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| 型号： | ZXSC400E6TA |
| 厂商： | Diodes Inc |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT SOT23-6 |
| 特色产品： | LED Driver Solutions |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 200kHz |
| 电源电压： | 1.8 V ~ 8 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 剪切带 (CT) |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1478 (CN2011-ZH PDF) |
| 其它名称： | ZXSC400E6TACT |
ZXSC400
DESIGN INFORMATION
IC operation description
Bandgap Reference
All threshold voltages and internal currents are
derived from a temperature compensated bandgap
reference circuit with a reference voltage of 1.22V
nominal.
Dynamic Drive Output
Depending on the input signal, the output is either
“ LOW ” or “ HIGH ” . In the high state a 2.5mA current
source (max drive voltage = V CC -0.4V) drives the base
or gate of the external transistor. In order to operate
the external switching transistor at optimum
efficiency, both output states are initiated with a short
transient current in order to quickly discharge the base
or the gate of the switching transistor.
Switching Circuit
The switching circuit consists of two comparators,
Comp1 and Comp2, a gate U1, a monostable and the
drive output. Normally the DRIVE output is “ HIGH ” ; the
external switching transistor is turned on. Current
ramps up in the inductor, the switching transistor and
external current sensing resistor. This voltage is
sensed by comparator, Comp2, at input I SENSE . Once
the current sense voltage across the sensing resistor
exceeds 30mV, comparator Comp2 through gate U1
triggers a re-triggerable monostable and turns off the
output drive stage for 2 s. The inductor discharges to
the load of the application. After 2 s a new charge
cycle begins, thus ramping the output voltage. When
the output voltage reaches the nominal value and FB
gets an input voltage of more than 300mV, the
monostable is forced “ on ” from Comp1 through gate
U1, until the feedback voltage falls below 300mV. The
above action continues to maintain regulation.
Pin functions
Block diagram
2μs
Pin No.
1
2
3
4
5
6
Name
V CC
GND
STDN
SENSE
V FB
DRIVE
Description
Supply voltage, 1.8V to 8V.
Ground
Shutdown
Inductor current sense input. Internal threshold voltage set to 30mV. Connect
external sense resistor
Reference voltage. Internal threshold set to 300mV. Connect external resistor
to program LED current
Drive output for external switching transistor. Connect to base or gate of
external switching transistor.
ISSUE 1 - JANUARY 2003
4
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相关代理商/技术参数 |
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| ZXSC400E6TA-CUT TAPE | 制造商:DIODES 功能描述:ZXSC400 Series 50 mA 200 kHz Surface Mount LED Driver Boost Converter - SOT-23-6 |
| ZXSC400EV2 | 制造商:ZETEX 制造商全称:ZETEX 功能描述:circuit diagram and bill of materials |
| ZXSC410 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:VOLTAGE MODE BOOST CONVERTER |
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| ZXSC410E6TA | 功能描述:开关变换器、稳压器与控制器 G.P. Boost W/Shtdwn RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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