- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377971 > ML4870 (Fairchild Semiconductor Corporation) High Current Boost Regulator with Load Disconnect(負(fù)載可分離的大電流升壓穩(wěn)壓器) PDF資料下載
參數(shù)資料
| 型號： | ML4870 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Current Boost Regulator with Load Disconnect(負(fù)載可分離的大電流升壓穩(wěn)壓器) |
| 中文描述： | 高電流升壓穩(wěn)壓器與負(fù)載斷開（負(fù)載可分離的大電流升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 80K |
| 代理商： | ML4870 |
ML4870
6
REV. 1.0 10/12/2000
OUTPUT CAPACITOR
The output capacitor filters the pulses of current from the
switching regulator. Since the switching frequency will
vary with inductance, the minimum output capacitance
required to reduce the output ripple to an acceptable
level will be a function of the inductor used. Therefore, to
maintain an output voltage with less than 100mV of ripple
at full load current, use the following equation:
C
L
V
OUT
OUT
=
×
44
(3)
The output capacitor’s Equivalent Series Resistance (ESR)
and Equivalent Series Inductance (ESL), also contribute to
the ripple. Just after the Q1 turns off, the current in the
DEISGN CONSIDERATIONS
(Continued)
Figure 4. I
OUT
vs. V
IN
Using the Circuit of Figure 8
Figure 5. Efficiency vs. I
OUT
Using the Circuit of Figure 8
1000
800
600
400
200
0
I
VIN (V)
1.0
2.0
3.0
5.0
4.0
VOUT = 3.3V
VOUT = 5V
90
80
70
60
E
IOUT (mA)
1
10
100
1000
VOUT = 3.3V
VOUT = 5V
VIN = 2.4V
350
300
250
200
150
100
50
0
I
VIN (V)
1.0
3.0
5.0
7.0
Figure 6. Input Leakage vs. V
IN
in Shutdown
Figure 7. No Load Input Current vs. V
IN
output capacitor ramps quickly to between 0.5A and
1.3A. This fast change in current through the capacitor’s
ESL causes a high frequency (5ns) spike to appear on the
output. After the ESL spike settles, the output still has a
ripple component equal to the inductor discharge current
times the ESR. To minimize these effects, choose an
output capacitor with less than 10nH of ESL and less than
100m
of ESR.
Suitable tantalum capacitors can be obtained from the
following vendors:
AVX
(207) 282-5111
Kemet
(846) 963-6300
Sprague
(207) 324-4140
80
60
40
20
0
I
VIN (V)
1.0
2.0
3.0
5.0
4.0
VOUT = 3.3V
VOUT = 5V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4872 | High Current Boost Regulator with Shutdown(帶關(guān)斷電路的大電流升壓穩(wěn)壓器) |
| ML4875 | High Current Boost Regulator with Shutdown(帶關(guān)斷電路的大電流升壓穩(wěn)壓器) |
| ML4876 | LCD Backlight Lamp Driver(LCD背光燈驅(qū)動器) |
| ML4877 | LCD Desktop Backlight Lamp Driver(LCD桌面背光燈驅(qū)動器) |
| ML4880 | Portable PC/PCMCIA Power Controller(便攜式PC/PCMCIA電源控制器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4870CS3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4870CS-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator with Load Disconnect |
| ML4870CS-5 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator with Load Disconnect |
| ML4870ES-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator with Load Disconnect |
| ML4870ES-5 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator with Load Disconnect |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。