LM3509SDX National Semiconductor Corporation, LM3509SDX Datasheet - Page 10

• Manufacturer Part Number: LM3509SDX
• Description: High Efficiency Boost For White Led S And/or Oled Displays With Dual Current Sinks And I2c Compatible Brightness Control
• Manufacturer: National Semiconductor Corporation

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Channel 1: SDA (5V/div)
Channel 2: V
Channel 3: I
Channel 4: I
Time Base: 400µs/div
Channel 1: V
Channel 2: I
Time Base: 200µs/div
Channel 3: SDA (2V/div)
Channel 1: V
Channel 2: I
Time Base: 400µs/div
(V
OUT
Transition From OLED to OLED + 1 × 4 LED)
LED
IN
OUT
MAIN
= 18V, I
OUT
OUT
OUT
(500mA/div)
(50mA/div)
(20mA/div)
(20mA/div)
(10V/div)
(AC Coupled, 500mV/div)
(AC Coupled, 200mV/div)
Start-Up Waveform (LED Mode)
(2 × 5 LEDs, 30mA per string)
(V
OUT
Load Step (OLED Mode)
OUT
= 40mA, I
= 18V, C
LED
OUT
= 20mA, C
= 2.2µF)
30004325
OUT
30004326
30004328
= 2.2µF)
10
Channel 1: SDA (5V/div)
Channel 2: V
Channel 3: I
Channel 4: I
Time Base: 400µs/div
Channel 1: V
Channel 2: V
Time Base: 200µs/div
Channel 2: I
Channel R1: I
Channel 1: RESET (2V/div)
Time Base: 200ns/div
(2 × 5 LEDs, 30mA per String, C
OUT
IN
SUB
OUT
OUT
IN
MAIN
(500mA/div)
(AC Coupled, 500mV/div)
(50mA/div)
(20mA/div)
(10V/div)
(AC Coupled, 500mV/div)
Start-Up Waveform (OLED Mode)
(20mA/div)
(V
Line Step (LED Mode)
OUT
RESET Functionality
= 18V, I
OUT
= 60mA)
OUT
30004327
= 1µF)
30004352
30004354