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參數(shù)資料
| 型號： | LNK501P |
| 廠商： | POWER INTEGRATIONS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Energy Efficient, CV/CC Switcher for Very Low Cost Chargers and Adapters |
| 中文描述： | 0.4 A SWITCHING REGULATOR, 46 kHz SWITCHING FREQ-MAX, PDIP7 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 155K |
| 代理商： | LNK501P |
3
F
9/02
LNK501
LinkSwitch
Functional Description
The duty cycle, current limit and operating frequency
relationships with CONTROL pin current are shown in
Figure 4. Figure 5 shows a typical power supply outline
schematic which is used below to describe the
LinkSwitch
operation.
Power Up
During power up, as V
is first applied (Figure 5), the
CONTROL pin capacitor C1 is charged through a switched
high voltage current source connected internally between the
DRAIN and CONTROL pins (see Figure 2). When the
CONTROL pin voltage reaches approximately 5.7 V relative
to the SOURCE pin, the high voltage current source is turned
off, the internal control circuitry is activated and the high
voltage internal MOSFET starts to switch. At this point, the
charge stored on C1 is used to supply the internal consumption
of the chip.
Constant Current (CC) Operation
As the output voltage, and therefore the reflected voltage across
the primary transformer winding ramp up, the feedback
CONTROL current I
increases. As shown in Figure 4, the
internal current limit increases with I
and reaches I
when I
C
is equal to I
. The internal current limit vs. I
characteristic
is designed to provide an approximately constant power supply
output current as the power supply output voltage rises.
Constant Voltage (CV) Operation
When I
exceeds I
, typically 2 mA (Figure 4), the maximum
duty cycle is reduced. At a value of I
that depends on power
supply input voltage, the duty cycle control limits
LinkSwitch
peak current below the internal current limit value. At this point
the power supply transitions from CC to CV operation. With
minimum input voltage in a typical universal input design, this
transition occurs at approximately 30% duty cycle. R1
(Figure 5) is therefore initially selected to conduct a value of I
C
approximately equal to I
when V
is at the desired value
at the minimum power supply input voltage. The final choice
of R1 is made when the rest of the circuit design is complete.
When the duty cycle drops below approximately 4%, the
frequency is reduced, which reduces energy consumption
under light load conditions.
Auto-Restart Operation
When a fault condition, such as an output short circuit or open
loop, prevents flow of an external current into the CONTROL
pin, the capacitor C1 discharges towards 4.7 V. At 4.7 V, auto-
restart is activated, which turns the MOSFET off and puts the
control circuitry in a low current standby mode. In auto-restart,
LinkSwitch
periodically restarts the power supply so that normal
power supply operation can be restored when the fault is
removed.
Figure 4. CONTROL Characteristics.
Figure 5. Power Supply Outline Schematic.
VOUT
VIN
D2
C4
D
S
C
C2
R1
R2
C1
D1
LinkSwitch
PI-2715-100801
PI-2799-112101
Internal Current Limit
CONTROL Current IC
I
DCS
CONTROL Current IC
I
CD1
CONTROL Current IC
Duty Cycle
Frequency
I
LIM
I
DCT
77%
30%
3.8%
f
OSC
f
OSC(low)
Auto-restart
Auto-restart
Auto-restart
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LNK501P_1 | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:2.2W Cell Phone Charger |
| LNK501PN | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 3W 85-265 VAC 4W 230 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 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| LNK520 | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers |
| LNK520G | 功能描述:IC SWIT OCP CV/CC HV 8SMD RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān) 系列:LinkSwitch® 標準包裝: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） 供應商設備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
| LNK520GN | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 3W 85-265 VAC 4W 230 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 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
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