Zakładka z wyszukiwarką danych komponentów
  Polish  ▼
ALLDATASHEET.PL

X  

TC7660EV Arkusz danych(PDF) 6 Page - Microchip Technology

Numer części TC7660EV
Szczegółowy opis  CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Producent  MICROCHIP [Microchip Technology]
Strona internetowa  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7660EV Arkusz danych(HTML) 6 Page - Microchip Technology

Back Button TC7660EV Datasheet HTML 2Page - Microchip Technology TC7660EV Datasheet HTML 3Page - Microchip Technology TC7660EV Datasheet HTML 4Page - Microchip Technology TC7660EV Datasheet HTML 5Page - Microchip Technology TC7660EV Datasheet HTML 6Page - Microchip Technology TC7660EV Datasheet HTML 7Page - Microchip Technology TC7660EV Datasheet HTML 8Page - Microchip Technology TC7660EV Datasheet HTML 9Page - Microchip Technology TC7660EV Datasheet HTML 10Page - Microchip Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 12 page
background image
6
TC7660
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
© 2001 Microchip Technology Inc.
DS21465A
TC7660-7 9/30/96
The TC7660 approaches these conditions for negative
voltage multiplication if large values of C1 and C2 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 C1 (V12 – V22)
V1 and V2 are the voltages on C1 during the pump and
transfer cycles. If the impedances of C1 and C2 are relatively
high at the pump frequency (refer to Figure 2), compared to
the value of RL, there will be a substantial difference in
voltages V1 and V2. Therefore, it is not only desirable to
make C2 as large as possible to eliminate output voltage
ripple, but also to employ a correspondingly large value for
C1 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 C1 must be connected to pin 2 of the
TC7660 and the + terminal of C2 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, C2, serves all devices, while each device
requires its own pump capacitor, C1. The resultant output
resistance would be approximately:
ROUT (of TC7660)
n (number of devices)
ROUT =
2
2
πf C1
The output characteristics of the circuit in Figure 3 are
those of a nearly ideal voltage source in series with 70
Ω.
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 (C1). Since this capacitor is connected to the
output for only 1/2 of the cycle, the equation is:
XC =
= 3.18
Ω,
where f = 10kHz and C1 = 10µF.
1
2
3
4
8
7
6
5
TC7660
10
µF
+
V
+
10
µF
+
VOUT*
1. VOUT = –n V
+
for 1.5V
V
+
10V
NOTES:
*
C1
C2


Podobny numer części - TC7660EV

ProducentNumer częściArkusz danychSzczegółowy opis
logo
Microchip Technology
TC7660EV MICROCHIP-TC7660EV Datasheet
92Kb / 11P
   Charge Pump DC-TO-DC Voltage Converter
2001
TC7660EV MICROCHIP-TC7660EV Datasheet
76Kb / 8P
   HIGH FREQUENCY 7660 DC-TO-DC VOLTAGE CONVERTER
2001
TC7660EV MICROCHIP-TC7660EV Datasheet
95Kb / 11P
   SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
2001
TC7660EV MICROCHIP-TC7660EV Datasheet
92Kb / 11P
   CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
2001
TC7660EV MICROCHIP-TC7660EV Datasheet
98Kb / 11P
   SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
01/09/01
More results

Podobny opis - TC7660EV

ProducentNumer częściArkusz danychSzczegółowy opis
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


Arkusz danych Pobierz

Go To PDF Page


Link URL




Polityka prywatności
ALLDATASHEET.PL
Czy Alldatasheet okazała się pomocna?  [ DONATE ] 

O Alldatasheet   |   Reklama   |   Kontakt   |   Polityka prywatności   |   Linki   |   Lista producentów
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