参数资料
型号: TPS54478RTET
厂商: Texas Instruments
文件页数: 14/38页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 4A 16WQFN
标准包装: 1
系列: SWIFT™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 4.5 V
输入电压: 2.95 V ~ 6 V
PWM 型: 电流模式
频率 - 开关: 500kHz
电流 - 输出: 4A
同步整流器:
工作温度: -40°C ~ 150°C
安装类型: 表面贴装
封装/外壳: 16-WFQFN 裸露焊盘
包装: 标准包装
供应商设备封装: 16-WQFN 裸露焊盘(3x3)
其它名称: 296-29064-6
SLVSAS2 – JUNE 2011
TPS54478
EN1
EN1
SS/TR1
Io
Vo1
PWRGD1
Vo2
TPS54478
EN2
SS/TR2
PWRGD2
Figure 25. Schematic for Ratio-metric Start-Up
t - Time = 1 ms/div
Figure 26. Ratio-metric Startup
Sequence
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Simultaneous power supply sequencing can be implemented by connecting the resistor network of R1 and R2
shown in Figure 27 to the output of the power supply that needs to be tracked or another voltage reference
source. Using Equation 5 and Equation 6 , the tracking resistors can be calculated. To minimize the effect of the
inherent SS/TR to VSENSE offset (Vssoffset) in the slow start circuit and the offset created by the pullup current
source (Iss) and tracking resistors, the Vssoffset and Iss are included as variables in the equations. As the
SS/TR voltage becomes more than 85% of the nominal reference voltage the Vssoffset becomes larger as the
slow start circuits gradually handoff the regulation reference to the internal voltage reference. The SS/TR pin
voltage needs to be greater than 0.86 V for a complete handoff to the internal voltage reference as shown in
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R1 =
Vout2 Vssoffset
Vref Iss
(5)
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R2 =
Vref ′ R1
Vout2 - Vref
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14
(6)
Copyright ? 2011, Texas Instruments Incorporated
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