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參數(shù)資料
型號: TPS53851RHHT
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: SWITCHING CONTROLLER, PQCC36
封裝: PLASTIC, VQFN-36
文件頁數(shù): 20/66頁
文件大小: 1264K
代理商: TPS53851RHHT
ILIMx
VSHARE
TPS53851
R1
VOUT
R2
UDG-09143
a +
V
RAMP
V
IN
b + DCR
A
C
I
PEAK )
V
RAMP
2
Nph
R1 +
b ) a
V
SH
(1 * a)
I
LIM
R2 +
b ) a
V
SH
a
I
LIM
www.ti.com
SLUS985 – DECEMBER 2009
Figure 5-10. Selecting Overcurrent Threshold Resistors, R2 and R1
The two factors, alpha and beta help simplify the final equations and are given by Equation 12 and
(12)
(13)
R1 is shown in Equation 14.
(14)
R2 is shown in Equation 15.
(15)
where (for Equation 12 through Equation 15)
VRAMP is the ramp amplitude (0.5 V typ)
VIN is the input voltage
DCR is the inductor equivalent DC resistance
AC is the gain transfer to comparator
IOC is the single-phase DC overcurrent trip point
IPEAK is the peak single-phase inductor current
Nph is 6 if PHSEL voltage = 1.6 V ±0.2 V, otherwise Nph = 8
VSHR is the VSHARE reference voltage (typ 1.8 V)
ILIM is the current limit, output current (typ 20 μA)
(1)
Range of variable is specified in
Copyright 2009, Texas Instruments Incorporated
APPLICATION INFORMATION
27
Product Folder Link(s): TPS53851
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