参数资料
型号: TPS54260DRCR
厂商: Texas Instruments
文件页数: 18/52页
文件大小: 0K
描述: IC REG BUCK ADJ 2.5A 10SON
标准包装: 3,000
系列: SWIFT™, Eco-Mode™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.8 V ~ 58 V
输入电压: 3.5 V ~ 60 V
PWM 型: 电流模式
频率 - 开关: 100kHz ~ 2.5MHz
电流 - 输出: 2.5A
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: 10-VFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 10-SON 裸露焊盘(3x3)
SLVSA86A – MARCH 2010 – REVISED DECEMBER 2010
DETAILED DESCRIPTION (continued)
TPS54260
www.ti.com
EN
SS/TR
PWRGD
TPS54260
EN
VOUT 1
VOUT 2
R1
SS/ TR
R2
PWRGD
R3
R4
Figure 34. Schematic for Ratiometric and Simultaneous Start-Up Sequence
Ratio-metric and simultaneous power supply sequencing can be implemented by connecting the resistor network
of R1 and R2 shown in Figure 34 to the output of the power supply that needs to be tracked or another voltage
reference source. Using Equation 7 and Equation 8 , the tracking resistors can be calculated to initiate the Vout2
slightly before, after or at the same time as Vout1. Equation 9 is the voltage difference between Vout1 and Vout2
at the 95% of nominal output regulation.
The deltaV variable is zero volts for simultaneous sequencing. 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.
To design a ratio-metric start up in which the Vout2 voltage is slightly greater than the Vout1 voltage when Vout2
reaches regulation, use a negative number in Equation 7 through Equation 9 for deltaV. Equation 9 will result in a
positive number for applications which the Vout2 is slightly lower than Vout1 when Vout2 regulation is achieved.
Since the SS/TR pin must be pulled below 40mV before starting after an EN, UVLO or thermal shutdown fault,
careful selection of the tracking resistors is needed to ensure the device will restart after a fault. Make sure the
calculated R1 value from Equation 7 is greater than the value calculated in Equation 10 to ensure the device can
recover from a fault.
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 1.3V for a complete handoff to the internal voltage reference as shown in
R1 =
R2 =
Vout2 + deltaV Vssoffset
VREF Iss
VREF ′ R1
(7)
Vout2 + deltaV - VREF
deltaV = Vout1 - Vout2
R1 > 2800 ′ Vout1 - 180 ′ deltaV
(8)
(9)
(10)
18
Product Folder Link(s): TPS54260
Copyright ? 2010, Texas Instruments Incorporated
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