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參數(shù)資料
| 型號(hào)： | KA7526 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Tantalum Conformal-Coated Capacitor; Capacitance: 1uF; Voltage: 25V; Case Size: 3.2x1.2 mm; Packaging: Tape & Reel |
| 中文描述： | 0.5 A POWER FACTOR CONTROLLER, 20 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 12/22頁 |
| 文件大小： | 250K |
| 代理商： | KA7526 |
KA7526
12
Current Sense Comparator
The current sense comparator adopt the RS latch configuration to ensure 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 termi-
nates the gate drive to the MOSFET and resets the PWM latch. The latch insures that the output remains in a low state after the
MOSFET 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 as output voltage sensing is lost.
Under these conditions, the multiplier output and current sense threshold will be internally clamped to 1.65V. Therefore, the
maximum peak switch current is limited to:
Ipk(max) = 1.65V / Rsense
An internal R/C filter has been included to attenuate any high frequency noise that may be present on the current waveform.
This circuit block eliminates the need for an external R/C filter otherwise required for proper operation of the circuit.
+
-
+
-
+
+
Vref
2
3
1.65V
Current Sense
Error Amp
.
Vm2
+
Vmo
Vm1
INV
MULT
EA OUT
-
1
Fig.3.1 Multiplier Block
4
CS
4
cs
1.65V
Multiplier
Output
Rsense
can be eliminated
External R/C Filter
Fig. 4.1 Current Sense Circuit
+
-
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相關(guān)代理商/技術(shù)參數(shù) |
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| KA7526D | 功能描述:功率因數(shù)校正 IC PFC Controller RoHS:否 制造商:Fairchild Semiconductor 開關(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 |
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| KA75270 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Voltage Detector |
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| KA75270MTF | 功能描述:監(jiān)控電路 Voltage Detector 2.7V RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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