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參數(shù)資料
| 型號： | NCP1201P100G |
| 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 with Fault Protection Modes |
| 中文描述： | SWITCHING CONTROLLER, 117 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | HALOGEN FREE, BFR FREE AND ROHS COMPLIANT, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大小： | 159K |
| 代理商： | NCP1201P100G |
NCP1201
http://onsemi.com
15
As shown below, the fault logic is armed once
V
CC
crosses
10 V after startup phase. When powering the device from an
auxiliary winding, meeting this condition can sometimes be
problematic since upon startup,
V
CC
naturally goes up and
not down as with a DSS. As a result,
V
CC
never crosses 10 V
and the fault logic is not activated. If a shortcircuit takes
place, the fault circuitry activates as soon as
V
CC
collapses
below 10 V (because of the coupling between
V
aux
and
V
out
), but in presence of a broken optocoupler, i.e. feedback
is open,
V
CC
increases and the fault will never triggered! To
avoid this problem, the application note “Tips and Tricks
with NCP1200, AN8069/D” offers some possible solutions
where the DSS is kept for protection logic operation only but
all the driving power is derived from the auxiliary winding.
Some solutions even offer the ability to disable the DSS in
standby and benefit to low standby power.
Figure 34. Fault Protection Timing Diagram
Regulation
occurs here
Overload is
not activated
Overload is
activated
Driver
Pulses
Latchedoff
Fault occurs here
Regulation
Openloop
FB level
V
CC
12 V
10 V
No synchronization
between DSS and
fault event
Time
Time
Time
Drv
FB
Calculating the V
CC
Capacitor
As the above section describes, the fall down sequence
depends upon the
V
CC
level, i.e. how long does it take for the
V
CC
line to decrease from 12.5 V to 10.5 V. The required
time depends on the powerup sequence of your system, i.e.
when you first apply the power to the device. The
corresponding transient fault duration due to the output
capacitor charging must be less than the time needed to
discharge from 12.5 V to 10.5 V, otherwise the supply will
not properly startup. The test consists in either simulating or
measuring in the laboratory to determine time required for
the system to reach the regulation at full load. Let’s assume
that this time corresponds to 6.0 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:
t
V = 2.0 V. Then for a wanted t of 10 ms, C equals 9.0 F
or 10 F for a standard value. When an overload condition
occurs, the IC blocks its internal circuitry and its
consumption drops to 575 A typical. This explains the
V
CC
falling slope changes after latchoff in Figure 34.
V
C
i
, with
相關(guān)PDF資料 |
PDF描述 |
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| NCP1201 | PWM Current Mode Controller for Universal Off Line Supplies Featuring Low Standby Power with Fault Protection Modes(PWM電流模式控制器，適用于通用離線電源，以低待機(jī)功耗與故障保護(hù)模式為特點(diǎn)) |
| NCP1203D40R2G | PWM Current−Mode Controller for Universal Off−Line Supplies Featuring Standby and Short Circuit Protection |
| NCP1203P100G | PWM Current−Mode Controller for Universal Off−Line Supplies Featuring Standby and Short Circuit Protection |
| NCP1203P40G | PWM Current−Mode Controller for Universal Off−Line Supplies Featuring Standby and Short Circuit Protection |
| NCP1203P60G | PWM Current−Mode Controller for Universal Off−Line Supplies Featuring Standby and Short Circuit Protection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1201P60 | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 Current Mode PWM 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 |
| NCP1201P60G | 功能描述:電流型 PWM 控制器 Current Mode PWM w/Fault Protection 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 |
| NCP1203 | 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 Standby and Short Circuit |
| NCP1203/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit Protection |
| NCP1203_05 | 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 Standby and Short Circuit Protection |
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