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| 型号： | SG6846BLSY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 4/15页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM PROG GREEN OVP 8SOP |
| 标准包装： | 2,500 |
| 输出隔离： | 隔离 |
| 频率范围： | 44.8 ~ 136kHz |
| 输入电压： | 10.5 V ~ 30 V |
| 输出电压： | 18V |
| 功率（瓦特）： | 400mW |
| 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： | 带卷 (TR) |
Pin Configuration
Figure 5. Pin Configuration
Pin Definitions
Pin #
1
Name
GND
Function
Ground
Description
Ground.
The signal from the external compensation circuit is fed into this pin. The PWM
2
FB
Feedback
duty cycle is determined in response to the signal from this pin and the current-
sense signal from pin 6.
3
4
VIN
RI
Line-voltage
Detection
Reference
Setting
Line-voltage detection is used for brownout protection with hysteresis. Constant
output power limit over universal AC input range is achieved using this pin. Add
a low-pass filter to filter out line ripple on the bulk capacitor.
A resistor from the RI pin to ground generates a reference current source that
determines the switching frequency. Increasing the resistance reduces the
switching frequency. A 26k ? resistor results in a 65kHz switching frequency.
For over-temperature protection, an external NTC thermistor is connected from
5
RT
Temperature
Detection
this pin to the GND pin. The impedance of the NTC decreases at high
temperatures. Once the voltage of the RT pin drops below a threshold, PWM
output is disabled.
The sensed voltage is used for peak-current-mode control and cycle-by-cycle
6
SENSE
Current Sense
current limiting. If the switching current is higher than OCP threshold and lasts
for 200ms, SG6846B turns off immediately. This two-level OCP feature is
especially suitable for SMPS with surge current output.
7
8
VDD
GATE
Power Supply
Driver Output
If an open-circuit failure occurs in the feedback loop, the internal protection
circuit disables PWM output as long as V DD exceeds a threshold.
The totem-pole output driver for the power MOSFET; internally clamped
below 18V.
? 2008 Fairchild Semiconductor Corporation
SG6846B ? Rev. 1.3.4
4
www.fairchildsemi.com
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相关代理商/技术参数 |
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| SG6846BLSZ | 功能描述:电流型 PWM 控制器 Highly-Integrated Green-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 |
| SG6846C | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Highly Integrated Green-Mode PWM Controller |
| SG6846CD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Highly-Integrated Green-Mode PWM Controller |
| SG6846CDSMC_DBB14 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG6846CDZ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Highly-Integrated Green-Mode PWM Controller |
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