参数资料
| 型号： | ISL6844EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD 1 ISL6844 |
| 标准包装： | 1 |
| 主要目的： | 特殊用途 DC/DC，以太网供电（POE） |
| 输出及类型： | 1，隔离 |
| 功率 - 输出： | 11W |
| 输出电压： | 3.3V |
| 电流 - 输出： | 3.35A |
| 输入电压： | 36 ~ 57V |
| 稳压器拓扑结构： | 回扫 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL6844 |
Application Note 1192
ESR ≤ --------------------------------------------------------------------------------------------- = -------------------------- = 17.54m Ω
The ripple current handling capacity of the output capacitor
needs to be at least 2.85A at full load, the ripple being the
difference between the peak current and the maximum DC
load seen. To bring the voltage ripple down to less than
100mV P-P , the maximum ESR of the capacitor can be
calculated from EQ. 6below:
VoltageRipple 50mV
PeakCurrent – FullLoadCurrent 6.2 – 3.35
(EQ. 6)
A POSCAP was selected, to provide for variations in ripple
current and ESR over temperature, as also to account for
Typical Performance Characteristics
Typical performance waveforms are shown below, based on
measurements made on an ISL6844EVAL1Z Board.
Figure 1 shows a plot of efficiencies at different input
voltages. Based on these results, the efficiency target of
87% at typical loads was achieved.
Figure 2 and Figure 3 show the primary and secondary gate
drive signals that drive the respective FETs.
100
95
parasitic elements. A 10μF ceramic capacitor was added to
share the stress on the filter capacitor. Design margin has
been provided to account for noise spikes.
Feedback Network
The feedback is being tapped off the primary auxiliary
winding. This is one of the advantages of selecting the
flyback topology, since the auxiliary winding voltage follows
the output. This scheme was fully exploited, since the load
fluctuation is minimal, and that load regulation does not
90
85
80
75
70
65
60
55
36V
48V
57V
suffer much at these power levels (Load Regulation is shown
in Figure 6). For tighter regulation requirements, an opto-
50
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
coupled solution would need to be used, at the expense of
additional cost.
Additional Features
OUTPUT CURRENT (A)
FIGURE 1. TYPICAL EFFICIENCY
The Evaluation Board has the option of either directly
plugging into an ethernet jack, or using an external power
supply to provide the input power. It provides an additional
bridge-rectification circuit, and a diode that offers reverse
polarity protection in case the bridge-rectification is not used.
It also provides the user with the option of using a 10/100
Base (T3) or a Gigabit Network Ethernet Transformer (T4),
based on the end application. For convenience, the Gigabit
Network Ethernet Transformer is included as part of the
Evaluation Kit, but is not populated on the board. For users
with a Gigabit Network requirement, T4 will have to be
populated on the board, and T3 removed.
FIGURE 2. PRIMARY GATE DRIVE - Vgs of Q2
CONDITION: V IN = 48V, I OUT = 3.3A
3
AN1192.3
March 12, 2007
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| ISL8107EVAL1Z | EVAL BOARD FOR ISL8107 |
| ISL88550AEVAL1 | EVALUATION BOARD 1 ISL88550A |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6844EVAL1Z | 功能描述:EVALUATION BOARD 1 ISL6844 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 |
| ISL6844EVAL2 | 功能描述:EVALUATION BOARD 2 ISL6844 RoHS:否 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 |
| ISL6844EVAL3Z | 制造商:Intersil Corporation 功能描述:ISL6844 EVALUATION BOARD 3 - 8 LEAD - MSOP -ROHS COMPLIANT - Bulk 制造商:Intersil Corporation 功能描述:BOARD EVAL FOR ISL6844 |
| ISL6844IB | 功能描述:电流型 PWM 控制器 Single-End Current RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6844IB-T | 功能描述:IC REG CTRLR BST FLYBK ISO 8SOIC 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) |
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