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參數(shù)資料
| 型號： | LT3467IS6#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 2/18頁 |
| 文件大?。?/td> | 266K |
| 代理商： | LT3467IS6#TR |
LT3467/LT3467A
10
3467afe
APPLICATIONS INFORMATION
Compensation—Theory
Like all other current mode switching regulators, the
LT3467/LT3467A needs to be compensated for stable
and efcient operation. Two feedback loops are used in
the LT3467/LT3467A: a fast current loop which does not
require compensation, and a slower voltage loop which
does. Standard Bode plot analysis can be used to under-
stand and adjust the voltage feedback loop.
As with any feedback loop, identifying the gain and phase
contribution of the various elements in the loop is critical.
Figure 6 shows the key equivalent elements of a boost
converter. Because of the fast current control loop, the
power stage of the IC, inductor and diode have been re-
placed by the equivalent transconductance amplier gmp.
gmp acts as a current source where the output current is
proportional to the VC voltage. Note that the maximum
output current of gmp is nite due to the current limit
in the IC.
From Figure 6, the DC gain, poles and zeroes can be
calculated as follows:
Output Pole: P1=
2
π RL COUT
Error Amp Pole: P2=
1
2
π RO CC
Error Amp Zero: Z1=
1
2
π RC CC
DC GAIN: A=
1.255
VOUT
2 VIN gma RO gmp RL
1
2
ESR Zero: Z2
=
1
2
π RESR COUT
RHP Zero: Z3=
VIN
2 R
L
2
π VOUT
2 L
High Frequency Pole: P3>
fS
3
Phase Lead Zero: Z4
=
1
2
π R1CPL
Phase Lead Pole: P4
=
1
2
π CPL
R1R2
R1
+R2
The current mode zero is a right-half plane zero which can
be an issue in feedback control design, but is manageable
with proper external component selection.
–
+
–
+
gma
RC
RO
R2
CC: COMPENSATION CAPACITOR
COUT: OUTPUT CAPACITOR
CPL: PHASE LEAD CAPACITOR
gma: TRANSCONDUCTANCE AMPLIFIER INSIDE IC
gmp: POWER STAGE TRANSCONDUCTANCE AMPLIFIER
RC: COMPENSATION RESISTOR
RL: OUTPUT RESISTANCE DEFINED AS VOUT DIVIDED BY ILOAD(MAX)
RO: OUTPUT RESISTANCE OF gma
R1, R2: FEEDBACK RESISTOR DIVIDER NETWORK
RESR: OUTPUT CAPACITOR ESR
3467 F06
R1
COUT
CPL
RL
RESR
VOUT
VC
CC
gmp
1.255V
REFERENCE
Figure 6. Boost Converter Equivalent Model
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| LT3467AIDDB#TR | 2.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LT3468 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Photoflash Capacitor Chargers in ThinSOT |
| LT3468-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Photoflash Capacitor Chargers in ThinSOT |
| LT3468-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Photoflash Capacitor Chargers in ThinSOT |
| LT3468ES5 | 制造商:Linear Technology 功能描述:Photo Flash Charger 5-Pin TSOT-23 制造商:Linear Technology 功能描述:SPECIALTY ANALOG CIRCUIT, PDSO5 |
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