データシートサーチシステム
  Japanese  ▼
ALLDATASHEET.JP

X  

LC5202D データシート(PDF) 11 Page - Sanken electric

部品番号 LC5202D
部品情報  Off-Line LED Driver ICs
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
メーカー  SANKEN [Sanken electric]
ホームページ  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

LC5202D データシート(HTML) 11 Page - Sanken electric

Back Button LC5202D Datasheet HTML 7Page - Sanken electric LC5202D Datasheet HTML 8Page - Sanken electric LC5202D Datasheet HTML 9Page - Sanken electric LC5202D Datasheet HTML 10Page - Sanken electric LC5202D Datasheet HTML 11Page - Sanken electric LC5202D Datasheet HTML 12Page - Sanken electric LC5202D Datasheet HTML 13Page - Sanken electric LC5202D Datasheet HTML 14Page - Sanken electric LC5202D Datasheet HTML 15Page - Sanken electric Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 16 page
background image
11
SANKEN ELECTRIC CO., LTD.
LC5200-DS, Rev. 6.0
Off-Line LED Driver ICs
LC5200 Series
Comp2 compares VSEN and VREF, and when VREF < VSEN,
Comp2 inverts its output (see point A in figure 4). This resets the
output Q of the RS flip-flop. After a turn-off signal is transmitted
from the AND gate to the logic, to the gate driver, and finally to
the internal power MOSFET, the power MOSFET turns off. At
the same time, an internal MOS switch, connected to the PWM
pin, turns on, and CPWM is discharged.
After a certain period, when the PWM pin voltage, VPWM ,
decreases to less than 2 V, the comparator for the off-time,
Comp1, inverts and the Q output of the RS flip-flop is set. Then
the MOS switch for discharging CPWM turns off, and CPWM
is charged by the REF pin voltage through RPWM (connected
between the REF and PWM pins).
When VPWM increases to more than 3 V, the fixed off-time
expires and the power MOSFET turns on. After that, the opera-
tion reverts to the initial state, shown as point B in figure 4.
VSEN is detected in the on-time period, except during the PWM
blanking time, tBLK , in order to prevent malfunction.
The fixed off-time is determined by RPWM and CPWM. Figure 5
shows PWM off-time curves based on various values of RPWM
and CPWM . The recommended value for RPWM is 560 kΩ, and that
for CPWM is 220 pF. In addition, the proper values for RPWM and
CPWM are changeable according the load conditions of the LEDs
used, and the value of RPWM also affects the losses in the internal
regulator directly. It is necessary to pay attention to these factors.
Current Value Setting for Dimming Control
The LC5200 series allows constant current control using the
internal PWM control, an external PWM signal, or a combination
of both of them.
Using Internal PWM Dimming
The LC5200 series has a built-in PWM constant current control
circuit, and thus can achieve a constant current drive system for
the LED string, while requiring few external components. The
peak output current, IPEAK , for driving the LED string is calcu-
lated as follows:
VREF
RS
IPEAK =
VREG × R2
RS × ( R1 + R2 )
=
(1)
The LC5200 series allows external adjustment of the current
flowing through the LED string, using either of the following
methods:
• Adjusting the analog voltage on the REF pin (figure 6A)
• Inputting the analog voltage integrated PWM signal through a
low pass filter, LPF, to the REF pin (figure 6B)
However, the dimming control by adjusting the REF pin voltage
can not set the output current to zero. When controlling to zero
current, an external signal and external circuit are needed to set
the PWM pin voltage to low.
R1
R2
CPWM
RS
C2
C1
RPWM
SEN
GND
REG
PWM
REF
SEN
GND
REG
PWM
REF
CPWM
RS
CLPF
LC5200
RPWM
PWM
Signal
LPF
RLPF
LC5200
50
200
R
PWM Value for Setting Off-Time (Ω)
400
600
800
1000
20
10
5
2
1
C
PWM
= 470 pF
C
PWM
= 220 pF
C
PWM
= 100 pF
C
PWM
= 47 pF
C
PWM
= 22 pF
C
PWM
= 10 pF
Figure 5. PWM Off-Time versus RPWM Value, for Various Values of CPWM
Figure 6. Dimming Application Circuits with Internal PWM Control
(A) Analog Control
(B) Integrated PWM Control


同様の部品番号 - LC5202D

メーカー部品番号データシート部品情報
logo
Sanken electric
LC5202D SANKEN-LC5202D Datasheet
436Kb / 16P
   Hybrid Integrated Circuit
More results

同様の説明 - LC5202D

メーカー部品番号データシート部品情報
logo
Sanken electric
LC5222D SANKEN-LC5222D Datasheet
271Kb / 11P
   Off-Line DC / DC LED Driver ICs
LC5223D SANKEN-LC5223D Datasheet
260Kb / 10P
   Off-Line DC / DC LED Driver ICs
logo
Monolithic Power System...
MP4651 MPS-MP4651 Datasheet
277Kb / 12P
   Off Line LED Driver
logo
IXYS Corporation
MXHV9910 IXYS-MXHV9910 Datasheet
348Kb / 12P
   Off-Line, High Brightness LED Driver
logo
Supertex, Inc
HV9921DB1 SUTEX-HV9921DB1 Datasheet
343Kb / 2P
   Universal Off-line LED Driver Demoboard
logo
Clare, Inc.
MXHV9910 CLARE-MXHV9910 Datasheet
604Kb / 11P
   Off-Line, High Brightness LED Driver
logo
Sanken electric
LC5200 SANKEN-LC5200_12 Datasheet
93Kb / 2P
   LED Driver ICs
STR-A607XM SANKEN-STR-A607XM Datasheet
278Kb / 13P
   PWM Off-Line Switching Regulator ICs
STR-A606XHD SANKEN-STR-A606XHD Datasheet
279Kb / 13P
   PWM Off-Line Switching Regulator ICs
logo
Allegro MicroSystems
STR3A151D ALLEGRO-STR3A151D Datasheet
265Kb / 14P
   PWM Off-Line Switching Regulator ICs
More results


Html Pages

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


データシート ダウンロード

Go To PDF Page


リンク URL




プライバシーポリシー
ALLDATASHEET.JP
ALLDATASHEETはお客様のビジネスに役立ちますか?  [ DONATE ] 

Alldatasheetは   |   広告   |   お問い合わせ   |   プライバシーポリシー   |   リンク交換   |   メーカーリスト
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