參數(shù)資料
型號： MAX1514ETP
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： TFT-LCD Power-Supply Controllers
中文描述： SWITCHING CONTROLLER, 1725 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 4 X 4 MM, 0.80 MM HEIGHT, MO-220-VGGD, TQFN-20
文件頁數(shù)： 18/28頁
文件大?。?/td> 540K
代理商： MAX1514ETP
M
TFT-LCD Power-Supply Controllers
18
______________________________________________________________________________________
taken from an appropriate curve in the
Typical
Operating Characteristics
, and an estimate of LIR
based on the above paragraphs:
Choose an available inductor value from an appropriate
inductor family. Calculate the maximum DC input cur-
rent at the minimum input voltage (V
IN(MIN)
) using the
following equation:
The expected efficiency at that operating point (
η
MIN
)
can be taken from an appropriate curve in the
Typical
Operating Characteristics.
Calculate the ripple current at that operating point and
the peak current required for the inductor:
The inductor’s saturation current rating and the
MAX1513/MAX1514s’ current limit (I
LIM
) should exceed
I
PEAK
, and the inductor’s DC current rating should
exceed I
IN(DC, MAX)
.
Considering the typical operating circuit, the maximum
load current (I
MAIN(MAX)
) is 400mA for I
MAIN
directly
and 30mA for REG G to provide V
GAMMA
. The one-
stage negative charge pump provides 30mA to REG N
for V
GOFF
, and the one-stage positive charge pump
provides 20mA to REG P for V
GON
. Altogether, the
effective maximum output current (I
MAIN(EFF)
) is 500mA
with a 15V output and a typical 5V input voltage. The
switching frequency is set to 1.5MHz. Choosing an
LIR of 0.6 and estimating efficiency of 85% at this
operating point:
Using the circuit’s minimum input voltage (4.5V) and
estimating efficiency of 80% at that operating point:
The ripple current and the peak current are:
The inductor DCR should be low enough for reasonable
efficiency. As a rule of thumb, do not allow the voltage
drop across the inductor DCR to exceed a few percent
of the input voltage at I
PEAK
.
Many notebook panel designs have height constraints
on the components. If a thin inductor with the required
current rating is not available, use two thin inductors in
series or parallel.
Current-Sense Network Selection
After selecting the inductor, use the following steps to
design the current-sense network for lossless current
sensing.
1) Calculate the RC time constant of the sense network
using the typical inductance and typical DCR:
2) Determine the component values of the sense net-
work. Select C
S
, and then calculate R
S
using:
3) Calculate the worst-case high sense voltage over
temperature using the maximum DCR value (R
L(MAX)
)
found in the inductor technical specifications:
where I
PEAK
is the peak inductor current calculated in
the
Inductor Selection
section, TC is the temperature
coefficient of copper (0.5%/°C) and
T is the difference
between the specified temperature for R
L(MAX)
and the
maximum expected inductor temperature.
4) Compare the calculated sense voltage with the mini-
mum value of the current-limit threshold in the
Electrical
Characteristics
(100mV). If the sense voltage is between
80mV and 100mV, use the current-sense configuration
in Figure 8 with the calculated C
S
and R
S
above.
V
I
R
TC
T
SENSE
PEAK
L MAX
(
×
×
(
×
)
=
+
)
1
R
C
S
S
=
τ
τ
(
)
=
L
R
L TYP
I
V
H
V
1 5
V
MHz
V
A
I
A
A
A
RIPPLE
PEAK
.
μ
×
1 0
.
.
1 0
2 1
+
.
2 6
=
×
(
)
≈
≈
4 5
15
15
4 5
2 2
2
-
I
A
V
V
A
IN DC MAX
(
,
)
.
0 8
.
2 1
=
×
≈
0 5
4 5
15
L
V
V
V
1 5
V
MHz
A
H
.
.
.
2 2
=
≈
5
15
15
5
0 5
0 85
0 6
2
-
μ
I
V
V
V
L
V
f
I
I
I
RIPPLE
IN MIN
(
MAIN
IN MIN
(
MAIN
OSC
PEAK
IN DC MAX
(
RIPPLE
2
×
×
)
)
,
)
=
×
(
)
=
+
-
I
I
V
V
IN DC MAX
(
,
MAIN EFF
MAIN
IN MIN
(
MIN
)
(
)
)
×
× η
=
L
V
V
V
V
I
f
LIR
IN
MAIN
MAIN
(
IN
OSC
MAIN EFF
TYP
η
)
×
=
2
-
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相關代理商/技術參數(shù)
參數(shù)描述
MAX1514ETP+T 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
MAX1514ETP-T 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
MAX1515ETG 功能描述:直流/直流開關調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MAX1515ETG+ 功能描述:直流/直流開關調(diào)節(jié)器 3A 1MHz Step-Down DDR Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MAX1515ETG+T 功能描述:直流/直流開關調(diào)節(jié)器 3A 1MHz Step-Down DDR Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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