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參數(shù)資料
| 型號： | LT3460ESC6 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3MHz Step-Up DC/DC Converter in SC70 and ThinSOT |
| 中文描述： | 0.6 A SWITCHING REGULATOR, 1700 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | PLASTIC, SC-70, 6 PIN |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 211K |
| 代理商： | LT3460ESC6 |
LT3460
5
3460f
The LT3460 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:
G
K
s C
P s)
=
1
2
,
where C2 is the output capacitance, and K1 is a constant
based on the operating point of the converter. In continu-
ous current mode, K1 increases as the duty cycle de-
creases.
The internal compensation network R
C
, C
C
can be approxi-
mated as follows in medium frequency range:
G
K
s R
C
s C
C( )
C
C
C
=
+
2
1
The zero
f
R
C
Z
C
C
=
π
1
2
OPERATIOU
Feedback Loop Compensation
The LT3460 has an internal feedback compensation net-
work 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 compensation net-
work cannot satisfy all applications. A properly designed
external feed forward capacitor from V
OUT
to FB (C
F
in
Figure 2) will correct the loop compensation for most
applications.
In order to improve the phase margin, a feed-forward
capacitor C
F
in Figure 2 can be used.
Without the feed-forward capacitor, the transfer function
from V
OUT
to FB is:
FB
V
OUT
R
+
R
R
=
1
1
2
With the feed-forward capacitor C
F
, the transfer function
becomes:
FB
V
OUT
R
+
R
R
s R
R
R
1
C
s
R
R
C
F
F
=
+
+
+
1
1
2
2
1
1
2
2
1
The feed-forward capacitor C
F
generates a zero and a pole.
The zero always appears before the pole. The frequency
distance between the zero and the pole is determined only
by the ratio between V
OUT
and FB. To give maximum phase
FREQUENCY (kHz)
PHASE
GAIN
1
G
60
50
40
30
20
P
10
0
–10
–20
–30
–40
90
45
0
–45
–90
–135
–180
–225
–270
–315
–360
10
100
1000
3460 F03
is about 70kHz.
The feedback loop gain T(s) = K3 G
P
(s) G
C
(s). If it
crosses over 0dB far before f
Z
, the phase margin will be
small. Figure 3 is the Bode plot of the feedback loop gain
measured from the converter shown in Figure 2 without
the feedforward capacitor C
F
. The result agrees with
the previous discussion: Phase margin of about 20
°
is
insufficient.
OFF ON
V
IN
5V
L1
22
μ
H
D1
R2
130k
R1
15k
C2
1
μ
F
C
22pF
C1
4.7
μ
F
V
OUT
12V
70mA
5
1
3
2
4
V
IN
SW
FB
SHDN
GND
LT3460
C1: TAIYO YUDEN X5R JMK212BJ475KG
C2: TAIYO YUDEN X5R EMK316BJ105
D1: CENTRAL SEMICONDUCTOR CMDSH2-3
L1: MURATA LQH32CN-220 OR EQUIVALENT
3460 F02
Figure 2. 5V to 12V Step-Up Converter
Figure 3
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT3460ES5 | 1.3MHz Step-Up DC/DC Converter in SC70 and ThinSOT |
| LT3461AES6 | 1.3MHz/3MHz Step-Up DC/DC Converters with Integrated Schottky in ThinSOT |
| LT3461ES6 | 1.3MHz/3MHz Step-Up DC/DC Converters with Integrated Schottky in ThinSOT |
| LT3461 | 1.3MHz/3MHz Step-Up DC/DC Converters with Integrated Schottky in ThinSOT |
| LT3461A | 1.3MHz/3MHz Step-Up DC/DC Converters with Integrated Schottky in ThinSOT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3460ESC6#TR | 功能描述:IC REG BOOST ADJ 0.3A SC706 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT3460ESC6#TRM | 功能描述:IC REG BOOST ADJ 0.3A SC70-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT3460ESC6#TRMPBF | 功能描述:IC REG BOOST ADJ 0.3A SC70-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT3460ESC6#TRPBF | 功能描述:IC REG BOOST ADJ 0.3A SC70-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT3460ESC6-1#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 2.5V to 16V 6-Pin SC-70 |
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