データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

TC7660IJA データシート(PDF) 7 Page - Microchip Technology

部品番号 TC7660IJA
部品情報  CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7660IJA データシート(HTML) 7 Page - Microchip Technology

Back Button TC7660IJA Datasheet HTML 3Page - Microchip Technology TC7660IJA Datasheet HTML 4Page - Microchip Technology TC7660IJA Datasheet HTML 5Page - Microchip Technology TC7660IJA Datasheet HTML 6Page - Microchip Technology TC7660IJA Datasheet HTML 7Page - Microchip Technology TC7660IJA Datasheet HTML 8Page - Microchip Technology TC7660IJA Datasheet HTML 9Page - Microchip Technology TC7660IJA Datasheet HTML 10Page - Microchip Technology TC7660IJA Datasheet HTML 11Page - Microchip Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 12 page
background image
7
TC7660
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
© 2001 Microchip Technology Inc.
DS21465A
TC7660-7 9/30/96
Figure 5. Increased Output Voltage by Cascading Devices
Figure 4. Paralleling Devices Lowers Output Impedance
device latch-up, a 1k
Ω resistor must be used in series with
the clock output. In a situation where the designer has
generated the external clock frequency using TTL logic, the
addition of a 10k
Ω pull-up resistor to V+ 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.
It is also possible to increase the conversion efficiency
of the TC7660 at low load levels by lowering the oscillator
frequency. This reduces the switching losses, and is achieved
by connecting an additional capacitor, COSC, as shown in
Figure 7. Lowering the oscillator frequency will cause an
undesirable increase in the impedance of the pump (C1) and
the reservoir (C2) capacitors. To overcome this, increase the
values of C1 and C2 by the same factor that the frequency
has been reduced. For example, the addition of a 100pF
capacitor between pin 7 (OSC) and pin 8 (V+) will lower the
oscillator frequency to 1kHz from its nominal frequency of
10kHz (a multiple of 10), and necessitate a corresponding
increase in the values of C1 and C2 (from 10µF to 100µF).
Cascading Devices
The TC7660 may be cascaded as shown (Figure 6) to
produce larger negative multiplication of the initial supply
voltage. 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 ap-
proximately the weighted sum of the individual TC7660
ROUT values.
Changing the TC7660 Oscillator Frequency
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 exter-
nal clock, as shown in Figure 6. In order to prevent possible
1
2
3
4
8
7
6
5
TC7660
V
+
1
2
3
4
8
7
6
5
TC7660
C1
RL
C2
C1
"n"
"1"
+
1
2
3
4
8
7
6
5
V
+
1
2
3
4
8
7
6
5
10
µF
10
µF
"n"
"1"
10
µF
VOUT
1. VOUT = –n V
+
for 1.5V
V
10V
+
NOTES:
*
*
+
+
+
TC7660
TC7660


同様の部品番号 - TC7660IJA

メーカー部品番号データシート部品情報
logo
TelCom Semiconductor, I...
TC7660IJA TELCOM-TC7660IJA Datasheet
131Kb / 9P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
logo
Microchip Technology
TC7660IJA MICROCHIP-TC7660IJA Datasheet
386Kb / 18P
   Charge Pump DC-to-DC Voltage Converter
2002
TC7660IJA MICROCHIP-TC7660IJA Datasheet
1Mb / 20P
   Charge Pump DC-to-DC Voltage Converter
11/29/11
More results

同様の説明 - TC7660IJA

メーカー部品番号データシート部品情報
logo
ON Semiconductor
MC7660 ONSEMI-MC7660 Datasheet
191Kb / 12P
   Charge Pump DC-to-DC Voltage Converter
February, 2000 ??Rev. 2
logo
Microchip Technology
TC1044S MICROCHIP-TC1044S Datasheet
92Kb / 11P
   Charge Pump DC-TO-DC Voltage Converter
2001
logo
TelCom Semiconductor, I...
TC1044S TELCOM-TC1044S Datasheet
141Kb / 8P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
TC7662B TELCOM-TC7662B Datasheet
133Kb / 9P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
logo
Microchip Technology
TC7660 MICROCHIP-TC7660_16 Datasheet
1Mb / 20P
   Charge Pump DC-to-DC Voltage Converter
11/29/11
TC7660 MICROCHIP-TC7660_02 Datasheet
386Kb / 18P
   Charge Pump DC-to-DC Voltage Converter
2002
logo
TelCom Semiconductor, I...
TC7660 TELCOM-TC7660 Datasheet
131Kb / 9P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
logo
Microchip Technology
TC7662B MICROCHIP-TC7662B Datasheet
92Kb / 11P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
2001
TC7660S MICROCHIP-TC7660S Datasheet
95Kb / 11P
   SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
2001
logo
TelCom Semiconductor, I...
TC7660S TELCOM-TC7660S Datasheet
136Kb / 8P
   SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com