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参数资料
| 型号： | LT3467IS6#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 1.1A SOT23-6 |
| 标准包装： | 500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.26 V ~ 40 V |
| 输入电压： | 2.4 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.3MHz |
| 电流 - 输出： | 1.1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LT3467/LT3467A
APPLICATIONS INFORMATION
2 ? π ? R L ? C OUT
2 ? π ? R O ? C C
Compensation—Theory
Like all other current mode switching regulators, the
LT3467/LT3467A needs to be compensated for stable
and ef?cient 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-
From Figure 6, the DC gain, poles and zeroes can be
calculated as follows:
2
Output Pole: P1=
1
Error Amp Pole: P2=
stand and adjust the voltage feedback loop.
As with any feedback loop, identifying the gain and phase
Error Amp Zero: Z1=
1
2 ? π ? R C ? C C
DC GAIN: A= ? V IN ? g ma ? R O ? g mp ? R L ?
V OUT
ESR Zero: Z2 =
V IN 2 ? R L
f S
contributionofthevariouselementsintheloopiscritical.
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 ampli?er g mp .
g mp acts as a current source where the output current is
proportional to the V C voltage. Note that the maximum
output current of gmp is ?nite due to the current limit
in the IC.
1.255
2
1
2 ? π ? R ESR ? C OUT
RHP Zero: Z3=
2 ? π ? V OUT 2 ? L
High Frequency Pole: P3>
3
1
2
g mp
C PL
R ESR
R L
V OUT
Phase Lead Zero: Z4 =
1
2 ? π ? R1? C PL
V C
R C
R O
g ma
+
–
1.255V
REFERENCE
R1
C OUT
Phase Lead Pole: P4 =
1
2 ? π ? C PL ?
R1? R2
R1 + R2
C C
C C : COMPENSATION CAPACITOR
C OUT : OUTPUT CAPACITOR
C PL : PHASE LEAD CAPACITOR
R2
3467 F06
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.
g ma : TRANSCONDUCTANCE AMPLIFIER INSIDE IC
g mp : POWER STAGE TRANSCONDUCTANCE AMPLIFIER
R C : COMPENSATION RESISTOR
R L : OUTPUT RESISTANCE DEFINED AS V OUT DIVIDED BY I LOAD(MAX)
R O : OUTPUT RESISTANCE OF g ma
R1, R2: FEEDBACK RESISTOR DIVIDER NETWORK
R ESR : OUTPUT CAPACITOR ESR
Figure 6. Boost Converter Equivalent Model
3467afe
10
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