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| 型号： | SC628AULTRT |
| 厂商： | Semtech |
| 文件页数： | 12/21页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC628AULDKR |
SC628A
Applications Information
General Description
This design is optimized for handheld applications
supplied from a single Li-Ion cell and includes the
following key features:
The device also requires a 4.7μF capacitor on the IN pin
and a 4.7μF capacitor on the OUT pin to minimize noise
and support the output drive requirements. Capacitor
case size is an important factor in the performance of
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A high effi ciency fractional charge pump that
supplies power to the flash LED
An LED flash output that provides up to 1000mA
of momentary current or up to 275mA of
continuous spotlight current
An I 2 C compatible interface that provides control
of all device functions
the SC628A. Due to the poor DC coeffi cient of the 0402
size (1005 metric), 0603 size (1608 metric) capacitors are
strongly recommended to achieve the rated electrical
specifications and performance shown in the typical
characteristics section.
Capacitors with X7R or X5R ceramic dielectric are
strongly recommended for their low ESR and superior
temperature and voltage characteristics. Y5V capacitors
High Current Fractional Charge Pump
The flash output is supported by a high effi ciency, high
current fractional charge pump output at the OUT pin.
The charge pump multiplies the input voltage by 1, 1.5, or
2 times. The charge pump switches at a fixed frequency of
250kHz in 1.5x and 2x modes and is disabled in 1x mode
to save power and improve effi ciency.
The mode selection circuit automatically selects the
1x, 1.5x or 2x mode based on circuit conditions. Circuit
conditions such as low input voltage, high output current,
or high LED voltage place a higher demand on the
charge pump output. A higher numerical mode may be
needed momentarily to maintain regulation at the OUT
pin during intervals of high demand, such as the high
current of an LED flash or the droop at the IN pin during
a supply voltage transient. The charge pump responds
to these momentary high demands, setting the charge
pump to the optimum mode (1x, 1.5x or 2x), as needed
to deliver the output voltage and load current while
optimizing effi ciency. Hysteresis is provided to prevent
mode toggling.
The charge pump requires two bucket capacitors for
low ripple operation. One capacitor must be connected
between the C1+ and C1- pins and the other must be
connected between the C2+ and C2- pins as shown in
the typical application circuit diagram. These capacitors
should be equal in value, with a minimum capacitance of
2.2μF to support the charge pump current requirements.
should not be used as their temperature coeffi cients
make them unsuitable for this application.
LED Flash and Spotlight Current Sink
A single output current sink is provided to drive both
flash and spotlight functions. In flash mode, this current
sink provides up to 1000mA for a flash LED or array of
parallel LEDs . Flash current settings are available in 21
values from 300mA to 1000mA. Flash steps increments
are no larger than 75mA nominally. Some additional
settings that have smaller increments of 50mA, 25mA
and 12.5mA. Table 1 on page 12 contains detailed current
setting information for flash mode. The FLEN pin directly
triggers the FLASH function when pulled high, or it can
be wired to IN to enable software control via the serial
interface.
In spotlight mode, the output can be set for up to 275mA
of continuous current. Settings are available in 25mA
increments from 25mA to 275mA, with some additional
settings that have smaller increments of 12.5mA. Table 2
on page 13 contains detailed current setting information
for spotlight mode. Continuous operation above 275mA
is not recommended due to high power dissipation.
Flash and Spotlight Safety Timer
A safety timer disables the flash and spotlight output
current sink if the sink remains active for an extended
period. The timer protects the SC628A and the LED from
high power dissipation that can cause overheating. The
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC628B | 制造商:Mallory Sonalert Products Inc 功能描述: |
| SC628-BTR | 功能描述:DC Buzzer Single Tone 2.9kHz Piezo 6 ~ 28V 80dB @ 6V, 61cm 制造商:mallory sonalert products inc. 系列:SC 包装:散装 零件状态:有效 驱动器电路:指示灯，内部驱动 输入类型:DC 电压 - 额定:- 电压范围:6 ~ 28V 频率:2.9kHz 技术:压电 工作模式:单音调 持续时间:- 声压级:80dB @ 6V，61cm 电流 - 电源:3 ~ 18mA 端口位置:顶部 工作温度:-30°C ~ 65°C 认可:cUL，UL 等级:- 安装类型:面板安装 端接:快速连接接片 - 0.250"（6.35mm） 大小/尺寸:42.9mm 直径 高度 - 安装（最大值）:* 标准包装:1 |
| SC628CPN | 功能描述:音频指示器及警报器 CHIME, 6-28VDC 2900HZ, CUL APPRVD RoHS:否 制造商:PUI Audio 产品:Indicators 声压级:85 dB 音调:Continuous 频率:2300 Hz +/- 300 Hz 电压额定值:5 VDC 电流额定值:30 mA 端接类型: 直径:12 mm 安装:Through Hole |
| SC628CPNR | 功能描述:音频指示器及警报器 CHIME, 6-28VDC 2900HZ, CUL APPRVD RoHS:否 制造商:PUI Audio 产品:Indicators 声压级:85 dB 音调:Continuous 频率:2300 Hz +/- 300 Hz 电压额定值:5 VDC 电流额定值:30 mA 端接类型: 直径:12 mm 安装:Through Hole |
| SC628D | 功能描述:音频指示器及警报器 MED CONTINUOUS 6-28V RoHS:否 制造商:PUI Audio 产品:Indicators 声压级:85 dB 音调:Continuous 频率:2300 Hz +/- 300 Hz 电压额定值:5 VDC 电流额定值:30 mA 端接类型: 直径:12 mm 安装:Through Hole |
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