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| 型号： | ISL6740EVAL2Z |
| 厂商： | Intersil |
| 文件页数： | 19/28页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD 2 ISL6740 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 12V |
| 电流 - 输出： | 8A |
| 输入电压： | 36 ~ 75 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL6740 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
ISL6740, ISL6741
and line regulation performance are demonstrated in the
following figures.
15
10
V (L1:1)
I (L1)
100
95
90
85
80
75
70
0
1
2
3 4 5 6
7
8
9
LOAD CURRENT (A)
5
0.986
0.988
0.990
0.992
0.994
0.996
0.998
1.000
FIGURE 10. EFFICIENCY vs LOAD V IN = 48V t
TIME (ms)
FIGURE 9. SECONDARY WINDING VOLTAGE AND INDUCTOR
CURRENT DURING CURRENT LIMIT OPERATION
Figures 8 and 9 show the behavior of the inductor ripple 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 reduction of the average
current through the inductor. The implication is that the converter
12.5
12.25
12.00
11.75
11.50
11.25
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 3.32 Ω
current sense resistor was selected for the rectified secondary of
current transformer T2, corresponding to a peak current limit
setpoint of 16.5A.
The short circuit protection involves setting a voltage between 0
and 2V on the SCSET pin. The applied voltage divided by 2 is the
percent of maximum duty cycle that corresponds to a short
circuit when the peak current limit is active. A divider from RTC to
ground provides an easy method to achieve this. The divider
between RTC and GND formed by R13 and R15 determines the
11
0 1 2 3 4 5 6 7 8
LOAD CURRENT (A)
FIGURE 11. LOAD REGULATION AT V IN = 48V
14.0
13.5
13.0
12.5
12.0
11.5
9
percent of maximum duty cycle that corresponds to a short
circuit. The divider ratio formed by R13 and R15 is:
11.0
45
46
47
48 49 50 51 52
53
54
----------------------------- = ------------------------------------- = 0.068
R15 1.27k
R13 + R15 1.27k + 17.4k
(EQ. 24)
INPUT VOLTAGE (V)
FIGURE 12. LINE REGULATION AT I OUT = 1A
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
19
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.
FN9111.6
December 2, 2011
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6740EVAL3Z | 制造商:Intersil Corporation 功能描述:ISL6740 EVALUATION BOARD 3 - ROHS COMPLIANT - SOIC - DSL - Bulk 制造商:Intersil Corporation 功能描述:Power Management IC Development Tools ISL6740 EVAL RD 3 ROHS CMPL DSL |
| ISL6740IB | 功能描述:IC REG CTRLR PWM VM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL6740IB-T | 功能描述:IC REG CTRLR PWM VM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| ISL6740IBZ | 功能描述:电压模式 PWM 控制器 VOLT PWM MODE CONTRL 16LD NSOIC RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| ISL6740IBZ-T | 功能描述:IC REG CTRLR PWM VM 16-SOIC 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) |
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