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参数资料
| 型号： | FSBH0370NY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC OFF-LINE SWITCH PWM 8DIP |
| 标准包装： | 59 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 94kHz ~ 106kHz |
| 输入电压： | 9 V ~ 30 V |
| 输出电压： | 700V |
| 功率（瓦特）： | 25W |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
| 产品目录页面： | 1222 (CN2011-ZH PDF) |
Functional Description
Startup Operation
The HV pin is connected to bulk voltage through an
external resistor, R HV , as shown in Figure 26. When AC
voltage is applied to power system, an internal HV
startup circuit provides a high current (around 3.5mA) to
charge an external V DD capacitor until V DD voltage
exceeds the turn-on threshold voltage (V DD-ON ). For
better power consumption, the HV startup circuit shuts
down during normal operation. The external V DD
capacitor and auxiliary winding maintain the V DD voltage
and provide operating current to controller.
Brown-In/Out Function
FSBH0x70 has a built-in internal brown-in/out protection
comparator monitoring voltage of VIN pin. Figure 28
shows a resistive divider with low-pass filtering for line-
voltage detection on the VIN pin.
Figure 28.
Brown-In/Out Function on VIN Pin
Once the VIN pin voltage is lower than 0.6V and lasts
for 500ms, the PWM gate is disabled to protect the
system from over current. FSBH0x70 starts up as V IN
increases above 1.1V. Because the divider resistors of
Figure 26. Startup Circuit
Slope Compensation
The FSBH-series is designed for flyback power
converters. The peak-current-mode control is used to
the VIN pin are connected behind the bridge, the ratio
calculation for brownout in PFC and non-PFC system
are different, as shown in Figure 29. The formulas are
provided in the following equations :
Brownout with PFC:
? 2 V AC _ OUT ? = 0.6
optimize system performance. Slope compensation is
added to reduce current loop gain and improve power
system stability. The FSBH-series has a built-in,
R C
R A + R B + R C
2
π
(1)
synchronized, positive slope for each switching cycle.
Brownout with non-PFC:
Soft-Start
The FSBH-series has an internal soft-start circuit that
R C
R A + R B + R C
? 2 V AC _ OUT = 0.6
(2)
reduces the SenseFET switching current during power
system startup. The characteristic curve of soft-start
Brown-in level is determined by:
1.1 R A + R B + R C
time versus V LMT level is shown in Figure 27. The V LMT
level slopes up like a six-step staircase. In doing so,
power system can smoothly build up the rated output
V AC _ IN =
2 R C
?
(3)
voltage and effectively reduce voltage stress on the
PWM switch and output diode.
Figure 27.
Soft-Start Function
Figure 29.
V IN Level According to PFC Operation
? 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 ? Rev. 1.0.3
12
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSBH0370NY_F116 | 功能描述:电源开关 IC - USB 3A/700V 100kHz SW RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| FSBH0F70A | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch |
| FSBH0F70A_10 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch |
| FSBH0F70ANY | 功能描述:电流型 PWM 控制器 0.5A/700V 100kHz Power Switch 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 |
| FSBH0F70ANY_F116 | 功能描述:电源开关 IC - USB GRN Mode PowerSwitch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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