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PDF IS31PW3500 Data sheet ( Hoja de datos )
| Número de pieza | IS31PW3500 | |
| Descripción | 1.1MHZ BOOST CONVERTER | |
| Fabricantes | ISSI | |
| Logotipo |  |
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IS31PW3500
1.1MHZ BOOST CONVERTER WITH 30V INTERNAL FET SWITCH
February 2012
GENERAL DESCRIPTION
The IS31PW3500 is a constant current step-up
converter. The step-up converter topology allows
series connection of the white LEDs so the LED
currents are identical for uniform brightness as well as
constant output voltage to drive other devices. The
IS31PW3500 switches at 1.1MHz, allowing the use of
tiny external components. The input and output
capacitor can be as small as 1μF, saving space and
cost versus alternative solutions. A low 0.25V
feedback voltage minimizes power loss in the current
setting resistor for better efficiency. The IS31PW3500
is available in small DFN-8, 2mm × 2mm package.
FEATURES
2.4V to 5.5V input range
26V output with over voltage protection
High efficiency :85 % typical
PWM dimming control
Internal high power 30V MOSFET switch
Fast 1.1MHz switching frequency
Small, low-profile inductors and capacitors
DFN-8, 2mm × 2mm package
RoHS compliant and 100% lead (Pb)-free
APPLICATIONS
Mobile phone
Digital still camera
PDAs, handheld computers
MP3 players
GPS receivers
TYPICAL APPLICATION CIRCUIT
http://www.DataSheet4U.net/
Figure 1 Typical Application Circiut
Integrated Silicon Solution, Inc. – www.issi.com
Rev.A, 12/30/2011
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
IS31PW3500
APPLICATION INFORMATION
CONSTANT OUTPUT VOLTAGE
Figure 3 is an application of IS31PW3500 for backlight of main panel and flashlight. Setting the divider-resistors
(R1 & R2) is to get a constant output voltage that depends on the forward voltage and the numbers of
series-LEDs. There are three kinds of mode controlled by the switches - backlight mode /flashlight mode
/backlight + flashlight mode. It can turn on backlight or flashlight at one time or both at the same time. Applying
different duty cycle of PWM signal above 22kHz to backlight's switch can also control the brightness. The
following formula (2), (3) can determine R3.
VOUT = (R2+R1×0.25V/R2
R3 = VOUT - 3VFB - VDS /Ib
VDS = Ib×RDS(ON)
(1)
(2)
(3)
C1 C2
10μF 1μF
LX
10μH
VIN LX
IS3S1NPW35305000
PGND
FB
EN GND
D1 C1
10μF
R1
239k
VOUT=12V
VFF
Ib
R3
R2
5.1k
GPIO1
Dimming
Control
Figure 2 Constant Output Voltage for Backlight and Flashlight
CONSTANT OUTPUT VOLTAGE FOR CLASS-G AUDIO AMPLIFIERhttp://www.DataSheet4U.net/
Figure 4 is another application for driving Class G Audio Amplifier, IS31AP4915. Setting the divider-resistors (R1 &
R2) is to get a higher constant output voltage that can drive audio amplifier intends to get larger audio power. The
following formula (4) can determine the output voltage. Other applications for Audio amplifier, please contact us for
more information.
VOUT = (R2+R1)×0.25V/R2
(4)
IS31PW3500
IS31AP4915
Figure 3 Constant Output Voltage for Class-G Audio Amplifier
Integrated Silicon Solution, Inc. – www.issi.com
Rev.A, 12/30/2011
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page | ||
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| PDF Descargar | [ Datasheet IS31PW3500.PDF ] | |
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