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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290瓦的擴展能力。設計靈活。 |
| 文件頁數(shù)： | 10/52頁 |
| 文件大?。?/td> | 468K |
| 代理商： | TOP250R |
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TOP242-250
10
K
9/03
pin to the SOURCE pin disables all four functions. The LINE-
SENSE 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 rectified DC
high voltage starting from just above the UV threshold. The pin
can also be used as a remote ON/OFF and a synchronization input.
Refer to Table 2 for possible combinations of the functions with
example circuits shown in Figure 16 through Figure 40. A
description of specific functions in terms of the LINE-SENSE
pin I/V characteristic is shown in Figure 11 (right hand side).
The horizontal axis represents LINE-SENSE pin current with
positive polarity indicating currents flowing into the pin. The
meaning of the vertical axes varies with functions. For those
that control the on/off states of the output such as UV, OV and
remote ON/OFF, the vertical axis represents the enable/
disable states of the output. UV triggers at I
UV
(+50
μ
A typical
DPA-SwitchDC-DC Seminar 8
LinkSwitch & TinySwitch-IIAC-DC Seminar 9
TOPSwitch-GXAC-DC Seminar 10
Sales Representatives and Distributors 11
16
17
18
19
20
Table 2. Typical LINE-SENSE and EXTERNAL CURRENT LIMIT Pin Configurations.
*This table is only a partial list of many LINE-SENSE and EXTERNAL CURRENT LIMIT pin configurations that are possible.
▲
Figure Number
Three Terminal Operation
Under-Voltage
Overvoltage
Line Feed-Forward (DC
MAX
)
Overload Power Limiting
External Current Limit
Remote ON/OFF
LINE-SENSE AND EXTERNAL CURRENT LIMIT PIN TABLE*
Bandgap Reference
All critical
TOPSwitch-GX
internal voltages are derived from
a temperature-compensated bandgap reference. This reference
is also used to generate a temperature-compensated current
reference which is trimmed to accurately set the switching
frequency, MOSFET gate drive current, current limit, and the
line OV/UV thresholds.
TOPSwitch-GX
has improved circuitry
to maintain all of the above critical parameters within very tight
absolute and temperature tolerances.
High-Voltage Bias Current Source
This current source biases
TOPSwitch-GX
from the DRAIN
pin and charges the CONTROL pin external capacitance
during start-up or hysteretic operation. Hysteretic operation
occurs during auto-restart, remote off and over-temperature
shutdown. In this mode of operation, the current source is
switched on and off with an effective duty cycle of
approximately 35%. This duty cycle is determined by the ratio
of CONTROL pin charge (I
) and discharge currents (I
and
I
). This current source is turned off during normal
operation when the output MOSFET is switching. The effect
of the current source switching will be seen on the DRAIN
voltage waveform as small disturbances and is normal.
Using Feature Pins
FREQUENCY (F) Pin Operation
The FREQUENCY pin is a digital input pin available in the
Y, R or F package only. Shorting the FREQUENCY pin to
SOURCE pin selects the nominal switching frequency of
132 kHz (Figure 13) which is suited for most applications. For
other cases that may benefit from lower switching
frequency such as noise sensitive video applications, a 66 kHz
switching frequency (half frequency) can be selected by
shorting the FREQUENCY pin to the CONTROL pin
(Figure 14). In addition, an example circuit shown in Figure 15
may be used to lower the switching frequency from 132 kHz in
normal operation to 66 kHz in standby mode for very low standby
power consumption.
LINE-SENSE (L) Pin Operation (Y, R and F Packages)
When current is fed into the LINE-SENSE 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. Refer to Figure 12a. In addition, a
comparator with a threshold of 1 V is connected at the pin and is
used to detect when the pin is shorted to the SOURCE pin.
There are a total of four functions available through the use of the
LINE-SENSE pin: OV, UV, line feed-forward with DC
reduction, and remote ON/OFF. Connecting the LINE-SENSE
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相關代理商/技術參數(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/直流開關轉換器 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 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| TOP250Y | 功能描述:交流/直流開關轉換器 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 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
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