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參數(shù)資料
| 型號： | ISL6741IV |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Flexible Double Ended Voltage and Current Mode PWM Controllers |
| 中文描述： | 0.5 A SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, MO-153-AB, TSSOP-16 |
| 文件頁數(shù)： | 20/29頁 |
| 文件大?。?/td> | 639K |
| 代理商： | ISL6741IV |
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20
formed by R13 and R15 determines the percent of maximum
duty cycle that corresponds to a short circuit. The divider
ratio formed by R13 and R15 is
Therefore, the duty cycle that corresponds to a short circuit
is 6.8% of D max (97.9%), or ~6.6%.
Performance
The major performance criteria for the converter are
efficiency, and to a lesser extent, load regulation. Efficiency,
load regulation and line regulation performance are
demonstrated in the following Figures.
As expected, the output voltage varies considerably with line
and load when compared to an equivalent converter with
closed loop feedback. However, for applications where tight
regulation is not required, such as those application that use
downstream DC-DC converters, this design approach is
viable.
Waveforms
Typical waveforms can be found in the following Figures.
Figure 13 shows the output voltage during start up.
Figure 14 shows the output voltage ripple and noise at a 5A
load.
Figures 15 and 16 show the voltage waveforms at the
switching node shared by the upper FET source and the lower
FET drain. In particular, Figure 16 shows near ZVS operation
at 8A of load when the upper FET is turning off and the lower
FET turning on. There is insufficient energy stored in the
leakage inductance to allow complete ZVS operation.
However, since the energy stored in the node capacitance is
proportional to V
2
, a significant portion of the energy is still
recovered. Figure 17 shows the switching transition between
outputs, OUTA and OUTB during steady state operation. The
deadtime duration of 48.6ns is clearly shown.
R15
-------------+
17.4k
---------------+
0.068
=
=
(EQ. 24)
FIGURE 10. EFFICIENCY vs LOAD V
IN
= 48V
t
LOAD CURRENT (A)
E
100
95
90
85
80
75
70
0
1
2
3
4
5
6
7
8
9
FIGURE 11. LOAD REGULATION AT V
IN
= 48V
LOAD CURRENT (A)
O
12.5
12.25
12
11.75
11.5
11.25
110
1
2
3
4
5
6
7
8
9
FIGURE 12. LINE REGULATION AT I
OUT
= 1A
INPUT VOLTAGE (V)
45
46
47
48
49
50
51
52
53
54
14
13.5
13
12.5
12
11.5
11
O
FIGURE 13. OUTPUT SOFT START
FIGURE 14. OUTPUT RIPPLE AND NOISE - 20MHz BW
ISL6740, ISL6741
相關PDF資料 |
PDF描述 |
|---|---|
| ISL6740 | Flexible Double Ended Voltage and Current Mode PWM Controllers |
| 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 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6741IV-T | 功能描述:IC REG CTRLR PWM CM 16-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產品目錄頁面:1316 (CN2011-ZH PDF) |
| ISL6741IVZ | 功能描述:IC REG CTRLR PWM CM 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:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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) |
| ISL6741IVZ-T | 功能描述:IC REG CTRLR PWM CM 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:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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) |
| ISL6742AAZA | 功能描述:IC REG CTRLR PWM CM/VM 16-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:75 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.3 V ~ 13.5 V 降壓:是 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:0°C ~ 70°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:管件 產品目錄頁面:1051 (CN2011-ZH PDF) 其它名稱:296-2543-5 |
| ISL6742AAZA-T | 功能描述:IC REG CTRLR PWM CM/VM 16-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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) |
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