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參數(shù)資料
| 型號： | LM3211MTX-ADJ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Step-up PWM DC/DC Converter Integrated with 4 Buffers |
| 中文描述： | SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 17/21頁 |
| 文件大?。?/td> | 821K |
| 代理商： | LM3211MTX-ADJ |
Operation
(Continued)
LAYOUT CONSIDERATIONS
The LM3211 uses two separate ground connections, GND
for the driver and NMOS power device of the boost regulator
and AGND for the sensitive analog control circuitry of the
boost regulator and the V
COM
and Gamma buffers. The
AGND and GND pins should be tied directly together at the
package, see
Figure 3
and
Figure 4
. The feedback, softstart,
and compensation networks should be connected directly to
a dedicated analog ground plane and this ground plane must
connect to the AGND pin, as in
Figure 3
. If no analog ground
plane is available then the ground connections of the feed-
back, softstart, and compensation networks must tie directly
to the AGND pin, as show in
Figure 4
. Connecting these
networks to the GND pin can inject noise into the system and
effect performance. For 600kHz operation the FSLCT pin
should be tied to an analog ground plane or directly to the
AGND pin. For 1.25MHz operation the FSLCT pin should be
tied to the V
IN
pin.
The input bypass capacitor C
must be placed close to the
IC. This will reduce copper trace resistance which effects
input voltage ripple of the IC. For additional input voltage
filtering, a 100nF bypass capacitor can be placed in parallel
with C
, close to the V
pin, to shunt any high frequency
noise to ground. The output capacitor, C
, should also be
placed close to the IC. Any copper trace connections for the
C
capacitor can increase the series resistance, which
directly effects output voltage ripple and efficiency. The feed-
back network, resistors R1 and R2, should be kept close to
the FB pin, and away from the inductor, to minimize copper
trace connections that can inject noise into the system.
Trace connections made to the inductor and schottky diode
should be minimized to reduce power dissipation and in-
crease overall efficiency.
The layout of the Gamma buffer traces is important to mini-
mize noise injected into them. Route all input and output
traces for the buffers away from the inductor and the high
power switching traces used for the boost switcher. For best
performance route these traces on the opposite side of the
board from the high current switching traces and use a
ground plane between the two sides for shielding.
20062252
FIGURE 3. Multi-Layer Layout
20062253
FIGURE 4. Single Layer Layout
L
www.national.com
17
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|---|---|
| LM3211MTX-ADJ/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 安裝風格: 封裝 / 箱體:CPAK |
| LM3212 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LM3212 PRODUCT BRIEF Step-Down DC-DC Converter with Analog Bypass Mode for RF Power Amplifiers |
| LM3212TL/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM3212TLX/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM3215TL/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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