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參數(shù)資料
| 型號： | LTC1696 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Synchronous Dual Mode Phase Modulated Full Bridge Controllers |
| 中文描述： | 同步相位調(diào)制的雙模式全橋控制器 |
| 文件頁數(shù)： | 23/28頁 |
| 文件大?。?/td> | 319K |
| 代理商： | LTC1696 |
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LTC3722-1/LTC3722-2
23
372212i
F
P1(MIN)
= 1/(2
π
R
O(MAX)
C
O
)
F
P1(MAX)
= 1/(2
π
R
O(MIN)
C
O
)
Step 2. Calculate ESR zero location:
F
Z1
= 1/(2
π
R
ESR
C
O
)
Step 3. Calculate the feedback divider gain:
R
B
/(R
B
+ R
T
) or V
REF
/V
OUT
If Polymer electrolytic output capacitors are used, the ESR
zero can be employed in the overall loop compensation
and optimum bandwidth can be achieved. If aluminum
electrolytics are used, the loop will need to be rolled off
prior to the ESR zero frequency, making the loop response
slower. A linearized SPICE macromodel of the control loop
is very helpful tool to quickly evaluate the frequency
response of various compensation networks.
+
–
2.5V
R
f
R
L
R
D
ESR
REF
R
I
C
C
C
O
C
P2
V
OUT
COLL
COMP
OPTO
V
OUT
LT1431 OR EQUIVALENT
PRECISION ERROR
AMP AND REFERENCE
OPTIONAL
1922 F12
Figure 13. Compensation for Polymer Electrolytic
OPERATIOU
Polymer Electrolytic
(see Figure 13) 1/(2
π
C
C
R
I
) sets a
low
frequency pole. 1/(2
π
C
C
R
F
) sets the low frequency
zero. The zero frequency should coincide with the worst-
case lowest output pole frequency. The pole frequency
and mid frequency gain (R
F
/R
I
) should be set such so that
the loop crosses over zero dB with a –1 slope at a
frequency lower than (f
SW
/8). Use a bode plot to graphi-
cally display the frequency response. An optional higher
frequency pole set by CP2 and R
f
is used to attenuate
switching frequency noise.
Aluminum Electrolytic
(see Figure 13) the goal of this
compensator will be to cross over the output minimum
pole frequency. Set a low frequency pole with C
C
and R
IN
at a frequency that will cross over the loop at the output
pole minimum F, place the zero formed by C
C
and R
f
at the
output pole F.
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| LTC1696ES6#TR | 功能描述:IC OVERVOLT PROT CTRLR SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
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