LTC3524_15 Datasheet, PDF (5/16 Pages) Linear Technology – Adjustable TFT Bias Supply with WLED Driver

LTC3524
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
LCD Bias Sequencing
VH
5V/DIV
V2X
VN ^VOUT
5ms/DIV
LCD Bias Sequencing
SW1 Voltage and 10μH Inductor
Current at 25mA Load
5V/DIV
200mA/DIV
3524 G11
VH
V_OUT
SW1
2V/DIV
VN
I_LCD BOOST INDUCTOR CURRENT
I_LCD BOOST
INDUCTOR
CURRENT
50mA/DIV
5ms/DIV
3524 G12
200ns/DIV
3524 G13
SW1 Voltage and 10μH Inductor
Current at 5mA Load
SW2 Voltage and 4.7μH Inductor
Current at 20mA
SW1
2V/DIV
I_LCD BOOST
INDUCTOR
CURRENT
50mA/DIV
200ns/DIV
SW2
200mV/DIV
I_LCD BOOST
INDUCTOR
CURRENT
200mA/DIV
SW2
5V/DIV
3524 G14
200ns/DIV
3524 G15
LED Initial Start-Up Waveforms
500mV/DIV
I_LED BOOST
INDUCTOR
CURRENT
V_LED
5V/DIV
LED1
LED2
50μs/DIV
3524 G16
LED Burst Dimming Waveforms
LED1 and SW2
E_LED1 AND
E_LED2
I_LED BOOST
INDUCTOR
LED1
SW2
12V
500μs/DIV
5V/DIV
200mA/DIV
10V/DIV
10V/DIV
3524 G17
LED Burst Dimming Waveforms
LED2 and VLED
E_LED1 AND
E_LED2
I_LED BOOST
INDUCTOR
V_LED
LED2
12.5V
12V
500μs/DIV
5V/DIV
200mA/DIV
10V/DIV
10V/DIV
3524 G18
3524f
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