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LM3502ITL-16 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM3502ITL-16 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page LM3502 Step-Up Converter for White LED Applications General Description The LM3502 is a white LED driver for lighting applications. For dual display or large single white LED string backlighting applications, the LM3502 provides a complete solution. The LM3502 contains two internal whitle LED current bypass FET(Field Effect Transitor) switches that are ideal for con- troling dual display applications. The while LED current can be adjusted with a PWM signal directly from a microcontrol- ler without the need of an RC filter network. With no external compensation, cycle-by-cycle current limit, over-voltage protection, and under-voltage protection, the LM3502 offers superior performance over other application specific standard product step-up white LED drivers. Features n Drive up to 4, 6, 8 or 10 white LEDs for Dual Display Backlighting n > 80% efficiency n Output Voltage Options: 16V , 25V , 35V, and 44V n Input Under-Voltage Protection n Internal Soft Start Eliminating Inrush Current n 1 MHz Constant-Switching Frequency n Wide Input Voltage: 2.5V to 5.5V n Small External Components n Low Profile Packages: <1 mm Height -10 Bump MicroSMD -16 Pin LLP Applications n Dual Display BackLighting in Portable Devices n Cellular Phones and PDAs Typical Application 20131701 FIGURE 1. Blacklight Configuration with 10 White LEDs September 2005 © 2005 National Semiconductor Corporation DS201317 www.national.com |
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