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LT3595EUHH-TRPBF

16 Channel Buck Mode LED Driver

Linear Technology 

LT3595

APPLICATIONS INFORMATION

Dimming Control

The sixteen PWM1-16 inputs control the dimming func-

tion. Each channel is modulated by its corresponding

PWM1-16 input. On a rising edge of any PWM1-16, the

IC’s internal support circuitry is enabled and the specific

channel turns on. LED current flows in the channel until

the falling edge of the PWM1-16 input. In this way, the

average LED current is modulated. The minimum on time

of a channel is 2μs and the maximum period is 10ms (at

100Hz). Therefore, the maximum dimming ratio is 5000:1.

Since the maximum RSET produces 10mA, the minimum

modulated LED current is 2μA.

When multiple channels are modulated, the rising edges

of PWM1-16 must be synchronized. The falling edges may

be asynchronous. A sample timing diagram is shown in

Figure 3.

SYNCHRONIZED RISING EDGES

PWM1-4

tON(MIN) = 2μs

PWM5-8

tMAX = 10ms

PWM9-16

ILED1-4

ILED5-8

ILED9-16

3595 F03

Figure 3. Timing Diagram for Multi-Channel Modulation

3595f

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