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參數(shù)資料
| 型號： | NCP1014AP065G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | VARISTOR 150V RMS 7MM RADIAL |
| 中文描述： | 1 A SWITCHING REGULATOR, 71 kHz SWITCHING FREQ-MAX, PDIP7 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8/7 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 324K |
| 代理商： | NCP1014AP065G |
NCP1010, NCP1011, NCP1012, NCP1013, NCP1014
http://onsemi.com
16
Full Latching Shutdown
Other applications require a full latching shutdown, e.g.
when an abnormal situation is detected (overtemperature
or overvoltage). This feature can easily be implemented
through two external transistors wired as a discrete SCR.
When the OVP level exceeds the Zener breakdown
voltage, the NPN biases the PNP and fires the equivalent
SCR, permanently bringing down the FB pin. The
switching pulses are disabled until the user unplugs the
power supply.
Figure 24. Two Bipolars Ensure a Total LatchOff of the SMPS in Presence of an OVP
2
7
3
4
5
1
8
Drain
+CV
cc
BAT54
10 k
10 k
OVP
Rhold
12 k
Rhold ensures that the SCR stays on when fired. The bias
current flowing through Rhold should be small enough to let
the V
CC
ramp up (8.5 V) and down (7.5 V) when the SCR
is fired. The NPN base can also receive a signal from a
temperature sensor. Typical bipolars can be MMBT2222
and MMBT2907 for the discrete latch. The MMBT3946
features two bipolars NPN+PNP in the same package and
could also be used.
Power Dissipation and Heatsinking
The NCP101X welcomes two dissipating terms, the DSS
currentsource (when active) and the MOSFET. Thus,
Ptot = P
DSS
+ P
MOSFET
. When the PDIP7 package is
surrounded by copper, it becomes possible to drop its
thermal resistance junctiontoambient, R
JA
down
to 75
°
C/W and thus dissipate more power. The
maximum power the device can thus evacuate is:
TJmax
Tambmax
RJA
1.0 W for an ambient of 50
°
C. The losses inherent to the
MOSFET R
DSon
can be evaluated using the following
formula:
Pmos
3· Ip2· d · RDSon
is the worse case peak current (at the lowest line input), d is
the converter operating dutycycle and R
DSon
, the
MOSFET resistance for T
J
= 100
°
C. This formula is only
valid for Discontinuous Conduction Mode (DCM)
operation where the turnon losses are null (the primary
current is zero when you restart the MOSFET). Figure 25
gives a possible layout to help drop the thermal resistance.
When measured on a 35 m (1 oz) copper thickness PCB,
we obtained a thermal resistance of 75
°
C/W.
Pmax
(eq. 12)
which gives around
1
(eq. 13)
, where Ip
Figure 25. A Possible PCB Arrangement to Reduce the Thermal Resistance JunctiontoAmbient
相關(guān)PDF資料 |
PDF描述 |
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| NCP1014AP100 | VARISTOR 150V RMS 7MM RADIAL |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1014AP10 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Self-Supplied Monolithic Switcher for Low Standby- Power Offline SMPS |
| NCP1014AP100 | 功能描述:電流型 PWM 控制器 Low Standby Power RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1014AP100G | 功能描述:電流型 PWM 控制器 Low Standby Power Monolithic Switcher RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1014APL065R2G | 功能描述:電流型 PWM 控制器 ANA 1 FREQ GULL WING RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1014APL100R2 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Self-Supplied Monolithic Switcher for Low Standby- Power Offline SMPS |
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