DC780B 演示电路是一款采用 LT1618 的恒流/恒压 1.4MHz 升压
DC/DC 转换器。 DC780B 演示了一款通用升压转换器，可从 3.3V-4.2V 电源输出 12V、250mA。该演示板还可用作 LED 驱动器，其中 Luxeon LED（未安装）由 500mA 的调节电流（默认电流）和 3.5V 的
正向电压驱动。通过将 R4 的值更改为 2.2M，可以将 LED 电流调节为 250mA。 LT1618 可用于更宽的输入电压，但输出电压
电平和元件选择将该演示电路限制为锂
离子电池输入电平
说明
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DC780B, Demonstration Circuit is a Constant-Current/Constant-Voltage 1.4MHz Step-up DC/DC Converter featuring the LT1618. The DC780B demonstrates a general purpose Boost converter with a 12V, 250mA output from a 3.3V-4.2V source. The demo board can also be used as an LED driver, where a Luxeon LED (not installed), is driven with a regulated current of 500mA (default current), at a forward voltage of 3.5V. By changing the value or R4 to 2.2M the LED current can be regulated at 250mA. The LT1618 can be used for wider input voltages, but output voltage level and component selection restrict this demo circuit to Lithium Ion battery input levels
主要特色
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Conversion Type
DC to DC
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Input Voltage
3.3 to 4.2 V
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Output Voltage
12 V
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Output Current
0.25 A
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Efficiency
83 %
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Topology
Boost
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