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參數(shù)資料
| 型號(hào)： | TOP242R-TL |
| 英文描述： | SMPS Controller |
| 中文描述： | 開關(guān)電源控制器 |
| 文件頁數(shù)： | 30/52頁 |
| 文件大小： | 457K |
| 代理商： | TOP242R-TL |
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TOP242-250
30
H
9/02
General Information & Table of Contents
most applications, the tighter current limit tolerance, higher
Product Selector Guide 1
Data Sheets 2
Application Notes 3
Design Ideas 4
EN55022B (QP)
Design Tools 5
Figure 46a. TOPSwitch-II Full Range EMI Scan
(100 kHz, no jitter).
Package Information 7
TOPSwitch-GX(with jitter)
DPA-SwitchDC-DC Seminar 8
LinkSwitch & TinySwitch-IIAC-DC Seminar 9
20
TOPSwitch-GXAC-DC Seminar 10
0
66 kHz will reduce snubber loss resulting in better efficiency.
Also, in applications where transformer size is not a concern, use
of the 66 kHz option will provide lower EMI and higher
efficiency. Note that the second harmonic of 66 kHz is still
below 150 kHz, above which the conducted EMI specifications
get much tighter.
Figure 46b. TOPSwitch-GX Full Range EMI Scan (132 kHz,
with jitter) with Identical Circuitry and
Conditions.
A high V
is required to take full advantage of the wider DC
of
TOPSwitch
-
GX.
An RCD clamp provides tighter clamp
voltage tolerance than a Zener clamp and allows a V
as high as
150 V. RCD clamp dissipation can be minimized by reducing
the external current limit as a function of input line voltage (see
Figure 21 and 35). The RCD clamp is more cost effective than
the Zener clamp but requires more careful design (see quick
design checklist).
Output Diode
The output diode is selected for peak inverse voltage, output
current, and thermal conditions in the application (including
heatsinking, air circulation, etc.). The higher DC
of
TOPSwitch
-
GX
along with an appropriate transformer turns ratio
can allow the use of a 60 V Schoktty diode for higher efficiency
on output voltages as high as 15 V (see Figure 41. A 12 V, 30 W
design using a 60 V Schottky for the output diode).
Bias Winding Capacitor
Due to the low frequency operation at no-load a 1
μ
F bias
winding capacitor is recommended.
Soft-Start
Generally a power supply experiences maximum stress at
start-up before the feedback loop achieves regulation. For a
period of 10 ms the on-chip soft-start linearly increases the duty
cycle from zero to the default DC
at turn on. In addition, the
primary current limit increases from 85% to 100% over the same
period. This causes the output voltage to rise in an orderly
manner allowing time for the feedback loop to take control of the
duty cycle. This reduces the stress on the
TOPSwitch-GX
MOSFET, clamp circuit and output diode(s), and helps prevent
transformer saturation during start-up. Also soft-start limits the
amount of output voltage overshoot, and in many applications
eliminates the need for a soft-finish capacitor.
EMI
The frequency jitter feature modulates the switching frequency
over a narrow band as a means to reduce conducted EMI peaks
associated with the harmonics of the fundamental switching
frequency. This is particularly beneficial for average detection
mode. As can be seen in Figure 46, the benefits of jitter increase
with the order of the switching harmonic due to an increase in
frequency deviation.
The FREQUENCY pin of
TOPSwitch
-
GX
offers a switching
frequency option of 132 kHz or 66 kHz. In applications that
require heavy snubbers on the drain node for reducing high
frequency radiated noise (for example, video noise sensitive
applications such as VCR, DVD, monitor, TV, etc.), operating at
For 10 W or below, it is possible to use a simple inductor in
place of a more costly AC input common mode choke to meet
worldwide conducted EMI limits.
Transformer Design
It is recommended that the transformer be designed for
maximum operating flux density of 3000 Gauss and a peak flux
density of 4200 Gauss at maximum current limit. The turns ratio
should be chosen for a reflected voltage (V
) no greater than
135 V when using a Zener clamp, or 150 V (max) when using
RCD clamp with current limit reduction with line voltage
(overload protection).
For designs where operating current is significantly lower than
the default current limit, it is recommended to use an externally
set current limit close to the operating peak current to reduce
peak flux density and peak power (see Figures 20 and 34). In
EN55022B (QP)
EN55022B (AV)
-20
-10
-10
30
40
70
80
0.15
1
10
30
Frequency (MHz)
μ
V
-20
-10
0
-10
20
30
40
50
60
70
80
0.15
1
Frequency (MHz)
A
μ
V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TOP242Y | 功能描述:IC OFFLINE SWIT UVLO HV TO220 RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān) 系列:TOPSwitch®-GX 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 |
| TOP242Y- | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP242Y/F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Up to 290 W Extended power. design flexible. |
| TOP242YN | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 14W 85-265 VAC 22 W230 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(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| TOP242YN- | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
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