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參數(shù)資料
| 型號(hào)： | NCP1200AP40 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| 中文描述： | 0.25 A SWITCHING CONTROLLER, 48 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大小： | 136K |
| 代理商： | NCP1200AP40 |
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NCP1200A
http://onsemi.com
11
DRIVER
PULSES
DRIVER
PULSES
TIME
TIME
TIME
Drv
V
CC
12 V
10 V
5.4 V
REGULATION
OCCURS
HERE
INTERNAL
FAULT FLAG
FAULT IS
RELAXED
FAULT OCCURS HERE
LATCHOFF
PHASE
STARTUP PHASE
Figure 21. If the fault is relaxed during the V
CC
natural fall down sequence, the IC automatically resumes.
If the fault still persists when V
CC
reached UVLO
L
, then the controller cuts everything off until recovery.
When this level crosses 5.4 V typical, the controller enters
a new startup phase by turning the current source on: V
CC
rises toward 12 V and again delivers output pulses at the
UVLO
H
crossing point. If the fault condition has been
removed before UVLO
L
approaches, then the IC continues
its normal operation. Otherwise, a new fault cycle takes
place. Figure 21 shows the evolution of the signals in
presence of a fault.
Calculating the V
CC
Capacitor
As the above section describes, the fall down sequence
depends upon the V
CC
level: how long does it take for the
V
CC
line to go from 12 V to 10 V The required time depends
on the startup sequence of your system, i.e. when you first
apply the power to the IC. The corresponding transient fault
duration due to the output capacitor charging must be less
than the time needed to discharge from 12 V to 10 V,
otherwise the supply will not properly start. The test consists
in either simulating or measuring in the lab how much time
the system takes to reach the regulation at full load. Let’s
suppose that this time corresponds to 6 ms. Therefore a V
CC
fall time of 10 ms could be well appropriated in order to not
trigger the overload detection circuitry. If the corresponding
IC consumption, including the MOSFET drive, establishes
at 1.8 mA for instance, we can calculate the required
capacitor using the following formula:
V = 2 V. Then for a wanted t of 10 ms, C equals 9 F or
22
F for a standard value. When an overload condition
occurs, the IC blocks its internal circuitry and its
consumption drops to 350 A typical. This happens at
V
CC
= 10 V and it remains stuck until V
CC
reaches 5.4 V: we
are in latchoff phase. Again, using the calculated 22 F and
350
A current consumption, this latchoff phase lasts:
296 ms.
t
V
C
i
, with
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1200AP40G | 功能描述:IC CTRLR PWM CM HV 8DIP RoHS:是 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開(kāi)關(guān) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
| NCP1200AP60 | 功能描述:IC CTRLR PWM CM HV 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開(kāi)關(guān) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
| NCP1200AP60G | 功能描述:IC CTRLR PWM CM HV 8DIP RoHS:是 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開(kāi)關(guān) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
| NCP1200D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| NCP1200D100R | 制造商:Rochester Electronics LLC 功能描述: 制造商:ON Semiconductor 功能描述: |
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