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| 型号： | SG6901ASZ |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 17/19页 |
| 文件大小： | 714K |
| 描述： | IC PFC CTLR AVERAGE CURR 20SOIC |
| 标准包装： | 1 |
| 模式： | 平均电流 |
| 频率 - 开关： | 65kHz |
| 电流 - 启动： | 10µA |
| 电源电压： | 12 V ~ 20 V |
| 工作温度： | -30°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 标准包装 |
| 其它名称： | SG6901ASZDKR |
?2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
SG6901A " Rev. 1.0.2
17
Figure 28. V
RMS
Controlled Current Limiting
The peak current of the ISENSE is given by
(V
RMS
<1.05V):
S
P
P
SENSE_peak
R
0.2V
-
)
R
(I
I
?/DIV>
=
(8)
Flyback PWM and Slope Compensation
As shown in Figure 29, peak-current-mode control is
utilized for flyback PWM. The SG6901A inserts a
synchronized 0.5V ramp at the beginning of each
switching cycle. This built-in slope compensation
ensures stable operation for continuous current-mode
operation.
When the IPWM voltage, across the sense resistor,
reaches the threshold voltage (0.9V), the OPWM is
turned off after a small propagation delay t
PD-PWM
.
To improve stability or prevent sub-harmonic
oscillation, a synchronized positive-going ramp is
inserted at every switching cycle.
Figure 29. Peak Current Control Loop
Limited Power Control
Every time the output of the power supply is shorted or
overloaded, the FBPWM voltage increases. If the
FBPWM voltage is higher than a designed threshold,
FBOPEN-LOOP (4.5V) for longer than t
OPEN-PWM
(56ms), the OPWM is turned off.
As long as the voltage on the VDD pin is larger than
V
DD-OFF
(minimum operating voltage), the OPWM is not
enabled. This protection is reset every t
OPEN-PWM-Hiccup
interval. A low-frequency hiccup mode protection
prevents the power supply from being overheated
under overload conditions.
Over-Temperature Protection
The OTP pin provides for over-temperature protection.
A constant current is output from this pin. If R
I
is equal
to 24K&, the magnitude of the constant current is
100礎. An external NTC thermistor must be connected
from this pin to ground, as shown as Figure 30. When
the OTP voltage drops below V
OTP-OFF
(1.2V), SG6901A
is disabled and does not recover until OTP voltage
exceeds V
OTP-ON
(1.4V).
Figure 30. OTP Function
Soft Start
During startup of PWM stage, the SS pin charges an
external capacitor with a constant current source. The
voltage on FBPWM is clamped by the SS voltage
during startup. In the event of a protected condition
and/or PWM is disabled, the SS pin quickly discharges.
Gate Driver
SG6901A output stage is a fast totem-pole gate driver.
The output driver is clamped by an internal 18V Zener
diode to protect the external power MOSFET.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG6902 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green-Mode PFC / Flyback-PWM Controller |
| SG6902SZ | 功能描述:开关变换器、稳压器与控制器 Grn Mode PFC/Flyback PWM Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SG6903SZ | 功能描述:开关变换器、稳压器与控制器 Highly-Integrated Grn Mode PWM Cntrl RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SG6905 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green mode PFC/Flyback-PWM Controller |
| SG6905SY | 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述: |
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