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參數(shù)資料
| 型號(hào)： | LNK306GTL |
| 廠商： | POWER INTEGRATIONS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 1.4 A SWITCHING REGULATOR, 70 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, SMD-8 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 861K |
| 代理商： | LNK306GTL |
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3
LNK302/304-306
G
3/05
Pin Functional Description
DRAIN (D) Pin:
Power MOSFET drain connection. Provides internal operating
current for both start-up and steady-state operation.
BYPASS (BP) Pin:
Connection point for a 0.1 F external bypass capacitor for the
internally generated 5.8 V supply.
FEEDBACK (FB) Pin:
During normal operation, switching of the power MOSFET is
controlled by this pin. MOSFET switching is terminated when
a current greater than 49 A is delivered into this pin.
SOURCE (S) Pin:
This pin is the power MOSFET source connection. It is also the
ground reference for the BYPASS and FEEDBACK pins.
LinkSwitch-TN
Functional
Description
LinkSwitch-TN
combinesahighvoltagepowerMOSFETswitch
withapowersupplycontrollerinonedevice.Unlikeconventional
PWM(pulsewidthmodulator)controllers,LinkSwitch-TNuses
a simple ON/OFF control to regulate the output voltage. The
LinkSwitch-TN
controller consists of an oscillator, feedback
(sense and logic) circuit, 5.8 V regulator, BYPASS pin under-
voltagecircuit,over-temperatureprotection,frequencyjittering,
current limit circuit, leading edge blanking and a 700 V power
MOSFET.TheLinkSwitch-TNincorporatesadditionalcircuitry
for auto-restart.
Oscillator
The typical oscillator frequency is internally set to an average
of 66 kHz. Two signals are generated from the oscillator: the
maximum duty cycle signal (DC
MAX) and the clock signal that
indicates the beginning of each cycle.
The LinkSwitch-TN oscillator incorporates circuitry that
introduces a small amount of frequency jitter, typically 4 kHz
peak-to-peak, to minimize EMI emission. The modulation rate
of the frequency jitter is set to 1 kHz to optimize EMI reduction
for both average and quasi-peak emissions. The frequency
jitter should be measured with the oscilloscope triggered at
the falling edge of the DRAIN waveform. The waveform in
Figure 4 illustrates the frequency jitter of the LinkSwitch-TN.
Feedback Input Circuit
The feedback input circuit at the FB pin consists of a low
impedancesourcefolloweroutputsetat1.65V.Whenthecurrent
deliveredintothispinexceeds49A,alowlogiclevel(disable)
is generated at the output of the feedback circuit. This output
is sampled at the beginning of each cycle on the rising edge of
the clock signal. If high, the power MOSFET is turned on for
that cycle (enabled), otherwise the power MOSFETremains off
(disabled). Since the sampling is done only at the beginning of
each cycle, subsequent changes in the FB pin voltage or current
during the remainder of the cycle are ignored.
5.8 V Regulator and 6.3 V Shunt Voltage Clamp
The 5.8 V regulator charges the bypass capacitor connected to
the BYPASS pin to 5.8 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 for the LinkSwitch-TN.
When the MOSFET is on, the LinkSwitch-TN runs off of the
energy stored in the bypass capacitor. Extremely low power
consumption of the internal circuitry allows the LinkSwitch-TN
tooperatecontinuouslyfromthecurrentdrawnfromtheDRAIN
pin. A bypass capacitor value of 0.1 F is sufcient for both
high frequency decoupling and energy storage.
In addition, there is a 6.3 V shunt regulator clamping the
BYPASS pin at 6.3 V when current is provided to the BYPASS
pin through an external resistor. This facilitates powering of
LinkSwitch-TN
externally through a bias winding to decrease
the no-load consumption to about 50 mW.
BYPASS Pin Under-Voltage
The BYPASS pin under-voltage circuitry disables the power
MOSFET when the BYPASS pin voltage drops below 4.85 V.
Once the BYPASS pin voltage drops below 4.85 V, it must rise
back to 5.8 V to enable (turn-on) the power MOSFET.
Over-Temperature Protection
The thermal shutdown circuitry senses the die temperature.
The threshold is set at 142 °C typical with a 75 °C hysteresis.
Whenthedietemperaturerisesabovethisthreshold(142 °C)the
power MOSFET is disabled and remains disabled until the die
temperature falls by 75 °C, at which point it is re-enabled.
Current Limit
ThecurrentlimitcircuitsensesthecurrentinthepowerMOSFET.
When this current exceeds the internal threshold (I
LIMIT), the
PI-3491-111903
FB
D
S
BP
S
P Package (DIP-8B)
G Package (SMD-8B)
8
5
7
1
4
2
3
Figure 3. Pin Conguration.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LNK306G-TL | 功能描述:IC OFFLINE SWIT OCP 8SMD RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線(xiàn)開(kāi)關(guān) 系列:LinkSwitch®-TN 標(biāo)準(zhǔn)包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱(chēng):FSL206MRBNFSDKR |
| LNK306P | 功能描述:IC OFFLINE SWIT OCP 8DIP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線(xiàn)開(kāi)關(guān) 系列:LinkSwitch®-TN 標(biāo)準(zhǔn)包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱(chēng):FSL206MRBNFSDKR |
| LNK306P/G | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Lowest Component Count. Energy Efficient Off-Line Switcher IC |
| LNK306P/G/D | 制造商:FERYSTER 制造商全稱(chēng):FERYSTER Inductive Components Manufacturer 功能描述:Lowest Component Count, Energy-Effi cient Off-Line Switcher IC |
| LNK306PN | 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 225mA MDCM 360mA CCM 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(kāi)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 |
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