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| 型号： | ISL6740EVAL2 |
| 厂商： | Intersil |
| 文件页数： | 14/28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 |
| 功率 - 输出： | 96W |
| 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 |
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ISL6740, ISL6741
coefficient (NTC) thermistor may be used. If a NTC is desired,
position R1 may be substituted.
The input voltage range is 48 ±10%VDC. The output is a nominal
12V when the input voltage is at 48V. Since this is an
unregulated topology, the output voltage will vary proportionately
V REF
R1
V REF
ON
25 μ A
with input voltage. The load regulation is a function of resistance
between the source and the converter output. The output is rated
at 8A.
Circuit Element Descriptions
The converter design may be broken down into the following
R2
R3
V REF/2
+
-
functional blocks:
Input Filtering: L 1 , C 1 , R 1
Half-Bridge Capacitors: C 2 , C 3
Isolation Transformer: T 1
Primary Snubber: C 13 , R 10
Start Bias Regulator: C R3 , R 2 , R 7 , C 6 , Q 5 , D 1
FIGURE 6. OTS HYSTERESIS
If a PTC is desired, then position R2 may be substituted. The
threshold with increasing temperature is set by making the fixed
resistance equal in value to the thermistor resistance at the
desired trip temperature.
V TH ↑ = 2.5V and R1 = R2 (HOT)
To determine the value of the hysteresis resistor, R3, select the
value of thermistor resistance that corresponds to the desired
reset temperature.
Supply Bypass Components: R 3 , C 15 , C 4 , C 5
Main MOSFET Power Switch: QH, QL
Current Sense Network: T 2 , C R1 , C R2 , R 5 , R 6 , R 11 , C 10 , C 14
Control Circuit: U 3 , R T1 , R 14 , R 19 , R 13 , R 15 , R 17 , R 18 , C 16 , C 18 ,
C 17
Output Rectification and Filtering: Q R1 , Q R2 , Q R3 , Q R4 , L 2 , C 9 , C 8
Secondary Snubber: R 8 , R 9 , C 11 , C 12
FET Driver: U 1
10 ? ( R1 – R2 ) – R1 ? R2
R3 = ----------------------------------------------------------------------
5
R1 + R2
Ω
(EQ. 11)
ZVS Resonant Delay (Optional): L 3 , C 7
Design Criteria
If the hysteresis resistor, R3, is not desired, the value of the
thermistor resistance at the reset temperature can be
determined from:
The following design requirements were selected:
Switching Frequency, Fsw: 235kHz
2.5 ? R2
R1 = -----------------------------------------
? R2
2.5 – 10
2.5 ? R1
R2 = -----------------------------------------
? R1
2.5 + 10
– 5
– 5
Ω
Ω
( NTC )
( PTC )
(EQ. 12)
(EQ. 13)
V IN : 48 ±10%V
V OUT : 12V (nominal) @ I OUT = 8A
P OUT : 100W
Efficiency: 95%
The OTS comparator may also be used to monitor signals other
than suggested above. It may also be used to monitor any
voltage signal for which an excess requires a response as
described above. Input or output voltage monitoring are
examples of this.
Ground Plane Requirements
Careful layout is essential for satisfactory operation of the device.
A good ground plane must be employed. V DD should be bypassed
directly to GND with good high frequency capacitance.
Typical Application
The Typical Application Schematic features the ISL6740 in an
unregulated half-bridge DC/DC converter configuration, often
referred to as a DC Transformer or Bus Regulator. The
ISL6740EVAL1 demonstration unit implements this design and is
available for evaluation.
14
Ripple: 1%
Transformer Design
The design of a transformer for a half-bridge application is a
straight forward affair, although iterative. It is a process of many
compromises, and even experienced designers will produce
different designs when presented with identical requirements.
The iterative design process is not presented here for clarity.
FN9111.6
December 2, 2011
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| ISL6405I2C-KIT-EVAL | EVALUATION BOARD I2C ISL6405 |
| ISL6405EVAL2 | EVALUATION BOARD 2 ISL6405 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6740EVAL2Z | 功能描述:EVALUATION BOARD 2 ISL6740 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 |
| 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 |
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