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參數(shù)資料
| 型號(hào)： | FSL136HR |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.41 A SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | MS-001BA, DIP-8 |
| 文件頁(yè)數(shù)： | 13/13頁(yè) |
| 文件大小： | 995K |
| 代理商： | FSL136HR |
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2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSL136HR Rev. 1.0.0
9
FSL136HR
—
Green
Mode
Fairchild
Power
Switch
(FPS)
Functional Description
Startup
At startup, an internal high-voltage current source
supplies the internal bias and charges the external
capacitor (CA) connected with the VCC pin, as illustrated
in Figure 14. When VCC reaches the start voltage of 12V,
the FPS begins switching and the internal high-
voltage current source is disabled. The FPS continues
normal switching operation and the power is provided
from the auxiliary transformer winding unless VCC goes
below the stop voltage of 8V.
Figure 14. Startup Circuit
Oscillator Block
The oscillator frequency is set internally and the FPS
has a random frequency fluctuation function. Fluctuation
of the switching frequency of a switched power supply
can reduce EMI by spreading the energy over a wider
frequency range than the bandwidth measured by the
EMI test equipment. The amount of EMI reduction is
directly related to the range of the frequency variation.
The range of frequency variation is fixed internally;
however, its selection is randomly chosen by the
combination of external feedback voltage and internal
free-running oscillator. This randomly chosen switching
frequency effectively spreads the EMI noise nearby
switching frequency and allows the use of a cost-
effective inductor instead of an AC input line filter to
satisfy the world-wide EMI requirements.
Figure 15. Frequency Fluctuation Waveform
Feedback Control
The FSL136HR employs current-mode control, as
shown in Figure 16. An opto-coupler (such as the
FOD817A) and shunt regulator (such as the KA431) are
typically used to implement the feedback network.
Comparing the feedback voltage with the voltage across
the RSENSE resistor makes it possible to control the
switching duty cycle. When the shunt regulator
reference pin voltage exceeds the internal reference
voltage of 2.5V, the opto-coupler LED current increases,
the feedback voltage VFB is pulled down, and the duty
cycle is reduced. This typically occurs when the input
voltage is increased or the output load is decreased.
Figure 16. Pulse-Width-Modulation Circuit
Leading-Edge Blanking (LEB)
At the instant the internal SenseFET is turned on, the
primary-side capacitance and secondary-side rectifier
diode reverse recovery typically cause a high-current
spike through the SenseFET. Excessive voltage across
the RSENSE resistor leads to incorrect feedback operation
in the current mode PWM control. To counter this effect,
the FPS employs a leading-edge blanking (LEB) circuit
(see the Figure 16). This circuit inhibits the PWM
comparator for a short time (tLEB) after the SenseFET is
turned on.
Protection Circuits
The FPS has several protective functions, such as
overload protection (OLP), over-voltage protection
(OVP), output-short protection (OSP), under-voltage
lockout (UVLO), abnormal over-current protection
(AOCP), and thermal shutdown (TSD). Because these
various protection circuits are fully integrated in the IC
without external components, the reliability is improved
without increasing cost. Once a fault condition occurs,
switching is terminated and the SenseFET remains off.
This causes VCC to fall. When VCC reaches the UVLO
stop voltage VSTOP (8V), the protection is reset and the
internal high-voltage current source charges the VCC
capacitor via the VSTR pin. When VCC reaches the UVLO
start voltage VSTART (12V), the FPS resumes normal
operation. In this manner, the auto-restart can
alternately enable and disable the switching of the
power SenseFET until the fault condition is eliminated.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FSL136HRL | 功能描述:電源開(kāi)關(guān) IC - 配電 Green Mode Fairchild Power Switch (FPS) RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 開(kāi)啟電阻（最大值）: 開(kāi)啟時(shí)間（最大值）: 關(guān)閉時(shí)間（最大值）: 工作電源電壓: 電源電流（最大值）: 最大工作溫度: 安裝風(fēng)格: 封裝 / 箱體: |
| FSL136HRLX | 制造商:Fairchild Semiconductor Corporation 功能描述:Power Switch 3A T/R 制造商:Fairchild Semiconductor Corporation 功能描述:FPS FOR LOW POWER - Tape and Reel 制造商:Fairchild Semiconductor Corporation 功能描述:IC FPS SWITCH PWM/SENSEFET 8LSOP 制造商:Fairchild Semiconductor Corporation 功能描述:Power Switch ICs - Power Distribution Green Mode Fairchild Power Switch (FPS) 制造商:Fairchild Semiconductor Corporation 功能描述:TAPE REEL / Green Mode Fairchild Power Switch |
| FSL136MR | 功能描述:電流型 PWM 控制器 FPS FOR LOW POWER RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| FSL136MRT | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPSa?￠) |
| FSL136MRTWDTU | 功能描述:電源開(kāi)關(guān) IC - 配電 4Ohms 1.35mA 50W RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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