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| 型號： | TOP245FN-TL |
| 廠商： | POWER INTEGRATIONS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.88 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PZIP6 |
| 封裝： | LEAD FREE, PLASTIC, TO-262, 7/6 PIN |
| 文件頁數(shù)： | 45/52頁 |
| 文件大?。?/td> | 2175K |
| 代理商： | TOP245FN-TL |
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TOP242-250
5
N
4/05
TOPSwitch-GX
Family Functional
Description
Like TOPSwitch, TOPSwitch-GX is an integrated switched
mode power supply chip that converts a current at the control
input to a duty cycle at the open drain output of a high voltage
power MOSFET. During normal operation the duty cycle
of the power MOSFET decreases linearly with increasing
CONTROL pin current as shown in Figure 7.
In addition to the three terminal TOPSwitch features, such as
the high voltage start-up, the cycle-by-cycle current limiting,
loop compensation circuitry, auto-restart, thermal shutdown,
theTOPSwitch-GXincorporatesmanyadditionalfunctionsthat
reduce system cost, increase power supply performance and
design exibility. A patented high voltage CMOS technology
allows both the high voltage power MOSFET and all the low
voltage control circuitry to be cost effectively integrated onto
a single monolithic chip.
Three terminals, FREQUENCY, LINE-SENSE, and
EXTERNAL CURRENT LIMIT (available in Y, R or F
package) or one terminal MULTI-FUNCTION (available in P
or G package) have been added to implement some of the new
functions. These terminals can be connected to the SOURCE
pin to operate the TOPSwitch-GX in a TOPSwitch-like three
terminal mode. However, even in this three terminal mode, the
TOPSwitch-GX
offers many new transparent features that do
not require any external components:
1. A fully integrated 10 ms soft-start limits peak currents
and voltages during start-up and dramatically reduces or
eliminates output overshoot in most applications.
2. DC
MAX of 78% allows smaller input storage capacitor, lower
input voltage requirement and/or higher power capability.
3. Frequency reduction at light loads lowers the switching
lossesandmaintainsgoodcrossregulationinmultipleoutput
supplies.
4. Higher switching frequency of 132 kHz reduces the
transformer size with no noticeable impact on EMI.
5. Frequency jittering reduces EMI.
6. Hysteretic over-temperature shutdown ensures automatic
recovery from thermal fault. Large hysteresis prevents
circuit board overheating.
7. Packages with omitted pins and lead forming provide large
drain creepage distance.
8. Tighter absolute tolerances and smaller temperature
variations on switching frequency, current limit and PWM gain.
The LINE-SENSE (L) pin is usually used for line sensing by
connecting a resistor from this pin to the rectied DC high
voltage bus to implement line overvoltage (OV), under-voltage
(UV) and line feed-forward with DC
MAX reduction. In this
mode,thevalueoftheresistordeterminestheOV/UVthresholds
and the DC
MAX is reduced linearly starting from a line voltage
above the under-voltage threshold. See Table 2 and Figure 11.
The pin can also be used as a remote ON/OFF and a
synchronization input.
The EXTERNAL CURRENT LIMIT (X) pin is usually used
to reduce the current limit externally to a value close to the
operating peak current, by connecting the pin to SOURCE
through a resistor. This pin can also be used as a remote
ON/OFF and a synchronization input in both modes. See
Table 2 and Figure 11.
For the P or G packages the LINE-SENSE and EXTERNAL
CURRENTLIMITpin functions are combined on one MULTI-
FUNCTION (M) pin. However, some of the functions become
mutually exclusive as shown in Table 3.
The FREQUENCY (F) pin in the Y, R or F package sets the
switching frequency to the default value of 132 kHz when
connected to SOURCE pin. A half frequency option of
66 kHz can be chosen by connecting this pin to CONTROL pin
instead. Leaving this pin open is not recommended.
PI-2633-011502
Duty
Cycle
(%)
I
C (mA)
TOP242-5 1.6 2.0
TOP246-9 2.2 2.6
TOP250
2.4 2.7
5.2 6.0
5.8 6.6
6.5 7.3
I
CD1
I
B
Auto-restart
I
L = 125 A
I
L < IL(DC)
I
L = 190 A
78
10
38
Frequency
(kHz)
I
C (mA)
30
I
CD1
I
B
Auto-restart
132
Note: For P and G packages I
L is replaced with IM.
I
L < IL(DC)
I
L = 125 A
Slope = PWM Gain
I
L = 190 A
Figure 7. Relationship of Duty Cycle and Frequency to CONTROL
Pin Current.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TOP245F-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 |
| TOP245G- | 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 |
| TOP245GN | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 22W 85-265 VAC 30 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 |
| TOP245GN- | 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 |
| TOP245GN-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 22W 85-265 VAC 30 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 |
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