- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄68995 > FSL126HR (FAIRCHILD SEMICONDUCTOR CORP) 1.68 A SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDIP8 PDF資料下載
參數(shù)資料
| 型號(hào)： | FSL126HR |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.68 A SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | MS-001BA, DIP-8 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大小： | 963K |
| 代理商： | FSL126HR |
2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSL126HR Rev. 1.0.0
10
FSL126HR
—
Green
Mode
Fairchild
Power
Switch
(FPS)
Figure 17. Auto-Restart Protection Waveforms
Overload Protection (OLP)
Overload is defined as the load current exceeding a pre-
set level due to an unexpected event. In this situation,
the protection circuit should be activated to protect the
SMPS. However, even when the SMPS is operating
normally, the overload protection (OLP) circuit can be
activated during the load transition or startup. To avoid
this undesired operation, the OLP circuit is designed to
be activated after a specified time to determine whether
it is a transient situation or a true overload situation.
In conjunction with the IPK current limit pin (if used), the
current-mode feedback path limits the current in the
SenseFET when the maximum PWM duty cycle is
attained. If the output consumes more than this
maximum power, the output voltage (VO) decreases
below its rating voltage. This reduces the current
through the opto-coupler LED, which also reduces the
opto-coupler transistor current, thus increasing the
feedback voltage (VFB). If VFB exceeds 2.4V, the
feedback input diode is blocked and the 5A current
source (IDELAY) starts to charge CFB slowly up to VCC. In
this condition, VFB increases until it reaches 6V, when
the switching operation is terminated, as shown in
Figure 18. The shutdown delay is the time required to
charge CFB from 2.4V to 6V with 5A current source.
Figure 18. Overload Protection (OLP)
Abnormal Over-Current Protection (AOCP)
When the secondary rectifier diodes or the transformer
pin are shorted, a steep current with extremely high di/dt
can flow through the SenseFET during the LEB time.
Even though the FPS has OLP (Overload Protection), it
is not enough to protect the FPS in that abnormal case,
since severe current stress is imposed on the
SenseFET until OLP triggers. The FPS includes the
internal AOCP (Abnormal Over-Current Protection)
circuit shown in Figure 19. When the gate turn-on signal
is applied to the power SenseFET, the AOCP block is
enabled and monitors the current through the sensing
resistor. The voltage across the resistor is compared
with a preset AOCP level. If the sensing resistor voltage
is greater than the AOCP level, the set signal is applied
to the latch, resulting in the shutdown of the SMPS.
Figure 19. Abnormal Over-Current Protection
Thermal Shutdown (TSD)
The SenseFET and the control IC are integrated,
making it easier to detect the temperature of the
SenseFET.
When
the
temperature
exceeds
approximately 137°C, thermal shutdown is activated.
Over-Voltage Protection (OVP)
In the event of a malfunction in the secondary-side
feedback circuit or an open feedback loop caused by a
soldering defect, the current through the opto-coupler
transistor becomes almost zero. Then, VFB climbs up in
a similar manner to the overload situation, forcing the
preset maximum current to be supplied to the SMPS
until the overload protection is activated. Because
excess energy is provided to the output, the output
voltage may exceed the rated voltage before the
overload protection is activated, resulting in the
breakdown of the devices in the secondary side. To
prevent this situation, an over-voltage protection (OVP)
circuit is employed. In general, VCC is proportional to the
output voltage and the FPS uses VCC instead of directly
monitoring the output voltage. If VCC exceeds 24V, OVP
circuit is activated, resulting in termination of the
switching operation. To avoid undesired activation of
OVP during normal operation, VCC should be designed
to be below 24V.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FSL126MR | 8 A SWITCHING CONTROLLER, 73 kHz SWITCHING FREQ-MAX, PDIP8 |
| FSL136HR | 2.41 A SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDIP8 |
| FSL136MR | SWITCHING CONTROLLER, PDIP8 |
| FSQ0565RQ | 3.36 A SWITCHING CONTROLLER, 75.8 kHz SWITCHING FREQ-MAX, ZFM6 |
| FSQ0565RS | 2.5 A SWITCHING CONTROLLER, 75.8 kHz SWITCHING FREQ-MAX, ZFM6 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FSL126MR | 功能描述:電流型 PWM 控制器 FPS FOR LOW POWER RoHS:否 制造商:Texas Instruments 開關(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 |
| FSL126MRT | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPSa?￠) |
| FSL126MRTWDTU | 功能描述:電源開關(guān) IC - 配電 6.2Ohms 1mA 50W RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(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 |
| FSL127H | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch |
| FSL127HNY | 功能描述:電源開關(guān) IC - POE / LAN Green Mode Power Switch RoHS:否 制造商:Fairchild Semiconductor 開關(guān)數(shù)量:Single 開關(guān)配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時(shí)間（最大值）:13 ns 關(guān)閉時(shí)間（最大值）:20 ns 切換電壓（最大）: 工作電源電壓:8 V to 26 V 最大工作溫度:+ 125 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-220F-6 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。