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參數(shù)資料
| 型號(hào)： | SC4905B |
| 廠商： | Semtech Corporation |
| 英文描述： | High Performance Voltage Mode PWM Controller |
| 中文描述： | 高性能電壓模式PWM控制器 |
| 文件頁(yè)數(shù)： | 11/24頁(yè) |
| 文件大?。?/td> | 378K |
| 代理商： | SC4905B |
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SC4905A/B
POWER MANAGEMENT
Application Information (Cont.)
2006 Semtech Corp.
www.semtech.com
11
START UP SEQUENCE
Initially during the power up, the SC4905 is in the under
voltage lock out condition. As the VDD supply exceeds
the UVLO limit of the SC4905 and the VFF pin exceeds
the line under voltage lock out of about 1.2V, the inter-
nal reference, oscillator, and logic circuitry are powered
up.
The OUT driver is not enabled until the line under voltage
lock out limit is reached. At that point, once the FB pin
has reached above 600mV, the output driver is enabled.
As the output voltage starts to increase, the error signal
from the error amplifier starts to decrease. If isolation is
required, the error amplifier output can drive the LED of
the opto isolator. The output of the opto is connected in
a common emitter configuration with a pull up resistor to
a reference voltage connected to the FB pin of the
SC4905. The voltage level at the FB pin provides the duty
cycle necessary to achieve regulation.
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| SC4905BIMSTR | High Performance Voltage Mode PWM Controller |
| SC4905BIMSTRT | High Performance Voltage Mode PWM Controller |
| SC4905A | High Performance Voltage Mode PWM Controller |
| SC4910A | High Performance Secondary Side Controller with Synchronous Rectifier |
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相關(guān)代理商/技術(shù)參數(shù) |
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| SC4905BIMS.TR | 制造商:Semtech Corporation 功能描述: |
| SC4905BIMSTR | 制造商:Semtech Corporation 功能描述:IC, VOLTAGE MODE PWM CTRL, 12V, MSOP-10; Input Voltage:48V; Output Voltage:500mV; Output Current:1mA; Supply Voltage Min:0V; Supply Voltage Max:12V; Digital IC Case Style:MSOP; No. of Pins:10; Frequency:1MHz; Control Mode:Voltage ;RoHS Compliant: No |
| SC4905BIMSTRT | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:High Performance Voltage Mode PWM Controller |
| SC4905BMSTR | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:HIGH PERFORMANCE VOLTAGE MODE PWM CONTROLLER |
| SC490AULTRT | 制造商:Semtech Corporation 功能描述:I2C BUCK CONTRO |
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