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參數(shù)資料
| 型號： | ML4770 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 2 Cell, Adjustable Output, High Current Boost Regulator with Load Disconnect(兩單元、負(fù)載可分離的可調(diào)輸出、高電流升壓穩(wěn)壓器) |
| 中文描述： | 2細(xì)胞，可調(diào)輸出，高電流升壓負(fù)載斷開（兩單元，負(fù)載可分離的可調(diào)輸出，高電流升壓穩(wěn)壓器穩(wěn)壓器） |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 249K |
| 代理商： | ML4770 |
ML4770
6
REV. 1.0 10/10/2000
DESIGN 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)
1.5
2.5
3.5
5.5
4.5
VOUT = 3V
VOUT = 5.5V
90
80
70
60
E
IOUT (mA)
1
10
100
1000
VOUT = 3V
VOUT = 5.5V
VIN = 2.4V
Figure 6. Input Leakage vs. V
IN
in Shutdown
Figure 7. No Load Input Current vs. V
IN
350
300
250
200
150
100
50
0
I
VIN (V)
1.0
3.0
5.0
7.0
160
120
80
40
0
I
VIN (V)
1.5
2.5
3.5
5.5
4.5
VOUT = 3V
VOUT = 5.5V
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:
(2)
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
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
C
L
V
OUT
OUT
44
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4770CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:2 Cell, Adjustable Output, High Current Boost Regulator with Load Disconnect |
| ML4770ES | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:2 Cell, Adjustable Output, High Current Boost Regulator with Load Disconnect |
| ML4770ESX | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4770EX | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4771 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator |
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