SP7616 datasheet(7/11 Pages) EXAR

Part #	SP7616

Description	High Accuracy 4-Channel Low Side LED Driver for CCFL Replacement

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Manufacturer	EXAR [Exar Corporation]

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Rev. 2.0.4

THEORY OF OPERATION

INTRODUCTION

The SP7616 is a four-channel constant current

source LED driver with programmable output

current level. The design consists of a

regulator reference voltage source, current

amplifier, and output driver. The precision

reference voltage ensures good performance

over voltage and temperature. The four

outputs are tightly coupled allowing for

excellent LED current matching.

SETTING LED CURRENT

The current in the LED strings is set by

adjusting the RSET resistor connected between

the ISET pin and ground. The LED current is

set using the following the following equation.

mA

R

K

I

SET

LED

=

Where:

K = Output Current Multiplication Ratio

ILED is the desired LED current

PWM DIMMING

The LED dimming control is done through the

PWM pin. The acceptable frequency range of

this signal is 100Hz to 5kHz. The acceptable

duty cycle range of the signal is 10% to 90%

at 1KHZ. When the PWM pin is driven low,

only the LED current sources are disabled

while the rest of the chip is still enabled.

ANALOG DIMMING CONTROL

Besides digital PWM control, the LED current

can be controlled continuously (from high to

low LED current) by raising the voltage at the

bottom of RSET, VMOD, from 0.0V to 1V

maximum.

This configuration is shown in

figure 1 below.

Figure 1

The RSET value may be determined from the

previous equation for VMOD = 0V.

The

equation below shows the effect of using a

VMOD in the circuit on the LED current.

()

mA

R

K

V

I

SET

MOD

LED

−

≈ 1

Where:

1V = Typical ISET Voltage

K = Output Current Multiplication Ratio

ILED is the desired LED current

VMOD is the adjustment voltage

Note that this method of current control is not

as precise as adjusting RSET. The voltage at

the ISET pin is adjusted slightly during

manufacturing to ensure that K, the output

current multiplication ratio, is as accurate as

possible.

When the SP7616 was originally

released at the end of 2006, the multiplication

ratio

and

ISET

voltage

were

specified

separately.

However, market feedback for

better

accuracy

when

using

RSET alone

prompted the change to the way the part is

specified today.

SHUTDOWN USING ISET PIN

In normal operation, the voltage at ISET pin is

around 1V. To ensure fast turn on at low duty

cycle and high PWM frequency, only the

output drivers are switching in PWM mode.

However, the whole chip can be shutdown by

pulling the voltage at ISET above 3V minimum.

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