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參數(shù)資料
| 型號： | ML4869 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Medium Current Boost Regulator with Load Disconnect(負(fù)載可分離的中等電流升壓穩(wěn)壓器) |
| 中文描述： | 中等電流升壓穩(wěn)壓器斷開負(fù)載（負(fù)載可分離的中等電流升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 82K |
| 代理商： | ML4869 |
ML4869
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
output capacitor ramps quickly to between 0.3A and
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
Figure 6. Input Leakage vs. V
IN
in Shutdown
Figure 7. No Load Input Current vs. V
IN
0.9A. 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 product of inductor
discharge current and 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
I
VIN (V)
600
500
400
300
200
100
0.0
1.50
2.50
5.00
4.00
2.00
3.00
4.50
3.50
VOUT = 5V
VOUT = 3.3V
80
70
60
50
40
30
20
I
VIN (V)
3
5
4
1
2
VOUT = 5V
VOUT = 3.3V
95.0
90.0
85.0
80.0
75.0
E
IOUT (mA)
0.1
1
10
1000
100
VOUT = 5V
VOUT = 3.3V
250
200
150
100
50
0
I
VIN (V)
0
1
2
3
4
5
8
6
7
VOUT = 5V
VOUT = 3.3V
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|---|---|
| ML4869CS-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Medium Current Boost Regulator with Load Disconnect |
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