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參數(shù)資料
| 型號(hào)： | LM3311SQ-HIOP/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.6 A SWITCHING REGULATOR, 1280 kHz SWITCHING FREQ-MAX, QCC24 |
| 封裝： | LEAD FREE, LLP-24 |
| 文件頁數(shù)： | 11/32頁 |
| 文件大?。?/td> | 2504K |
| 代理商： | LM3311SQ-HIOP/NOPB |
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the op-amp. The current from the power pins goes through
the output pin and into the load and feedback loop. The cur-
rent exiting the load and feedback loops then must have a
return path back to the op-amp power supply pins. Ideally this
return path must follow the same path as the output pin trace
to the load. Any deviation that makes the loop area larger be-
tween the output current path and the return current path adds
to the probability of noise pick up.
GATE PULSE MODULATION
The Gate Pulse Modulation (GPM) block is designed to pro-
vide a modulated voltage to the gate driver circuitry of a TFT
LCD display. Operation is best understood by referring to the
GPM block diagram in the Block Diagrams section, the draw-
There are two control signals in the GPM block, VDPM and
VFLK. VDPM is the enable pin for the GPM block. If VDPM is
high, the GPM block is active and will respond to the VFLK
drive signal from the timing controller. However, if VDPM is
low, the GPM block will be disabled and both PMOS switches
P2 and P3 will be turned off. The VGHM node will be dis-
charged through a 1k
resistor and the NMOS switch N2.
When VDPM is high, typical waveforms for the GPM block
can be seen in Figure 2. The pin VGH is typically driven by a
2x or 3x charge pump. In most cases, the 2x or 3x charge
pump is a discrete solution driven from the SW pin and the
output of the boost switching regulator. When VFLK is high,
the PMOS switch P2 is turned on and the PMOS switch P3 is
turned off. With P2 on, the VGHM pin is pulled to the same
voltage applied to the VGH pin. This provides a high gate drive
voltage, VGHM
MAX, and can source current to the gate drive
circuitry. When VFLK is high, NMOS switch N3 is on which
discharges the capacitor CE.
20126384
FIGURE 2.
When VFLK is low, the NMOS switch N3 is turned off which
allows current to charge the C
E capacitor. This creates a de-
lay, t
DELAY, given by the following equations:
t
DELAY 1.265V(CE + 15pF)/ICE
When the voltage on CE reaches about 1.265V and the VFLK
signal is low, the PMOS switch P2 will turn off and the PMOS
switch P3 will turn on connecting resistor R3 to the VGHM pin
through P3. This will discharge the voltage at VGHM at some
rate determined by R3 creating a slope, M
R, as shown in Fig-
ure 2. The VGHM pin is no longer a current source, it is now
sinking current from the gate drive circuitry.
As VGHM is discharged through R3, the comparator con-
nected to the pin V
DD monitors the VGHM voltage. PMOS
switch P3 will turn off when the following is true:
VGHM
MIN 10VXR2/(R1 + R2)
where V
X is some voltage connected to the resistor divider on
pin V
DD. VX is typically connected to the output of the boost
switching regulator. When PMOS switch P3 turns off, VGHM
will be high impedance until the VFLK pin is high again.
GPM block. Waveform (1) is the VGHM pin, (2) is the VFLK
and (3) is the VDPM. The output of the boost switching reg-
ulator is operating at 8.5V and there is a 3x discrete charge
19
www.national.com
LM3311
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3311SQX | 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 |
| LM3311SQX/NOPB | 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 |
| LM3311SQX-HIOP | 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 |
| LM3311SQX-HIOP/NOPB | 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 |
| LM33164D | 制造商:Motorola Inc 功能描述:33164D |
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