參數(shù)資料
型號(hào)： TNY253P
廠(chǎng)商： POWER INTEGRATIONS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： TinySwitch Family Energy Efficient, Low Power Off-line Switchers
中文描述： 0.4 A SWITCHING REGULATOR, 48 kHz SWITCHING FREQ-MAX, PDIP8
封裝： 0.300 INCH, PLASTIC, DIP-8
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 498K
代理商： TNY253P
C
7/01
TNY253/254/255
9
Figure 13. Recommended PC Layout for the TinySwitch.
accommodated by rating the output diode to handle the short
circuit current. The short circuit current can be minimized by
choosing the smallest (lowest current limit)
TinySwitch
for the
required power.
Layout
Single Point Grounding
Use a single point ground connection at the SOURCE pin for the
BYPASS pin capacitor and the Input Filter Capacitor (see
Figure 13).
Primary Loop Area
The area of the primary loop that connects the input filter
capacitor, transformer primary and
TinySwitch
together, should
be kept as small as possible.
Primary Clamp Circuit
A clamp or snubber circuit is used to minimize peak voltage and
ringing on the DRAIN pin at turn-off. This can be achieved by
using an RC snubber for less than 3 W or an RCD clamp as
shown in Figure 13 for higher power. A Zener and diode clamp
across the primary or a single 550V Zener clamp from DRAIN
to SOURCE can also be used. In all cases care should be taken
to minimize the circuit path from the snubber/clamp components
to the transformer and
TinySwitch
.
Thermal Considerations
Copper underneath the
TinySwitch
acts not only as a single point
ground, but also as a heatsink. The hatched area shown in
Figure13 should be maximized for good heat-sinking of
TinySwitch
and output diode.
Y-Capacitor
The placement of the Y-capacitor should be directly from the
primary single point ground to the common/return terminal on
the secondary side. Such placement will maximize the EMI
benefit of the Y-capacitor.
Optocoupler
It is important to maintain the minimum circuit path from the
optocoupler transistor to the
TinySwitch
ENABLE and SOURCE
pins to minimize noise coupling.
Output Diode
For best performance, the area of the loop connecting the
secondary winding, the Output Diode and the Output Filter
Capacitor, should be minimized. See Figure13 for optimized
layout. In addition, sufficient copper area should be provided
at the anode and cathode terminals of the diode to adequately
heatsink the diode under output short circuit conditions.
Input and Output Filter Capacitors
There are constrictions in the traces connected to the input and
output filter capacitors. These constrictions are present for two
reasons. The first is to force all the high frequency currents to
flow through the capacitor (if the trace were wide then it could
flow around the capacitor). Secondly, the constrictions minimize
the heat transferred from the
TinySwitch
to the input filter
capacitor and from the secondary diode to the output filter
capacitor. The common/return (the negative output terminal in
Figure13) terminal of the output filter capacitor should be
connected with a short, low resistance path to the secondary
winding. In addition, the common/return output connection
should be taken directly from the secondary winding pin and
not from the Y-capacitor connection point.
TOP VIEW
PI-2176-071398
Y1-
Capacitor
Opto-
coupler
C
BP
D
EN
BP
TinySwitch
+
–
HV
+
–
DC
Out
Input Filter Capacitor
Output Filter Capacitor
Safety Spacing
Transformer
Maximize hatched copper
areas ( ) for optimum
heat sinking
S
S
PRI
SEC
相關(guān)PDF資料
PDF描述
TNY254 TinySwitch Family Energy Efficient, Low Power Off-line Switchers
TNY254G TinySwitch Family Energy Efficient, Low Power Off-line Switchers
TNY254P TinySwitch Family Energy Efficient, Low Power Off-line Switchers
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TNY253PN 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 2W 85-265 VAC 4W 100/115/230 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(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
TNY254 制造商:POWERINT 制造商全稱(chēng):Power Integrations, Inc. 功能描述:TinySwitch Family Energy Efficient, Low Power Off-line Switchers
TNY254G 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 4W 85-265 VAC 5W 100/115/230 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(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
TNY254GN 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 4W 85-265 VAC 5W 100/115/230 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(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
TNY254GN-TL 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 4W 85-265 VAC 5W 100/115/230 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(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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