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| 型號： | TOP250R |
| 英文描述： | Up to 290 W Extended power. design flexible. |
| 中文描述： | 高達(dá)290瓦的擴(kuò)展能力。設(shè)計靈活。 |
| 文件頁數(shù)： | 11/52頁 |
| 文件大小： | 468K |
| 代理商： | TOP250R |
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TOP242-250
11
K
9/03
with 30
μ
A hysteresis) and OV triggers at I
(+225
μ
A
typical with 8
μ
A hysteresis). Between the UV and OV
thresholds, the output is enabled. For line feed-forward with
DC
reduction, the vertical axis represents the magnitude of
the DC
. Line feed-forward with DC
MAX
reduction lowers
maximum duty cycle from 78% at I
L(DC)
μ
A typical) to
38% at I
OV
(+225
μ
A).
EXTERNAL CURRENT LIMIT (X) Pin Operation
(Y, R and F Packages)
When current is drawn out of the EXTERNAL CURRENT
LIMIT pin, it works as a voltage source of approximately
1.3 V up to a maximum current of -240
μ
A (typical). At
-240
μ
A, it turns into a constant current source (refer to
Figure 12a).
There are two functions available through the use of the
EXTERNAL CURRENT LIMIT pin: external current limit
and remote ON/OFF. Connecting the EXTERNAL CURRENT
LIMIT pin and SOURCE pin disables the two functions. In
high efficiency applications this pin can be used to reduce the
current limit externally to a value close to the operating peak
current, by connecting the pin to the SOURCE pin through a
resistor. The pin can also be used for remote ON/OFF. Table 2
shows several possible combinations using this pin. See
Figure 11 for a description of the functions where the horizontal
axis (left hand side) represents the EXTERNAL CURRENT
LIMIT pin current. The meaning of the vertical axes varies
with function. For those that control the ON/OFF states of the
output such as remote ON/OFF, the vertical axis represents the
enable/disable states of the output. For external current limit,
the vertical axis represents the magnitude of the I
. Please
see graphs in the Typical Performance Characteristics section
for the current limit programming range and the selection of
appropriate resistor value.
MULTI-FUNCTION (M) Pin Operation (P and G Packages)
The LINE-SENSE and EXTERNAL CURRENT LIMIT pin
functions are combined to a single MULTI-FUNCTION pin
for P and G packages. The comparator with a 1 V threshold at
the LINE-SENSE pin is removed in this case as shown in Figure
2b. All of the other functions are kept intact. However, since
some of the functions require opposite polarity of input current
(MULTI-FUNCTION pin), they are mutually exclusive. For
example, line sensing features cannot be used simultaneously
with external current limit setting. When current is fed into
the MULTI-FUNCTION pin, it works as a voltage source of
approximately 2.6 V up to a maximum current of +400
μ
A
(typical). At +400
μ
A, this pin turns into a constant current
sink. When current is drawn out of the MULTI-FUNCTION
pin, it works as a voltage source of approximately 1.3 V up to
a maximum current of -240
μ
A (typical). At -240
μ
A, it turns
into a constant current source. Refer to Figure 12b.
There are a total of five functions available through the use of
the MULTI-FUNCTION pin: OV, UV, line feed-forward with
DC
reduction, external current limit and remote ON/OFF.
A short circuit between the MULTI-FUNCTION pin and
SOURCE pin disables all five functions and forces
TOPSwitch-GX
to operate in a simple three terminal mode like
TOPSwitch-II
. The MULTI-FUNCTION pin is typically used
for line sensing by connecting a resistor from this pin to the
rectified DC high voltage bus to implement OV, UV and DC
reduction with line voltage. In this mode, the value of the
resistor determines the line OV/UV thresholds, and the DC
is reduced linearly with increasing rectified DC high voltage
starting from just above the UV threshold. External current
limit programming is implemented by connecting the MULTI-
FUNCTION pin to the SOURCE pin through a resistor.
However, this function is not necessary in most applications
since the internal current limit of the P and G package devices
has been reduced, compared to the Y, R and F package devices,
to match the thermal dissipation capability of the P and G
Table 3. Typical MULTI-FUNCTION Pin Configurations.
MULTI-FUNCTION PIN TABLE*
30
31
32
33
34
35
36
37
38
39
40
▲
Figure Number
Three Terminal Operation
Under-Voltage
Overvoltage
Line Feed-Forward (DC
MAX
)
Overload Power Limiting
External Current Limit
Remote ON/OFF
*This table is only a partial list of many MULTI-FUNCTION pin configurations that are possible.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TOP250R- | 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 |
| TOP250RN- | 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 |
| TOP250RN-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 |
| TOP250R-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 55 W 85-265 VAC 82 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 |
| TOP250Y | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 210 W 85-265 VAC 290 W 230 VACX 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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