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參數(shù)資料
| 型號： | MAX1513ETP |
| 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)： | 14/28頁 |
| 文件大?。?/td> | 540K |
| 代理商： | MAX1513ETP |
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M
TFT-LCD Power-Supply Controllers
14
______________________________________________________________________________________
input PWM comparator, the flip-flop is reset and the
MOSFET turns off. Since the inductor current is continu-
ous, a transverse potential develops across the inductor
that turns on the diode (D1). The voltage across the
inductor then becomes the difference between the out-
put voltage and the input voltage. This discharge condi-
tion forces the current through the inductor to ramp
down, transferring the energy stored in the magnetic
field to the output capacitor and the load. The N-channel
MOSFET is kept off for the rest of the clock cycle.
Current Limiting and
Current-Sense Amplifier (CS+, CS-)
The internal current-limit circuit resets the PWM flip-flop
and turns off the external power MOSFET whenever the
voltage difference between CS+ and CS- exceeds
125mV (typ). The tolerance on this current limit is
±
20%. Use the minimum value of the current limit to
select components of the current-sense network.
Lossless Current Sense
The lossless current-sense method uses the DC resis-
tance (DCR) of the inductor as the sense element.
Figure 5 shows a simplified step-up regulator using the
basic lossless current-sensing method. An RC network
is connected in parallel with the step-up inductor (L).
The voltage across the sense capacitor (C
S
) is the
input to the current-sense amplifier. To prevent the
sense amplifier from seeing large common-mode
switching voltages, the sense capacitor should always
be connected to the nonswitching end of the inductor
(i.e., the input of the step-up regulator).
Lossless current sense can be easily understood using
complex frequency domain analysis. The voltage
across the inductor is given by:
where L is the inductance, R
L
is the DCR of the induc-
tor, and I
L
is the inductor current. The voltage across
the sense capacitor is given by:
where R
S
is the series resistor in the sense network and
C
S
is the sense capacitor. The above equation can be
rewritten as:
Therefore, the sense capacitor voltage is directly pro-
portional to the inductor current if the time constant of
the RC sense network matches the time constant of the
inductor/DCR. The sense method is equivalent to using
a current-sense resistor that has the same value as the
inductor DCR.
V
sL
+
1
R
sR C
I
sL R
sR C
R I
LL
If
L
R
R C
then the equation becomes
V
R I
S
L
L
L
L
S
+
+
1
/
,
:
=
=
+
=
=
1
V
sR C
V
S
L
+
1
=
1
V
I sL
R
L
L
+
=
)
Σ
CLOCK
RESET DOMINANT
ILIM
COMPARATOR
S
R
Q
125mV
LEVEL
SHIFT
SLOPE_COMP
TO
FAULT LOGIC
1.0V
SOFT-START
BLOCK
REF
FB
CS-
CS+
GATE
MAX1513
MAX1514
R
L
L
INDUCTOR
R
S
C
S
+ V
S
-
V
IN
V
MAIN
C
S+
C
S-
GATE
GND
FB
Figure 4. Step-Up Regulator-Controller Functional Diagram
Figure 5. Step-Up Regulator Using Lossless Current Sensing
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| MAX1518BETJ | TFT-LCD DC-DC Converter with Operational Amplifiers |
| MAX1538ETI | Power-Source Selector for Dual-Battery Systems |
| MAX154 | CMOS High-Speed 4-Bit ADCs with Multiplexer and Reference(8位,4通道,400ksps,并行A/D轉(zhuǎn)換器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1513ETP+ | 功能描述:顯示驅(qū)動(dòng)器和控制器 TFT-LCD Power Supply Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1513ETP+T | 功能描述:顯示驅(qū)動(dòng)器和控制器 TFT-LCD Power Supply Controller RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1513ETP-T | 功能描述:顯示驅(qū)動(dòng)器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX1513EVKIT | 功能描述:電源管理IC開發(fā)工具 MAX1513/14 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX1514ETP | 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(fēng)格: 封裝 / 箱體:CPAK |
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