- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385505 > LTC1704B (Linear Technology Corporation) Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70 PDF資料下載
參數(shù)資料
| 型號： | LTC1704B |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70 |
| 中文描述： | 550kHz的同步開關(guān)穩(wěn)壓器控制器加線性穩(wěn)壓控制器 |
| 文件頁數(shù)： | 20/28頁 |
| 文件大?。?/td> | 343K |
| 代理商： | LTC1704B |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當(dāng)前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
LTC1704/LTC1704B
20
1704bfa
APPLICATIU
W
U
U
Feedback Component Selection
Selecting the R and C values for a typical Type 2 or Type
3 loop is a nontrivial task. The applications shown in this
data sheet show typical values, optimized for the power
components shown. They should give acceptable perfor-
mance with similar power components, but can be way
off if even one major power component is changed
significantly. Applications that require optimized tran-
sient response will need to recalculate the compensation
values specifically for the circuit in question. The under-
lying mathematics are complex, but the component
values can be calculated in a straightforward manner if
we know the gain and phase of the modulator at the
crossover frequency.
Modulator gain and phase can be measured directly from
a breadboard, or can be simulated if the appropriate para-
sitic values are known. Measurement will give more accu-
rate results, but simulation can often get close enough to
give a working system. To measure the modulator gain and
phase directly, wire up a breadboard with an LTC1704 and
the actual MOSFETs, inductor, and input and output capaci-
tors that the final design will use. This breadboard should
use appropriate construction techniques for high speed
analog circuitry: bypass capacitors located close to the
LTC1704, no long wires connecting components, appro-
priately sized ground returns, etc. Wire the feedback am-
plifier as a simple Type 1 loop, with a 10k resistor from
V
OUTSW
to FB and a 0.1
μ
F feedback capacitor from COMP
to FB. Choose the bias resistor (R2) as required to set the
desired output voltage. Disconnect R2
from ground and
connect it to a signal generator or to the source output of
a network analyzer (Figure 11) to inject a test signal into the
loop. Measure the gain and phase from the COMP pin to
the output node at the positive terminal of the output ca-
pacitor. Make sure the analyzer’s input is AC coupled so that
the DC voltages present at both the COMP and V
OUTSW
nodes don’t corrupt the measurements or damage the
analyzer.
Figure 11. Modulator Gain/Phase Measurement Setup
BOOST
1
μ
F
0.1
μ
F
MBR0530T
TG
SW
BG
PGND
PV
CC
GND
V
CC
10
AC SOURCE
FROM
ANALYZER
LTC1704
10
μ
F
QB
L
+
C
OUT
1704 F11
V
TO
ANALYZER
V
COMP
TO
ANALYZER
R2
5V
+
RUN/SS
NC
QT
FB
COMP
10k
Figure 9. Type 2 Schematic and Transfer Function
Figure 10. Type 3 Schematic and Transfer Function
G
1704 F10
0
PHASE
–6dB/OCT
+6dB/OCT
–6dB/OCT
GAIN
P
FREQ
–90
–180
–270
–360
R2
V
REF
R1
R4
FB
C2
IN
COMP
+
–
C1
C3
R3
G
1704 F09
0
PHASE
–6dB/OCT
–6dB/OCT
GAIN
P
FREQ
–90
–180
–270
–360
R2
V
REF
R1
R4
FB
C2
IN
COMP
+
–
C1
If breadboard measurement is not practical, a SPICE
simulation can be used to generate approximate gain/
phase curves. Plug the expected capacitor, inductor and
MOSFET values into the following SPICE deck and gener-
ate an AC plot of V(V
OUTSW
)/V(COMP) in dB and phase of
V(OUTSW) in degrees. Refer to your SPICE manual for
details of how to generate this plot.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1705 | Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO |
| LTC1705EGN | Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO |
| LTC1710 | Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70 |
| LTC1710C | Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70 |
| LTC1710CMS8 | Dual 16-By-4 Register Files 24-SOIC 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1704BEGN | 功能描述:IC REG DL BUCK/LINEAR 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LTC1704BEGN#PBF | 功能描述:IC REG DL BUCK/LINEAR 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LTC1704BEGN#TR | 功能描述:IC REG DL BUCK/LINEAR 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LTC1704BEGN#TRPBF | 功能描述:IC REG DL BUCK/LINEAR 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| LTC1704EGN | 功能描述:IC REG DL BUCK/LINEAR 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。