参数资料
| 型号： | ISL6421ER-T |
| 厂商： | Intersil |
| 文件页数： | 2/18页 |
| 文件大小： | 0K |
| 描述： | IC REG SGL LNB CONTROL 32-QFN |
| 标准包装： | 6,000 |
| 应用： | 转换器，卫星信号接收机顶盒设计 |
| 输入电压： | 8 V ~ 14 V |
| 输出数： | 1 |
| 输出电压： | 13 V ~ 18 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 带卷 (TR) |
Application Note 1083
Methods of Modulation
Quick Start Evaluation
‘0’ DATA BIT
‘1’ DATA BIT
Out Of The Box
The ISL6421/ISL6425 evaluation board is shipped in a
“ready-to-test” state. The board requires an input voltage
ranging from 8V to 14V and a 3.3V/5V supply. The use of an
electronic load enables evaluation over a wide range of
1.0ms 0 .5m s 0 .5m s 1.0ms
FIGURE 1. DiSEqC MODULATION SCHEME
operating conditions. The evaluation kit also includes 5
samples of the ISL6421ER/ISL6425ER, a PC to I 2 C bus
interface board (USB-I2CIO), PC to I 2 C bus software, a USB
cable, and a connector cable to connect the USB-I2CIO
board and the ISL6421EVAL1A/ISL6425EVAL2 board.
TABLE 1. ISL6421/ISL6425 EVALUATION BOARDS
‘0’ TONE BURST (SATELLITE A)
‘1’ DATA BURST (SATELLITE B)
BOARD NAME
ISL6421EVAL1A
ISL6425EVAL2
IC
ISL6421ER
ISL6425ER
PACKAGE
32 Ld QFN
32 Ld QFN
Required Test Equipment
12.5ms
FIGURE 2. TIMING DIAGRAM FOR TONE BURST
CONTROL SIGNAL
ISL6421/ISL6425 - Provides a Complete
Power Solution for LNB Control
The ISL6421/ISL6425 is a highly integrated solution for
supplying power and control signals from advanced satellite
set-top box (STB) modules to the low noise block (LNB) of
the antenna port. The devices are comprised of a current-
mode boost PWM and a low-noise linear regulator along
with the circuitry required for I 2 C device interfacing and for
providing DiSEqC standard control signals to the LNB.
The regulator output voltage is available at the output
terminal (VOUT) to support operation of the antenna port in
advanced satellite STBs. The regulator output for the PWM
is set to 13V or 18V by a voltage select command (VSEL)
through the I 2 C bus. Additionally, to compensate for the
voltage drop in the coaxial cable, the selected voltage may
be increased by 1V with the line length compensation (LLC)
feature. An enable command sent on the I 2 C bus provides
standby mode control for the PWM and linear combination,
disabling the output to conserve power.
The current-mode boost converter provides the linear
regulator with input voltage that is set to the output voltage,
plus typically 1.2V dropout to insure minimum power
dissipation across the linear regulator. This maintains
constant voltage drop across the linear pass element while
permitting adequate voltage range for tone injection.
Please refer to the ISL6421 datasheet (FN9130), or ISL6425
datasheet (FN9176), for more information.
2
To fully test the ISL6421/ISL6425 functionality, the following
equipment is needed:
? 4 channel oscilloscope with probes
? 1 electronic load
? 2 bench power supplies
? Precision digital multimeters
? I 2 C bus read/write capability
Power and Load Connections
The ISL6421/ISL6425 evaluation board has three sets of
terminal posts used to supply the input voltages and to
monitor and load the outputs.
Jumper Settings ISL6421 - JP1, JP2, and JP3 will be
shorted with shunt jumpers pulling the ADDR, SEL18V, and
the DISQIN pins low.
Jumper Settings ISL6425 - JP1, JP2 short V IN supply to V1
and Q1. JP3 short to set ADDRs low.
Input Voltage - Adjust two power supplies to provide the
5V/3.3V and 12V input voltages of the evaluation board.
With the power supplies turned off, connect the positive lead
of the 12V supply to the VIN post (P1) and the ground lead
to the GND post (P2).
The second supply set for either 5V or 3.3V provides the
pull-up voltage for the I 2 C bus clock and data line. Connect
the positive lead of the second supply to the +5V/+3.3V post
(P7)/ISL6421 or (P5)/ISL6425 and the ground lead to the
SGND post (P8)/ISL6421 or (P6)/ISL6425.
Output Voltage Loading and Monitoring - To exercise
and monitor VOUT, connect the positive lead of one of the
electronic loads and the positive lead of a digital multimeter
to the VOUT post (P3) and the ground lead to the GND
post (P4).
AN1083.1
May 6, 2005
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6422BERZ | IC VREG DUAL LNB W/I2C 40-QFN |
| ISL6422ERZ | IC VREG DUAL LNB W/I2C 40-QFN |
| ISL6423BEVEZ-T | IC VREG SGL LNB W/I2C 28-EPTSSOP |
| ISL6423ERZ | IC VREG SGL LNB W/I2C 24-QFN |
| ISL6424ER-T | IC REG DUAL LNBP TTL-INP 32-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6421ERZ | 功能描述:电流型 PWM 控制器 SINGLE LNBP SUPPLY CONTROL VG 32LD MLFP 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 |
| ISL6421ERZ-T | 功能描述:电流型 PWM 控制器 SINGLE LNBP SUPPLY CONTROL VG 32LD MLFP 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 |
| ISL6421EVAL1 | 功能描述:EVALUATION BOARD 1 ISL6421 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 |
| ISL6422BERZ | 功能描述:直流/直流开关转换器 DL LNB SUPPLY + CONT VAGEG W/I2C RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| ISL6422BERZ-T | 功能描述:直流/直流开关转换器 DL LNB SUPPLY + CONT VAGEG W/I2C RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。