công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

TC1240 bảng dữ liệu(PDF) 7 Page - Microchip Technology

tên linh kiện TC1240
Giải thích chi tiết về linh kiện  Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1240 bảng dữ liệu(HTML) 7 Page - Microchip Technology

Back Button TC1240 Datasheet HTML 3Page - Microchip Technology TC1240 Datasheet HTML 4Page - Microchip Technology TC1240 Datasheet HTML 5Page - Microchip Technology TC1240 Datasheet HTML 6Page - Microchip Technology TC1240 Datasheet HTML 7Page - Microchip Technology TC1240 Datasheet HTML 8Page - Microchip Technology TC1240 Datasheet HTML 9Page - Microchip Technology TC1240 Datasheet HTML 10Page - Microchip Technology TC1240 Datasheet HTML 11Page - Microchip Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 16 page
background image
 2003 Microchip Technology Inc.
DS21516C-page 7
TC1240/TC1240A
4.0
DETAILED DESCRIPTION
The TC1240/TC1240A charge pump converter dou-
bles the voltage applied to the VIN pin. Conversion con-
sists of a two-phase operation (Figure 4-1). During the
first phase, switches S2 and S4 are open and S1 and S3
are closed. During this time, C1 charges to the voltage
on VIN and load current is supplied from C2. During the
second phase, S2 and S4 are closed, while S1 and S3
are open.
During this second phase, C1 is level-shifted upward by
VIN volts. This connects C1 to the reservoir capacitor
C2, allowing energy to be delivered to the output as
needed. The actual voltage is slightly lower than 2 x VIN
since the four switches (S1-S4) have an on-resistance
and the load drains charge from reservoir capacitor C2.
FIGURE 4-1:
Ideal Switched Capacitor
Charge Pump Doubler.
5.0
TYPICAL APPLICATIONS
5.1
Output Voltage Considerations
The TC1240/TC1240A performs voltage doubling but
does not provide regulation. The output voltage will
droop in a linear manner with respect to load current.
The value of this equivalent output resistance is approx-
imately 12
Ω nominal at +25°C and VIN = +5.0V for the
TC1240A and 17
Ω nominal at +25°C and VIN = +2.8V
for the TC1240. VOUT is approximately +10.0V at light
loads for the TC1240A and +5.6V for the TC1240, and
droops according to the equation below:
EQUATION
5.2
Charge Pump Efficiency
The overall power efficiency of the charge pump is
affected by four factors:
1.
Losses from power consumed by the internal
oscillator, switch drive, etc. (which vary with
input voltage, temperature
and oscillator
frequency).
2.
I2R losses due to the on-resistance of the
MOSFET switches on-board the charge pump.
3.
Charge pump capacitor losses due to effective
series resistance (ESR).
4.
Losses that occur during charge transfer (from
commutation capacitor to the output capacitor)
when a voltage difference between the two
capacitors exist.
Most of the conversion losses are due to factors (2) and
(3) above. These losses are given by Equation 5-1.
EQUATION 5-1:
VOUT = 2 x VIN
C1
C2
TC1240/TC1240A
VIN
S1
S3
S4
S2
OSC
VIN
VOUT 2VIN VDROOP
×
=
VDROOP
IOUT ROUT
×
=
a)
b)
PLOSS(2,3)
IOUT
2
ROUT
×
=
ROUT
1
FSW C1
()
----------------------
8RSWITCH 4ESRC1 ESRC2
++
+
=


Số phần tương tự - TC1240

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Microchip Technology
TC1240 MICROCHIP-TC1240 Datasheet
858Kb / 11P
   Positive Doubling Charge Pump with Shutdown in SOT Package
2001
logo
TelCom Semiconductor, I...
TC1240 TELCOM-TC1240 Datasheet
531Kb / 9P
   Positive Doubling Charge Pump with Shutdown in SOT Package
logo
Microchip Technology
TC1240A MICROCHIP-TC1240A Datasheet
253Kb / 18P
   Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package
2001-2012 11/29/12
TC1240AECH MICROCHIP-TC1240AECH Datasheet
253Kb / 18P
   Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package
2001-2012 11/29/12
TC1240ECH MICROCHIP-TC1240ECH Datasheet
858Kb / 11P
   Positive Doubling Charge Pump with Shutdown in SOT Package
2001
More results

Mô tả tương tự - TC1240

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Microchip Technology
TC1240 MICROCHIP-TC1240_13 Datasheet
253Kb / 18P
   Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package
2001-2012 11/29/12
TC1240 MICROCHIP-TC1240 Datasheet
858Kb / 11P
   Positive Doubling Charge Pump with Shutdown in SOT Package
2001
logo
TelCom Semiconductor, I...
TC1240 TELCOM-TC1240 Datasheet
531Kb / 9P
   Positive Doubling Charge Pump with Shutdown in SOT Package
logo
Maxim Integrated Produc...
MAX1852 MAXIM-MAX1852 Datasheet
217Kb / 8P
   SC70 Inverting Charge Pumps with Shutdown
logo
Linear Technology
LTC1754-3.3 LINER-LTC1754-3.3 Datasheet
205Kb / 12P
   Micropower, Regulated 3.3V/5V Charge Pump with Shutdown in SOT-23
LTC1754-5 LINER-LTC1754-5_15 Datasheet
216Kb / 12P
   Micropower, Regulated 3.3V/5V Charge Pump with Shutdown in SOT-23
LTC1754-3.3 LINER-LTC1754-3.3_15 Datasheet
216Kb / 12P
   Micropower, Regulated 3.3V/5V Charge Pump with Shutdown in SOT-23
LTC1517-5 LINER-LTC1517-5 Datasheet
210Kb / 8P
   Micropower, Regulated 5V Charge Pump in a 5-Pin SOT-23 Package
LTC1517-5 LINER-LTC1517-5_15 Datasheet
161Kb / 8P
   Micropower, Regulated 5V Charge Pump in a 5-Pin SOT-23 Package
LTC1517-3.3 LINER-LTC1517-3.3_15 Datasheet
161Kb / 8P
   Micropower, Regulated 3.3V Charge Pump in a 5-Pin SOT-23 Package
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


bảng dữ liệu tải về

Go To PDF Page


Link URL




Chính sách bảo mật
ALLDATASHEET.VN
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
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