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參數(shù)資料
| 型號： | TL7660CD |
| 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, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 4/22頁 |
| 文件大?。?/td> | 566K |
| 代理商： | TL7660CD |
www.ti.com
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TL7660
+
-
+
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+
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+
-
V+
C
OSC
V
OUT
C
1
C
2
Positive Voltage Doubling
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TL7660
V+
V
= (2V+) – (2VF)
OUT
D
1
D
2
C
1
C
2
CMOS VOLTAGE CONVERTER
SCAS794 – JUNE 2006
APPLICATION INFORMATION (continued)
It is also possible to increase the conversion efficiency of the TL7660 at low load levels by lowering the oscillator
frequency (see Figure 8). This reduces the switching losses. However, lowering the oscillator frequency causes
an undesirable increase in the impedance of the pump (C
1) and reservoir (C2) capacitors; this is overcome by
increasing the values of C
1 and C2 by the same factor that the frequency has been reduced. For example, the
addition of a 100-pF capacitor between terminal 7 (OSC) and V
CC lowers the oscillator frequency to 1 kHz from
its nominal frequency of 10 kHz (a multiple of 10), and thereby necessitate a corresponding increase in the
value of C
1 and C2 (from 10 F to 100 F).
Figure 8. Lowering Oscillator Frequency
The TL7660 may be used to achieve positive voltage doubling using the circuit shown in Figure 9. In this
application, the pump inverter switches of the TL7660 are used to charge C1 to a voltage level of VCC – VF
(where VCC is the supply voltage and VF is the forward voltage drop of diode D1). On the transfer cycle, the
voltage on C1 plus the supply voltage (VCC) is applied through diode D2 to capacitor C2. The voltage thus
created on C2 becomes (2VCC) – (2VF) or twice the supply voltage minus the combined forward voltage drops of
diodes D1 and D2.
The source impedance of the output (VOUT) depends on the output current.
Figure 9. Positive-Voltage Doubler
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|---|---|
| TL7660CD | 制造商:Texas Instruments 功能描述:DC/DC Charge Pump Converter IC |
| TL7660CDG4 | 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 |
| TL7660CDGKR | 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 |
| TL7660CDGKRG4 | 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 |
| TL7660CDGKT | 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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