LM3501 - 用于白光 LED 应用的同步升压 DC/DC 转换器

LM3501是TI德州仪器公司的一款背光产品，LM3501是用于白光 LED 应用的同步升压 DC/DC 转换器，本站介绍了LM3501的封装应用图解、特点和优点、功能等，并给出了与LM3501相关的TI元器件型号供参考。

LM3501 - 用于白光 LED 应用的同步升压 DC/DC 转换器 - 背光 - LED驱动器 - 德州仪器

产品描述

The LM3501 is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for display backlighting and other lighting functions. With fully integrated synchronous switching (no external schottky diode required) and a low feedback voltage (515 mV), power efficiency of the LM3501 circuit has been optimized for lighting applications in wireless phones and other portable products (single cell Li-Ion or 3-cell NiMH battery supplies). The LM3501 operates with a fixed 1 MHz switching frequency. When used with ceramic input and output capacitors, the LM3501 provides a small, low-noise, low-cost solution.

Two LM3501 options are available with different output voltage capabilities. The LM3501-21 has a maximum output voltage of 21V and is typically suited for driving 4 or 5 white LEDs in series. The LM3501-16 has a maximum output voltage of 16V and is typically suited for driving 3 or 4 white LEDs in series (maximum number of series LEDs dependent on LED forward voltage). If the primary white LED network should be disconnected, the LM3501 uses internal protection circuitry on the output to prevent a destructive overvoltage event.

A single external resistor is used to set the maximum LED current in LED-drive applications. The LED current can easily be adjusted by varying the analog control voltage on the control pin or by using a pulse width modulated (PWM) signal on the shutdown pin. In shutdown, the LM3501 completely disconnects the input from output, creating total isolation and preventing any leakage currents from trickling into the LEDs.

产品特性

Synchronous Rectification, High Efficiency and no External Schottky Diode required
Uses Small Surface Mount Components
Can Drive 2-5 White LEDs in Series (May Function with More Low VF LEDs)
2.7V to 7V Input Range
True Shutdown Isolation, no LED Leakage Current
DC Voltage LED Current Control
Input Undervoltage Lockout
Internal Output Over-Voltage Protection (OVP) Circuitry, with no External Zener Diode Required LM3501-16: 15.5V OVP; LM3501-21: 20.5V OVP.
Requires Only a Small 16V (LM3501-16) or 25V (LM3501-21) Ceramic Capacitor at the Input and Output
Thermal Shutdown
0.1µA shutdown Current
Small 8-Bump Thin DSBGA Package

下面可能是您感兴趣的TI德州仪器公司背光元器件

TI公司产品现货专家，订购TI公司产品不限最低起订量，TI芯片大陆现货即时发货，香港库存3-5天发货，海外库存7-10天发货

寻找全球TI代理商现货货源 - TI公司（德州仪器）电子元件在线订购