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FAN5610MPX 데이터시트(PDF) 8 Page - Fairchild Semiconductor

부품명 FAN5610MPX
상세설명  LED Driver for White, Blue or any Color LED
Download  10 Pages
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5610MPX 데이터시트(HTML) 8 Page - Fairchild Semiconductor

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FAN5610
PRODUCT SPECIFICATION
8
REV. 1.0.2 10/28/03
Application Examples:
Example 1: Drive low VF white or blue LEDs directly
from single cell Li-ion
When using white or blue low VF LEDs, and utilizing the
driver’s low voltage drop, only 3.45V in VIN is needed for
the full 20mA LED current. Usually at 3.1V, there is still
5mA current available for the LEDs. The single cell Li-ion is
utilized in most applications like cell phones or digital still
cameras. In most cases, the Li-ion battery voltage level only
goes down to 3.0V voltage level, and not down to the full
discharge level (2.7V) before requesting the charger.
–VDROP ~ 0.35V
–VF (at 20mA) < 3.1V (Low VF)
–VIN (at 20mA) =VDROP + VF = 3.45V
–VIN (at 5mA Typical) ~ 3.1V
Where VIN = Single cell Li-ion Voltage
Key advantages:
• No boost circuit needed for the LCD or keyboard
backlight
• Driver directly connected to a Li-ion battery
• No EMI, no switching noise, no boost efficiency lost, no
capacitor, and no inductor.
Example 2: Drive high VF white or blue LEDs from
existing bus from 4.0V to 5.5V
High VF white or blue LEDs have forward-voltage drop in
the range of 3.3V to 4.0V. To drive these LEDs with the max-
imum current of 20mA for maximum brightness, usually
requires a boost circuit for a single cell Li-ion voltage range.
In some cases, there is already a voltage bus in the system,
which can be utilized. Due to the low voltage drop of the
FAN5610, VIN needs to be only 350mV higher than the
voltage VF of LEDs connected to FAN5610.
–VDROP ~ 0.35V
–VF (at 20mA) = 3.3V to 4.0V (High VF)
–VIN(at 20mA)
≥ VDROP + VF = 4.35V(max)
Where VIN = Existing bus = 5V
Key advantages:
• No boost circuit needed for LCD or keyboard backlight
• Driver utilizes the existing bus
• Low voltage drop provides the full 20mA LED current at
the lowest possible voltage level.
D1
D2
D3
D4
VIN
GND
FAN5610
IN A
IN B
Micro-Controller
V
IN
(Li-Ion)
D1
D2
D3
D4
VIN
GND
FAN5610
IN A
IN B
Microprocessor
I/O
V
IN
(System Bus)


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