参数资料
| 型号： | FSB117HNY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC FPS POWER SWITCH 8-MDIP |
| 标准包装： | 50 |
| 系列： | mWSaver™ |
| 输出隔离： | 隔离 |
| 频率范围： | 94kHz ~ 106kHz |
| 输入电压： | 7 V ~ 30 V |
| 输出电压： | 700V |
| 功率（瓦特）： | 15W |
| 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-MDIP |
| 包装： | 管件 |
| 其它名称： | FSB117HNY-ND |
mWSaver? Technology
AX-CAP? to Remove X-Cap Discharge Resistor
The EMI filter in the front end of the switched mode
power supply typically includes a capacitor across the
AC line connector, as shown in Figure 24. Most of the
safety regulations, such as UL 1950 and IEC61010-1,
require the capacitor be discharged to a safe level within
a given time after unplugged from the power outlet.
Typically a discharge resister across the capacitor is
Figure 21. Current Limit Variation During Soft-Start
Adjustable Peak Current Limit & H/L Line
Compensation for Constant Power Limit
To make the limited output power constant regardless
of the line voltage condition, a special current-limit
profile with sample and hold is used (as shown in
Figure 22). The current-limit level is sampled and held
at the falling edge of gate drive signal as shown in
Figure 23. Then, the sampled current limit level is used
for the next switching cycle. The sample-and-hold
function prevents sub-harmonic oscillation in current-
mode control.
The current-limit level increases as the duty cycle
increases, which reduces the current limit as duty cycle
decreases. This allows lower current-limit level for high-
line voltage condition where the duty cycle is smaller
than that of low line. Therefore, the limited maximum
output power can remain constant even for a wide input
voltage range.
The peak current limit is programmable using a resistor
on the IPK pin. The internal current 50 μA source for the
IPK pin generates voltage drop across the resistor. The
voltage of the IPK pin determines the current-limit level.
Since the upper and lower clamping voltage of the IPK
pin are 3 V and 1.5 V, respectively, the suggested
resistor value is from 30 k ? to 60 k ? .
Figure 22. I LMT vs. PWM Turn-On Time
used to ensure the capacitor is discharged naturally,
which however introduces power loss of the power
supply. As power level increases, the EMI filter capacitor
tends to increase, requiring a smaller discharge resistor
to maintain same discharge time. This typically results in
more power dissipation in high-power applications. The
innovative AX-CAP? technology intelligently discharges
the filter capacitor only when the power supply is
unplugged from the power outlet. Since the AX-CAP?
discharge circuit is disabled in normal operation, the
power loss in the EMI filter size can be virtually removed.
Figure 24. AX-CAP? Circuit
Green Mode
The FSB-series modulates the PWM frequency as a
function of FB voltage, as shown in Figure 25. Since the
output power is proportional to the FB voltage in current-
mode control, the switching frequency decreases as load
decreases. In heavy-load conditions, the switching
frequency is 100 kHz. Once V FB decreases below V FB-N
(2.6 V), the PWM frequency linearly decreases from
100 kHz to 23 kHz to reduce switching losses at light-
load condition. As V FB decreases to V FB-G (2.4 V), the
switching frequency is fixed at 23 kHz.
As V FB falls below V FB-ZDC (2.1 V), the FSB-series enters
Burst Mode operation, where PWM switching is
disabled. Then, the output voltage starts to drop, causing
the feedback voltage to rise. Once V FB rises above V FB-
ZDCR , switching resumes. Burst Mode alternately enables
and disables switching, thereby reducing switching loss
to reduce power consumption, as shown in Figure 26.
Figure 23. Current Limit Variation with Duty Cycle
Figure 25.
PWM Frequency
? 2011 Fairchild Semiconductor Corporation
FSB117H / FSB127H / FSB147H ? Rev. 1.0.7
13
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSB127H | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:mWSavera?￠ Fairchild Power Switch (FPSa?￠) |
| FSB127HNY | 功能描述:电流型 PWM 控制器 Green Mode Fairchild 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 |
| FSB137HLN | 制造商:Fairchild Semiconductor Corporation 功能描述:Green Mode Fairchild Power Switch |
| FSB147H | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:mWSaver Fairchild Power Switch |
| FSB147HNY | 功能描述:电流型 PWM 控制器 mWSaver Fairchild Power Switch (FPS) 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 |
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