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| 型号： | LT3460EDC-1#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.18A 6DFN |
| 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 ~ 36 V |
| 输入电压： | 2.5 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 650kHz |
| 电流 - 输出： | 180mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-DFN-EP（2x2） |
LT3460/LT3460-1
BLOCK DIAGRAM
V IN
V OUT
R1 (EXTERNAL)
1.255V
REFERENCE
+
–
A1
R C
COMPARATOR
–
A2
+
R
S
Q
DRIVER
Q1
SW
FB
R2 (EXTERNAL)
FB
C C
+
0.1Ω
–
SHUTDOWN
R S (EXTERNAL)
SHDN
RAMP
GENERATOR
C S (EXTERNAL)
1.3MHz
R S , C S OPTIONAL SOFT-START COMPONENTS
OSCILLATOR
GND
3460 BD
Figure 1. Block Diagram, LT3460
OPERATION
The LT3460/LT3460-1 uses a constant frequency, current
mode control scheme to provide excellent line and load
regulation. Operation can be best understood by referring to
the block diagram in Figure 1. At the start of each oscillator
cycle, the SR latch is set, which turns on the power switch
Q1. A voltage proportional to the switch current is added
to a stabilizing ramp and the resulting sum is fed into the
positive terminal of the PWM comparator A2. When this
FB (C F in Figure 2) will correct the loop compensation for
most applications.
The LT3460/LT3460-1 uses peak current mode control.
The current feedback makes the inductor very similar
to a current source in the medium frequency range. The
power stage transfer function in the medium frequency
range can be approximated as:
voltage exceeds the level at the negative input of A2, the
SR latch is reset turning off the power switch. The level at
G P(s) =
K1
s ? C2 ,
the negative input of A2 is set by the error ampli?er A1, and
is simply an ampli?ed version of the difference between
the feedback voltage and the reference voltage of 1.255V.
In this manner, the error ampli?er sets the correct peak
current level to keep the output in regulation. If the error
ampli?er’s output increases, more current is delivered to
where C2 is the output capacitance, and K1 is a constant
based on the operating point of the converter. In continuous
current mode, K1 increases as the duty cycle decreases.
The internal compensation network R C , C C can be ap-
proximated as follows in medium frequency range:
the output; if it decreases, less current is delivered.
Feedback Loop Compensation
The LT3460/LT3460-1 has an internal feedback compensa-
G C(s) = K2 ?
The zero
s ? R C ? C C + 1
s ? C C
tion network as shown in Figure 1 (R C and C C ). However,
because the small signal characteristics of a boost converter
change with operation conditions, the internal compensa-
f Z =
1
2 ? ? R C ? C C
tion network cannot satisfy all applications. A properly
designed external feed forward capacitor from V OUT to
is about 70kHz.
3460fb
5
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