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參數(shù)資料
| 型號： | TC7660COA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| 中文描述： | 電荷泵型DC - DC電壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 131K |
| 代理商： | TC7660COA |
4-56
TELCOM SEMICONDUCTOR, INC.
TC7660
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
The TC7660 approaches these conditions for negative
voltage multiplication if large values of C
1
and C
2
are used.
Energy is lost only in the transfer of charge between
capacitors if a change in voltage occurs.
The energy lost
is defined by:
E = 1/2 C
1
(V
12
– V
22
)
V
1
and V
2
are the voltages on C
1
during the pump and
transfer cycles. If the impedances of C
1
and C
2
are relatively
high at the pump frequency (refer to Figure 2), compared to
the value of R
L
, there will be a substantial difference in
voltages V
1
and V
2
. Therefore, it is not only desirable to
make C
2
as large as possible to eliminate output voltage
ripple, but also to employ a correspondingly large value for
C
1
in order to achieve maximum efficiency of operation.
Dos and Don'ts
Do not exceed maximum supply voltages.
Do not connect LV terminal to GND for supply voltages
greater than 3.5V.
Do not short circuit the output to V
+
supply for voltages
above 5.5V for extended periods; however, transient
conditions including start-up are okay.
When using polarized capacitors in the inverting mode,
the + terminal of C
1
must be connected to pin 2 of the
TC7660 and the + terminal of C
2
must be connected to
GND Pin 3.
Simple Negative Voltage Converter
Figure 3 shows typical connections to provide a nega-
tive supply where a positive supply is available. A similar
scheme may be employed for supply voltages anywhere in
the operating range of +1.5V to +10V, keeping in mind that
pin 6 (LV) is tied to the supply negative (GND) only for supply
voltages below 3.5V.
Figure 3. Simple Negative Converter
Paralleling Devices
Any number of TC7660 voltage converters may be
paralleled to reduce output resistance (Figure 4). The reser-
voir capacitor, C
2
, serves all devices, while each device
requires its own pump capacitor, C
1
. The resultant output
resistance would be approximately:
R
OUT
(of TC7660)
n (number of devices)
R
OUT
=
2
2
π
f
C
1
The output characteristics of the circuit in Figure 3 are
those of a nearly ideal voltage source in series with 70
.
Thus, for a load current of – 10mA and a supply voltage of
+5V, the output voltage would be – 4.3V.
The dynamic output impedance of the TC7660 is due,
primarily, to capacitive reactance of the charge transfer
capacitor (C
1
). Since this capacitor is connected to the
output for only 1/2 of the cycle, the equation is:
X
C
= = 3.18
,
where f = 10kHz and C
1
= 10
μ
F.
1
2
3
4
8
7
6
5
TC7660
10
μ
F
+
V
+
10
μ
F
+
VOUT
*
1. VOUT= –n V+for 1.5V
≤
V+
≤
10V
NOTES:
*
C1
C2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC7660IJA | CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC7660SEJA | SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC7660HCOA | IC-CMOS- BINARY COUNTER |
| TC7660EPA | RF CONNECTOR; SMA FEMALE, BULKHEAD, PC MOUNT |
| TC7660EV | Charge Pump DC-TO-DC Voltage Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC7660COA | 制造商:Microchip Technology Inc 功能描述:ICS POWER SUPPLY PACKAGE/CASE:8-SOIC |
| TC7660COA713 | 功能描述:電荷泵 DC-DC 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 |
| TC7660COATR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:+5V To 【10V Voltage Converter |
| TC7660CPA | 功能描述:電荷泵 DC-DC 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 |
| TC7660CPA | 制造商:TELCOM SEMICONDUCTOR 功能描述:IC VOLT CONVERTER 7660 DIP8 |
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