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參數(shù)資料
| 型號： | RT8100AGQV |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Synchronous buck PWM DC/DC with Dual Voltage Control Mode |
| 中文描述： | 同步降壓PWM直流/雙直流電壓控制模式 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 434K |
| 代理商： | RT8100AGQV |
RT8100A
80
80
Preliminary
14
DS8100A-01 August 2007
www.richtek.com
Protection
OCP
The RT8100A use cycle by cycle current comparison. The
over current level is set by R
CSN
resistor. When OC function
occurs and SS > (5VSB
1.3), a constant current of 10
μ
A
starts to discharge the capacitor connected to SS pin right
away. When OC occurs UGATE and LGATE will be off.
When the voltage at the capacitor connected to SS pin
pass about 0.4V, a constant current of 10
μ
A starts to charge
the capacitor.
Figure 8. Type 2 Bode Plot
10 100 1k 10k 100k 1M
Frequency (Hz)
-40
0
40
-60
40
0
20
60
-20
-40
-60
Loop Gain
Compensation
Gain
Modulator
Gain
G
There is another type of compensation called Type 3
compensation that adds a pole-zero pair to the Type 2
network. It's used to compensate output capacitor whose
ESR value is much lower (pure MLCC or OSCON
Capacitors).
As shown in Figure 9, to insert a network between V
OUT
and FB in the original Type 2 compensation network can
result in Type 3 compensation. Figure 10 shows the
difference of their AC response. Type 3 compensation has
an additional pole-zero pair that causes a gain boost at
the flat gain region. But the gain boosted is limited by the
ratio (R1+R4)/R4; if R3 << R4.
+
-
GM
V
COMP
C2
R2
C1
R4
V
OUT
R1
R3
C3
FB
Figure 9. Additional Network of Type 3 Compensation
(Add between V
OUT
and FB)
Figure 10. AC Response Curves of Type 2 and 3
Pole
F
P2
F
Z2
Add Type 3 compensation
Original Type 3 compensation
F
P1
F
Z1
F
P3
Type 3 will induce three poles and two zeros.
Zeros :
C3
R3)
R1
(
2
1
+
F
C2
R2
2
1
F
Z2
Z1
×
×
=
×
×
=
π
π
;
R3
R1
C1
R3
+
R1
2
1
×
F
C3
R3
2
1
F
C2
C1
C2
C1
R2
2
1
F
P3
P2
P1
×
×
=
×
×
=
+
×
×
×
=
π
π
π
Poles :
which is in the origin.
We recommend F
Z1
placed in 0.5 x F
P(LC)
; F
Z2
placed in
F
P(LC)
; F
P1
placed in F
ESR
and F
P2
placed in 0.5 x F
SW
.
Figure 11 shows Type 3 Bode Plot.
Figure 11. Type 3 Bode Plot
Loop Gain
-80
-60
-40
-20
0
20
40
60
2
3
4
5
6
7
Log Frequency
d
Compensation Gain
Gain
Modulator Gain
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| RT8100APQV | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Synchronous buck PWM DC/DC with Dual Voltage Control Mode |
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