參數(shù)資料
型號(hào): TPS54521RHLT
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: SWITCHING REGULATOR, PQCC14
封裝: GREEN, PLASTIC, QFN-14
文件頁(yè)數(shù): 9/40頁(yè)
文件大?。?/td> 1194K
代理商: TPS54521RHLT
D
V out2 +
V
V ssoffset
R1 =
V ref
Iss
D
-
Vref
R1
R2 =
Vout2 +
V
Vref
V = Vout1
Vout 2
D
-
>
-
D
R1
2800
Vout1 180
V
SS/TR
TPS54521
EN
PWRGD
SS/TR
TPS54521
EN
PWRGD
VOUT1
VOUT 2
R1
R2
R3
R4
Time = 2 msec / div
EN = 2 V / div
Vout1 = 1 V / div
Vout2 = 1 V / div
www.ti.com
SLVS981A – JUNE 2010 – REVISED AUGUST 2010
The deltaV variable is zero volts for simultaneous sequencing. To minimize the effect of the inherent SS/TR to
VSENSE offset (Vssoffset, 29mV) in the slow start circuit and the offset created by the pull-up current source
(Iss, 2.3mA) and tracking resistors, the Vssoffset and Iss are included as variables in the equations. Figure 29
shows the result when deltaV = 0V.
To ensure proper operation of the device, the calculated R1 value from Equation 6 must be greater than the
value calculated in Equation 9.
(6)
(7)
(8)
(9)
Figure 26. Ratiometric and Simultaneous Startup Sequence
Figure 27. Ratio-metric Startup with Vout1 Leading Vout2
Copyright 2010, Texas Instruments Incorporated
17
Product Folder Link(s) :TPS54521
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