參數(shù)資料
型號(hào)： TOP249R
廠商： Power Integrations, Inc.
英文描述： Family Extended Power, Design Flexible,Integrated Off-line Switcher
中文描述： 家庭擴(kuò)展的電源，設(shè)計(jì)靈活，集成的離線切換
文件頁(yè)數(shù)： 8/48頁(yè)
文件大?。?/td> 771K
代理商： TOP249R
TOP242-249
8
E
7/01
August 8, 2000
Figure 10. Synchronization Timing Diagram.
PI-2637-060600
Oscillator
(SAW)
DMAX
Enable from
X, L or M Pin (STOP)
Time
second resistor connected between the EXTERNAL CURRENT
LIMIT (X) pin (Y or R package) or MULTI-FUNCTION (M)
pin (P or G package) and the rectified DC high voltage bus, the
current limit is reduced with increasing line voltage, allowing
a true power limiting operation against line variation to be
implemented. When using an RCD clamp, this power limiting
technique reduces maximum clamp voltage at high line. This
allows for higher reflected voltage designs as well as reducing
clamp dissipation.
The leading edge blanking circuit inhibits the current limit
comparator for a short time after the output MOSFET is turned
on. The leading edge blanking time has been set so that, if a
power supply is designed properly, current spikes caused by
primary-side capacitances and secondary-side rectifier reverse
recovery time should not cause premature termination of the
switching pulse.
The current limit is lower for a short period after the leading
edge blanking time as shown in Figure 52. This is due to
dynamic characteristics of the MOSFET. To avoid triggering
the current limit in normal operation, the drain current waveform
should stay within the envelope shown.
Line Under-Voltage Detection (UV)
At power up, UV keeps
TOPSwitch-GX
off until the input line
voltage reaches the under voltage threshold. At power down,
UV prevents auto-restart attempts after the output goes out of
regulation. This eliminates power down glitches caused by the
slow discharge of large input storage capacitor present in
applications such as standby supplies. A single resistor connected
from the LINE-SENSE pin (Y or R package) or MULTI-
FUNCTION pin (P or G package) to the rectified DC high
voltage bus sets UV threshold during power up. Once the power
supply is successfully turned on, the UV threshold is lowered to
40% of the initial UV threshold to allow extended input voltage
operating range (UV low threshold). If the UV low threshold
is reached during operation without the power supply losing
regulation the device will turn off and stay off until UV (high
threshold) has been reached again. If the power supply loses
regulation before reaching the UV low threshold, the device
will enter auto-restart. At the end of each auto-restart cycle (S7),
the UV comparator is enabled. If the UV high threshold is not
exceeded the MOSFET will be disabled during the next cycle (see
figure 8). The UV feature can be disabled independent of OV
feature as shown in Figure 19 and 23.
Line Overvoltage Shutdown (OV)
The same resistor used for UV also sets an overvoltage threshold
which, once exceeded, will force
TOPSwitch-GX
output into
off-state. The ratio of OV and UV thresholds is preset at 4.5 as
can be seen in Figure 11. When the MOSFET is off, the rectified
DC high voltage surge capability is increased to the voltage
rating of the MOSFET (700 V), due to the absence of the
reflected voltage and leakage spikes on the drain. A small
amount of hysteresis is provided on the OV threshold to prevent
noise triggering. The OV feature can be disabled independent
of the UV feature as shown in Figure 18 and 32.
Line Feed Forward with DC
Reduction
The same resistor used for UV and OV also
implements line
voltage feed forward which minimizes output line ripple and
reduces power supply output sensitivity to line transients. This
feed forward operation is illustrated in Figure 7 by the different
values of I
(Y or R package) or I
(P or G Package). Note that
for the same CONTROL pin current, higher line voltage results
in smaller operating duty cycle. As an added feature, the
maximum duty cycle DC
is also reduced from 78% (typical)
at a voltage slightly higher than the UV threshold to 38%
(typical) at the OV threshold (see Figures 7, 11). Limiting
相關(guān)PDF資料
PDF描述
TOP249Y Family Extended Power, Design Flexible,Integrated Off-line Switcher
TOP242-249 Family Extended Power, Design Flexible,Integrated Off-line Switcher
TOP242G Family Extended Power, Design Flexible,Integrated Off-line Switcher
TOP242P Family Extended Power, Design Flexible,Integrated Off-line Switcher
TOP242R Family Extended Power, Design Flexible,Integrated Off-line Switcher
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TOP249R- 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
TOP249RN- 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
TOP249RN-TL 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
TOP249R-TL 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 53 W 85-265 VAC 79 W 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
TOP249Y 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(kāi)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
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