поискавой системы для электроныых деталей
  Russian  ▼
ALLDATASHEETRU.COM

X  

UC3578 датащи(PDF) 4 Page - Texas Instruments

Click here to check the latest version.
номер детали UC3578
подробное описание детали  Buck Pulse Width Modulator Stepdown Voltage Regulator
Download  7 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

UC3578 датащи(HTML) 4 Page - Texas Instruments

  UC3578 Datasheet HTML 1Page - Texas Instruments UC3578 Datasheet HTML 2Page - Texas Instruments UC3578 Datasheet HTML 3Page - Texas Instruments UC3578 Datasheet HTML 4Page - Texas Instruments UC3578 Datasheet HTML 5Page - Texas Instruments UC3578 Datasheet HTML 6Page - Texas Instruments UC3578 Datasheet HTML 7Page - Texas Instruments  
Zoom Inzoom in Zoom Outzoom out
 4 / 7 page
background image
4
UC2578
UC3578
Current Limit
The current sense pin provides overcurrent shutdown.
As can be seen from the block diagram, the overcurrent
comparator is wire ANDed with the oscillator after an in-
ternally set blanking time. The ILIMIT threshold level is set
by the current sense resistor from RSENSE.
I
V
R
LIMIT
SENSE
=
05
.
An optional filter can be added (RSCS) from the current
sense resistor to CS to provide high frequency filtering of
the current sense signal if necessary.
During a current limit condition, the soft start capacitor on
SS is discharged until its voltage level reaches 1.2V. Dur-
ing this time, a duty cycle clamp is activated to approxi-
mately 0.6V above the voltage level on the SS capacitor.
This condition persist until the SS capacitor is discharged
to 1.2V, thus disabling the output driver. At this time, the
SS capacitor is allowed to charge to 5V through the 50
µA
current source and normal operation resumes when the
SS capacitor reaches 5V. During the condition described,
the regulator enters a hiccup current limit mode of opera-
tion which limits the power dissipation in the MOSFET
and output rectifier under a short circuit condition.
Error Amplifier
The onboard error amplifier of the UC3578 is a voltage
amplifier with its non-inverting input tied to an internal 2V
reference. As usual, loop compensation can be added
from the inverting input of EAINV to the error amplifier
output at EAOUT. Consideration must be given when
choosing the values of the compensation components
around the amplifier so that the output swing of the am-
plifier is not restricted. The output of the amplifier can
source 100
µA typically.
General
As in any buck converter, when the switch is off, the
source
flies
low
due
to
the
conduction
of
the
free-wheeling rectifier. The source (SRC) is pulled below
ground by an amount determined by the forward voltage
drop of the rectifier and by any transient voltage spike
from inductance in this path. The occurrence of this con-
dition could result in erratic operation of the IC during this
period if the negative excursion is not limited. This is be-
cause of conduction of current in the substrate of the IC
due to the source pin being pulled below ground and for-
ward biasing the internal substrate PN junction. To limit
this effect, a small resistor (15
Ω) can be placed in series
between the MOSFET source and the SRC pin as shown
in Fig. 1. Too large a resistor will limit the drive to the
Figure 1. Block diagram.
APPLICATION INFORMATION (cont.)
UDG-97006


Аналогичный номер детали - UC3578

производительномер деталидатащиподробное описание детали
logo
Texas Instruments
UC3578 TI1-UC3578 Datasheet
904Kb / 11P
[Old version datasheet]   Buck Pulse Width Modulator Stepdown Voltage Regulator
UC3578DP TI1-UC3578DP Datasheet
904Kb / 11P
[Old version datasheet]   Buck Pulse Width Modulator Stepdown Voltage Regulator
UC3578DPG4 TI1-UC3578DPG4 Datasheet
904Kb / 11P
[Old version datasheet]   Buck Pulse Width Modulator Stepdown Voltage Regulator
More results

Аналогичное описание - UC3578

производительномер деталидатащиподробное описание детали
logo
Texas Instruments
UC2578 TI1-UC2578_16 Datasheet
904Kb / 11P
[Old version datasheet]   Buck Pulse Width Modulator Stepdown Voltage Regulator
UC1573 TI-UC1573 Datasheet
136Kb / 5P
[Old version datasheet]   Buck Pulse Width Modulator Stepdown Voltage Regulator
UC2573D TI1-UC2573D Datasheet
1Mb / 12P
[Old version datasheet]   Buck Pulse Width Modulator Stepdown Voltage Refgulator
logo
Renesas Technology Corp
HIP6007 RENESAS-HIP6007 Datasheet
554Kb / 10P
   Buck Pulse-Width Modulator (PWM) Controller
logo
Intersil Corporation
HIP6007 INTERSIL-HIP6007 Datasheet
100Kb / 10P
   Buck Pulse-Width Modulator (PWM) Controller
HIP6013 INTERSIL-HIP6013_05 Datasheet
297Kb / 11P
   Buck Pulse-Width Modulator (PWM) Controller
logo
Renesas Technology Corp
HIP6013 RENESAS-HIP6013 Datasheet
601Kb / 11P
   Buck Pulse-Width Modulator (PWM) Controller
logo
Intersil Corporation
HIP6013 INTERSIL-HIP6013 Datasheet
103Kb / 11P
   Buck Pulse-Width Modulator (PWM) Controller
logo
Linear Technology
LTC6992-2 LINER-LTC6992-2_15 Datasheet
533Kb / 34P
   Voltage-Controlled Pulse Width Modulator
LTC6992-4 LINER-LTC6992-4_15 Datasheet
533Kb / 34P
   Voltage-Controlled Pulse Width Modulator
More results


Html Pages

1 2 3 4 5 6 7


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