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參數(shù)資料
| 型號： | LT3579IUFD-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC20 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-20 |
| 文件頁數(shù)： | 22/40頁 |
| 文件大?。?/td> | 503K |
| 代理商： | LT3579IUFD-1#PBF |
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LT3579/LT3579-1
29
35791f
As with any feedback loop, identifying the gain and phase
contribution of the various elements in the loop is critical.
Figure 18 shows the key equivalent elements of a boost
converter. Because of the fast current control loop, the
powerstageoftheIC,inductoranddiodehavebeenreplaced
by a combination of the equivalent transconductance
amplifier gmp and the current controlled current source
(which converts IVIN to ηVIN
VOUT
IVIN ). Gmp acts as a current
source where the peak input current, IVIN, is proportional
to the VC voltage.
appenDix
1.215V
REFERENCE
IVIN
η VIN
VOUT
IVIN
VOUT
COUT
CPL
RESR
RL
RO
RC
CC
CF
R1
FB
R2
–
+
–
+
35791 F18
gmp
gma
CC: COMPENSATION CAPACITOR
COUT: OUTPUT CAPACITOR
CPL: PHASE LEAD CAPACITOR
CF: HIGH FREQUENCY FILTER CAPACITOR
gma: TRANSCONDUCTOR AMPLIFIER INSIDE IC
gmp: POWER STAGE TRANSCONDUCTANCE AMPLIFIER
RC: COMPENSATION RESISTOR
RL: OUTPUT RESISTANCE DEFINED AS VOUT/ILOADMAX
RO: OUTPUT RESISTANCE OF gma
R1, R2; FEEDBACK RESISTOR DIVIDER NETWORK
RESR: OUTPUT CAPACITOR ESR
η: CONVERTER EFFICIENCY (~90% AT HIGHER CURRENTS)
Figure 18. Boost Converter Equivalent Model
Note that the maximum output currents of gmp and gma
are finite. The output of the gmp stage is limited by the
minimumswitchcurrentlimit(seeElectricalSpecifications)
and gma is nominally limited to about ±12μA.
From Figure 18, the DC gain, poles and zeros can be
calculated as follows:
DC Gain:
ADC = gma RO gmp η
VIN
VOUT
RL
2
0.5R2
R1+0.5R2
Output Pole: P1
=
2
πRL COUT
Error Amp Pole: P2
=
1
2
π RO +RC
(
)CC
Error Amp Zero: Z1
=
1
2
πRC CC
ESR Zero: Z2
=
1
2
πRESR COUT
RHP Zero: Z3
=
VIN 2RL
2
πVOUT 2L
High Frequency Pole: P3
>
fS
3
Phase Lead Zero: Z4
=
1
2
πR1CPL
Phase Lead Pole: P4
=
1
2
π
R10.5R2
R1+0.5R2
CPL
Error Amp Filter Pole:
P5
=
1
2
π
RC RO
RC +RO
CF
, CF <
CC
10
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