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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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