- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44716 > LNK626DG-TL (POWER INTEGRATIONS INC) SPECIALTY ANALOG CIRCUIT, PDSO7 PDF資料下載
參數(shù)資料
| 型號： | LNK626DG-TL |
| 廠商： | POWER INTEGRATIONS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO7 |
| 封裝： | GREEN, PLASTIC, MS-012, SOP-8/7 |
| 文件頁數(shù)： | 12/18頁 |
| 文件大?。?/td> | 535K |
| 代理商： | LNK626DG-TL |
Rev. E 09/09
3
LNK623-626
www.powerint.com
LinkSwitch-CV Functional Description
The LinkSwitch-CV combines a high voltage power MOSFET
switch with a power supply controller in one device. Similar to
the LinkSwitch-LP and TinySwitch-III it uses ON/OFF control to
regulate the output voltage. The LinkSwitch-CV controller
consists of an oscillator, feedback (sense and logic) circuit, 6 V
regulator, over-temperature protection, frequency jittering,
current limit circuit, leading-edge blanking, and ON/OFF state
machine for CV control.
Constant Voltage (CV) Operation
The controller regulates the feedback pin voltage to remain at
V
FBth using an ON/OFF state-machine.
The feedback pin
voltage is sampled 2.5 μs after the turn-off of the high voltage
switch. At light loads the current limit is also reduced to
decrease the transformer ux density.
Auto-Restart and Open-Loop Protection
In the event of a fault condition such as an output short or an
open loop condition the LinkSwitch-CV enters into an
appropriate protection mode as described below.
In the event the feedback pin voltage during the Flyback period
falls below V
FBth-0.3 V before the feedback pin sampling delay
(~2.5 μs) for a duration in excess of 200 ms (auto-restart on-
time (t
AR-ON) the converter enters into Auto-restart, wherein the
power MOSFET is disabled for 2.5 seconds (~8% Auto-Restart
duty cycle). The auto-restart alternately enables and disables
the switching of the power MOSFET until the fault condition is
removed.
In addition to the conditions for auto-restart described above, if
the sensed feedback pin current during the Forward period of
the conduction cycle (switch “on” time) falls below 120 μA, the
converter annunciates this as an open-loop condition (top
resistor in potential divider is open or missing) and reduces the
Auto-restart time from 200 ms to approximately 6 clock cycles
(90 μs), whilst keeping the disable period of 2.5 seconds. This
effectively reduces the Auto-Restart duty cycle to less than 0.01%.
Over-Temperature Protection
The thermal shutdown circuitry senses the die temperature. The
threshold is set at 142 °C typical with a 60 °C hysteresis. When
the die temperature rises above this threshold (142 °C) the
power MOSFET is disabled and remains disabled until the die
temperature falls by 60 °C, at which point the MOSFET is
re-enabled.
Current Limit
The current limit circuit senses the current in the power
MOSFET. When this current exceeds the internal threshold
(I
LIMIT), the power MOSFET is turned off for the remainder of that
cycle. The leading edge blanking circuit inhibits the current limit
comparator for a short time (t
LEB) after the power MOSFET is
turned on. This leading edge blanking time has been set so that
current spikes caused by capacitance and rectier reverse
recovery time will not cause premature termination of the
MOSFET conduction.
6.0 V Regulator
The 6 V regulator charges the bypass capacitor connected to the
BYPASS pin to 6 V by drawing a current from the voltage on the
DRAIN, whenever the MOSFET is off. The BYPASS pin is the
internal supply voltage node. When the MOSFET is on, the
device runs off of the energy stored in the bypass capacitor.
Extremely low power consumption of the internal circuitry allows
the LinkSwitch-CV to operate continuously from the current
drawn from the DRAIN pin. A bypass capacitor value of 1 μF is
sufcient for both high frequency decoupling and energy storage.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LNK625PG-TL | SPECIALTY ANALOG CIRCUIT, PDIP7 |
| LNK626DG | SPECIALTY ANALOG CIRCUIT, PDSO7 |
| LOG102AIDRG4 | LOG OR ANTILOG AMPLIFIER, 1.4 MHz BAND WIDTH, PDSO14 |
| LOG102AIDR | LOG OR ANTILOG AMPLIFIER, 1.4 MHz BAND WIDTH, PDSO14 |
| LOG102AIDG4 | LOG OR ANTILOG AMPLIFIER, 1.4 MHz BAND WIDTH, PDSO14 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LNK626PG | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 8.5 W (85-265 VAC) RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| LNK632DG | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 3.1 W (85-265 VAC) RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| LNK632DG-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 3.1 W (85-265 VAC) RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| LNK6663E | 功能描述:初級與次級側(cè) PWM 控制器 Off-Line Switcher PSR, LinkSwitch - HP RoHS:否 制造商:ON Semiconductor 輸出端數(shù)量:1 開關(guān)頻率:250 KHz 工作電源電壓:- 0.3 V to + 28 V 最大工作溫度:+ 85 C 最小工作溫度:- 5 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Reel |
| LNK6663V | 功能描述:初級與次級側(cè) PWM 控制器 Off-Line Switcher IC PSR LinkSwitch HP RoHS:否 制造商:ON Semiconductor 輸出端數(shù)量:1 開關(guān)頻率:250 KHz 工作電源電壓:- 0.3 V to + 28 V 最大工作溫度:+ 85 C 最小工作溫度:- 5 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。