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參數(shù)資料
| 型號(hào)： | KA7525BD |
| 廠(chǎng)商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Tantalum Conformal-Coated Capacitor; Capacitance: 1uF; Voltage: 25V; Packaging: Tape & Reel |
| 中文描述： | 0.5 A POWER FACTOR CONTROLLER, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁(yè)數(shù)： | 11/18頁(yè) |
| 文件大?。?/td> | 480K |
| 代理商： | KA7525BD |
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KA7525B
11
The equation below describes the relationship between multiplier output and inputs.
Vmo = K
×
Vm1
×
(Vm2-Vref)
K : Multiplier gain
Vm1: Voltage at Pin 3
Vm2: Error amp output voltage
Vmo: Multiplier output voltage
Current Sense Comparator
The current sense comparator RS latch configuration used ensures that only a single pulse appears at the drive output during a
given cycle. MOSFET drain current is converted to voltage using an external sense resistor in series with the external power
MOSFET. When sense voltage exceeds the threshold set by the multiplier output, the current sense comparator terminates the
gate drive to the MOSFET and resets the PWM latch. The latch insures that the output remains in a low state after the MOS-
FET drain current falls back to zero.
The peak inductor current under normal operating conditions is controlled by the multiplier output, Vmo.
Abnormal operating conditions occur during preconverter start-up at extremely high line or if output voltage sensing is lost.
Under these conditions, the multiplier output and current sense threshold will be internally clamped to 1.24V. Therefore, the
maximum peak switch current is limited to:
Ipk(max) = 1.24V / Rsense
Internal R,C filter has been included to attenuate any high frequency noise that may be present on the current waveform. These
circuit block eliminate the need for an external RC filter otherwise required for proper operation of the circuit.
+
-
+
-
+
+
Vref
2
3
1.24V
Current Sense
Error Amp
.
Vm2
Vmo
Vm1
INV
MULT
EA OUT
+
-
1
Figure 3.1 Multiplier Block
4
CS
LEB Delay(KA7525)
4
cs
1.24V
Multiplier
Output
Rsense
eliminated
Low Pass Filter can be
Figure 4.1 Current Sense Circuit
+
-
RC filter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KA7525BDTF | 功能描述:功率因數(shù)校正 IC RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| KA7526 | 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| KA7526D | 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| KA7526DTF | 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| KA75270 | 制造商:FAIRCHILD 制造商全稱(chēng):Fairchild Semiconductor 功能描述:Voltage Detector |
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