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參數(shù)資料
| 型號： | LTC1430CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 14-bit, 5V, 200KSPS, 8-Channel Unipolar ADC 24-SOIC 0 to 70 |
| 中文描述： | SWITCHING CONTROLLER, 260 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-16 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 211K |
| 代理商： | LTC1430CS |
11
LTC1430
pensation components. In general, a smaller value induc-
tor will improve transient response at the expense of ripple
and inductor core saturation rating. Minimizing output
capacitor ESR will also help optimize output transient
response. See Input and Output Capacitors for more
information.
Compensation and Transient Response
The LTC1430 voltage feedback loop is compensated at the
COMP pin; this is the output node of the internal g
m
error
amplifier. The loop can generally be compensated prop-
erly with an RC network from COMP to GND and an
additional small C from COMP to GND (Figure 8). Loop
stability is affected by inductor and output capacitor
values and by other factors. Optimum loop response can
be obtained by using a network analyzer to find the loop
poles and zeros; nearly as effective and a lot easier is to
empirically tweak the R
C
values until the transient recovery
looks right with an output load step. Table 1 shows
recommended compensation components for 5V to 3.3V
applications based on the inductor and output capacitor
values. The values were calculated using multiple paral-
leled 330
μ
F AVX TPS series surface mount tantalum
capacitors as the output capacitor.
Table 1. Recommended Compensation Network for 5V to 3.3V
Application Using Multiple 330
μ
F AVX Output Capacitors
L1 (
μ
H)
C
OUT
(
μ
F)
R
C
(k
)
1
990
1
1980
1
4950
1
9900
2.7
990
2.7
1980
2.7
4950
2.7
9900
5.6
990
5.6
1980
5.6
4950
5.6
9900
10
990
10
1980
10
4950
10
9900
180
C
C
(
μ
F)
0.022
0.01
0.0047
0.0022
0.01
0.0047
0.0022
0.001
0.0047
0.0022
820pF
470pF
0.0022
0.001
470pF
220pF
C1 (pF)
820
470
150
82
470
220
82
39
150
82
33
15
82
39
15
10
1.8
3.6
9.1
18
3.6
7.5
18
39
9.1
18
47
91
18
39
91
Output transient response is set by three major factors: the
time constant of the inductor and the output capacitor, the
more impact on overall transient recovery time than the
third; unless the loop compensation is way off, more
improvement can be had by optimizing the inductor and
the output capacitor than by fiddling with the loop com-
LTC1430
COMP
GND
SGND
LTC1430 F08
C1
C
C
R
C
Figure 8. Compensation Pin Hook-Up
Soft-Start and Current Limit
The 16-lead versions of the LTC1430 include a soft-start
circuit at the SS pin; this circuit is used both for initial start-
up and during current limit operation. The soft-start and
current limit circuitry is disabled in 8-lead versions. SS
requires an external capacitor to GND with the value
determined by the required soft-start time. An internal
12
μ
A current source is included to charge the external
capacitor. Soft-start functions by clamping the maximum
voltage that the COMP pin can swing to, thereby control-
ling the duty cycle (Figure 9). The LTC1430 will begin to
operate at low duty cycle as the SS pin rises to about 2V
below V
CC
. As SS continues to rise, the duty cycle will
increase until the error amplifier takes over and begins to
regulate the output. When SS reaches 1V below V
CC
the
LTC1430 will be in full operation. An internal switch shorts
the SS pin to GND during shutdown.
The LTC1430 detects the output current by watching the
voltage at I
FB
while M1 is ON. The I
LIM
amplifier compares
this voltage to the voltage at I
MAX
(Figure 10). In the ON
state, M1 has a known resistance; by calculating back-
wards, the voltage generated at I
FB
by the maximum
output current in M1 can be determined. As I
FB
falls below
I
MAX
, I
LIM
will begin to sink current from the soft-start pin,
APPLICATIU
W
U
U
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| LTC1430CS#PBF | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1430CS#TR | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1430CS#TRPBF | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1430CS60 | 制造商:LT 功能描述:* |
| LTC1430CS8 | 功能描述:IC SW REG CNTRLR STEP-DWN 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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