參數(shù)資料
型號(hào)： LT1306ES8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Synchronous, Fixed Frequency Step-Up DC/DC Converter
中文描述： 2.3 A SWITCHING REGULATOR, 415 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁(yè)數(shù)： 11/16頁(yè)
文件大?。?/td> 213K
代理商： LT1306ES8
11
LT1306
where
R
MaximumLoad
Output Voltage
MaximumDCLoadCurrent
D
MaximumConverterDutyCycle
L
MAX
=
=
=
=
+
+
V
V
V
O
IN MIN
(
O
–
.
.
)
0 5
0 1
There is also a second pole at the current loop crossover
frequency
ω
C
(Figure 6).
ω
Z
is much lower in frequency
than
ω
C
. The loop is compensated by adjusting the midband
gain with resistor R3 (Figure 7) so that the overall loop gain
crosses 0dB before the minimum frequency RHP zero
(i.e., corresponding to the highest duty ratio). The value of
R3 can be estimated with the fromula:
R
V
D
L
C R
)
O
MAX
3
390
1
=
( –
Due to the low transconductance of the error amplifier, the
gain setting resistor R3 is AC-coupled with capacitor C
Z
.
This prevents R3 from inducing an offset to the input of the
error amplifier. It also creates a pole at DC and a low
frequency zero.
The amplitude response of the error amplifier with the
compensation network shown is:
V
V
g
R
+
1
R
R
S R
+
(
C
S C
S R
C
C
C
C
O
m
Z
Z
P
Z
P
=
+
(
[
)
)
]
>>
2
2
1
3
1
3
APPLICATIO
S I
N
FOR
ATIO
U
W
U
The low frequency zero 1/R3C
Z
of the compensation
network is placed at
ω
P
/2.
C
R
Z
P
=
2
3
ω
The capacitor C
P
ensures adequate gain margin beyond
the RHP zero. The high frequency pole 1/R3C
P
of the
amplifier frequency response is placed beyond
ω
Z
.
C
R
P
Z
=
1
3
3
ω
Higher output filter capacitance rolls off the gain response
from a lower corner frequency so higher midband gain is
required in the compensation network to make the overall
loop gain cross 0dB just below
ω
Z
.
Layout Consideration
To minimize EMI and high frequency resonances, it is
essential to keep the SW and the CAP trace leads as short
as possible. The input and the output bypass capacitors
C
IN
and C
OUT
should be placed close to the IC package and
soldered to the ground plane. A ground plane under the
switching regulator is highly recommended. Figure 8
shows a suggested component placement and PC board
layout.
相關(guān)PDF資料
PDF描述
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參數(shù)描述
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LT1306ES8#TR 功能描述:IC REG BOOST 5V 1A 8SOIC 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(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
LT1306ES8#TRPBF 功能描述:IC REG BOOST 5V 1A 8SOIC 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(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
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