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參數(shù)資料
| 型號(hào)： | TOP232-234 |
| 廠商： | Power Integrations, Inc. |
| 英文描述： | Family Design Flexible,EcoSmart, Intergrated OFff-line Switcher |
| 中文描述： | 家庭設(shè)計(jì)靈活，EcoSmart節(jié)能，綜合OFff線切換 |
| 文件頁數(shù)： | 9/36頁 |
| 文件大?。?/td> | 650K |
| 代理商： | TOP232-234 |
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TOP232-234
B
7/01
9
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 functions. 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. In high efficiency
applications this pin can be used in the external current limit
mode instead, 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 same pin can also be used
as a remote on/off and a synchronization input in both modes.
Please refer to Table 2 for possible combinations of the functions
with example circuits shown in Figure 13 through Figure 23. A
description of specific functions in terms of the MULTI-
FUNCTION pin I/V characteristic is shown in Figure 8. The
horizontal axis represents MULTI-FUNCTION 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
(+50
μ
A typical)
and OV triggers at I
(+225
μ
A typical). Between +50
μ
A and
+225
μ
A, the output is enabled. For external current limit and
line feed forward with DC
reduction, the vertical axis
represents the magnitude of the I
and DC
. Line feed
forward with DC
MAX
reduction lowers maximum duty cycle from
78% at I
(+90
A typical) to 38% at I
OV
(+225
μ
A). External
current limit is available only with negative
MULTI-FUNCTION
pin current. Please see graphs in the typical performance
characteristics section for the current limit programming range
and the selection of appropriate resistor value.
FREQUENCY (F) Pin Operation
The FREQUENCY pin is a digital input pin available in
TO-220 package only. Shorting the FREQUENCY pin to
SOURCE pin selects the nominal switching frequency of
132 kHz (Figure 10) 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 11). In
addition, an example circuit shown in Figure 12 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.
MULTI-FUNCTION (M) Pin Operation
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 1.32 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 9.
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-FX
to operate in a simple three terminal mode like
TOPSwitch-II
. The MULTI-FUNCTION pin is typically used
Table 2. Typical MULTI-FUNCTION Pin Configurations.
MULTI-FUNCTION PIN TABLE*
13
14
15
16
17
18
19
20
21
22
23
*This table is only a partial list of many MULTI-FUNCTION pin configurations that are possible.
Using FREQUENCY and MULTI-
FUNCTION Pins
L
Figure Number
Three Terminal Operation
Under-Voltage
Overvoltage
Line Feed Forward (DC
MAX
)
Line Feed Forward (I
LIMIT
)
External Current Limit
Remote ON/OFF
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| TOP232G-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 10W 85-265 VAC 15W 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 |
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