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參數(shù)資料
| 型號： | LTC3830EGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation |
| 中文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 305K |
| 代理商： | LTC3830EGN |
17
LTC3830/LTC3830-1
sn3830 3830fs
APPLICATIOU
Figure 10b shows the Bode plot of the overall transfer
function.
When low ESR output capacitors (Sanyo OS-CON) are
used, the ESR zero can be high enough in frequency that
it provides little phase boost at the loop crossover fre-
quency. As a result, the phase margin becomes inad-
equate and the load transient is not optimized. To resolve
this problem, a small capacitor can be connected between
the top of the resistor divider network and the V
FB
pin to
create a pole-zero pair in the loop compensation. The zero
location is prior to the pole location and thus, phase lead
can be added to boost the phase margin at the loop
crossover frequency. The pole and zero locations are
located at:
f
ZC2
= 1/[2
π
(R2)(C2)] and
f
PC2
= 1/[2
π
(R1||R2)(C2)]
where R1||R2 is the parallel combination resistance of R1
and R2. Choose C2 so that the zero is located at a lower
frequency compared to f
CO
and the pole location is high
enough that the closed loop has enough phase margin for
stability. Figure 10c shows the Bode plot using phase
lead compensation around the LTC3830 resistor divider
network.
Note: This technique is effective only when
R1>>R2 i.e., at high output voltages only so that the pole
and zero are sufficiently separated.
W
U
U
Although a mathematical approach to frequency compen-
sation can be used, the added complication of input and/or
output filters, unknown capacitor ESR, and gross operat-
ing point changes with input voltage, load current varia-
tions, all suggest a more practical empirical method. This
can be done by injecting a transient current at the load and
using an RC network box to iterate toward the final values,
or by obtaining the optimum loop response using a
network analyzer to find the actual loop poles and zeros.
Table 2 shows the suggested compensation component
value for 5V to 3.3V applications based on Sanyo OS-CON
4SP820M low ESR output capacitors.
Table 2. Recommended Compensation Network for 5V to 3.3V
Applications Using Multiple Paralleled 820
μ
F Sanyo OS-CON
4SP820M Output Capacitors
L1 (
μ
H)
C
OUT
(
μ
F)
R
C
(k
)
1.2
1640
6.2
1.2
2460
12
1.2
4100
12
2.4
1640
15
2.4
2460
20
2.4
4100
36
4.7
1640
30
4.7
2460
36
4.7
4100
82
C
C
(nF)
3.3
3.3
1.8
2.7
1.0
1.0
1.8
1.0
1.0
C1 (pF)
470
470
220
330
220
220
330
180
180
C2 (pF)
1000
1000
1000
1000
1000
1000
1000
1000
1000
L
L
3830 F10b
3830 F10c
f
Z
f
Z
f
LC
f
LC
f
ZC2
f
CO
f
P
f
PC2
f
ESR
f
ESR
f
CO
f
P
FREQUENCY
FREQUENCY
20dB/DECADE
20dB/DECADE
f
SW
= LTC3830 SWITCHING
FREQUENCY
f
CO
= CLOSED-LOOP CROSSOVER
FREQUENCY
f
SW
= LTC3830 SWITCHING
FREQUENCY
f
CO
= CLOSED-LOOP CROSSOVER
FREQUENCY
Figure 10b. Bode Plot of the LTC3830 Overall Transfer Function
Figure 10c. Bode Plot of the LTC3830 Overall
Transfer Function Using a Low ESR Output Capacitor
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PDF描述 |
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| LTC3830-1ES8 | 16-Bit Bus Transceiver With 3-State Outputs 56-BGA MICROSTAR JUNIOR -40 to 85 |
| LTC3830ES | 16-Bit Bus Transceiver With 3-State Outputs 54-BGA MICROSTAR JUNIOR -40 to 85 |
| LTC3830ES8 | 16-Bit Bus Transceiver With 3-State Outputs 48-TSSOP -40 to 85 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3830EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LTC3830EGN#TR | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3830EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3830ES | 功能描述:IC REG CTRLR BUCK PWM VM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LTC3830ES#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
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