參數(shù)資料
型號(hào)： TPS40091RHDRG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28
封裝： GREEN, PLASTIC, QFN-28
文件頁(yè)數(shù)： 8/31頁(yè)
文件大?。?/td> 881K
代理商： TPS40091RHDRG4
www.ti.com
F
DROOPZ +
1
2p
V
DROOP
I
OUT(max)
C
OUT
(12)
C2 +
C1
2p
R2
C1
F
DROOPZ * 1
(13)
GAIN AND PHASE
vs
FREQUENCY
G
-
Gain
-
dB
Phase
-
°
f - Frequency - Hz
60
0
10
20
40
50
30
-20
-10
0
60
80
20
40
-20
100
1 k
10 k
100 k
1 M
Phase
Gain
VIN = 12 V
VOUT = 1.5 V
IOUT= 100 A
SLUS578B – OCTOBER 2003 – REVISED MAY 2006
APPLICATION INFORMATION (continued)
The droop function, as well as the output capacitor ESR, introduces zero on some frequency left of the
crossover point.
To compensate for this zero, pole on the same frequency should be added to the error amplifier transfer
function. With Type II compensation network a new value for the capacitor C2 is required compared to the case
without droop.
When attempting to close the feedback loop at frequency that is near the theoretical limit, use the above
considerations as a first approximation and perform on bench measurements of closed loop parameters as
effects of switching frequency proximity and finite bandwidth of voltage and current amplifiers may substantially
alter them as it is shown in Figure 9.
Figure 9.
16
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