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| 型号： | NCP1201D100R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM CM OTP 8SOIC |
| 产品变化通告： | Product Obsolescence 01/Jul/2009 |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 92kHz ~ 117kHz |
| 输入电压： | 12.5 V ~ 16 V |
| 输出电压： | 500V |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP1201D100R2GOSCT |
NCP1201
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 short--circuit 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.
V CC
Regulation
occurs here
12 V
10 V
No synchronization
between DSS and
fault event
Time
Drv
Overload is
not activated
Driver
Pulses
Overload is
activated
Latched--off
Time
Open--loop
FB
FB level
Regulation
Fault occurs here
Figure 34. Fault Protection Timing Diagram
Time
capacitor using the following formula: Δ t = Δ V × C , with
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
i
Δ V = 2.0 V. Then for a wanted Δ t of 10 ms, C equals 9.0 m F
or 10 m F for a standard value. When an overload condition
occurs, the IC blocks its internal circuitry and its
consumption drops to 575 m A typical. This explains the V CC
falling slope changes after latchoff in Figure 34.
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1201D60R2 | 功能描述:电流型 PWM 控制器 Current Mode PWM 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 |
| NCP1201D60R2G | 功能描述:电流型 PWM 控制器 Current Mode PWM w/Fault Protection 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 |
| NCP1201P100 | 功能描述:电流型 PWM 控制器 Current Mode PWM 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 |
| NCP1201P100G | 功能描述:电流型 PWM 控制器 Current Mode PWM w/Fault Protection 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 |
| NCP1201P60 | 功能描述:交流/直流开关转换器 Current Mode PWM RoHS:否 制造商:STMicroelectronics 输出电压:800 V 输入/电源电压（最大值）:23.5 V 输入/电源电压（最小值）:11.5 V 开关频率:115 kHz 电源电流:1.6 mA 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SSO-10 封装:Reel |
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