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參數(shù)資料
| 型號： | LM2631MTC-ADJ/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 683K |
| 代理商： | LM2631MTC-ADJ/NOPB |
Design Procedure (Continued)
6.
Minimize the trace from the center of the output resistor
divider to the FB pin and keep it away from noise
sources to avoid noise pickup. A dedicated sense trace
(separated from the power trace) can be used to con-
nect the top of the resistor divider to the output. The
sense trace ensures tight regulation at the output.
Application Circuits
A typical application circuit is shown in Figure 2, with some of
the components values shown in Table 1.
TABLE 1. Components for Typical 2.5V, 300kHz Application Circuits
Input Voltage
4.75V to 24V
4.5V to 6V
Output Current
4A
10A
Application
Notebook
Desktop
Q1 and Q2
Fairchild FDS6680; Siliconix Si4410DY;
or International Rectifier IRF7805
Fairchild FDB7030L; or Motorola
MTB75N03HDL
Inductor L1
Sumida CDRH127-7R6: 7.6 H, 5.9A
Pulse PE-53681: 2.5 H, 11.4A
Input Capacitors
2 x 22F, 35V Sprague 593D or TPS
2 x 220 F, 10V Sanyo OS-CON SA
Output Capacitors
2 x 220F, 10V Sprague 593D or TPS
3 x 330 F, 6.3V Sanyo OS-CON SA
Rectifier D1
Motorola MBRS140T3
Motorola MBRS340T3
Sensing Resistor R3
15 m
IRC
3x20m
IRC
Compensation components C8 and R8
R8 = 3.3 K
,C8=1nF
R8=4K
,C8=1nF
When the input voltage is low (less than 5V), the bootstrap
function cannot deliver enough gate voltage to fully drive the
high-side MOSFET on, which increases Rdson, and conse-
quently reduces efficiency. An external charge-pump doubler
can be added to double the CBOOT pin voltage (see Figure
3). It can also be added to the VIN pin to increase the gate
drive voltage at both high-side and low-side MOSFETs.
10093704
FIGURE 2. The Typical 2.5V Application Circuit
LM2631
www.national.com
10
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