Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

EL7630 Datasheet(PDF) 5 Page - Intersil Corporation

Part # EL7630
Description  White LED Boost Regulator
Download  7 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

EL7630 Datasheet(HTML) 5 Page - Intersil Corporation

  EL7630 Datasheet HTML 1Page - Intersil Corporation EL7630 Datasheet HTML 2Page - Intersil Corporation EL7630 Datasheet HTML 3Page - Intersil Corporation EL7630 Datasheet HTML 4Page - Intersil Corporation EL7630 Datasheet HTML 5Page - Intersil Corporation EL7630 Datasheet HTML 6Page - Intersil Corporation EL7630 Datasheet HTML 7Page - Intersil Corporation  
Zoom Inzoom in Zoom Outzoom out
 5 / 7 page
background image
5
FN7371.1
February 22, 2006
Detailed Description
EL7630 uses a constant frequency, current mode control
scheme to provide excellent line and load regulation. It
can drive up to 6 LEDs in series or 15 LEDs in
parallel/series configuration, with efficiencies of up 86%.
EL7630 operates from an input voltage of 2.7V to 5.5V and
can boost up to 27V.
Steady-State Operation
EL7630 operates with constant frequency PWM. The
switching frequency is around 1.2MHz. Depending on the
input voltage, inductance, number of LEDs and the LED
current, the converter operates in either continuous
conduction mode or discontinuous conduction mode. Both
are normal. The forward current of the LED is set using the
RSET resistor. In steady state mode, this current is given by
the equation:
Shut-Down
The ENAB pin, when taken low places EL7630 into power
down mode. When in power down, the supply current
reduced to less than 1µA.
Dimming Control
The ENAB pin also doubles as a brightness control. There
are two different types of dimming control methods. The first
dimming control is controlled through the duty-cycle of the
ENAB input PWM waveform, which can operate at
frequencies of 400Hz to 1kHz. The LEDs operate at either
zero or full current. This is called PWM dimming control
method. The relationship between the average LED current
and the duty-cycle (D) of the ENAB pin’s waveform is as
follows:
The magnitude of the PWM signal should be higher than the
minimum ENAB voltage high. The bench PWM dimming test
results are shown in Figure 8. In the test, two PWM
frequencies 400Hz and 1kHz are chosen to compare the
linear dimming range. It is clear that for lower PWM
frequency, the linear dimming range is wider than one for
higher PWM frequency. In the PWM dimming test, the output
capacitor is 0.22µF.
The second dimming control is to apply a variable DC
voltage to adjust the LED current. This is called analog
dimming control. The dimming control using a DC voltage is
shown in Figure 9. As the DC dimming signal voltage
increases, the voltages drop on R1 and R2 increases and
the voltage drop on RSET decreases. Thus, the LED current
decreases. The DC dimming signal voltage can be a variable
DC voltage or a DC voltage generated from a PWM control
signal. For some application areas, the PWM control signal
is a high frequency signal. To make dimming controllable
with these high frequency PWM signals, the high frequency
components of the PWM control signal should be filtered to
get the equivalent DC voltage. The equivalent DC voltage is
then used as the variable DC voltage for dimming LED
current.
where F is the brightness with respect to the undimmed
value.
ILED
VFB
RSET
---------------
=
(EQ. 1)
average ILED
VFB
RSET
--------------- D
=
(EQ. 2)
0
5
10
15
20
25
0 102030 4050 60 708090 10
DUTY-CYCLE (%)
FIGURE 8. PWM DIMMING LINEAR RANGE (FOR 400Hz AND
1kHz PWM FREQUENCIES CONDITION,
COUT = 0.22µF)
1kHz
400Hz
ILED
VFB
RSET
---------------
R1 R2
+
R2
---------------------
VDim R1
RSET R2
---------------------------
=
(EQ. 3)
VDim
R2
R1
------- VFB 1
R1
R2
------- F
+



⋅⋅
=
(EQ. 4)
EL7630


Similar Part No. - EL7630

ManufacturerPart #DatasheetDescription
logo
Intersil Corporation
EL7630 INTERSIL-EL7630 Datasheet
223Kb / 7P
   White LED Boost Regulator
logo
Renesas Technology Corp
EL7630 RENESAS-EL7630 Datasheet
388Kb / 7P
   White LED Boost Regulator
logo
Intersil Corporation
EL7630ICZ INTERSIL-EL7630ICZ Datasheet
223Kb / 7P
   White LED Boost Regulator
EL7630ICZ-T7 INTERSIL-EL7630ICZ-T7 Datasheet
223Kb / 7P
   White LED Boost Regulator
logo
Renesas Technology Corp
EL7630ICZ-T7 RENESAS-EL7630ICZ-T7 Datasheet
388Kb / 7P
   White LED Boost Regulator
More results

Similar Description - EL7630

ManufacturerPart #DatasheetDescription
logo
Intersil Corporation
EL7630 INTERSIL-EL7630 Datasheet
223Kb / 7P
   White LED Boost Regulator
logo
Renesas Technology Corp
EL7630 RENESAS-EL7630 Datasheet
388Kb / 7P
   White LED Boost Regulator
logo
Alpha & Omega Semicondu...
AOZ1950 AOSMD-AOZ1950 Datasheet
1Mb / 14P
   Boost Regulator White LED Driver
logo
Micrel Semiconductor
MIC2297 MICREL-MIC2297 Datasheet
272Kb / 12P
   40V PWM Boost Regulator White LED Driver
MIC2297 MICREL-MIC2297_08 Datasheet
281Kb / 11P
   40V PWM Boost Regulator White LED Driver
logo
Renesas Technology Corp
ISL97631 RENESAS-ISL97631 Datasheet
471Kb / 8P
   White LED Boost Regulator With Integrated Schottky Diode
logo
Intersil Corporation
ISL97631 INTERSIL-ISL97631 Datasheet
331Kb / 8P
   White LED Boost Regulator With Integrated Schottky Diode
logo
Sipex Corporation
SP6691 SIPEX-SP6691_07 Datasheet
698Kb / 15P
   SOT23Micro Power Boost Regulator Series White LED Driver
SP6690 SIPEX-SP6690 Datasheet
270Kb / 16P
   Micro Power Boost Regulator Series White LED Driver
SP6691 SIPEX-SP6691 Datasheet
253Kb / 15P
   Micro Power Boost Regulator Series White LED Driver
More results


Html Pages

1 2 3 4 5 6 7


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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