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参数资料
| 型号： | FSBH0370NY_F116 |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 106 kHz SWITCHING FREQ-MAX, DIP8 |
| 封装： | GREEN, MS-001BA, DIP-8 |
| 文件页数： | 4/16页 |
| 文件大小： | 938K |
| 代理商： | FSBH0370NY_F116 |
2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSBH0F70A_F116, FSBH0170/0270/0370_F116 Rev. 1.0.1
12
FSBH0F70
A_F116,
F
S
BH0170/
0270/0370_F116
—
Green
Mode
Fairchild
Po
wer
Switch
(FPS)
Functional Description
Startup Operation
The HV pin is connected to bulk voltage through an
external resistor, RHV, as shown in Figure 26. When AC
voltage is applied to the power system, an internal HV
startup circuit provides a high current (around 3.5mA) to
charge an external VDD capacitor until VDD voltage
exceeds the turn-on threshold voltage (VDD-ON). For
lower power consumption, the HV startup circuit shuts
down during normal operation. The external VDD
capacitor and auxiliary winding maintain the VDD voltage
and provide operating current to controller.
Figure 26.
Startup Circuit
Slope Compensation
The FSBH-series is designed for flyback power
converters. The peak-current-mode control is used to
optimize system performance. Slope compensation is
added to reduce current loop gain and improve power
system stability. The FSBH-series has a built-in,
synchronized, positive slope for each switching cycle.
Soft-Start
The FSBH-series has an internal soft-start circuit that
reduces the SenseFET switching current during power
system startup. The characteristic curve of soft-start
time versus VLMT level is shown in Figure 27. The VLMT
level rises in six steps. By doing so, the power system
can smoothly build up the rated output voltage and
effectively reduce voltage stress on the PWM switch
and output diode.
Figure 27.
Soft-Start Function
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 VIN
increases above 1.1V. Because the divider resistors of
the VIN pin are connected behind the bridge, the ratio
calculations 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
20.6
C
AC OUT
AB
C
R
V
RR
R
(1)
Brownout with non-PFC:
_
20.6
C
AC OUT
AB
C
R
V
RR
R
(2)
Brown-in level is determined by:
_
1.1
2
A
BC
AC
IN
C
RR
R
V
R
(3)
Figure 29.
VIN Level According to PFC Operation
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| FSBH0F70ANY_F116 | 0.83 A SWITCHING CONTROLLER, 106 kHz SWITCHING FREQ-MAX, DIP8 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| FSBH0F70WA | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPSa?￠) |
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