TK65600B Datasheet | Toko America Incorporated

.. ADVANCED INFORMATION Features n n n n n n n n n n n n Minimum External ponents Efficiency as High as 80% LED Current Regulated Internal Synchronous Rectifer PWM Signal Intensity Control Can Drive Mulitple Strings of 3 WLED in Series 700 k Hz PWM Operation Low Supply Current Enable Pin Short Circuit Protection Over Voltage Protection 8 Pin Flip Chip Package INDUCTIVE WHITE LED DRIVER WITH SYNCHRONOUS RECTIFER APPLICATIONS n n n n LCD Modules Cellular Telephone Battery Powered Systems Consumer Electronics The Enable pin can take a PWM signal provided by the user to reduce the display brightness. A PWM signal is prefered to pulse the LEDs with a regulated value of current and to maintain better consistency of chromaticity. DESCRIPTION Toko’s TK65600 White LED Driver IC has been optimized for battery controlled systems where power consumption and size are primary concerns. High efficiency has been optimized for this application. The miniature Flip Chip package device, together with the miniature Toko Coil D31FB or Low Profile D412F Coil, further helps system designers reduce the space required to drive the white LEDs. The IC uses Current-mode PWM (Pulse Width Modulation) method of regulating the current through the string of LEDs. This time-proven method of regulation works at a fixed switching frequency which is preferred in RF systems, because the switching noise RF spectrum is more predictable. With a switching frequency of 700 k Hz the operation of the IC should not disturb 455 k Hz IF subsystem. AGND A1 Top View ENABLE A2 A3 N/C VDD B1 B3 FB VOUT C1 C2 IND C3 PGND BLOCK DIAGRAM B1 C2 ORDERING INFORMATION C1 VOUT ENABLE A2 ENABLE GATE DRIVE Tape/Reel Code Package Code SCP/OVP B3 FB VREF TAPE/REEL CODE PACKAGE CODE A1...