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ISL97634 Datasheet(PDF) 3 Page - Intersil Corporation |
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ISL97634 Datasheet(HTML) 3 Page - Intersil Corporation |
3 / 10 page 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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