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参数资料
| 型号： | ISL6744EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD ISL6744 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 功率 - 输出： | 100W |
| 输出电压： | 12V |
| 电流 - 输出： | 8A |
| 输入电压： | 43.2 ~ 52.8V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 235kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL6744 |
ISL6744
based on the nature of the intended load, multiple buck
regulators. To minimize the output impedance of the filter, a
SANYO OSCON 16SH150M capacitor in parallel with a
22 μ F ceramic capacitor were selected.
Current Limit Threshold
The current limit threshold is fixed at 0.6V nominal, which is
the reference to the overcurrent protection comparator. The
current level that corresponds to the overcurrent threshold
must be chosen to allow for the dynamic behavior of an open
loop converter. In particular, the low inductor ripple current
under steady state operation increases significantly as the
duty cycle decreases.
14
13
12
11
10
9
8
reduction of the average current through the inductor. The
implication is that the converter can not supply the same
output current in current limit that it can supply under steady
state conditions. The peak current limit setpoint must take
this behavior into consideration. A 5.11 Ω current sense
resistor was selected for the rectified secondary of current
transformer T2 for the ISL6744Eval 1, corresponding to a
peak current limit setpoint of about 11A.
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 a
closed loop feedback. However, for applications where tight
regulation is not required, such as those applications that
use downstream DC/DC converters, this design approach is
viable.
100
95
90
0.9950
0.9960
0.9970
0.9980
0.9990
1.000
TIME (ms)
85
V (L1:1)
I (L1)
85
FIGURE 8. STEADY STATE SECONDARY WINDING
VOLTAGE AND INDUCTOR CURRENT
75
15
70
0
1
2
3
4
5
6
7
8
9
10
LOAD CURRENT (A)
FIGURE 10. EFFICIENCY vs LOAD V IN = 48V
10
12.5
12.25
5
12
0.986
0.988
0.990
0.992
0.994
0.996
0.998
1.000
TIME (ms)
V (L1:1)
I (L1)
FIGURE 9. SECONDARY WINDING VOLTAGE AND
INDUCTOR CURRENT DURING CURRENT LIMIT
OPERATION
11.75
11.5
11.25
Figures 8 and 9 show the behavior of the inductor ripple
11
0
1
2
3
4
5
6
7
8
9
10
under steady state and overcurrent conditions. In this
example, the peak current limit is set at 11A. The peak
current limit causes the duty cycle to decrease resulting in a
13
LOAD CURRENT (A)
FIGURE 11. LOAD REGULATION AT V IN = 48V
FN9147.8
September 22, 2005
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| VE-BTF-EW-S | CONVERTER MOD DC/DC 72V 100W |
| ISL6405I2C-KIT-EVAL | EVALUATION BOARD I2C ISL6405 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6744EVAL1Z | 功能描述:EVAL BOARD 1 FOR ISL6744 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6745AAUZ | 功能描述:IC REG CTRLR PWM VM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6745AAUZ-T | 功能描述:IC REG CTRLR PWM VM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6745AAUZ-TS2712 | 功能描述:IC REG CTRLR PWM VM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6745ALEVAL3Z | 功能描述:EVAL BOARD 3 FOR ISL6745 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
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