поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

UC2577T-ADJG3 датащи(PDF) 4 Page - Texas Instruments

номер детали UC2577T-ADJG3
подробное описание детали  Simple Step-Up Voltage Regulator
Download  14 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

UC2577T-ADJG3 датащи(HTML) 4 Page - Texas Instruments

  UC2577T-ADJG3 Datasheet HTML 1Page - Texas Instruments UC2577T-ADJG3 Datasheet HTML 2Page - Texas Instruments UC2577T-ADJG3 Datasheet HTML 3Page - Texas Instruments UC2577T-ADJG3 Datasheet HTML 4Page - Texas Instruments UC2577T-ADJG3 Datasheet HTML 5Page - Texas Instruments UC2577T-ADJG3 Datasheet HTML 6Page - Texas Instruments UC2577T-ADJG3 Datasheet HTML 7Page - Texas Instruments UC2577T-ADJG3 Datasheet HTML 8Page - Texas Instruments UC2577T-ADJG3 Datasheet HTML 9Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 4 / 14 page
background image
The Block Diagram shows a step-up switching regulator
utilizing the UC2577. The regulator produces an output
voltage higher than the input voltage. The UC2577 turns
its switch on and off at a fixed frequency of 52kHz, thus
storing energy in the inductor (L). When the NPN switch
is on, the inductor current is charged at a rate of VIN/L.
When the switch is off, the voltage at the SWITCH termi-
nal of the inductor rises above VIN, discharging the
stored current through the output diode (D) into the out-
put capacitor (COUT) at a rate of (VOUT - VIN)/L. The en-
ergy stored in the inductor is thus transferred to the
output.
The output voltage is controlled by the amount of energy
transferred, which is controlled by modulating the peak
inductor current. This modulation is accomplished by
feeding a portion of the output voltage to an error ampli-
fier which amplifies the difference between the feedback
voltage and an internal 1.23V precision reference volt-
age. The output of the error amplifier is then compared to
a voltage proportional to the switch current, or the induc-
tor current, during the switch on time. A comparator ter-
minates the switch on time when the two voltages are
equal and thus controls the peak switch current to main-
tain a constant output voltage. Figure 2 shows voltage
and current waveforms for the circuit. Formulas for calcu-
lation are shown in Figure 3.
STEP-UP REGULATOR DESIGN PROCEDURE
Refer to the Block Diagram
Given:
VINmin = Minimum input supply voltage
VOUT = Regulated output voltage
UC2577-ADJ
Step-up (Boost) Regulator
Duty Cycle
D
VOUT
+ VF − VIN
VOUT
+ VF VSAT
VOUT
− VIN
VOUT
Avg. Inductor
Current
IIND(AVG)
ILOAD
1
D
Inductor
Current Ripple
∆IIND
VIN
− VSAT
L
D
52,000
Peak Inductor
Current
IIND(PK)
ILOAD
1
D
+
∆IIND
2
Peak Switch
Current
ISW(PK)
ILOAD
1
D
+
∆IIND
2
Switch Voltage
when Off
VSW(OFF)
VOUT + VF
Diode Reverse
Voltage
VR
VOUT - VSAT
Avg. Diode
Current
ID(AVG)
ILOAD
Peak Diode
Current
ID(PK)
ILOAD
1
D
+
∆IIND
2
.
Power
Dissipation
PD
0.25
Ω 
ILOAD
1
−D
2
D
+
ILOAD
• D • VIN
50
(1−D)
VF = Forward Biased Diode Voltage, ILOAD = Output Load
Figure 2. Step-up Regulator Waveforms
First, determine if the UC2577 can provide these values
of VOUT and ILOADmax when operating with the minimum
value of VIN. The upper limits for VOUT and ILOADmax are
given by the following equations.
VOUT
≤ 60V and
VOUT
≤ 10 • VINmin
ILOADmax
2.1A
• VINmin
VOUT
These limits must be greater than or equal to the values
specified in this application.
1. Output Voltage Section
Resistors R1 and R2 are used to select the desired out-
put voltage. These resistors form a voltage divider and
present a portion of the output voltage to the error ampli-
fier which compares it to an internal 1.23V reference. Se-
lect R1 and R2 such that:
R1
R2
=
VOUT
1.23V
− 1
Figure 3. Step-up Regulator Formulas
APPLICATIONS INFORMATION
4


Аналогичный номер детали - UC2577T-ADJG3

производительномер деталидатащиподробное описание детали
logo
Texas Instruments
UC2577T-ADJ TI-UC2577T-ADJ Datasheet
179Kb / 8P
[Old version datasheet]   Simple Step-Up Voltage Regulator
More results

Аналогичное описание - UC2577T-ADJG3

производительномер деталидатащиподробное описание детали
logo
Texas Instruments
UC2577 TI-UC2577 Datasheet
179Kb / 8P
[Old version datasheet]   Simple Step-Up Voltage Regulator
logo
National Semiconductor ...
LM1577 NSC-LM1577_05 Datasheet
1Mb / 31P
   SIMPLE SWITCHER짰 Step-Up Voltage Regulator
LM1577 NSC-LM1577 Datasheet
889Kb / 27P
   SIMPLE SWITCHER Step-Up Voltage Regulator
logo
Texas Instruments
LM2577SX-ADJNOPB TI1-LM2577SX-ADJNOPB Datasheet
4Mb / 42P
[Old version datasheet]   SIMPLE SWITCHER짰 Step-Up Voltage Regulator
logo
National Semiconductor ...
LM15777 NSC-LM15777 Datasheet
862Kb / 27P
   SIMPLE SWITCHER-R Step-Up Voltage Regulator
logo
Texas Instruments
LM1577 TI-LM1577_15 Datasheet
4Mb / 42P
[Old version datasheet]   LM1577/LM2577 SIMPLE SWITCHER짰 Step-Up Voltage Regulator
LMR64010 TI1-LMR64010_14 Datasheet
1Mb / 21P
[Old version datasheet]   SIMPLE SWITCHER짰 40Vout, 1A Step-Up Voltage Regulator in SOT-23
LMR61428 TI1-LMR61428 Datasheet
973Kb / 16P
[Old version datasheet]   LMR61428 SIMPLE SWITCHER짰 14Vout, 2.85A Step-Up Voltage Regulator in MSOP
LMR62421 TI-LMR62421_15 Datasheet
1Mb / 32P
[Old version datasheet]   SIMPLE SWITCHER 24Vout, 2.1A Step-Up Voltage Regulator in SOT-23
logo
National Semiconductor ...
LMR64010 NSC-LMR64010 Datasheet
376Kb / 12P
   SIMPLE SWITCHER짰 40Vout, 1A Step-Up Voltage Regulator in SOT-23
More results


Html Pages

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


датащи скачать

Go To PDF Page


ссылки URL




Конфиденциальность
ALLDATASHEETRU.COM
Вашему бизинису помогли Аллдатащит?  [ DONATE ] 

Что такое Аллдатащит   |   реклама   |   контакт   |   Конфиденциальность   |   обмен ссыками   |   поиск по производителю
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