参数资料
型号: FAN7554
厂商: Fairchild Semiconductor
文件页数: 11/22页
文件大小: 0K
描述: IC REG CTRLR FLYBK ISO PWM 8-DIP
标准包装: 50
PWM 型: 电流模式
输出数: 1
频率 - 最大: 500kHz
占空比: 98%
电源电压: 9 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -25°C ~ 85°C
封装/外壳: 8-DIP(0.300",7.62mm)
包装: 管件
产品目录页面: 1222 (CN2011-ZH PDF)
其它名称: FAN7554_NL
FAN7554_NL-ND
FAN7554
Vfb
6V
Slope (dv/dt) = 5uA / Cfb
Shutdown start point
3V
t1
t2
t
Figure 17 - B . Delayed Shutdown & Feedback Waveform
Gate Driver
The gate drive circuit has the totem-pole output configuration. The output has 1A peak current and 200mA average current
drive ability.
Clock
7
OUT
DRAIN
Q
6
Shutdown
FAN7554
Figure 18. Gate Drive Circuit
ON/OFF Control
The FAN7554 is able to use the feedback pin for ON/OFF control by placing NPN transistor between the cathode of the
KA431 and ground as shown in figure 19. When the transistor turns on, the current flows through the photo diode and
saturates the photo transistor. As a result, the feedback voltage is dropped to zero. When the feedback voltage is below 0.3V,
the soft start voltage starts to discharge by connecting the internal resistor 1k ? in parallel with the external capacitor Cs. When
the soft start voltage becomes less than 1.5V, all the blocks in the FAN7554 are turned off , with the exceptions of the UVLO
block and ON/OFF control block. The operation current is about 200uA. So the stand-by power is reduced and SMPS
efficiency is improved. When the feedback voltage exceeds 0.3V, the FAN7554 normally operates by turning on Vref block.
11
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相关代理商/技术参数
参数描述
FAN7554_03 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Versatile PWM Controller
FAN7554D 功能描述:DC/DC 开关控制器 PWM Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK
FAN7554D_Q 功能描述:电流型 PWM 控制器 PWM Controller 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
FAN7554DTF 功能描述:DC/DC 开关控制器 PWM Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK
FAN7554DTF_Q 功能描述:电流型 PWM 控制器 PWM Controller 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