数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

LT1943 数据表(PDF) 10 Page - Linear Technology

部件名 LT1943
功能描述  High Current Quad Output Regulator for TFT LCD Panels
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1943 数据表(HTML) 10 Page - Linear Technology

Back Button LT1943 Datasheet HTML 6Page - Linear Technology LT1943 Datasheet HTML 7Page - Linear Technology LT1943 Datasheet HTML 8Page - Linear Technology LT1943 Datasheet HTML 9Page - Linear Technology LT1943 Datasheet HTML 10Page - Linear Technology LT1943 Datasheet HTML 11Page - Linear Technology LT1943 Datasheet HTML 12Page - Linear Technology LT1943 Datasheet HTML 13Page - Linear Technology LT1943 Datasheet HTML 14Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 20 page
background image
LT1943
10
1943fa
OPERATIO
Figure 2. LT1943 Power-Up Sequence. (Traces From
Both Photos are Synchronized to the Same Trigger)
RUN-SS
2V/DIV
VLOGIC
5V/DIV
IL1
1A/DIV
IL2+L3
1A/DIV
SS-234
2V/DIV
AVDD
20V/DIV
PGOOD
20V/DIV
5ms/DIV
1943 F03a
VOFF
10V/DIV
VCT
2V/DIV
IL4
500mA/DIV
IL5
500mA/DIV
VE3
20V/DIV
VON
50V/DIV
5ms/DIV
1943 F03b
(2a)
(2b)
The LT1943 is a highly integrated power supply IC con-
taining four separate switching regulators. All four switch-
ing regulators have their own oscillator with frequency
foldback and use current mode control. Switching regula-
tor 1 consists of a step-down regulator with a switch
current limit of 2.4A. Switching regulator 2 can be config-
ured as a step-up or SEPIC converter and has a 2.6A
switch. Switching regulator 3 consists of a step-up regu-
lator with a 0.35A switch as well as an integrated Schottky
diode. Switching regulator 4 has two feedback pins (FB4
and NFB4) and can directly regulate positive or negative
output voltages. The four regulators share common cir-
cuitry including input source, voltage reference, and mas-
ter oscillator. Operation can be best understood by refer-
ring to the Block Diagram as shown in Figure 1.
If the RUN/SS pin is pulled to ground, the LT1943 is shut
down and draws 35
µAfromtheinputsourcetiedtoVIN.An
internal 1.7
µA current source charges the external soft-
start capacitor, generating a voltage ramp at this pin. If the
RUN/SS pin exceeds 0.6V, the internal bias circuits turn
on, including the internal regulator, reference, and 1.1MHz
master oscillator. The master oscillator generates four
clock signals, one for each of the switching regulators.
Switching regulator 1 will only begin to operate when the
RUN/SS pin reaches 0.8V. Switcher 1 generates VLOGIC,
which must be tied to the BIAS pin. When BIAS reaches
2.8V, the NPN pulling down on the SS-234 pin turns off,
allowing an internal 1.7
µA current source to charge the
external capacitor tied to the SS-234 pin. When the voltage
on the SS-234 pin reaches 0.8V, switchers 2, 3 and 4 are
enabled. AVDD and VOFF will then begin rising at a ramp
rate determined by the capacitor tied to the SS-234 pin.
When all the outputs reach 90% of their programmed
voltages, the NPN pulling down on the CT pin will turn off,
and an internal 20
µA current source will charge the exter-
nal capacitor tied to the CT pin. When the CT pin reaches
1.1V, the output disconnect PNP turns on, connecting
VON. In the event of any of the four outputs dropping below
10% of their programmed voltage, PanelProtect circuitry
pulls the CT pin to GND, disabling VON.
A power good comparator monitors AVDD and turns on
when the FB2 pin is at or above 90% of its regulated value.
The output is an open collector transistor that is off when
the output is out of regulation, allowing an external resis-
tor to pull the pin high. This pin can be used with a
P-channel MOSFET that functions as an output disconnect
for AVDD.
The four switchers are current mode regulators. Instead of
directly modulating the duty cycle of the power switch, the
feedback loop controls the peak current in the switch
during each cycle. Compared to voltage mode control,
current mode control improves loop dynamics and pro-
vides cycle-by-cycle current limit.


类似零件编号 - LT1943

制造商部件名数据表功能描述
logo
Linear Technology
LT1943 LINER-LT1943 Datasheet
279Kb / 12P
   High Current Quad Output Regulator for TFT LCD Panels
LT1943 LINER-LT1943 Datasheet
277Kb / 20P
   High Current Quad Output Regulator for TFT LCD Panels
LT1943EFE LINER-LT1943EFE Datasheet
279Kb / 12P
   High Current Quad Output Regulator for TFT LCD Panels
LT1943 LINER-LT1943_15 Datasheet
277Kb / 20P
   High Current Quad Output Regulator for TFT LCD Panels
More results

类似说明 - LT1943

制造商部件名数据表功能描述
logo
Linear Technology
LT1943 LINER-LT1943 Datasheet
279Kb / 12P
   High Current Quad Output Regulator for TFT LCD Panels
LT1943 LINER-LT1943_15 Datasheet
277Kb / 20P
   High Current Quad Output Regulator for TFT LCD Panels
LT3513 LINER-LT3513_15 Datasheet
384Kb / 22P
   2MHz High Current 5-Output Regulator for TFT-LCD Panels
LT3513 LINER-LT3513 Datasheet
261Kb / 20P
   2MHz High Current 5-Output Regulator for TFT-LCD Panels
logo
National Semiconductor ...
LM6584 NSC-LM6584 Datasheet
976Kb / 16P
   TFT-LCD Quad, 13V RRIO High Output Current
logo
Toshiba Semiconductor
JBT6L77-AS TOSHIBA-JBT6L77-AS Datasheet
222Kb / 20P
   Source Driver for TFT LCD Panels
logo
Richtek Technology Corp...
RT6908 RICHTEK-RT6908 Datasheet
429Kb / 22P
   PMIC for TFT LCD TV Panels
logo
Toshiba Semiconductor
JBT6K47-AS TOSHIBA-JBT6K47-AS Datasheet
231Kb / 22P
   Source Driver for TFT LCD Panels
T6LD4 TOSHIBA-T6LD4 Datasheet
142Kb / 11P
   Gate Driver for TFT LCD Panels
T6LE2 TOSHIBA-T6LE2 Datasheet
198Kb / 12P
   Gate Driver for TFT LCD Panels
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
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