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| 型號： | TPS54622RHLT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 15 A SWITCHING REGULATOR, 1760 kHz SWITCHING FREQ-MAX, PQCC14 |
| 封裝： | 3.50 X 3.50 MM, GREEN, PLASTIC, QFN-14 |
| 文件頁數(shù)： | 10/36頁 |
| 文件大小： | 1190K |
| 代理商： | TPS54622RHLT |
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VOUT
RESR
CO
R L
VC
gm ps
VOUT
RESR
CO
RL
VC
gm ps
fp
fz
Adc
s
1+
2
z
VOUT
= Adc
VC
s
1+
2
p
÷
è
÷
è
p
ps
L
Adc = gm
R
O
L
1
p =
C
R
2
p
O
ESR
1
z =
C
R
2
p
SLVSA70
– MARCH 2011
Figure 26. Simplified Small Signal Model for Peak Current Mode Control
Figure 27. Simplified Frequency Response for Peak Current Mode Control
(10)
(11)
(12)
(13)
Where
gmea is the GM amplifier gain ( 1300μA/V)
gmps is the power stage gain (16A/V).
RL is the load resistance
CO is the output capacitance.
RESR is the equivalent series resistance of the output capacitor.
Small Signal Model for Frequency Compensation
The device uses a transconductance amplifier for the error amplifier and readily supports two of the commonly
used Type II compensation circuits and a Type III frequency compensation circuit, as shown in Figure 28. In
Type 2A, one additional high frequency pole, C6, is added to attenuate high frequency noise. In Type III, one
additional capacitor, C11, is added to provide a phase boost at the crossover frequency. See Designing Type III
Compensation for Current Mode Step-Down Converters (SLVA352) for a complete explanation of Type III
compensation.
18
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS54622
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