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ISL9492ERZ

更新时间： 2024-09-23 11:13:07
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英特矽尔 - INTERSIL 稳压器开关输出元件
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21页 1090K
描述
Single Output LNB Supply and Control Voltage Regulator

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ISL9492ERZ 数据手册

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Single Output LNB Supply and Control Voltage Regulator  
2
with I C Interface for Satellite Set-Top Box Designs  
ISL9492  
The ISL9492 is a highly integrated voltage regulator and  
Features  
• Single-Chip Power Solution  
interface IC specifically designed for supplying power and control  
signals from advanced satellite set-top box (STB) modules to the  
low noise blocks (LNB) of a single antenna port. It also supports  
DiSEqC tone generation and modulation with diagnostic status  
read-back. Controlling the ISL9492 is simple via the I C bus by  
writing 8 bit words onto the System Registers (SR).  
- Operation for 1-Tuner/1-Dish Applications  
- Integrated DC/DC Converter and I C Interface  
2
• Integrated Boost MOSFET  
2
• Switch-Mode Power Converter for Lowest Dissipation  
- 490kHz Boost Switching Frequency  
- Boost PWMs with > 92% Efficiency  
The device design makes the total LNB supply design simple,  
efficient and compact with low external component count by  
integrating Boost power MOSFET, current-mode boost PWM and  
a low-noise linear regulator. The current-mode boost converters  
provide the linear regulator with input voltage that is set to the  
final output voltages, plus typically 0.9V to insure minimum  
power dissipation across each linear regulator.  
- Selectable 13.5V or 18.5V Outputs  
2
- I C and Pin Controllable Output  
• 31V Output Back-Bias Capability  
• Built-in Tone Oscillator Factory  
- Facilitates DiSEqC (EUTELSAT) Encoding  
- Trimmed to 22kHz  
The LNB output voltage can be controlled in two ways; by full control  
- External Modulation Input  
2
2
from I C using the VTOP and VBOT bits or by setting the I C to the  
lower range and switching to higher range with the select VTOP pin.  
• DiSEqC 2.0 Support and Diagnostics  
The External modulation input EXTM accepts a modulated DISEqC  
command and transfers it symmetrically to the output. The EXTM  
pin can be used to modulate the continuous internal tone. The fault  
signal serves as an interrupt for the processor when any condition  
turns OFF the LNB controller (over-temperature, overcurrent,  
disable). The states of these flags to the faults can be thoroughly  
• Internal Overvoltage, Undervoltage, Overcurrent Protection,  
Over-Temperature Flags Accessible through the I C Interface  
and Fault Signal Status Pin  
2
• Short-Circuit Protection  
Applications  
• LNB Power Supply and Control for Satellite Set-Top Box  
2
examined through the I C registers.  
TXT  
TDOUT  
EXTM  
FLT#  
R1  
27  
21  
17  
16  
FLT#  
3.3V  
CPVOUT  
CPSWOUT  
CPSWIN  
C5  
100k  
C1  
0.047µF  
28  
1
SCL  
SDA  
SCL  
2.2nF  
SDA  
6
20  
25  
5
VCC  
C2  
1µF  
ISL9492  
C6  
10  
22  
4
LDO_SGND  
LDO_SGND  
ABYP  
DBYP  
TCAP  
NC  
0.1µF  
C4  
1µF  
C8  
0.22µF  
RL  
100  
C3  
1µF  
9
23  
PGND  
DGATE  
FERRITE  
BEAD  
Q1  
NDS356AP  
C9  
LNB  
POWER  
0.22µF  
L3  
Cp  
See pg 14  
C10  
0.1µF  
Rp  
L1  
L2  
220µH  
R2  
VIN  
D1  
CMS06  
100  
10µH  
1µH  
15  
C7  
C10  
100µF  
C11  
10µF  
100µF  
D4  
CMS06  
FIGURE 1. TYPICAL APPLICATION  
March 17, 2011  
FN6547.1  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. All Rights Reserved  
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.  
All other trademarks mentioned are the property of their respective owners.  
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