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| 型號(hào)： | LM4510SD/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | LM4510 Synchronous Step-Up DC/DC Converter with True Shutdown Isolation; Package: LLP; No of Pins: 10; Qty per Container: 1000/Reel |
| 中文描述： | 1.8 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, DSO10 |
| 封裝： | 3 X 3 MM, 0.80 MM HEIGHT, LEAD FREE, LLP-10 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 2467K |
| 代理商： | LM4510SD/NOPB |
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TABLE 3. Suggested C
IN and COUT Capacitors and Their Suppliers
Model
Type
Vendor
Voltage Rating
Case Size
Inch (mm)
4.7 F for C
IN
C2012X5R0J475
Ceramic, X5R
TDK
6.3V
0805 (2012)
GRM21BR60J475
Ceramic, X5R
muRata
6.3V
0805 (2012)
JMK212BJ475
Ceramic, X5R
Taiyo-Yuden
6.3V
0805 (2012)
C2012X5R0J475K
Ceramic, X5R
TDK
6.3V
0603 (1608)
10 F for C
OUT
TMK316BJ106KL
Ceramic, X5R
Taiyo-Yuden
25V
1206 (3216)
12103D106KAT2A
Ceramic, X5R
AVX
25V
1210 (3225)
SOFT-START FUNCTION AND SOFT-START
CAPACITOR SELECTION
The LM4510 has a soft-start pin that can be used to limit the
input inrush current. Connect a capacitor from SS pin to GND
to set the soft-start period. Figure 6 describes the soft start
process.
Initial charging period: When the device is turned on, the
control circuitry linearly regulating initial charge current
charges V
OUT by limiting the inrush current.
Soft-start period: After V
OUT reaches VIN -0.7V (typ.), the
device starts switching and the C
S is charged at a constant
current of 11
μA, ramping up to V
IN. This period ends when
V
SS reaches VFB. CS should be large enough to ensure
soft-start period ends after C
O is fully charged.
During the initial charging period, the required load current
must be smaller than the initial charge current to ensure
V
OUT reaches VIN -0.7V (typ.).
30031023
FIGURE 6. Soft Start Timing Diagram
C
S Selection
The soft-start time without load can be estimated as:
Where the I
INIT_CHARGE is Initial Charging Current depending
on V
IN and ISS_CHARGE (11 μA (typ.)). Also, when selecting the
fuse current rating, make sure the value is higher than the
initial charging current.
COMPENSATION COMPONENT SELECTION
The LM4510 provides a compensation pin COMP to cus-
tomize the voltage loop feedback. It is recommended that a
series combination of R
C and CC1 be used for the compen-
sation network, as shown in the typical application circuit. In
addition, C
C2 is used for compensating high frequency zeros.
The series combination of R
C and CC1 introduces a pole-zero
pair according to the following equations:
In addition, C
C2 introduces a pole according to the following
equation:
Where R
O is the output impedance of the error amplifier, ap-
proximately 1 M
, and amplifier voltage gain is typically 200
V/V depending on temperature and V
IN.
Refer to Table 4 for suggested soft start capacitor and com-
pensation components.
TABLE 4. Suggested C
S and Compensation Components
Model
Type
Vendor
Voltage Rating
Case Size
Inch (mm)
(C
S) C1608C0G1E103J
Ceramic, X5R
TDK
6.3V
603 (1608)
(C
1)TMK107SD222JA-T
Ceramic, X5R
Taiyo Yuden
25V
603 (1608)
(R
C) 9t06031A4642FBHFT
Resistor
Yageo Corporation
1/10W
603 (1608)
13
www.national.com
LM4510
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4510SDX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Synchronous Step-Up DC/DC Converter with True Shutdown Isolation |
| LM4510SDX/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 |
| LM4540 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC ’97 Codec with National 3D Sound |
| LM4540VH | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| LM4540VHX | 功能描述:IC AUDIO CODEC '97 18BIT 48LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調(diào)變:是 S/N 比，標(biāo)準(zhǔn) ADC / DAC (db):81.5 / 88 動(dòng)態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR) |
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