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參數(shù)資料
| 型號： | NCP1200D |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| 中文描述： | PWM電流模式控制器的通用離線用品，具有低待機(jī)功耗 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 136K |
| 代理商： | NCP1200D |
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NCP1200AD100R2 | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| NCP1200AD100R2G | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| NCP1200AD40R2 | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| NCP1200 | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
| NCP1200D100R2 | PWM Current-Mode Controller for Low-Power Universal Off-Line Supplies |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1200D100R | 制造商:Rochester Electronics LLC 功能描述: 制造商:ON Semiconductor 功能描述: |
| NCP1200D100R2 | 功能描述:電流型 PWM 控制器 100KHz Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
| NCP1200D100R2G | 功能描述:電流型 PWM 控制器 100KHz Current Mode SMPS PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
| NCP1200D100R2G | 制造商:ON Semiconductor 功能描述:Pulse Width Modulation (PWM) Controller |
| NCP1200D40R2 | 功能描述:電流型 PWM 控制器 40KHz Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 |
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