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參數資料
| 型號： | NCP1381DR2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 英文描述： | Low−Standby High Performance PWM Controller |
| 中文描述： | 1 A SWITCHING CONTROLLER, 125 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | LEAD FREE, SOIC-14 |
| 文件頁數： | 6/26頁 |
| 文件大小： | 559K |
| 代理商： | NCP1381DR2G |
NCP1381
http://onsemi.com
6
APPLICATION INFORMATION
The NCP1381 includes all necessary features to help
building a rugged and safe switching power supply featuring
an extremely low standby power. The below bullets detail
the benefits brought by implementing the NCP1381
controller.
Currentmode operation with QuasiResonant
Operation
: Implementing peak current mode control,
the NCP1381 waits until the drainsource voltage
crosses a minimum level. This is the quasiresonance
approach, minimizing both EMI radiations and
capacitive losses.
Over Power Protection
: Using a voltage image of the
bulk level, via the brownout divider, the designer can
select a resistor which, placed in series with the current
sense information, provides an efficient line
compensation method.
Frequency Clamp
: The controller monitors the sum of
ton and toff, providing a real frequency clamp. Also the
ton maximum duration is safely limited to 50 s in case
the peak current information is lost. If the maximum
ton limit is reached, then the controller stops all pulses
and enters a safe autorecovery burst mode.
Blanking Time
: To prevent false tripping with energetic
leakage spikes, the controllers includes a 3 s blanking
time after the toff event.
GotoStandby Signal for PFC Front Stage
: The
NCP1381 includes an internal low impedance switch
connected between Pin 10 (V
CC
) and Pin 11 (GTS).
The signal delivered by Pin 11 being of low impedance,
it becomes possible to connect PFC’s V
CC
directly to
this pin and thus avoid any complicated interface
circuitry between the PWM controller and the PFC
frontend section. In normal operation, Pin 11 routes
the PWM auxiliary V
CC
to the PFC circuit which is
directly supplied by the auxiliary winding. When the
SMPS enters skipcycle at low output power levels, the
controller detects and confirms the presence of the skip
activity by monitoring the signal applied on its pin
ADJ_GTS (typically F
B
signal) and opens Pin 11,
shutting down the frontend PFC stage. When this
signal level increases, e.g. when the SMPS goes back to
a normal output power, Pin 11 immediately (without
delay) goes back to a low impedance state. Finally, in
shortcircuit conditions, the PFC is disabled to lower
the stress applied to the PWM main switch.
Low StartupCurrent
: Reaching a low noload standby
power represents a difficult exercise when the
controller requires an external, lossy, resistor connected
to the bulk capacitor. Due to a novel silicon
architecture, the startup current is guaranteed to be less
than 15 A maximum, helping the designer to reach a
low standby power level.
Skipcycle Capability
: A continuous flow of pulses in
not compatible with noload standby power
requirements. Slicing the switching pattern in bunch of
pulses drastically reduces overall losses but can, in
certain cases, bring acoustic noise in the transformer.
Due to a skip operation taking place at low peak currents
only, no mechanical noise appears in the transformer.
This is further strengthened by ON Semiconductor’s
SoftSkip technique, which forces the peak current in
skip to gradually increase. In case the default skip value
would be too large, connecting a resistor to the Pin 6 will
reduce or increase the skip cycle level. Adjusting the
skip level also adjusts the maximum switching frequency
before skip occurs.
SoftStart
: A circuitry provides a softstart sequence
which precludes the main power switch from being
stressed upon startup. This softstart is internal and
reaches 5 ms typical.
Overvoltage Protection
: By sensing the plateau level
after the power switch has opened, the controller can
detect an overvoltage condition through the auxiliary
reflection of the output voltage. If an OVP is sensed,
the controller stops all pulses and permanently stays
latched until the V
CC
is cycled down below 4.0 V.
External Latch Input
: By permanently monitoring
Pin 5, the controller detects when its level rises above
3.5 V, e.g. in presence of a fault condition like an OTP.
This fault is permanently latchedoff and needs the
V
CC
to go down below 4.0 V to reset, for instance when
the user unplugs the SMPS.
Brownout Detection
: By monitoring the level on Pin 2
during normal operation, the controller protects the
SMPS against low mains condition. When the Pin 2
level falls below 240 mV, the controllers stops pulsing
until this level goes back to 500 mV to prevent any
instability. During brownout conditions, the PFC is not
activated.
Shortcircuit Protection
: Shortcircuit and especially
overload protection are difficult to implement when a
strong leakage inductance between auxiliary and power
windings affects the transformer (the auxiliary winding
level does not properly collapse in presence of an
output short). Here, every time the internal 0.8 V
maximum peak current limit is activated, an error flag
is asserted and a time period starts, due to an external
timing capacitor. If the voltage on the capacitor reaches
4.0 V (after 90 ms for a 220 nF capacitor) while the
error flag is still present, the controller stops the pulses
and goes into a latchoff phase, operating in a
lowfrequency burstmode. As soon as the fault
disappears, the SMPS resumes its operation. The
latchoff phase can also be initiated, more classically,
when V
CC
drops below VCC
OFF
(10 V typical).
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP1382DR2G | 功能描述:電流型 PWM 控制器 L-STNDBY PWM CNTRLR RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1392B | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High-Voltage Half-Bridge Driver with Inbuilt Oscillator |
| NCP1392B_09 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High-Voltage Half-Bridge Driver with Inbuiltc Oscillator |
| NCP1392BDR2G | 功能描述:功率驅動器IC HV HALF-BRIDGE DRVER RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| NCP1392DDR2G | 功能描述:功率驅動器IC HV HALF-BRIDGE DRIVER RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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