LM3508TLEV National Semiconductor, LM3508TLEV Datasheet - Page 8

• Manufacturer Part Number: LM3508TLEV
• Description: BOARD EVALUATION FOR LM3508TL
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3508TLEV

• Current - Output / Channel: 20mA
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 17V
• Features: Dimmable
• Voltage - Input: 2.7 ~ 5.5V
• Utilized Ic / Part: LM3508
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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VIN = 3.6V, V
Channel 1: V
Channel 4: I
Time Base: 400µs/div
V
Channel 1: V
Channel 2: I
Time Base: 200µs/div
V
Channel 1: V
Channel 3: V
Channel 2: I
Channel 4: DIM (DC Coupled, 2V/div)
Time Base: 10µs/div
IN
IN
Typical Operating Waveforms (DIM With 20kHz Square
= 3.6V, I
= 3.6V, 4 LEDs, I
IN
LED
IN
L
OUT
OUT
OUT
IN
OUT
(DC Coupled, 100mA/div)
(500mA/div)
(100mA/div)
(AC Coupled, 100mV/div)
= 30mA
(1V/div)
(10V/div)
(AC Coupled, 200mV/div)
Over-Voltage Protection Function
= 18.86V
Output Short-Circuit Response
LED
= 15mA
Wave)
30004237
30004256
30004230
8
V
Channel 1: V
Channel 3: V
Channel 4: I
Time Base: 200µs/div
V
Channel 1: V
Channel 2: V
Channel 4: I
Time Base: 400ns/div
V
Channel 4: I
Channel 2: V
Channel 1: DIM (DC Coupled, 2V/div, 20kHz, 50% duty cycle)
Channel 3: I
Time Base: 400µs/div
IN
IN
IN
= 3.6V, 4 LEDs
= 3.6V, 4 LEDs, I
= 3.6V
DIM Operation (I
LED
L
LED
IN
Typical Operating Waveforms (DIM High)
OUT
IN
OUT
SW
OUT
(DC Coupled, 100mA/div)
(DC Coupled, 200mA/div)
(AC Coupled, 500mV/div)
(DC Coupled, 5mA/div)
(DC Coupled, 10mA/div)
(DC Coupled, 10V/div)
(AC Copupled, 1V/div)
(AC Coupled, 100mV/div)
(AC Coupled, 2V/div)
LED
= 30mA, V
Line-Step Response
LED
changing from 30mA to 15mA)
OUT
= 15.8V
30004229
30004255
30004238