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参数资料
| 型号： | ISL6558EVAL2 |
| 厂商： | Intersil |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD W/6605 DRVRS ISL6558 |
| 标准包装： | 1 |
| 系列： | Endura™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.35V |
| 电流 - 输出： | 30A |
| 输入电压： | 4.5 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | HIP6609，ISL6558 |
Application Note 1044
Figure 4 shows the efficiency for various frequencies and
airflow conditions.
As shown in Figure 6, the converter is disabled when the
control voltage (VCC5) is pulled below the POR falling
92
91
90
89
88
87
86
F SW = 465K, 200 LFM
F SW = 500K, 200 LFM
F SW = 500K, 0 LFM
threshold (3.88V nominal) of the ISL6558. The PGOOD
signal falls low indicating the output voltage is out of
regulation. The ISL6609 enters Tri-State? and holds both
upper and lower drive signals low. The L-C resonant tank is
broken and cannot cause negative ringing at the output
since the lower FETs are turned off, blocking any negative
current.
I OUT
85
5
10
15
Iout (A)
20
25
30
V IN =VCC5
FIGURE 4. EFFICIENCY FOR VARIOUS FREQUENCY AND
AIRFLOW AT V IN =5V
Different combinations of upper and lower MOSFETs have
been evaluated at Vin = 5V and Fsw = 500kHz with 200LFM
airflow, as shown in Table 5. The last combination with one
Hitachi HAT2164 upper FET and two Siliconix Si4842DY
lower FETs provides high efficiency and good thermal
performance with some space and cost reduction.
TABLE 5. EFFICIENCY WITH DIFF. UPPER & LOWER MOSFETs
V O
PGOOD
FIGURE 6. TURN-OFF WAVEFORMS
#
1
2
3
4
UPPER FET
HAT2168 x2
HAT2168 x1
HAT2168 x2
HAT2164 x1
LOWER FET
HAT2164 x2
HAT2164 x2
Si4842DY x2
Si4842DY x2
EFFICIENCY
89.85%
87.94%
89.50%
88.90%
TRANSIENT RESPONSES
A transient load generator is populated on the board to
evaluate the response of the converter at high-speed load
transients. Current setting of the generator provides about
6.5A load step with 160A/μs on the rising edge and 210A/μs
on the falling edge without output droop configuration.
OUTPUT SOFT-START AND TURN-OFF
As the control voltage VCC5 reaches the POR rising
threshold (4.38V nominal) of the ISL6558, the FS/EN pin is
released from ground; the output begins a monotonic rise
comprised of 2048 digital steps, as shown in Figure 4. At the
end of the soft-start interval, the PGOOD signal transitions to
indicate the output voltage is within specification.
V IN =VCC5
The input current rises/falls at a speed limited by the input
inductor and capacitors during step-up/step-down transients.
Figure 7 shows a very low ramping up speed (0.02A/μs) of
the input current at the load transient condition. This is due
to a large effective input inductance seen by the converter.
The effective input inductance is the sum of the on-board
input inductance and the inductance of the long source leads
of the bench power supply.
The transient performance at different operating conditions
has been summarized in Table 6. Little difference is noted for
various line and load conditions. Note that the ripple portion
has been included.
TABLE 6. TRANSIENT RESPONSE (6.5A STEP)
V O
PGOOD
FIGURE 5. SOFT-START WAVEFORMS
5
INPUT VOLTAGE/LOAD CURRENT
4.5V/0A
4.5V/25A
5.0V/0A
5.0V/25A
5.5V/0A
5.5V/25A
STEP-UP/DOWN
21.9mV/21.9mV
21.9mV/21.9mV
21.9mV/23.1mV
22.5mV/21.9mV
21.9mV/21.2mV
23.8mV/24.4mV
AN1044.2
April 4, 2006
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6559EVAL2 | EVALUATION BOARD 2 ISL6559 |
| ISL6562EVAL1 | EVALUATION BOARD ISL6562 |
| ISL6594BCRZ-T | IC MOSFET DVR SYNC BUCK 10-DFN |
| ISL6594DCRZ | IC MOSFET DRVR SYNC BUCK 10-DFN |
| ISL6596IBZ | IC MOSFET DRVR SYNC BUCK 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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) |
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