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參數(shù)資料
| 型號： | NCP1203P60 |
| 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 Standby and Short Circuit |
| 中文描述： | 0.25 A SWITCHING CONTROLLER, 73 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PDIP-8 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 145K |
| 代理商： | NCP1203P60 |
NCP1203
http://onsemi.com
8
CurrentMode Operation
As the UC384X series, the NCP1203 features a
wellknown current mode control architecture which
provides superior input audiosusceptibility compared to
traditional voltagemode controllers. Primary current
pulsebypulse checking together with a fast over current
comparator offers greater security in the event of a difficult
fault condition, e.g. a saturating transformer.
Adjustable Skip Cycle Level
By offering the ability to tailor the level at which the skip
cycle takes place, the designer can make sure that the skip
operation only occurs at low peak current. This point
guarantees a noisefree operation with cheap transformers.
Skip cycle offers a proven mean to reduce the standby power
in no or light loads situations.
Wide SwitchingFrequency Offer
Four different options are available: 40 kHz 65 kHz –
100 kHz. Depending on the application, the designer can
pick up the right device to help reducing magnetics or
improve the EMI signature before reaching the 150 kHz
starting point.
Overcurrent Protection (OCP)
When the auxiliary winding collapses below UVLOlow,
the controller stops switching and reduces its consumption.
It stays in this mode until Vcc reaches 4.9 V typical, where
the startup source is reactivated and a new startup sequence
is attempted. The power supply is thus operated in burst
mode and avoids any lethal thermal runaway. When the
default goes way, the power supply automatically resumes
operation.
Wide DutyCycle Operation
Wide mains operation requires a large dutycycle
excursion. The NCP1203 can go up to 80% typically.
Low Standby Power
If SMPS naturally exhibit a good efficiency at nominal
load, they begin to be less efficient when the output power
demand diminishes. By skipping unneeded switching
cycles, the NCP1203 drastically reduces the power wasted
during light load conditions. In noload conditions, the
NCP1203 allows the total standby power to easily reach next
International Energy Agency (IEA) recommendations.
No Acoustic Noise while Operating
Instead of skipping cycles at high peak currents, the
NCP1203 waits until the peak current demand falls below a
useradjustable 1/3
rd
of the maximum limit. As a result,
cycle skipping can take place without having a singing
transformer
…
You can thus select cheap magnetic
components free of noise problems.
External MOSFET Connection
By leaving the external MOSFET external to the IC, you
can select avalanche proof devices which, in certain cases
(e.g. low output powers), let you work without an active
clamping network. Also, by controlling the MOSFET gate
signal flow, you have an option to slow down the device
commutation,
therefore
reducing
ElectroMagnetic Interference (EMI).
the
amount
of
SPICE Model
A dedicated model to run transient cyclebycycle
simulations is available but also an averaged version to help
you closing the loop. Readytouse templates can be
downloaded in OrCAD’s Pspice and INTUSOFT’s from ON
Semiconductor web site, NCP1203 related section.
Overload Operation
In applications where the output current is purposely not
controlled (e.g. wall adapters delivering raw DC level), it is
interesting to implement a true shortcircuit protection. A
shortcircuit actually forces the output voltage to be at a low
level, preventing a bias current to circulate in the
optocoupler LED. As a result, the auxiliary voltage also
decreases because it also operates in Flyback and thus
duplicates the output voltage, providing the leakage
inductance between windings is kept low. To account for this
situation and properly protect the power supply, NCP1203
hosts a dedicated overload detection circuitry. Once
activated, this circuitry imposes to deliver pulses in a burst
manner with a low dutycycle. The system autorecovers
when the fault condition disappears.
During the startup phase, the peak current is pushed to the
maximum until the output voltage reaches its target and the
feedback loop takes over. The auxiliary voltage takes place
after a few switching cycles and selfsupplies the IC. In
presence of a short circuit on the output, the auxiliary
voltage will go down until it crosses the undervoltage
lockout level of typically 7.8 V. When this happens,
NCP1203 immediately stops the switching pulses and
unbias all unnecessary logical blocks. The overall
consumption drops, while keeping the gate grounded, and
the V
CC
slowly falls down. As soon as V
CC
reaches typically
4.8 V, the startup source turnson again and a new startup
sequence occurs, bringing V
CC
toward 12.8 V as an attempt
to restart. If the default has gone, then the power supply
normally restarts. If not, a new protective burst is initiated,
shielding the SMPS from any runaway. Figure 15, on the
following page, portrays the typical operating signals in
short circuit.
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PDF描述 |
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| NCP1203D40R2 | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1203P60G | 功能描述:電流型 PWM 控制器 60KHz 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 |
| NCP1205 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback |
| NCP1205/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback |
| NCP1205_06 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback |
| NCP1205DR2 | 功能描述:IC CTRLR PWM CM OVP HV 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(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 |
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