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參數(shù)資料
| 型號： | LNK302GNTL |
| 廠商： | POWER INTEGRATIONS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.2 A SWITCHING REGULATOR, 70 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, SMD-8 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 861K |
| 代理商： | LNK302GNTL |
7
LNK302/304-306
G
3/05
Table 2 (cont). Common Circuit Congurations Using LinkSwitch-TN.
TOPOLOGY
BASIC CIRCUIT SCHEMATIC
KEY FEATURES
Low-Side
Buck Boost –
Optocoupler
Feedback
1. Output referenced to input
2. Positive output (V
O) with respect to +VIN
3. Step up/down – V
O > VIN or VO < VIN
4. Optocoupler feedback
- Accuracy only limited by reference
choice
- Low cost non-safety rated opto
- No pre-load required
5. Fail-safe – output is not subjected to input
voltage if the internal MOSFET fails
leading edge current spikes, terminating the switching cycle
prematurely and preventing full power delivery.
Fast and slow diodes should never be used as the large reverse
recovery currents can cause excessive power dissipation in the
diode and/or exceed the maximum drain current specication
of LinkSwitch-TN.
Feedback Diode D2
Diode D2 can be a low-cost slow diode such as the 1N400X
series, however it should be specied as a glass passivated type
to guarantee a specied reverse recovery time. To a rst order,
the forward drops of D1 and D2 should match.
Inductor L1
Choose any standard off-the-shelf inductor that meets the
design requirements.A“drum” or “dog bone” “I” core inductor
is recommended with a single ferrite element due to to its
low cost and very low audible noise properties. The typical
inductance value and RMS current rating can be obtained from
the LinkSwitch-TN design spreadsheet available within the
PI Expert
design suite from Power Integrations. Choose L1
greater than or equal to the typical calculated inductance with
RMS current rating greater than or equal to calculated RMS
inductor current.
Capacitor C2
The primary function of capacitor C2 is to smooth the inductor
current. The actual output ripple voltage is a function of this
capacitors ESR. To a rst order, the ESR of this capacitor
should not exceed the rated ripple voltage divided by the typical
current limit of the chosen LinkSwitch-TN.
Feedback Resistors R1 and R3
The values of the resistors in the resistor divider formed by
R1 and R3 are selected to maintain 1.65 V at the FB pin. It is
recommended that R3 be chosen as a standard 1% resistor of
2k. Thisensuresgoodnoiseimmunitybybiasingthefeedback
network with a current of approximately 0.8 mA.
Feedback Capacitor C3
Capacitor C3 can be a low cost general purpose capacitor. It
provides a “sample and hold” function, charging to the output
voltage during the off time of LinkSwitch-TN. Its value should
be 10 F to 22 F; smaller values cause poorer regulation at
light load conditions.
Pre-load Resistor R4
In high-side, direct feedback designs where the minimum load
is <3 mA, a pre-load resistor is required to maintain output
regulation. This ensures sufcient inductor energy to pull the
inductor side of the feedback capacitor C3 to input return via
D2. The value of R4 should be selected to give a minimum
output load of 3 mA.
In designs with an optocoupler the Zener or reference bias
current provides a 1 mA to 2 mA minimum load, preventing
“pulse bunching” and increased output ripple at zero load.
LinkSwitch-TN
Layout Considerations
In the buck or buck-boost converter conguration, since the
SOURCEpinsinLinkSwitch-TNareswitchingnodes,thecopper
area connected to SOURCE should be minimized to minimize
EMI within the thermal constraints of the design.
In the boost conguration, since the SOURCE pins are tied
to DC return, the copper area connected to SOURCE can be
maximized to improve heatsinking.
The loop formed between the LinkSwitch-TN, inductor (L1),
freewheeling diode (D1), and output capacitor (C2) should
be kept as small as possible. The BYPASS pin capacitor
C1 (Figure 6) should be located physically close to the
SOURCE (S) and BYPASS (BP) pins. To minimize direct
coupling from switching nodes, the LinkSwitch-TN should be
placed away from AC input lines. It may be advantageous to
place capacitors C4 and C5 in-between LinkSwitch-TN and the
AC input. The second rectier diode D4 is optional, but may
LinkSwitch-TN
PI-3756-111903
+
BP
FB
D
S
VO
VIN
+
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LNK302GN-TL | 功能描述:交流/直流開關轉換器 63mA MDCM 80mA 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 開關頻率: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 |
| LNK302G-TL | 功能描述:IC OFFLINE SWIT OCP 8SMD RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉換器，離線開關 系列:LinkSwitch®-TN 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 |
| LNK302P | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:Lowest Component Count, Energy Efficient Off-Line Switcher IC |
| LNK302P/G/D | 制造商:FERYSTER 制造商全稱:FERYSTER Inductive Components Manufacturer 功能描述:Lowest Component Count, Energy-Effi cient Off-Line Switcher IC |
| LNK302PN | 功能描述:交流/直流開關轉換器 63mA MDCM 80mA 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 開關頻率: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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