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参数资料
| 型号： | FSFR1800HSL |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC FPS HALF BRIDGE RES CONV 9SIP |
| 标准包装： | 19 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 47kHz ~ 53kHz |
| 输入电压： | 9.6 V ~ 25 V |
| 输出电压： | 500V |
| 功率（瓦特）： | 260W |
| 工作温度： | -40°C ~ 130°C |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
Functional Description
1. Basic Operation: FSFR-HS series is designed to drive
high-side and low-side MOSFETs complementarily with
50% duty cycle. A fixed dead time of 350 ns is introduced
Assuming the saturation voltage of opto-coupler
transistor is 0.2 V, the maximum switching frequency is
determined as:
between consecutive transitions, as shown in Figure 18.
Once LV CC is higher than LV CC,START = 12.5 V, the IC
starts to operate, generates the low-side gate signal, and
f max =
1
792 p × R min || R max + 0 . 54 μ
[ Hz ]
(2)
drives the low-side MOSFET. The bootstrap diode and
capacitor is charged by
the low-side MOSFET’s
operation. After the voltage on HV CC increases up to
HV CC,START , typically 9.2 V, the high-side gate signal is
generated for the MOSFET.
Figure 18. MOSFET Gate Drive Signals
2. Internal Oscillator: FSFR-HS series employs a
current-controlled oscillator, as shown in Figure 19.
Internally, the voltage of the RT pin is regulated at 2 V
and the charging / discharging current for the oscillator
capacitor, C T , is obtained by copying the current flowing
out of the RT pin (I CTC ) using a current mirror. Therefore,
the switching frequency increases as I CTC increases.
Figure 19. Current-Controlled Oscillator
3. Frequency Setting: Figure 20 shows the typical
voltage gain curve of a resonant converter, where the
gain is inversely proportional to the switching frequency
in the ZVS region. The output voltage can be regulated
by modulating the switching frequency. Figure 21 shows
the typical circuit configuration for the RT pin, where the
opto-coupler transistor is connected to the RT pin to
modulate the switching frequency. The switching
frequency may be controlled from 20 kHz to 500 kHz.
The minimum switching frequency is determined as:
Figure 20. Resonant Converter Typical Gain Curve
Figure 21. Frequency Control Circuit
To prevent excessive inrush current and overshoot of
output voltage during startup, the IC needs to increase
the voltage gain of the resonant converter progressively.
Since the voltage gain of the resonant converter is
inversely proportional to the switching frequency, soft-
start is implemented by sweeping down the switching
frequency from an initial high frequency ( f I S S ) until the
output voltage is established.
f min =
1
792 p × R min + 0 . 54 μ
[ Hz ]
(1)
The soft-start circuit is constructed by connecting R-C
series network to the RT pin, as shown in Figure 21.
Initially, the operating frequency is set by the parallel
impedance of R SS and R min .
? 2011 Fairchild Semiconductor Corporation
FSFR1800 / FSFR1700-HS ? Rev.1.0.1
10
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSFR1800L | 功能描述:功率驱动器IC HIGH POWER FPS RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FSFR1800S | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FSFR1800US | 功能描述:电源开关 IC - 配电 HIGH POWER FPS 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 |
| FSFR1800USL | 功能描述:电源开关 IC - 配电 260W Powr Switch for Half Brdg Res Cnvtr 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 |
| FSFR1800XS | 功能描述:功率驱动器IC 260W Fairchild PwrSW RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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