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参数资料
| 型号： | DC1274A |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO LTM8040 |
| 设计资源： | LTM8040 Spice Model DC1274A Schematic |
| 标准包装： | 1 |
| 系列： | µModule® |
| 电流 - 输出 / 通道： | 1A |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 13V |
| 特点： | PWM 控制 |
| 输入电压： | 4 V ~ 36 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM8040 |
LTM8040
APPLICATION INFORMATION
Programming LED Current
The LED current can be set by adjusting the voltage on the
ADJ pin. The ADJ pin is internally pulled up to a precision
1.25V voltage source through a 5.11k 1% resistor. This
resistor makes it easy to adjust the LED current with a
single external resistor. For a 1A LED current, leave the
ADJ pin ?oating. For lower output currents, apply a re-
sistor from ADJ to GND as shown in Figure 3, using the
following formula:
Dimming Control
There are several different types of dimming control
circuits. Analog dimming control (Figure 4) changes the
voltage on the ADJ pin by tying a low on-resistance FET to
the resistor. This allows the selection of two different LED
currents. For reliable operation, program an LED current of
no less than 35mA. The maximum current dimming ratio
(I RATIO ) can be calculated from the maximum LED current
(I MAX ) and the minimum LED current (I MIN ) as follows:
R ADJ = 5.11k ? I LED /(1A – I LED ),
where I LED is the desired current out of LEDA.
I MAX
I MIN
= I RATIO
In order to have accurate LED current, a precision 1%
resistor is recommended.
LTM8040
ADJ
LTM8040
ADJ
R2
GND
8040 F04
R ADJ
GND
8040 F03
DIM
Figure 3. Setting ADJ with a Resistor
Figure 4. Dimming with an NFET and Resistor
The LEDA voltage must be at least 2.5V for proper current
regulation. See Table 2 for recommended R ADJ values.
8040fa
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DC1278A | 功能描述:BOARD SAR ADC LTC2351-14 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:QuikEval-II™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| DC1280A | 制造商:Linear Technology 功能描述:EVAL BOARD, LT3471 BOOST / INVERTING REG 制造商:Linear Technology 功能描述:EVAL BOARD, LT3471 BOOST / INVERTING REG; Silicon Manufacturer:Linear Technology; Silicon Core Number:LT3471; Kit Application Type:Power Management; Kit Contents:Evaluation Board for LT3471; Length:40mm |
| DC1281A-A | 制造商:Linear Technology 功能描述:BOARD DEMO 16BIT 160MSPS LTC2209 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd, Rq. DC1371 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd, Rq. DC1371, Silicon Manufacturer:Linear Technology, Silicon Core Number:LTC2209UP, Kit Application Type:Data Converter, Application Sub Type:ADC, Kit Contents:Board, Guide, Features:Also works with requred DC1371 |
| DC1281A-B | 制造商:Linear Technology 功能描述:BOARD DEMO 16BIT 160MSPS LTC2209 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd, Rq. DC1371 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd, Rq. DC1371; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2209UP; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide; Features:Also works with requred DC1371 |
| DC1281A-E | 制造商:Linear Technology 功能描述:16BIT ADC Eval Brd, Rq. DC1371, Silicon Manufacturer:Linear Technology, Silicon |
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