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| 型号： | FSEZ1317AMY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTLR PRIMARY REG 7-SOIC |
| 标准包装： | 2,500 |
| 输出隔离： | 隔离 |
| 频率范围： | 47kHz ~ 53kHz |
| 输入电压： | 5.5 V ~ 23 V |
| 输出电压： | 700V |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽）7 引线 |
| 供应商设备封装： | 7-SOP |
| 包装： | 带卷 (TR) |
Cable Voltage Drop Compensation
In cellular phone charger applications, the battery is
located at the end of cable, which typically causes several
percentage of voltage drop on the battery voltage.
FSEZ1317A has a built-in cable voltage drop
compensation that provides a constant output voltage at
the end of the cable over the entire load range in CV
mode. As load increases, the voltage drop across the
cable is compensated by increasing the reference voltage
of the voltage regulation error amplifier.
Operating Current
Operating current as small as 2.5mA results in higher
efficiency and reduces the VDD hold-up capacitance
requirement. Once enters “deep” Green Mode, the
operating current is reduced to 0.95mA, which helps the
power supply meet power conservation requirements
Green-Mode Operation
The FSEZ1317A uses voltage regulation error amplifier
output (V COMV ) as an indicator of the output load and
modulates the PWM frequency as shown in Figure 26.
The switching frequency decreases as the load
decreases. In heavy load conditions, the switching
frequency is fixed at 50kHz. Once V COMV decreases
below 2.5V, the PWM frequency linearly decreases from
50kHz. When FSEZ1317A enters deep green mode, the
PWM frequency is reduced to a minimum frequency of
370Hz, thus gaining power saving to meet international
power conservation requirements.
Figure 27. Frequency Hopping
High-Voltage Startup
Figure 28 shows the HV-startup circuit for FSEZ1317A
applications. The HV pin is connected to the line input or
bulk capacitor through a resistor, R START (100k ?
recommended). During startup status, the internal
startup circuit is enabled. Meanwhile, line input supplies
the current, I STARTUP , to charge the hold-up capacitor,
C DD , through R START . When the V DD voltage reaches V DD-
ON , the internal startup circuit is disabled, blocking
I STARTUP from flowing into the HV pin. Once the IC turns
on, C DD is the only energy source to supply the IC
consumption current before the PWM starts to switch.
Thus, C DD must be large enough to prevent V DD from
dropping down to V DD-OFF before the power can be
delivered from the auxiliary winding.
Figure 26. Switching Frequency in Green Mode
Frequency Hopping
EMI reduction is accomplished by frequency hopping,
which spreads the energy over a wider frequency range
than the bandwidth measured by the EMI test
equipment. FSEZ1317A has an internal frequency
hopping circuit that changes the switching frequency
between 46kHz and 54kHz over the period shown in
Figure 27.
Figure 28. HV Startup Circuit
? 2012 Fairchild Semiconductor Corporation
FSEZ1317A ? Rev. 1.0.4
11
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSEZ1317AMY_F116 | 功能描述:初级与次级侧 PWM 控制器 PSR PWM Controller w/integrated MOSFET RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
| FSEZ1317MY | 功能描述:初级与次级侧 PWM 控制器 EZSWITCH PSR PWM Cont. w/ Int. MOSFET RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
| FSEZ1317NY | 功能描述:初级与次级侧 PWM 控制器 EZSWITCH PSR PWM Cont. w/ Int. MOSFET RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
| FSEZ1317WAMY | 功能描述:初级与次级侧 PWM 控制器 PSR PWM Controller w/MOSFET RoHS:否 制造商:ON Semiconductor 输出端数量:1 开关频率:250 KHz 工作电源电压:- 0.3 V to + 28 V 最大工作温度:+ 85 C 最小工作温度:- 5 C 封装 / 箱体:SOIC-8 Narrow 封装:Reel |
| FSEZ13X7 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Primary Side Regulated (PSR) Flyback Converter |
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