參數(shù)資料
型號(hào)： TL7660IP
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHED CAPACITOR CONVERTER, 9 kHz SWITCHING FREQ-MAX, PDIP8
封裝： ROHS COMPLIANT, PLASTIC, DIP-8
文件頁(yè)數(shù)： 5/22頁(yè)
文件大?。?/td> 566K
代理商： TL7660IP
www.ti.com
Combined Negative Voltage Conversion and Positive Supply Doubling
1
2
3
4
8
7
6
5
TL7660
V+
C
2
D
1
D
2
C
1
+
-
+
-
C
3
+
-
C
4
+
-
V
= –(nV – V
)
OUT
IN
FDX
V
= (2V+) – (V
) – (V
)
OUT
FD1
FD2
Voltage Splitting
1
2
3
4
8
7
6
5
TL7660
+
-
+
-
V+
V–
+
-
50 F
R
L1
R
L2
50 F
V
=
OUT
2
V+
V
CMOS VOLTAGE CONVERTER
SCAS794 – JUNE 2006
APPLICATION INFORMATION (continued)
Figure 10 combines the functions shown in Figure 3 and Figure 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 that combines
both functions, however, in that the source impedances of the generated supplies are somewhat higher, due to
the finite impedance of the common charge pump driver at terminal 2 of the device.
Figure 10. Combined Negative-Voltage Converter and Positive-Voltage Doubler
The bidirectional characteristics can also be used to split a higher supply in half (see Figure 11. The combined
load is evenly shared between the two sides. 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, although with rather high series output resistance (~250
).
Figure 11. Splitting a Supply in Half
13
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
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