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ISL97634 Datasheet(PDF) 3 Page - Intersil Corporation

No. de pieza ISL97634
Descripción Electrónicos  White LED Driver with Wide PWM Dimming Range
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL97634 Datasheet(HTML) 3 Page - Intersil Corporation

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3
FN6264.2
April 10, 2007
Block Diagram
Pin Description
PIN
NUMBER
PIN
NAME
DESCRIPTION
1
GND
Ground Pin. Connect to local ground.
2
VIN
Input Supply Pin. Connect to the input supply voltage, the inductor and the input supply decoupling capacitor.
3
PWM/EN
PWM or Enable Pin. Connect external PWM signal allows pulse width modulation current operation. Enable
signal allows peak current operation or disable signal shuts down the device.
4
NC
No Connect
5
FB
Feedback Pin. Connect the sense resistor between FB and ground. The cathode of bottom LED can also
be connected at this pin if the output current is not to be PWMed.
6
FBSW
FB Disconnect Switch. Connect to the cathode of the bottom LED if the output current to be PWMed.
7
VOUT
Output Pin. Connect to the anode of the top LED and the output filter capacitor.
8
LX
Switching Pin. Connect to inductor.
FET
PWM LOGIC
CONTROLLER
GM
AMPLIFIER
95mV
GM AMP
COMPENSATION
PWM
COMPARATOR
VIN
PWM/EN
LX
GND
FB
RSET
COUT
L
VIN (2.4V to 5.5V)
2 LEDs to 6 LEDS
CIN
ISL97634
VOUT
BANDGAP
REFERENCE
GENERATOR
FBSW
PWM/EN
DRIVER
GM AMP
COMPENSATION
CURRENT
SENSE
1.4MHZ OSCILLATOR AND RAMP
GENERATOR
ISL97634


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