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參數(shù)資料
| 型號： | ISL6740 |
| 廠商： | Intersil Corporation |
| 英文描述： | Flexible Double Ended Voltage and Current Mode PWM Controllers |
| 中文描述： | 靈活的雙端電壓和電流模式PWM控制器 |
| 文件頁數(shù)： | 23/29頁 |
| 文件大小： | 639K |
| 代理商： | ISL6740 |
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23
A block diagram of the feedback control loop follows in
Figure 19.
The loop compensation is placed around the Error Amplifier
(EA) on the secondary side of the converter. A Type 3 error
amplifier configuration was selected.
The control to output transfer function may be represented
as [1]
s
ω
o
where
R
o
= Output Load Resistance
L = Output Inductance
C = Output Capacitance
R
c
= Output Capacitance ESR
V
S
= Sawtooth Ramp Amplitude
Gain and phase plots of (EQ. 26) appear below using L =
4.0
μ
H, C = 150
μ
F, Rc = 28m
, Ro = 1.2
, and Vin = 75V.
The Type 3 compensation configuration has three poles and
two zeros. The first pole is at the origin, and provides the
integration characteristic which results in excellent DC
regulation. Referring to the Typical Application Schematic for
the regulated output, the remaining poles and zeros for the
compensator are located at:
From (EQ. 26), it can be seen that the control to output
transfer function frequency dependence is a function of the
output load resistance, the value of output capacitor and
inductor, and the output capacitance ESR. These variations
must be considered when compensating the control loop.
The worst case small signal operating point for a voltage
mode converter tends to be at maximum Vin, maximum load,
maximum Cout, and minimum ESR.
FIGURE 19. CONTROL LOOP BLOCK DIAGRAM
PWM
POWER
STAGE
Z
1
Z
2
REF
+
-
ISOLATION
ERROR AMPLIFIER
V
OUT
FIGURE 20. TYPE 3 ERROR AMPLIFIER
REF
+
-
V
OUT
V
ERR
v
o
v
c
-----
V
S
2
----------------
N
S
N
P
-------
1
------
+
1
----------------
s
ω
o
------
2
+
+
-------------------------------------------------
=
(EQ. 26)
Q
R
o
L
---------------
=
ω
o
LC
-----------
=
or
f
o
2
π
LC
-------------------
=
ω
z
c
C
-----------
=
or
f
z
c
C
------------------
=
FIGURE 21A. CONTROL-TO-OUTPUT GAIN
10
100
110
6
-20
-10
0
10
20
30
40
FREQUENCY (Hz)
G
110
5
110
4
110
3
FIGURE 21B. CONTROL-TO-OUTPUT PHASE
10
100
110
6
-200
-150
-100
-50
0
50
FREQUENCY (Hz)
P
110
5
110
4
110
3
f
p2
----------------------------------------
=
(EQ. 27)
f
p3
-------------------------------------
≈
C19
C20
(EQ. 28)
f
z1
----------------------------------------
=
(EQ. 29)
f
z2
----------------------------------------
≈
R23
R4
(EQ. 30)
ISL6740, ISL6741
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6740IB | Flexible Double Ended Voltage and Current Mode PWM Controllers |
| ISL6740IV | Octal Buffers/Drivers With 3-State Outputs 20-SSOP -40 to 85 |
| ISL6741 | Flexible Double Ended Voltage and Current Mode PWM Controllers(靈活的雙端電壓和電流模式PWM控制器) |
| ISL6845IB | Improved Industry Standard Single Ended Current Mode PWM Controller |
| ISL6845 | Improved Industry Standard Single Ended Current Mode PWM Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6740AIVZA | 功能描述:IC REG CTRLR PWM VM 16-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 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:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6740AIVZA-T | 功能描述:IC REG CTRLR PWM VM 16-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 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:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6740EVAL1 | 功能描述:EVALUATION BOARD 1 ISL6740 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6740EVAL2 | 功能描述:EVALUATION BOARD 2 ISL6740 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時(shí)/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ISL6740EVAL2Z | 功能描述:EVALUATION BOARD 2 ISL6740 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):升壓 頻率 - 開關(guān):3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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