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參數資料
| 型號： | NCP7662 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | INDUCTORLESS VOLTAGE CONVERTER |
| 中文描述： | 電感電壓轉換器 |
| 文件頁數： | 7/12頁 |
| 文件大?。?/td> | 152K |
| 代理商： | NCP7662 |
NCP7662
http://onsemi.com
7
Figure 9. Positive Voltage Multiplier
4
1
2
3
8
7
6
5
N
D1
V+
+
C2
+
D2
VOUT =
(2 V+) – (2 VF)
C1
Combined Negative Voltage Conversion and Positive
Supply Multiplication
Figure 10 combines the functions shown in Figures 3 and
9 to provide negative voltage conversion and positive
voltage doubling simultaneously. This approach would be,
for example, suitable for generating +9 V and –5 V from an
existing +5 V supply. In this instance, capacitors C1
and C3
perform the pump and reservoir functions, respectively, for
the generation of the negative voltage, while capacitors C2
and C4 are pump and reservoir, respectively, for the doubled
positive voltage. There is a penalty in this configuration
which combines both functions, however, in that the source
impedances of the generated supplies will be somewhat
higher due to the finite impedance of the common charge
pump driver at pin 2 of the device.
Figure 10. Combined Negative Converter and
Positive Doubler
N
D1
+
C2
+
D2
4
1
2
3
8
7
6
5
+
C3
+
C4
C1
VOUT =
(2 V+) – (2 VF)
V+
VOUT =
–(V+) – (VF)
Voltage Splitting
The bidirectional characteristics can also be used to split
a higher supply in half, as shown in Figure 11. The combined
load will be evenly shared between the two sides and a high
value resistor to the LV pin ensures start–up. Because the
switches share the load in parallel, the output impedance is
much lower than in the standard circuits, and higher currents
can be drawn from the device. By using this circuit, and then
the circuit of Figure 6, +15 V can be converted (via +7.5 V
and –7.5 V) to a nominal –15 V, though with rather high
series resistance (
250
).
Figure 11. Splitting a Supply in Half
4
1
2
3
8
7
6
5
N
+
–
RL1
+
–
+
–
RL2
50
μ
F
50
μ
F
V+
V–
50
μ
F
VOUT =
(V+) – (V–)
2
Regulated Negative Voltage Supply
In some cases, the output impedance of the NCP7662 can
be a problem, particularly if the load current varies
substantially. The circuit of Figure 12 can be used to
overcome this by controlling the input voltage, via the
MC33201 op amp, in such a way as to maintain a nearly
constant output voltage. Direct feedback is advisable, since
the NCP7662’s output does not respond instantaneously to
change in input, but only after the switching delay. The
circuit shown supplies enough delay to accommodate the
NCP7662, while maintaining adequate feedback. An
increase in pump and storage capacitors is desirable, and the
values shown provide an output impedance of less than 5
to a load of 10 mA.
Figure 12. Regulating the Output Voltage
10
μ
F
VOUT
V+
4
1
2
3
8
7
6
5
N
+
–
100 k
+
–
100
–
+
50 k
+8 V
100
μ
F
800 k
100
μ
F
50 k
56 k
+8 V
250 K
VOLTAGE
ADJUST
MC33201
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP7662/D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Inductorless Voltage Converter |
| NCP7662DR2 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:INDUCTORLESS VOLTAGE CONVERTER |
| NCP7662P | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:ON Semiconductor 功能描述: |
| NCP7800 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1.0 A Positive Voltage Regulators |
| NCP7805ACTG | 功能描述:穩(wěn)壓二極管 ANA 1A 5V VREG RoHS:否 制造商:Vishay Semiconductors 齊納電壓:12 V 電壓容差:5 % 電壓溫度系數:0.075 % / K 齊納電流: 功率耗散:3 W 最大反向漏泄電流:3 uA 最大齊納阻抗:7 Ohms 最大工作溫度:+ 150 C 安裝風格:SMD/SMT 封裝 / 箱體:DO-214AC 封裝:Reel |
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