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參數(shù)資料
| 型號(hào)： | 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)： | 12/16頁 |
| 文件大?。?/td> | 861K |
| 代理商： | LNK302GNTL |
5
LNK302/304-306
G
3/05
Figure 6. Recommended Printed Circuit Layout for LinkSwitch-TN in a Buck Converter Conguration.
cycles are skipped. To provide overload protection if no cycles
are skipped during a 50 ms period, LinkSwitch-TN will enter
auto-restart (LNK304-306), limiting the average output power
to approximately 6% of the maximum overload power. Due to
trackingerrorsbetweentheoutputvoltageandthevoltageacross
C3 at light load or no load, a small pre-load may be required
(R4). For the design in Figure 5, if regulation to zero load is
required, then this value should be reduced to 2.4 k.
Key Application Considerations
LinkSwitch-TN
Design Considerations
Output Current Table
Data sheet maximum output current table (Table 1) represents
the maximum practical continuous output current for both
mostlydiscontinuousconductionmode(MDCM)andcontinuous
conductionmode(CCM)ofoperationthatcanbedeliveredfrom
a given LinkSwitch-TN device under the following assumed
conditions:
1) Buck converter topology.
2) The minimum DC input voltage is ≥70 V. The value of
input capacitance should be large enough to meet this
criterion.
3) For CCM operation a KRP* of 0.4.
4) Output voltage of 12 VDC.
5) Efciency of 75%.
6) A catch/freewheeling diode with t
rr ≤75 ns is used for
MDCM operation and for CCM operation, a diode with
t
rr ≤35 ns is used.
7) The part is board mounted with SOURCE pins soldered
to a sufcient area of copper to keep the SOURCE pin
temperature at or below 100 °C.
*KRP is the ratio of ripple to peak inductor current.
LinkSwitch-TN
Selection and Selection Between
MDCM and CCM Operation
SelecttheLinkSwitch-TNdevice,freewheelingdiodeandoutput
inductor that gives the lowest overall cost. In general, MDCM
provides the lowest cost and highest efciency converter. CCM
designs require a larger inductor and ultra-fast (t
rr ≤35 ns)
freewheeling diode in all cases. It is lower cost to use a larger
LinkSwitch-TN
inMDCMthanasmallerLinkSwitch-TNinCCM
because of the additional external component costs of a CCM
design. However, if the highest output current is required, CCM
should be employed following the guidelines below.
Topology Options
LinkSwitch-TN
can be used in all common topologies, with or
withoutanoptocouplerandreferencetoimproveoutputvoltage
tolerance and regulation. Table 2 provide a summary of these
congurations. For more information see the Application
Note – LinkSwitch-TN Design Guide.
Component Selection
Referring to Figure 5, the following considerations may be
helpful in selecting components for a LinkSwitch-TN design.
Freewheeling Diode D1
Diode D1 should be an ultra-fast type. For MDCM, reverse
recovery time t
rr ≤75 ns should be used at a temperature of
70°Corbelow. Slowerdiodesarenotacceptable,ascontinuous
mode operation will always occur during startup, causing high
leading edge current spikes, terminating the switching cycle
prematurely,andpreventingtheoutputfromreachingregulation.
If the ambient temperature is above 70 °C then a diode with
t
rr ≤35 ns should be used.
For CCM an ultra-fast diode with reverse recovery time
t
rr ≤35 ns should be used. A slower diode may cause excessive
+
PI-3750-083004
C2
L1
L2
R1
R3
RF1
D1
D4
D2
D1
C1
C3
C5
C4
Optimize hatched copper areas (
) for heatsinking and EMI.
D
S
FB
BP
S
LinkSwitch-TN
AC
INPUT
DC
OUTPUT
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| LNK302GN-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)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(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 |
| LNK302G-TL | 功能描述:IC OFFLINE SWIT OCP 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®-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: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(guān)轉(zhuǎn)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(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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