参数资料
| 型号： | NCP1381DR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 6/25页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO CM 14SOIC |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 125kHz |
| 电源电压： | 11 V ~ 20 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP1381DR2GOSCT |
NCP1381, NCP1382
APPLICATION INFORMATION
The NCP1381/82 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 NCP1381/82
controller.
? Current--mode operation with Quasi--Resonant
Operation : Implementing peak current mode control,
the NCP1381/82 waits until the drain--source voltage
crosses a minimum level. This is the quasi--resonance
approach, minimizing both EMI radiations and
capacitive losses.
? Skip--cycle Capability : A continuous flow of pulses in
not compatible with no--load 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
Soft--Skip 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
? Over Power Protection : Using a voltage image of the
bulk level, via the brown--out 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 m 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 auto--recovery burst mode.
? Blanking Time : To prevent false tripping with energetic
leakage spikes, the controllers includes a 3 m s blanking
time after the toff event.
? Go--to--Standby Signal for PFC Front Stage : The
NCP1381/82 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 front--end 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 skip--cycle 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 front--end 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
short--circuit conditions, the PFC is disabled to lower
the stress applied to the PWM main switch.
? Low Startup--Current : Reaching a low no--load 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 m A maximum, helping the designer to reach a
low standby power level.
?
?
?
?
?
reduce or increase the skip cycle level. Adjusting the
skip level also adjusts the maximum switching frequency
before skip occurs.
Soft--Start : A circuitry provides a soft--start sequence
which precludes the main power switch from being
stressed upon startup. This soft--start 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 latched--off and needs the
V CC to go down below 4.0 V to reset, for instance
when the user unplugs the SMPS.
Brown--out 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 brown--out conditions, the PFC is
not activated.
Short--circuit Protection : Short--circuit 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 latch--off phase, operating in a
low--frequency burst--mode. 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).
http://onsemi.com
6
相关PDF资料 |
PDF描述 |
|---|---|
| NCP1392BDR2G | IC HALF BRIDGE DVR HV OSC 8SOIC |
| NCP1392DDR2G | IC HALF BRIDGE DVR HV OSC 8SOIC |
| NCP1393BDR2G | IC HALF BRIDGE DVR HV OSC 8SOIC |
| NCP1395BPG | IC REG CTRLR PWM VM 16-DIP |
| NCP1396BDR2G | IC REG CTRLR ISO PWM VM 16-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1382DR2G | 功能描述:电流型 PWM 控制器 L-STNDBY PWM CNTRLR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1392B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High-Voltage Half-Bridge Driver with Inbuilt Oscillator |
| NCP1392B_09 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High-Voltage Half-Bridge Driver with Inbuiltc Oscillator |
| NCP1392BDR2G | 功能描述:功率驱动器IC HV HALF-BRIDGE DRVER RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| NCP1392DDR2G | 功能描述:功率驱动器IC HV HALF-BRIDGE DRIVER RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
发布紧急采购，3分钟左右您将得到回复。