参数资料
型号: TPS65250RHAR
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: 4 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PQCC40
封装: 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40
文件页数: 11/38页
文件大小: 1782K
代理商: TPS65250RHAR
Current Sense
I/V Gain
V
.
V
ref
8
0
=
o
V
L
i
ESR
R
1
R
2
R
c
R
o
C
c
C
Roll
C
ff
C
L
R
u
g M
130
=
COMPx
FBx
Gm=10A/V
2
C
M
ps
fc Vo Co
R
g
Vref gm
p ×
×
=
×
1
2
O
L
fp
C
R
p
=
×
3
L
C
R Co
C
R
×
=
Re
2
3
sr Co
C
R
×
=
www.ti.com
SLVSAA3B – JUNE 2010 – REVISED JANUARY 2011
Figure 32. Loop Compensation
The design guidelines for TPS65250 loop compensation are as follows:
1. Set up cross over frequency fc.
2. RC can be determined by:
(4)
Where is the GM amplifier gain (130 A/V), is the power stage gain (10 A/V).
3. Place a compensation zero at the dominant pole,
(5)
CC can be determined by:
(6)
4. C2 is optional. It can be used to cancel the zero from Co’s ESR.
(7)
In some applications the transient response performance is the primary goal, a type-III compensation circuit
allows the system having one more zero. The additional zero provides extra phase margin and the system can
achieve an extra high crossover frequency. C3 can be added at the upper leg of the output divider to form a zero
with R1.
Copyright 2010–2011, Texas Instruments Incorporated
19
Product Folder Link(s): TPS65250
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