- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄48094 > YB1520 (YOBON TECHNOLOGIES, INC.) High Power Step-up DC-DC Converter, White LED Driver PDF資料下載
參數(shù)資料
| 型號(hào)： | YB1520 |
| 廠商： | YOBON TECHNOLOGIES, INC. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | High Power Step-up DC-DC Converter, White LED Driver |
| 中文描述： | 高功率升壓型DC - DC轉(zhuǎn)換器，白光LED驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 7/18頁 |
| 文件大?。?/td> | 1900K |
| 代理商： | YB1520 |
YB1520
High Power Step-up DC-DC Converter, White LED Driver
YB1520 MRev.1.2
www.yobon.com.tw
15
Functional Block
Operation
The YB1520 uses a constant frequency,
current mode control scheme to regulate
the output LED current. Its operation can
be understood by referring to the block
diagram in Figure 3. At the start of each
oscillator cycle, a voltage proportional to
the switch current is added to a ramp
output and the resulting sum is fed into the
positive terminal of the PWM comparator.
When this voltage exceeds the level of the
comparator negative input, the peak current
has been reached, and the SR latch is
reset and turns off the power switch. The
voltage at the negative input of the
comparator comes from the output of the
error amplifier. The error amplifier sets the
correct peak current level to keep the
output in regulation. If the error amplifier’s
output increases, more current is delivered
to the output; if it decreases, less current is
delivered.
Application Information
Inrush Current
The maximum switch current is limited to
about 900 mA by the chip Typically, A larger
Cout will increase the duration of high
current.
However, when Vin is first
connected, an even larger current can flow
into Cout. This occurs when the SW pin is
open circuit and the Cout voltage changes
from 0V to Vin in a few microseconds.
Because the duration of this large current is
short, it will usually not cause problems. If
this current is not desirable, an external
soft-start
circuit
can
be
added
to
significantly reduce this inrush current.
Figure 3: YB1520 Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| YB1696-50 | 150KHz, 3A PWM Buck Switching Regulator |
| YB1696-ADJ | 150KHz, 3A PWM Buck Switching Regulator |
| YB1696 | 150KHz, 3A PWM Buck Switching Regulator |
| YBG1105W-RR | SINGLE COLOR LED, GREEN, 1.6 mm |
| YPY1105W-RR | SINGLE COLOR LED, YELLOW GREEN, 1.6 mm |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| YB1520ST25 | 制造商:YOBON 制造商全稱:YOBON 功能描述:High Power Step-up DC-DC Converter, White LED Driver |
| YB1521 | 制造商:YOBON 制造商全稱:YOBON 功能描述:High Power Step-Up DC-DC Converter & WLED Driver |
| YB1521ST25 | 制造商:YOBON 制造商全稱:YOBON 功能描述:High Power Step-Up DC-DC Converter & WLED Driver |
| YB1522 | 制造商:YOBON 制造商全稱:YOBON 功能描述:Step-up DC-DC Converter White LED Driver |
| YB1522ST25 | 制造商:YOBON 制造商全稱:YOBON 功能描述:Step-up DC-DC Converter White LED Driver |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。