TK65600B Datasheet, PDF (1/12 Pages) TOKO, Inc – INDUCTIVE WHITE LED DRIVER WITH SYNCHRONOUS RECTIFER

TK65600B
ADVANCED
INFORMATION
FEATURES
n Minimum External Components
n Efficiency as High as 80%
n LED Current Regulated
n Internal Synchronous Rectifer
n PWM Signal Intensity Control
n Can Drive Mulitple Strings of 3 WLED in Series
n 700 kHz PWM Operation
n Low Supply Current
n Enable Pin
n Short Circuit Protection
n Over Voltage Protection
n 8 Pin Flip Chip Package
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 opti-
mized 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 predict-
able. With a switching frequency of 700 kHz the operation of
the IC should not disturb 455 kHz IF subsystem.
INDUCTIVE WHITE LED DRIVER
WITH SYNCHRONOUS RECTIFER
APPLICATIONS
n LCD Modules
n Cellular Telephone
n Battery Powered Systems
n 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.
AGND A1
TK65600B
Top View
ENABLE
A2
A3 N/C
VDD B1
B3 FB
VOUT C1
C3 PGND
C2
IND
BLOCK DIAGRAM
VDD
IND
B1
C2
ORDERING INFORMATION
TK65600B
Tape/Reel Code
Package Code
TAPE/REEL CODE
PACKAGE CODE
ENABLE A2
ENABLE
OSC
VREF
GATE DRIVE
PWM
SCP/OVP
A1
AGND
C3
PGND
C1 VOUT
B3 FB
July 2, 2003 TOKO, Inc.
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