参数资料
| 型号： | FSBH0270ANY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 13/16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）： | 20W |
| 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 |
Brown-In Function of FSBH0x70A
The VIN pin functions are disabled from FSBH0x70A,
but FSBH0x70A has brown-in protection in the VDD pin.
There is a discharge current internal from V DD to ground
during startup. The HV source current must be larger
than I DD-ST to charge the capacitor of V DD . Therefore, the
brown-in level can be determined by R HV according to
the equation:
H/L Line Over-Power Compensation
To limit the output power of the converter constantly,
high/low line over-power compensation is included.
Sensing the converter input voltage through the VIN pin,
the high/low line compensation function generates a
relative peak-current-limit threshold voltage for constant
power control, as shown in Figure 32.
R HV =
2 V AC ? 12
I DD ? ST
(4)
Green-Mode Operation
The FSBH-series uses feedback voltage (V FB ) as an
indicator of the output load and modulates the PWM
frequency, as shown in Figure 30, such that the
switching frequency decreases as load decreases. In
heavy load conditions, the switching frequency is
100kHz. Once V FB decreases below V FB-N (2.5V), the
PWM frequency starts to linearly decrease from 100kHz
to 18kHz for reducing switching losses. As V FB
decreases below V FB-G (2.0V), the switching frequency is
fixed at 18kHz and FSBH-series enters “deep” green
mode to reduce the standby power consumption.
Figure 32. Constant Power Control
Protections
The FSBH-series provides full protection functions to
prevent the power supply and the load from being
damaged. The protection features include:
Latch/Auto-Recovery Function
Besides the brownout protection and high/low line over-
power compensation, the FSBH0170/0270/0370 has
additional protections via the VIN pin, such as pull-
HIGH latch and pull-LOW auto-recovery that depends
on the application. As shown in Figure 33, V IN level is
higher than 4.7V, FSBH-series is latched until the V DD is
discharged. FSBH-series is auto-recovery when the V IN
level is lower than 0.3V.
Figure 30.
PWM Frequency
As V FB decreases below V FB-ZDC (1.6V), FSBH-series
enters into burst-mode operation. When V FB drops
below V FB-ZDC , FSBH-series stops switching and the
output voltage starts to drop, which causes the
feedback voltage to rise. Once V FB rises above V FB-ZDC ,
switching resumes. Burst mode alternately enables and
disables switching, thereby reducing switching loss to
improve power saving, as shown in Figure 31.
V O
Figure 33.
VIN Pin Function
V FB
V FB.ZDC
(1.6V)
I Drain
Open-Loop / Overload Protection (OLP)
When the upper branch of the voltage divider for the
shunt regulator (KA431 shown) is broken, as shown in
Figure 34, or over current or output short occurs, there
is no current flowing through the opto-coupler transistor,
which pulls the feedback voltage up to 6V.
When feedback voltage is above 4.6V for longer than
56ms, OLP is triggered. This protection is also triggered
Switching
Disabled
Switching
Disabled
when the SMPS output drops below the nominal value
longer than 56ms due to the overload condition.
Figure 31. Burst-Mode Operation
? 2009 Fairchild Semiconductor Corporation
FSBH0F70A, FSBH0170/A, FSBH0270/A, FSBH0370 ? Rev. 1.0.3
13
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSBH0270NY | 功能描述:IC OFF-LINE SWITCH PWM 8DIP RoHS:是 类别:集成电路 (IC) >> PMIC - AC-DC 转换器，离线开关 系列:FPS™ 标准包装:3,000 系列:- 输出隔离:隔离 频率范围:61kHz ~ 71kHz 输入电压:9.4 V ~ 28 V 输出电压:12V 功率（瓦特）:- 工作温度:-40°C ~ 125°C 封装/外壳:SC-74，SOT-457 供应商设备封装:6-TSOP 包装:带卷 (TR) |
| FSBH0270NY_F116 | 功能描述:电源开关 IC - USB 2A/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 |
| FSBH0270W | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPSa?￠) |
| FSBH0270WNY | 功能描述:电源开关 IC - 配电 2A/700V 100kHz SW RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSBH0370 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch |
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