Abstract This application note describes multi-functional system,

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AND8192/D Charge Pump Based Multiple Driver
Abstract
This application note describes multi-functional system, capable generating controlling power needed utilized three features available modern cellular phones. addition larger displays, with full color capability, flash torch features have been added support embedded camera night path finder. These features made possible using ultra bright powered standard battery cells.
BASIC CIRCUIT DESCRIPTION
Since have forward drop voltage ranging from depending upon forward current, straightforward connection standard battery feasible depicted Figure boost structure must used make power supply voltage compatible with LED.
other hand, combining three functions same system creates special case since converter must capable driving wide current load needed different functions. typical currents used drive LED, summarized Table range from when flash activated. Moreover, unlike xenon photo flash, system must have relatively long pulse light properly illuminate scene. Typically, xenon pulse flash duration, system being range. Consequently, converter must designed support such large demand. High powered capable sustaining under development drivers these devices should available within months.
Battery Voltage F(Capacity) +20°C
NICHIA-NECWB205 mA-4.0 OSRAM LWY87S mA-3.8 CITIZEN- CL590S mA-3.9
Absorbed Capacity MB-JUNE 2004 1.33 Vout
OSRAM LWT67C mA-4.1
Vout-3 Cell Alkaline Vout-Li-ion Vout-2 cell Alkaline
Figure Typical Lithium-Ion Battery Voltage White
Semiconductor Components Industries, LLC, 2004
December, 2004 Rev.
Publication Order Number: AND8192/D
AND8192/D
Table White Typical Applications
OSRAM LWY85S OSRAM LWT67C OSRAM OSRAM LWW5SG CITIZEN CL590S NICHIA-NECWB205 LUMILED Backlight Torch Flash
Along with amount current converter provides, worthwhile note thermal behavior both silicon power LED. According OSRAM's data sheet, Dragon (LWW5SG should have maximum forward drop with current. power absorbed load will 1.57 and, assuming efficiency DC/DC converter, will translate almost input power. Consequently, some will dissipated heat into silicon and, according NCP5603 data sheet, chip temperature will increase RqJA 34°DC. Such temperature increase acceptable since, even under worst case +85°C ambient temperature, junction will below maximum rating defined this chip. However, must take into account battery situation: this case, efficiency converter decrease with efficiency, yielding almost 54°DC temperature increases. this point, silicon rise above 125°C, under extreme high ambient temperature, global long-term reliability chip will impaired. This avoided either reducing thermal resistance (using heatsink means layer) ensuring duty cycle short enough properly cool chip between pulses. Generally speaking, High Intensity power limited care must observed avoid thermal during normal operation. This particularly true flash mode which, depicted above, nearly dissipated into junctions. Because junction ambient thermal resistance limited packaging
LED, good thermal contact dedicated layer printed board essential. LWW5SG specifications give maximum 9°C/W junction-to-case thermal resistance, capable limiting temperature silicon 100°C maximum specified OSRAM data sheet. After dissipating maximum thermal resistance acceptable chip calculated
RqJA RqJA Tjmax Tamb Pchip
9.37°C
Since RqJC 9°C/W, practically impossible achieve 0.38°C/W case ambient thermal resistance only alternative limit operating ambient temperature. Assuming Tamb 60°C, then RqJA (100-60) 25°C/W. this case, case-to-ambient thermal resistance 16°C/W, value more realistic, although easy achieve with room limited PCB. NCP5603 operates without special treatment terms thermal sinking simple copper flag built underneath package depicted Figure schematic multiple application, Figure illustrates three functions: four parallel, dimming capability. Torch LED, output adjustment. Flash power LED, pulse width adjustable.
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AND8192/D
mF/10 LWG6SC
MGSF1N03L MGSF1N03L
GOLDEN DRAGON 5.1R LW67C LW67C LW67C LW67C
Vout
MMBF0201N
Vout
NCP5603 EN/PWM Fsel Vsel
mF/6.3
74HC08
200R
74HC08 NL37WZ04 TORCH
Vbat
mF/6.3 FSEL VSEL
MC74HC4538
74HC08
MC14538B
mF/10
Adjust FLASH
nF/6.3 VSEL FSEL
NL37WZ04
Adjust
CNT/PWM
NL37WZ04
Figure Multiple Driver Application http://onsemi.com
FLASH
AND8192/D
Layer
BOTTOM Layer
Figure Printer Circuit Board GERBER Files (scale 1:1) http://onsemi.com
AND8192/D
system powered cells series, assembled standard battery holder, operating mode being selected switches. Since total current limited DC/DC converter, backlights LEDs automatically deactivated when either Torch Flash selected. Moreover, Flash available while Torch running. extra feature, backlight dimming, provided switch associated with potentiometer When switch connected ground, NCP5603 enabling high brightness maximized. When
Table Demo Board Efficiency
Vbat 3.50 3.50 3.50 3.10 3.10 3.10 Ibat Vout 4.42 4.92 4.42 4.92 4.92 Iout/LED 16.5 21.4 16.5 21.4 Iout Total 85.6 85.6 Yield 63.14% 70.78% 71.83% 80.38% 75.12% Torch operation Comments Load
switch flipped position, RESET released clocked High clock generated U2B. Simultaneously, diode turns identify mode operation. duty cycle output manually adjusted potentiometer brightness four associated LED. efficiency system been evaluated room temperature (see Table results being fully within NCP5603 data sheet specifications.
inrush current internally limited chip, depicted Figure uncontrolled current takes place when system starts from scratch.
Figure Typical Digital Dimming
Figure Typical Startup Timing
With startup time well below (from zero full Vout, Figure NCP5603 fast enough accommodate flash application shown demo board.
Although there dedicated pin, brightness dimmed means digital control. waveform captured Figure illustrate this behavior, being intentionally arranged audio band portable system.
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AND8192/D
NCP5603 MULTIPLE DRIVE CIRCUIT Bill Material
Designator R10, R11, Description pack four independent elements Potentiometer Potentiometer mF/10 mF/6.3 mF/10 LW67C GOLDEN DRAGON LWG6SC MMBF0201N MGSF1N03L NCP5603 NL37WZ04 74HC08 MC14538B Toggle Switch Push Button Toggle Switch TEST POINT 1.5V Battery holder, Footprint SIP-5 0805 0805 0805 0805 0805 0805 0805 1206 1206 1206 0805 0805 0805 OSRAM_LED OSRAM_DRAGON OSRAM_LWG OSRAM_LED SOT_23A SOT_23A QFN10_COB SO-14 SO-16 APEM_CMS PUSH_BUT_B CKSWITCH_V TEST_POINT GND_TEST BPACK2 Manufacturer BOURNS Vishay Draloric Vishay Draloric Vishay Draloric Vishay Draloric Vishay Draloric Vishay Draloric Vishay Draloric BOURNS BOURNS KEMET KEMET OSRAM OSRAM OSRAM OSRAM Semiconductor Semiconductor Semiconductor Semiconductor Semiconductor Semiconductor APEM CANNON KEYSTONE HARWIN KEYSTONE TL36WS84000 0M210 ET01MD1 5005 (THM) D3082-01 (tin) D3082-05 (gold) 2223 LWW5SG 3386F-TW 3386F-TW Part Number 4605X series
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AND8192/D

Abstract This application note describes multi-functional system,

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