA
UVX1V682MDA
UCA6475N
UCA6475N
UPD70F3134AGJ-UEN
UPD70F3134AGJ-UEN
UFL-LP-066-A
UFL-LP-066-A
UPSD3354AV-40U6
UPSD3354AV-40U6
UVX2G3R3MRAY
UVX2G3R3MRAY
UNRF2AT
UNRF2AT
UCC5672PWP
UCC5672PWP
U62256ADC07G1
U62256ADC07G1
U16C60
U16C60
UVX2W3R3MDA
UVX2W3R3MDA
UPSD3354AV-24U6T
UPSD3354AV-24U6T
UCC2807-2
UCC2807-2
UCC2580D-1
UCC2580D-1
UM348X
UM348X
UPSD3255BV-40U6
UPSD3255BV-40U6
UG-21D/U
UG-21D/U
UPSD3213B-24T6
UPSD3213B-24T6
UPA1819GR-9JG
UPA1819GR-9JG
US3021M
US3021M
UCC1776
UCC1776
UVX2E222MHA
UVX2E222MHA
UVX1J183MDA
UVX1J183MDA
UT63M105PPC5
UT63M105PPC5
UPD120N25TA-E1
UPD120N25TA-E1
UZ5822
UZ5822
UVX2G4R7MPA
UVX2G4R7MPA
UVX2GR47MRAY
UVX2GR47MRAY
UA726
UA726
UMA5N
UMA5N
UPSD3214AV-24T1
UPSD3214AV-24T1
U4050B-AFL
U4050B-AFL
UPD44164185F5-E50-EQ1
UPD44164185F5-E50-EQ1
UPSD3214AV-40U1
UPSD3214AV-40U1
UZ708HR2
UZ708HR2
UPD23C64340
UPD23C64340
UC385TDKTTT-3
UC385TDKTTT-3
UVX2W123MRAY
UVX2W123MRAY
UPSD3334BV-40T1
UPSD3334BV-40T1
U630H16SK45
U630H16SK45
uPSD3254AV-40T1T
uPSD3254AV-40T1T
UZ8118
UZ8118
UPA2706TP
UPA2706TP
UCC2800PW
UCC2800PW
UPD4482183GF-A44Y
UPD4482183GF-A44Y
UCC2580DTR-3
UCC2580DTR-3
UPC311C
UPC311C
UPG2012TK-E2
UPG2012TK-E2
UVX1V2R2MDA
UVX1V2R2MDA
UZ130HR2
UZ130HR2
UPD120N33T1B
UPD120N33T1B
UVX1CR47MEA
UVX1CR47MEA
UC1705D
UC1705D
UPC1872CU
UPC1872CU
uA9636ACP
uA9636ACP
UA733CN
UA733CN
USR934
USR934
UC2526AN
UC2526AN
UPD753206GT
UPD753206GT
UCC2880-4
UCC2880-4
UVX2V3R3MPA
UVX2V3R3MPA
UPC1099
UPC1099
UGT20.0
UGT20.0
UDA1352HL
UDA1352HL
UM6116K-V
UM6116K-V
UVX2V100MEA
UVX2V100MEA
UPD78001BGCA
UPD78001BGCA
UPD784218AGC
UPD784218AGC
UCC2813D-0
UCC2813D-0
UVX0J2R2MEA
UVX0J2R2MEA
UVX1E220MRAY
UVX1E220MRAY
UPD1705C-012
UPD1705C-012
UM3751
UM3751
UPD75004GB
UPD75004GB
UES1403
UES1403
USB1T20MPX
USB1T20MPX
UPD75P218GF-3BR
UPD75P218GF-3BR
UCC2941-3
UCC2941-3
UVX1V471MEA
UVX1V471MEA
U3550BM-AFL
U3550BM-AFL
UF1010S
UF1010S
ULQ2460C
ULQ2460C
UNR2221
UNR2221
UMA20A
UMA20A
UM621024CM-70L
UM621024CM-70L
UNR621F
UNR621F
UPD3575
UPD3575
UPSD3335AV-40T1
UPSD3335AV-40T1
UPD3788
UPD3788
UPD444016G5-12-7JF
UPD444016G5-12-7JF
UVP-7188
UVP-7188
UTC8118
UTC8118
UCC3809
UCC3809
uRAM3HN3
uRAM3HN3
UNR112Y
UNR112Y
UPA821TC-T1
UPA821TC-T1
UPSD3424E
UPSD3424E
UCC3806J
UCC3806J
UVX2C4R7MEA
UVX2C4R7MEA
UCC3580DTR-2G4
UCC3580DTR-2G4
UC28025
UC28025
UF4016GP
UF4016GP
UP-425
UP-425
UPD16813GS
UPD16813GS
UPD75P3018AGK-9EU
UPD75P3018AGK-9EU
UC3872
UC3872
UG2265
UG2265
UPD16454AP
UPD16454AP
UPD71051C-10
UPD71051C-10
USR20
USR20
UDZS33B
UDZS33B
ULN2803ADW
ULN2803ADW
UDZS11B
UDZS11B
UPD78F0034AGC-AB8
UPD78F0034AGC-AB8
UT8CR512K32-17VCC
UT8CR512K32-17VCC
UA2-3SNU-R
UA2-3SNU-R
UDN2987A-6-T
UDN2987A-6-T
UPC7818AHF
UPC7818AHF
UCC28513
UCC28513
UC3705D
UC3705D
UPG2030TK-E2-A
UPG2030TK-E2-A
U30FWJ2C48M
U30FWJ2C48M
UPA2708GR-E2
UPA2708GR-E2
UA78L05ACLPM
UA78L05ACLPM
UPG2008TK-E2
UPG2008TK-E2
UFS170J
UFS170J
UPG2151T5K
UPG2151T5K
UL1901KII
UL1901KII
UCC3801DTRG4
UCC3801DTRG4
UVX1H223 MHA
UVX1H223 MHA
UCN5841
UCN5841
UT62256BSC-70L
UT62256BSC-70L
UPC1701C
UPC1701C
UBA2050A
UBA2050A
UT63M105PVX
UT63M105PVX
UPD78C14LA
UPD78C14LA
UNR9112J
UNR9112J
UC2874-2
UC2874-2
UVX2E3R3MRAY
UVX2E3R3MRAY
UPA102
UPA102
uA709CP
uA709CP
UPA895TD
UPA895TD
UVX2V102MPA
UVX2V102MPA
UPSD3233AV-24U6
UPSD3233AV-24U6
UPSD3212CV-24T6T
UPSD3212CV-24T6T
UFT30-28
UFT30-28
UAA2067G
UAA2067G
ULBM5
ULBM5
UVX0J3R3MPA
UVX0J3R3MPA
UPD4217800LG5-A70
UPD4217800LG5-A70
UPD4482362GF-A44Y
UPD4482362GF-A44Y
UVP-747
UVP-747
UPD16835AGS-BGG
UPD16835AGS-BGG
UPA67C
UPA67C
UC2840J
UC2840J
UPD16675AP
UPD16675AP
UVX2C3R3MPA
UVX2C3R3MPA
UPSD3253AV-40U6
UPSD3253AV-40U6
UT62L12916
UT62L12916
UC3844N
UC3844N
UGE0421AY4
UGE0421AY4
UT6264BPC-70L
UT6264BPC-70L
UC1625
UC1625
U634H256SA35G1
U634H256SA35G1
UPD44165184F5-E60-EQ1
UPD44165184F5-E60-EQ1
UF604
UF604
UPD17P204-001
UPD17P204-001
UPC2746T
UPC2746T
UM-QP-196/U
UM-QP-196/U
UN1222
UN1222
U630H16D1K45G1
U630H16D1K45G1
UPD23C16000BLGX
UPD23C16000BLGX
UCC3830DWP-4
UCC3830DWP-4
UA733C
UA733C
UC2903
UC2903
UPD70008AG-6
UPD70008AG-6
UT69RH051W-PX
UT69RH051W-PX
UPD431000AGU-B10-9KH
UPD431000AGU-B10-9KH
UPSD3313AV-40U1T
UPSD3313AV-40U1T
UA78L15ACLPR
UA78L15ACLPR
UVX1HR22MRAY
UVX1HR22MRAY
UPD44324092F5-E50-EQ2
UPD44324092F5-E50-EQ2
UPSD3253AV-24U6
UPSD3253AV-24U6
UVX2F123MRAY
UVX2F123MRAY
UA78L05ACDR
UA78L05ACDR
U2043B-FP
U2043B-FP
UPD8861CY
UPD8861CY
uPSD3233BV-24T1T
uPSD3233BV-24T1T
UPSD3315AV-24T1T
UPSD3315AV-24T1T
UPD720110AGC-8EA
UPD720110AGC-8EA
UPSD3334DV
UPSD3334DV
uPD750064GT
uPD750064GT
UPD16663N
UPD16663N
UL631H256SK35
UL631H256SK35
UPD442000AGU-DD85X-9KH
UPD442000AGU-DD85X-9KH
UT63M105PPXC5
UT63M105PPXC5
UVX0J100MRAY
UVX0J100MRAY
UVX2G470MEA
UVX2G470MEA
UFT14130
UFT14130
UM82C54L
UM82C54L
UC2874L-2
UC2874L-2
UT1553BRTIGPA
UT1553BRTIGPA
UPA1707G
UPA1707G
UM621024
UM621024
UPA1524H
UPA1524H
UC1525
UC1525
USV1E220MFH
USV1E220MFH
UPD753108GC
UPD753108GC
USBDF01W5
USBDF01W5
uA9638CP
uA9638CP
UC1843J
UC1843J
UCY7408N
UCY7408N
UCY7402N
UCY7402N
UGB18CCT
UGB18CCT
UES1002
UES1002
UC1708JE883B
UC1708JE883B
UPSD3314B-40T6
UPSD3314B-40T6
UPD75P238GJ-5BG
UPD75P238GJ-5BG
UPD75P048CW
UPD75P048CW
UDN5742M
UDN5742M
UCC1806J
UCC1806J
UNR4215
UNR4215
UCC2807DTR-2G4
UCC2807DTR-2G4
UF1006
UF1006
UPD703212GCA-xxx-8EU
UPD703212GCA-xxx-8EU
UPSD3235A-40U1
UPSD3235A-40U1
UPA1700A
UPA1700A
ut6264
ut6264
UVX2G222MEA
UVX2G222MEA
UDZ2.0B
UDZ2.0B
UG3003
UG3003
U3760MB-MSD
U3760MB-MSD
UNR221T
UNR221T
UVX1H103MEA
UVX1H103MEA
U2905
U2905
UCC2819PW
UCC2819PW
UCC3580D-4
UCC3580D-4
UPD6122G-002
UPD6122G-002
UC3804X
UC3804X
UGP30J
UGP30J
UVX2D221MPA
UVX2D221MPA
UN9114
UN9114
UCC3580DTR-4G4
UCC3580DTR-4G4
UZ5124
UZ5124
UVX0J183MDA
UVX0J183MDA
UPD120N25TA-E2-AZ
UPD120N25TA-E2-AZ
UPC7915AHF
UPC7915AHF
UC1823BL883B
UC1823BL883B
UPC1423CA1
UPC1423CA1
U62256ADK07
U62256ADK07
UVX1V101MRAY
UVX1V101MRAY
UPD17P236
UPD17P236
uRAM2HS3
uRAM2HS3
UC2844DTR
UC2844DTR
UVX2C332MPA
UVX2C332MPA
UC1625J883B
UC1625J883B
UPB1009K
UPB1009K
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