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參數(shù)資料
| 型號： | ICL7662 |
| 廠商： | Intersil Corporation |
| 英文描述： | CMOS Voltage Converters(CMOS電壓變換器) |
| 中文描述： | CMOS、電壓變換器 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 88K |
| 代理商： | ICL7662 |
3-52
Output Ripple
ESR also affects the ripple voltage seen at the output. The
total ripple is determined by 2V, A and B, as shown in Figure
16. Segment A is the voltage drop across the ESR of C
2
at
the instant it goes from being charged by C
1
(current flowing
into C
2
) to being discharged through the load (current
flowing out of C
2
). The magnitude of this current change is 2
x I
OUT
, hence the total drop is 2 x I
OUT
x ESRC
2
V. Segment
B is the voltage change across C
2
during time t
2
, the half of
the cycle when C
2
supplies current the load. The drop at B is
I
OUT
x t
2
/C
2
V. The peak-to-peak ripple voltage is the sum of
these voltage drops:
Again, a low ESR capacitor will result in a higher
performance output.
Paralleling Devices
Any number of ICL7662 voltage converters may be
paralleled (Figure 18) to reduce output resistance. The
reservoir capacitor, C
2
, serves all devices while each device
requires its own pump capacitor, C
1
. The resultant output
resistance would be approximately:
Cascading Devices
The ICL7662 may be cascaded as shown in Figure 19 to
produce larger negative multiplication of the initial supply
voltage. However, due to the finite efficiency of each device,
the practical limit is 10 devices for light loads. The output
voltage is defined by:
V
OUT
= -n(V
IN
),
where n is an integer representing the number of devices
cascaded. The resulting output resistance would be
approximately the weighted sum of the individual ICL7662
R
OUT
values.
1
2
3
4
8
7
6
5
+
-
10
μ
F
10
μ
F
ICL7662
V
OUT
= -V+
C
2
V+
+
-
R
O
V
OUT
V+
+
-
16A.
16B.
C
1
FIGURE 16. SIMPLE NEGATIVE CONVERTER AND ITS
OUTPUT EQUIVALENT
V
RIPPLE
PUMP
2
-----------------------------------------
2 ESRC
2
I
OUT
×
+
R
OUT
=
R
OUT
(of ICL7662)
n (number of devices)
FIGURE 17. OUTPUT RIPPLE
FIGURE 18. PARALLELING DEVICES
A
t
2
t
1
B
0
-(V+)
V
1
2
3
4
8
7
6
5
ICL7662
“1”
V+
C
1
1
2
3
4
8
7
6
5
ICL7662
“N”
C
1
R
L
C
2
+
-
ICL7662
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL7662 WAF | 制造商:Harris Corporation 功能描述: |
| ICL7662CBA | 功能描述:電荷泵 CMOS Voltage Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| ICL7662CBA+ | 功能描述:電荷泵 CMOS Voltage Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| ICL7662CBA+T | 功能描述:電荷泵 CMOS Voltage Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| ICL7662CBA-T | 功能描述:電荷泵 CMOS Voltage Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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