전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

FAN5308 데이터시트(PDF) 8 Page - Fairchild Semiconductor

부품명 FAN5308
상세설명  800mA High-Efficiency Step-Down DC-DC Converter
Download  11 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5308 데이터시트(HTML) 8 Page - Fairchild Semiconductor

Back Button FAN5308_07 Datasheet HTML 3Page - Fairchild Semiconductor FAN5308_07 Datasheet HTML 4Page - Fairchild Semiconductor FAN5308_07 Datasheet HTML 5Page - Fairchild Semiconductor FAN5308_07 Datasheet HTML 6Page - Fairchild Semiconductor FAN5308_07 Datasheet HTML 7Page - Fairchild Semiconductor FAN5308_07 Datasheet HTML 8Page - Fairchild Semiconductor FAN5308_07 Datasheet HTML 9Page - Fairchild Semiconductor FAN5308_07 Datasheet HTML 10Page - Fairchild Semiconductor FAN5308_07 Datasheet HTML 11Page - Fairchild Semiconductor  
Zoom Inzoom in Zoom Outzoom out
 8 / 11 page
background image
©2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5308 Rev. 1.0.2
8
The N-channel transistor is turned off before the inductor
current becomes negative. At this time, the P-channel is
switched on again, starting the next pulse. The converter
continues these pulses until the high threshold (typical
1.6% above nominal value) is reached. A higher output
voltage in PFM mode gives additional headroom for the
voltage drop during a load transient from light to full load.
The voltage overshoot during this load transient is also
minimized due to active regulation during turn on of the
N-channel rectifier switch. The device stays in sleep
mode until the output voltage falls below the low thresh-
old. The FAN5308 enters the PWM mode as soon as the
output voltage can no longer be regulated in PFM with
constant peak current.
100% Duty Cycle Operation
As the input voltage approaches the output voltage and
the duty cycle exceeds the typical 95%, the converter
turns the P-channel transistor continuously on. In this
mode, the output voltage is equal to the input voltage,
minus the voltage drop across the P-channel transistor:
where:
RdsON = P-channel switch on resistance
ILOAD = Output current
RL = Inductor DC resistance
UVLO and Soft Start
The reference and the circuit remain reset until the VIN
crosses its UVLO threshold.
The FAN5308 has an internal soft-start circuit that limits
the inrush current during start-up. This prevents possible
voltage drops of the input voltage and eliminates the out-
put voltage overshoot. The soft-start is implemented as a
digital circuit, increasing the switch current in four steps
to the P-channel current limit (1500mA). Typical start-up
time for a 20µF output capacitor and a load current of
800mA is 800µs.
Short-Circuit Protection
The switch peak current is limited cycle-by-cycle to a typ-
ical value of 1500mA. In the event of an output voltage
short circuit, the device operates with a frequency of
400kHz and minimum duty cycle; therefore, the average
input current is typically 200mA.
Thermal Shutdown
When the die temperature exceeds 150°C, a reset
occurs and remains in effect until the die cools to 130°C.
At that time, the circuit is allowed to restart.
VOUT = VIN – ILOAD × (RdsON + RL)
EQ. 2


유사한 부품 번호 - FAN5308_07

제조업체부품명데이터시트상세설명
logo
Fairchild Semiconductor
FAN5308MPX FAIRCHILD-FAN5308MPX Datasheet
409Kb / 11P
   800mA High-Efficiency Step-Down DC-DC Converter
More results

유사한 설명 - FAN5308_07

제조업체부품명데이터시트상세설명
logo
Fairchild Semiconductor
FAN5308 FAIRCHILD-FAN5308 Datasheet
409Kb / 11P
   800mA High-Efficiency Step-Down DC-DC Converter
logo
Unisonic Technologies
UC3666 UTC-UC3666 Datasheet
190Kb / 8P
   DUAL CHANNEL 800mA HIGH EFFICIENCY STEP-DOWN DC/DC CONVERTER
logo
Richtek Technology Corp...
RT8010B RICHTEK-RT8010B Datasheet
255Kb / 12P
   1.5MHz, 800mA, High Efficiency PWM Step-Down DC/DC Converter
logo
BCD Semiconductor Manuf...
AUR9703 BCDSEMI-AUR9703 Datasheet
892Kb / 20P
   1.5MHz, 800mA, STEP DOWN DC-DC CONVERTER
logo
ELM Technology Corporat...
ELM600LA ELM-TECH-ELM600LA Datasheet
2Mb / 10P
   ELM600LA 800mA 1.4MHz high efficiency synchronous PWM step down DC/DC converter
logo
Semtech Corporation
SC1578 SEMTECH-SC1578 Datasheet
130Kb / 5P
   HIGH-EFFICIENCY STEP-DOWN DC-DC CONVERTER
logo
Fairchild Semiconductor
FAN5307 FAIRCHILD-FAN5307 Datasheet
623Kb / 13P
   High-Efficiency Step-Down DC-DC Converter
logo
Analog Intergrations Co...
AIC1578 AIC-AIC1578 Datasheet
266Kb / 7P
   High-Efficiency, Step-Down DC/DC Converter
logo
Shindengen Electric Mfg...
MD1422N SHINDENGEN-MD1422N Datasheet
41Kb / 2P
   high-efficiency step down DC-DC converter
logo
Texas Instruments
TPS62205 TI-TPS62205 Datasheet
264Kb / 19P
[Old version datasheet]   HIGH-EFFICIENCY, SOT23 STEP-DOWN, DC-DC CONVERTER
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11


데이터시트 다운로드

Go To PDF Page


링크 URL




개인정보취급방침
ALLDATASHEET.CO.KR
ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크교환   |   제조사별 검색
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