LM3503ITL-25EV National Semiconductor, LM3503ITL-25EV Datasheet - Page 3

• Manufacturer Part Number: LM3503ITL-25EV
• Description: BOARD EVALUATION LM3503ITL-25
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3503ITL-25EV

• Current - Output / Channel: 9mA
• Outputs And Type: 2, Non-Isolated
• Voltage - Output: 25 V
• Features: Dual Display(s)
• Voltage - Input: 2.7 ~ 5.5V
• Utilized Ic / Part: LM3503
• Core Chip: LM3503
• Topology: Boost
• No. Of Outputs: 1
• Output Voltage: 25V
• Input Voltage: 2.5V To 5.5V
• Development Tool Type: Hardware - Eval/Demo Board
• Lead Free Status / RoHS Status: Not applicable / Not applicable

PWM Dimming
(Continued)
20168903
FIGURE 3. Typical Circuit for PWM Dimming (LM3503)
LED Current Setting
LEDcurrent is set using the following equation for LM3502/LM3503:
If analog control is used for brightness control in the LM3503, the relationship between V
and V
can be determined by
FB
CNTRL
using the following equation:
For LM3502, the typical V
is 0.25V to solve for I
, or by rearranging I
equation to solve for R
.
FB
LED
LED
1
3
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