ISL6558EVAL2【PDF 4/16 页】EVAL BOARD W/6605 DRVRS ISL6558

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录334

1页 2页 3页 [4页]5页 6页 7页 8页

Application Note 1044

Experimental Results

The ISL6558EVAL2 evaluation board as configured is

capable of 30A continuous load current and handling

200A/ μ s or higher speed load transients. The evaluation

board meets the design specifications indicated in Table 1.

Table 4 summarizes the equipment that was used for the

performance evaluation.

TABLE 4. EQUIPMENT LIST

? If there is sufficient airflow, use a single LPAK Hitachi

HAT1264 for the upper FET and two SO-8 Siliconix

Si4842DYs for the lower FETs in each channel; but it

comes with the penalty of 1% lower efficiency, as shown in

Table 5. Note that the current sense resistors (R2 and

R17) need to be adjusted to get a proper over current

setpoint.

? For 12V input operation, the jumper JP1 should be

removed to prevent the controller and drivers from

Equipment

Boards Used

Power Supplies

Oscilloscope

Multimeters

Load

Current Probe

Amplifier

Fan

EQUIPMENT DESCRIPTIONS

ISL6558EVAL2 Rev. A, #1 and #2

1. Hewlett Packard 6653A, 35V, 15A. S/N:

3621A-03425

LeCroy LT364L. S/N: 01106

Fluke 8050A. S/N: 2466115 & 3200834

1. Chroma 63103. S/N: 631030002967

2. Chroma 63103. S/N: 631030003051

LeCroy AP015. SN: 3293

POPST-MOOREN TYP 4600X (4098547)

overvoltage damage. A 5V supply is required to power up

the controller and the drivers; the diode D1 is to protect

both the drivers and controller from reversed-bias

damage. The 12V supply should be applied prior to the

5V; otherwise, the output voltage will lack soft-start and

cause an over overcurrent or overvoltage at the output.

Furthermore, the input capacitors should be replaced with

higher voltage rating (16V or above) capacitors. In

addition, the compensation gain (R11) should be scaled

by 5/12 for system stability with a reasonable phase

margin.

? Any change of the output filter will require the

compensation network to change for an optimum transient

response. If very lower ESR capacitors are used at the

output, a type III compensation network is required to

boost up the phase for a better transient performance.

? The feedback resistor (R19) can cause some delay in the

ISL6558EVAL2 OPERATION AND MODIFICATION TIPS

? Apply the input voltage (VIN) prior to the control voltage

VCC5 (5V). This sequencing results in initializing the

ISL6609 driver before the ISL6558 starts, and retains the

soft-start interval. Vice versa, the ISL6558 could produce

maximum duty cycle PWM drive signal, which results in an

overcurrent or overvoltage trip due to lack of soft-start.

The evaluation board is configured to power up from a

single 5V supply, and it eliminates the problem discussed

above.

? SW1 is used to engage or remove the load transient

generator.

? Droop option is not selected in the reference design since

soft-start interval, as discussed in the ISL6557A data

sheet section SOFT-START [3]. It should not be a very

high impedance resistor.

EFFICIENCY

The efficiency data, as plotted in Figure 3, are taken with a

PAPST-MOTOREN TYP 4600X fan turned on 8” away from

the input end of the evaluation board at room temperature

(approximate 200LFM). This figure shows that the converter

operates less efficiently at high line and low-to-medium load

since the switching loss is the dominant portion of the total

losses in that operating condition. As the load increases, the

dominant conduction losses help cut down the difference.

the required load transient step is not greater than 50% of

the full load. In another word, the droop only helps reduce

the number of output capacitors and still retains the same

transient performance when the load transient step is

greater than 50% of full load.

? For 3-phase operation, add the current sense resistor R17

and place JP4 to ON position (away from TP8). The

compensation gain (R11) should be scaled by 2/3 for

system stability with a reasonable phase margin.

4.5V

V IN = 5.5V

5.0V

? For 4-phase operation, add the current sense resistors R2

& R17 and place JP4 &JP2 to ON position (away from

TP8 and TP5). The compensation gain (R11) should be

Iout (A)

scaled by 1/2 for system stability with a reasonable phase

margin.

? Use R25, R26, R28, and R29 to program the load

transient speed. The higher values these resistors, the

slower the transient.

FIGURE 3. EFFICIENCY AT 500kHz AND 200LFM

AN1044.2

April 4, 2006

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

我的联系方式

相关代理商/技术参数

ISL6558IB 功能描述:IC REG CTRLR BUCK PWM 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:4,000 系列:- PWM 型:电压模式输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是升压:无回扫:无反相:无倍增器:无除法器:无 Cuk:无隔离:无工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘包装:带卷 (TR)

ISL6558IB-T 功能描述:IC REG CTRLR BUCK PWM 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:4,000 系列:- PWM 型:电压模式输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是升压:无回扫:无反相:无倍增器:无除法器:无 Cuk:无隔离:无工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘包装:带卷 (TR)

ISL6558IBZ 功能描述:IC REG CTRLR BUCK PWM 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)

ISL6558IBZ-T 功能描述:IC REG CTRLR BUCK PWM 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)

ISL6558IR 功能描述:IC REG CTRLR BUCK PWM 20-QFN 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:4,000 系列:- PWM 型:电压模式输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是升压:无回扫:无反相:无倍增器:无除法器:无 Cuk:无隔离:无工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘包装:带卷 (TR)

ISL6558IR-T 功能描述:IC REG CTRLR BUCK PWM 20-QFN 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:4,000 系列:- PWM 型:电压模式输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是升压:无回扫:无反相:无倍增器:无除法器:无 Cuk:无隔离:无工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘包装:带卷 (TR)

ISL6558IRZ 功能描述:IC REG CTRLR BUCK PWM 20-QFN 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)

ISL6558IRZA 功能描述:IC REG CTRLR BUCK PWM 20-QFN 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)

我
采购
搜索
会员

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式