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)： 20/28頁
文件大小： 540K
代理商： MAX1514ETP
M
TFT-LCD Power-Supply Controllers
20
______________________________________________________________________________________
Because V
SENSE
would be greater than 100mV, the cir-
cuit in Figure 9 should be used and the scale factor is:
Calculate R
S1
and R
S2
:
The closest 1% standard values for R
S1
and R
S2
are
866
and 1.13k
, respectively.
If the 2.2μH inductor used in the typical operating cir-
cuit (Figures 1 and 2) has a typical DCR of 10m
and a
maximum DCR of 14m
, the RC time constant of the
sense network is:
Select C
S
= 0.1μF, R
S
is:
Assuming
T is 40
°
C and TC is 0.5%, the worst-case
high sense voltage over temperature is:
(
Because V
SENSE
would be much less than 80mV, the
circuit in Figure 10 can be used to improve the current-
limit accuracy. Calculate R
S3
and R
S4
:
The closest 1% standard values for R
S3
and R
S4
are
2.61k
and 14.0
, respectively.
Output-Capacitor Selection
The output capacitor and its equivalent series resistance
(ESR) affect the circuit’s stability, output voltage ripple,
and transient response. The
Output-Capacitor Stability
Requirement
section discusses the output capacitance
requirement based on the loop stability. This section
deals with how to determine the output capacitance
according to the ripple voltage and load-transient
requirements.
The total output voltage ripple has two components: the
ohmic ripple due to the capacitor’s equivalent series
resistance (ESR), and the capacitive ripple caused by
the charging and discharging of the output capacitance:
where V
MAIN
is the output voltage of the step-up regu-
lator, I
MAIN
is the output current, C
OUT
is the output
capacitance, R
ESR
is the ESR of the output capacitor,
f
OSC
is the switching frequency, and I
PEAK
is the peak
inductor current (see the
Inductor Selection
section).
V
V
V
V
I
R
V
I
C
V
V
f
OSC
V
RIPPLE
RIPPLE ESR
≈
RIPPLE( )
RIPPLE ESR
PEAK
ESR
RIPPL( )
MAIN
OUT
MAIN
MAIN
IN
+
×
×
×
(
)
(
)
=
≈
-
R
V
V
0 044
=
V
R
S
S
3
4
15
.5V - .1V
-
1
4
0
2600
2614
2614
2600
14
4 5
-
×
=
=
=
5V -
V
A
m
C
mV
SENSE
=
×
+
×
°
)
=
2 6
.
14
1
0 005
.
40
44
R
s
F
S
.
=
=
220
0 1
2200
μ
μ
τ
μ
μ
.
=
=
2 2
10
220
H
m
s
R
R
S
S
1
2
489
0 571
856
1
856
0 571
.
1139
.
0 571
-
=
=
=
=
SF
mV
mV
0 571
=
=
100
175
V
A
m
C
mV
SENSE
=
×
+
×
°
(
)
=
2 6
.
56
1
0 005
.
40
175
MAX1513
MAX1514
L
R
S3
C
S
V
IN
V
MAIN
C
S+
C
S-
GATE
GND
FB
R
S4
Figure 10. Lossless Current Sensing with V
SENSE
< 80mV
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1514ETP+T 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(guān)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(guān)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(guān)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(guān)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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