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| 型号： | FAN6747LMY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 13/15页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR GREEN MODE 8-SOIC |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 61kHz ~ 69kHz |
| 输入电压： | 10 V ~ 24 V |
| 输出电压： | 14V |
| 功率（瓦特）： | 400mW |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 标准包装 |
| 其它名称： | FAN6747LMYDKR |
Built-In Slope Compensation
The sensed voltage across the current-sense resistor is
used for peak-current-mode control and pulse-by-pulse
current limiting. Built-in slope compensation improves
stability and prevents sub-harmonic oscillation.
FAN6747 inserts a synchronized, positive-going, ramp
at every switching cycle.
Constant Output Power Limit
When the SENSE voltage across sense resistor R S
reaches the threshold voltage, the output GATE drive is
turned off after a small delay, t PD . This delay introduces
an additional current proportional to t PD ? V IN / L P . Since
the delay is nearly constant regardless of the input
voltage V IN , higher input voltage results in a larger
additional current and the output power limit is higher
than under low input line voltage. To compensate this
variation for a wide AC input range, a power-limiter is
controlled by HV pin to solve the unequal power-limit
problem. The power limiter is fed to the inverting input of
the OCP comparator. This results in a lower current limit
at high-line input than at low-line input.
? 2010 Fairchild Semiconductor Corporation
FAN6747 ? Rev. 1.0.3
13
Over-Temperature Protection (OTP)
A NTC thermistor, R NTC , in series with a resistor, R A , is
connected from the RT pin to GND pin. A constant
current I RT is output from this pin. The voltage of the RT
pin can be expressed as V RT = I RT ? (R NTC + R A ), where
I RT is 100μA, the headroom of V RT is limited at around
5V by internal circuitry. As high ambient temperatures
occur, R NTC is smaller, such that the V RT decreases.
When V RT is less than 1.05V(V OTP ) but over 0.7V, the
PWM turns off after t D_OTP-LATCH . The other threshold,
V DD under 0.7V, is used for fast shut down of FAN6747
after a short time. If the RT pin is not connected to the
NTC resistor for over temperature protection, it is
recommended to connect one 100K Ω resistor to ground
to prevent noise interference. This pin is limited by
internal clamping circuit.
Noise Immunity
Noise on the current sense or control signal may cause
significant pulse-width jitter, particularly in continuous-
conduction mode. Slope compensation helps alleviate
this problem. Good placement and layout practices
should be followed. Avoiding long PCB traces and
component leads, locating compensation and filter
components near the FAN6747, and increasing the
power MOS gate resistance improve performance.
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN6747WALMY | 功能描述:电流型 PWM 控制器 Highly Integrated Grn Mode 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 |
| FAN6747WLMY | 功能描述:电流型 PWM 控制器 30V 2mA 22KHz 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 |
| FAN6749MLM | 功能描述:电流型 PWM 控制器 Ultra Green-Mode PWM Controller 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 |
| FAN6751 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| FAN6751HLMY | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
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