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參數(shù)資料
| 型號(hào)： | STCS1PHR |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | 1.5 A max constant current LED driver |
| 中文描述： | 1.5 A的最大恒定電流LED驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 9/17頁(yè) |
| 文件大?。?/td> | 406K |
| 代理商： | STCS1PHR |
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STCS1
Detail description
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7
Detail description
The STCS1 is a BicMOS constant current source designed to provide a precise constant
current starting from a varying input voltage source. The main target is to replace discrete
components solution for driving LEDs in low voltage applications such as 5 V, 12 V or 24 V
giving benefits in terms of precision, integration and reliability.
7.1
Current setting
The current is set with an external sensing resistor connected to the FB pin. The feedback
voltage is 100 mV, then a low resistor value can be chosen reducing power dissipation. A
value between 1 mA and 1.5 A can be set according to the resistor value, the resulting
output current has a tolerance of ±10%.
7.2
Enable
When the enable pin is low the device completely off thus reducing current consumption to
less than 1 μA. When in shutdown mode, the internal main switch is off.
7.3
PWM dimming
The PWM input allows implementing PWM dimming on the LED current; when the PWM
input is high the main switch will be on and vice versa. A typical frequency range for the
input is from few Hertz to 50 kHz. The maximum dimming frequency is limited by the
minimum rise/fall time of the current which is around 4 μs each. Above 50 kHz the current
waveforms starts assuming a triangular shape.
While the PWM input is switching, the overall circuitry remains on, this is needed in order to
implement a short delay time TD (see
Figure 3.
).
Since the PWM pin is controlling just the main switch, the overall circuitry is always on and it
is able to control the delay time between the PWM input signal and the output current in the
range of few μs, this is important to implement synchronization among several light LED
sources.
7.4
Diagnostic
When STCS1 is in on mode (EN is high), the device is able to detect disconnection or fail of
the LED string monitoring V
DRAIN
pin. If V
DRAIN
is lower than 75 mV the DISC pin is pulled
low regardless the PWM pin status. This information can be used by the system to inform
that some problem happens in the LEDs.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STCS1PUR | 功能描述:LED照明驅(qū)動(dòng)器 1.5A MAX CONSTANT CURRENT LED DRIVER RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| STCS2 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 A max constant current LED driver?1 |
| STCS2_0807 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 A max constant current LED driver?1 |
| STCS2A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 A max constant current LED driver |
| STCS2ASPR | 功能描述:LED照明驅(qū)動(dòng)器 2 A Max Const LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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