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参数资料
| 型号： | LM25119PSQX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, QCC32 |
| 封装： | 5 X 5 MM, LLP-32 |
| 文件页数： | 15/24页 |
| 文件大小： | 694K |
| 代理商： | LM25119PSQX |
PCB Board Layout
Recommendations
The LM25119 consists of two integrated regulators operating
almost independently. Crosstalk between the two regulators
under certain conditions may be observed as switch jitter.
This effect is common for any dual channel regulator. Cross-
talk effects are usually most severe when one channel is
operating around 50% duty cycle. Careful layout practices
help to minimize this effect. The following board layout guide-
lines apply specifically to the LM25119 and should be fol-
lowed for best performance.
1.
Keep the Loop1 and Loop2, shown in Figure 15, as small
as possible
2.
Keep the signal and power grounds separate
3.
Place VCC capacitors (C6, C7) and VIN capacitor (C9)
as closes as possible to the LM25119
4.
Route CS and CSG traces together with Kelvin
connection to the sense resistor
5.
Connect AGND and PGND directly to the underside
exposed pad
6.
Ensure there are no high current paths beneath the
underside exposed pad
Switching Jitter Root Causes and Solutions
1.
Noise coupling of the high frequency switching between
two channels through the input power rail
A.
Keep the high current path as short as possible
B.
Choose a FET with minimum lead inductance
C.
Place local bypass capacitors (C
IN1, CIN2) as close
as possible to the high-side FETs to isolate one
channel from the high frequency noise of the other
channel
D.
Slow down the SW switching speed by increasing
gate resistors R29 and R30
E.
Minimize the effective ESR/ESL of the input
capacitor by paralleling input capacitors
2.
High frequency AC noise on FB, CS, CSG and COMP
A.
Use the star ground PCB layout technique and
minimize the length of the high current path
B.
Keep the signal traces away from the SW, HO, HB
traces and the inductor
C.
Add an R-C filter between the CS and CSG pins
D.
Place CS filter capacitor (C30, C31) next to the
LM25119 and on the same PCB layer as the
LM25119
3.
Ground offset at the switching frequency
A.
Use the star ground PCB layout technique and
minimize the length between the grounds of C
IN1and
C
IN2
30126222
FIGURE 15. Recommended PCB Layout
www.national.com
22
LM25119
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM25119PSQX/NOPB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM25119QPSQ/NOPB | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:IC REG CTRLR BUCK PWM CM 32-LLP 制造商:Texas Instruments 功能描述:LM25119QPSQ/NOPB |
| LM25119QPSQX/NOPB | 制造商:Texas Instruments 功能描述:IC REG CTRLR BUCK PWM CM 32-LLP 制造商:Texas Instruments 功能描述:Dual Synchronous Buck Controller |
| LM2512 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Mobile Pixel Link Level 0, 24-Bit RGB Display Interface Serializer with Dithering and Look Up Table Option |
| LM-2512 | 制造商:ROHM 制造商全称:Rohm 功能描述:16 x 32 matrix display |
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