參數(shù)資料
型號(hào)： 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(yè)數(shù)： 19/28頁(yè)
文件大小： 540K
代理商： MAX1514ETP
M
TFT-LCD Power-Supply Controllers
______________________________________________________________________________________
19
5) If V
SENSE
is greater than 100mV, the current-feed-
back signal is too high and can trip the current limit
before the full load current is delivered. Use the cur-
rent-sense configuration in Figure 9 to attenuate the
sense signal. Define the scale factor (SF) as:
Calculate R
S1
and R
S2
:
6) If V
SENSE
is less than 80mV, the current-feedback
signal is low relative to the current-limit threshold. Use
the Figure 8 configuration, or, if good current-limit
accuracy is desired, use the optional current-sense
configuration in Figure 10 to increase the amplitude of
the sense signal. Calculate R
S3
and R
S4
:
If the 2.2μH inductor used in the typical operating cir-
cuit (Figures 1 and 2) had a typical DCR of 24m
and a
maximum DCR of 30m
, the RC time constant of the
sense network would be:
Select C
S
= 0.1μF and calculate R
S
:
Assuming
T is 40
°
C and TC is 0.5%, the worst-case
high sense voltage over temperature is:
Because V
SENSE
would be between 80mV and 100mV,
the circuit in Figure 8 should be used. The closest 1%
standard value for R
S
is 909
.
If the 2.2μH inductor used in the typical operating cir-
cuit (Figures 1 and 2) has a typical DCR of 45m
and a
maximum DCR of 56m
, the RC time constant of the
sense network is:
Select C
S
= 0.1μF and calculate R
S
:
Assuming
T is 40
°
C and TC is 0.5%, the worst-case
high sense voltage over temperature is:
R
s
F
S
.
.
=
=
48 9
0 1
489
μ
μ
τ
μ
μ
.
.
=
=
2 2
45
48 9
H
m
s
V
A
m
C
mV
SENSE
2 6
×
(
.
×
.
=
+
°
)
=
30
1
0 005
40
93 6
R
s
F
S
.
.
=
=
91 7
0 1
917
μ
μ
τ
μ
μ
.
.
=
=
2 2
24
91 7
H
m
s
R
V
V
V
100
V
R
mV
V
R
R
R
S
MAIN
IN MIN
(
MAIN
-
IN MIN
(
SENSE
S
S
S
S
3
4
3
-
-
×
)
+
)
=
=
-
R
R
SF
R
R
SF
SF
S
S
S
S
1
1
2
1
-
×
=
=
SF
mV
V
SENSE
=
100
MAX1513
MAX1514
L
R
S
C
S
V
IN
V
MAIN
C
S+
C
S-
GATE
GND
FB
Figure 8. Lossless Current Sensing with 80mV < V
SENSE
< 100mV
MAX1513
MAX1514
L
R
S1
C
S
V
IN
V
MAIN
C
S+
C
S-
GATE
GND
FB
R
S2
Figure 9. Lossless Current Sensing with V
SENSE
> 100mV
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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(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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(fēng)格: 封裝 / 箱體:CPAK
MAX1514ETP-T 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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(fēng)格: 封裝 / 箱體:CPAK
MAX1515ETG 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MAX1515ETG+ 功能描述:直流/直流開(kāi)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(kāi)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MAX1515ETG+T 功能描述:直流/直流開(kāi)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(kāi)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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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