LP5522TMEV National Semiconductor, LP5522TMEV Datasheet - Page 6

• Manufacturer Part Number: LP5522TMEV
• Description: BOARD EVAL LP5522 LED DRIVER
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP5522TMEV

• Current - Output / Channel: 20mA
• Outputs And Type: 1, Non-Isolated
• Features: USB Interface
• Voltage - Input: 2.7 ~ 5.5V
• Utilized Ic / Part: LP5522
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -

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LED Driver Operational Description
The LP5522 LED driver is constant current source. Current can be set with external resistor (R
resistor and LED is 1:400. R
adjusted using equation I
Use of external resistor is optional. If external resistor is not connected, default output current is 5 mA. When external resistor is
not used ISET pin should be connected to VDD.
LED Driver Typical Performance Characteristics
T
R
J
ISET
= 25°C. Unless otherwise noted, typical performance characteristics apply to the LP5522 Block Diagram with: V
= 24 kΩ, C
Output Current vs R
Output Current vs Input Voltage
IN
(ISET Connected To VDD)
= 100 nF.
OUT
ISET
= 480/R
ISET
current correlates to ISET reference voltage (V
(Expanded Range)
ISET
.
202172301
20217299
6
Output Current vs Headroom Voltage
ISET
). Consequently, current through LED can be
Output Current vs R
ISET
) so that the current ratio between
ISET
202172300
202172302
IN
= 3.6V,