FAN5611/FAN5612/FAN5613/FAN5614

PRODUCT SPECIFICATION

8

REV. 1.0.4 6/4/04

In some cases, there is already a voltage bus in the system,

which can be utilized. Due to the ultra-low voltage drop of

Key advantages:

• No boost circuit needed for LCD or keyboard backlight

• Driver utilizes the existing bus

• Ultra-low voltage drop provides the full 20mA LED

current at the lowest possible voltage level.

Example 3: Drive white, blue, red, amber LEDs

string

Assuming boost circuit, or existing voltage bus, the

FAN561X series of LED drivers can be used to drive a whole

string of LEDs and flexible brightness control - analog

and/or PWM.

Key advantage:

• No need for current matching resistors and discrete

transistor for brightness control

LED Brightness Control

All of the FAN561X LED Drivers feature analog and PWM

controls to give designers flexible brightness control. These

control methods can be applied to the circuit in two different

ways, to provide more flexibility than any other solution. To

under the Typical Performance Characteristics section.

1. FAN5611

- Analog

- PWM

– Amplitude sets maximum LED current

– Pulse width controls between 0 and maximum

2. FAN5612

- Analog

- PWM - 1

I1

I2

I3

I4

GND

FAN5613

CTRL

V

CONTROL

ENABLE

ON/OFF

I1

I2

I3

I4

GND

FAN5613

CTRL

V

CONTROL

'N' number of LEDs Per Branch

ON/OFF

ENABLE

I1

I2

I3

I4

GND

FAN5611

CTRL

V

I

LED

200

V

CONTROL

V

CTRL

–

()

×

R

SET

-------------------------------------------------------------------------

=

I1

I2

I3

GND

FAN5612

CTRL

V

CONTROL

ON/OFF

ENABLE

I

LED

200

V

CONTROL

V

CTRL

–

()

×

R

SET

-------------------------------------------------------------------------

=