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)： 3/22頁(yè)
文件大?。?/td> 566K
代理商： TL7660IP
www.ti.com
Cascading Devices
1
2
3
4
8
7
6
5
TL7660
"1"
1
2
3
4
8
7
6
5
10 F
+
-
+
-
V+
+
-
10 F
V
= –nV+
OUT
10 F
TL7660
"n"
+
-
10 F
Changing the TL7660 Oscillator Frequency
1
2
3
4
8
7
6
5
TL7660
10 F
+
-
CMOS
Gate
+
–
10 F
V
OUT
V+
–
CMOS VOLTAGE CONVERTER
SCAS794 – JUNE 2006
APPLICATION INFORMATION (continued)
The TL7660 may be cascaded as shown to produced larger negative multiplication of the initial supply voltage
(see Figure 6). However, due to the finite efficiency of each device, the practical limit is 10 devices for light
loads. The output voltage is defined by:
VOUT = –n (VIN)
Where n is an integer representing the number of devices cascaded. The resulting output resistance would be
approximately the weighted sum of the individual TL7660 ROUT values.
Figure 6. Cascading Devices for Increased Output Voltage
It may be desirable in some applications, due to noise or other considerations, to increase the oscillator
frequency. This is achieved by overdriving the oscillator from an external clock, as shown in Figure 7. To prevent
possible device latchup, a 1-k
resistor must be used in series with the clock output. When the external clock
frequency is generated using TTL logic, the addition of a 10-k
pullup resistor to V
CC supply is required. Note
that the pump frequency with external clocking, as with internal clocking, will be 1/2 of the clock frequency.
Output transitions occur on the positive-going edge of the clock.
Figure 7. External Clocking
11
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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TL77 制造商:3M Electronic Products Division 功能描述:ADHESIVE, ANAEROBIC, BOTTLE, 250ML; Adhesive Type:Anaerobic; Chemical Color:Red; Dispensing Method:Bottle; Series:Scotch Weld; Volume:250ml; Adhesive Applications:Thread Locking; Color:Red ;RoHS Compliant: Yes
TL7700 制造商:TI 制造商全稱:Texas Instruments 功能描述:SUPPLY-VOLTAGE SUPERVISOR
TL7700_06 制造商:TI 制造商全稱:Texas Instruments 功能描述:SUPPLY-VOLTAGE SUPERVISOR
TL7700_07 制造商:TI 制造商全稱:Texas Instruments 功能描述:SUPPLY-VOLTAGE SUPERVISOR
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