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參數(shù)資料
型號(hào): 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): 43/66頁
文件大小: 1264K
代理商: TPS53851RHHT
R2
R1
C2
C1
+
VREF
1
s × (R1+ R2) × C1+ 1
Gc(s) =
×
R1× C2
s × (s × R2 × C1+ 1)
Tv(s) = Gc(s) × Gvc(s)
p
1
f =
= 176.8kHz
2 × π × R2 × C1
z
1
f =
= 6kHz
2 × π × (R1+ R2) × C1
T v (j × 2 × π × fc) = 1
A
CM +
1
R1
C2
+ 3.978
105
SLUS985 – DECEMBER 2009
www.ti.com
Figure 6-1. Type II Compensator
The compensator transfer function is:
(50)
The loop gain transfer function is:
(51)
Assume the desired crossover frequency is 60 kHz, then set the compensator zero about 1/10 of the
crossover frequency and the compensator pole equal to the ESR zero. The compensator gain is then
calculated to achieve the desired bandwidth. In this design, the compensator gain, pole and zero are
selected as following:
(52)
(53)
(54)
From the above equation, the compensator gain is solved as 3.978×105.
(55)
where
C1 = 2.6 nF
C2 = 250 pF
R2 = 350
Set R1 equal to 10-k
, and then calculate all the other components
In the real laboratory practice, the final components are selected as following to increase the phase
margin and reduce PWM jitter.
R1 = 10 k
C2 = 330 pF
R2 = 50
C1 = 2.2 nF
6.1.7
Design Example Summary
Figure 6-2 shows the schematic of the dual output converter design.
48
DESIGN EXAMPLES
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS53851
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