参数资料
型号: ISL9491ERZ-T
厂商: Intersil
文件页数: 2/13页
文件大小: 0K
描述: IC REG SGL LNB CONTROL 16QFN
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: 13.3 V ~ 20 V
工作温度: -20°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-VQFN 裸露焊盘
供应商设备封装: 16-QFN-EP(4x4)
包装: 带卷 (TR)
ISL9491, ISL9491A
Functional Pin Description
SYMBOL
VSW
PGND
CS
SGND
TCAP
BYPASS
VCC
GATE
VOUT
VSENSE
EXTM
VSET0,
VSET1
EN
FAULT
ILIMIT
FUNCTION
Input of the linear post-regulator.
Dedicated ground for the output gate driver of respective PWM.
Current sense input; connect the sense resistor R SC at this pin for desired peak overcurrent value for the boost
FET.
Small signal ground for the IC.
Capacitor for setting rise and fall time of the output voltage. Typical value is 0.1μF.
Connect a bypass capacitor of 1μF for the internal 5V.
Main power supply to the chip.
This pin connects to the Gate of the Boost FET.
Output voltage for the LNB meant to be connected to the anode of a back diode in series with the LNB output.
This pin provides for a sensing and pull-down function for the VLNB and is meant to be connected to the cathode
of the back diode.
This is an input for externally modulated DiSEqC tone signal, which is transferred symmetrically onto VLNB.
Output voltage selection pins.
When this pin is low, the output is disabled in a low power standby state. Setting EN = 1 enables the output
voltage.
This an open drain output to be pulled up to the logic high through a resistor. A low indicates that the output
voltage is out of regulation.
The ILIMIT is used to set the value of the output current limit from the linear. A resistor from ILIMIT to GND
programs this limit.
2
FN6531.0
October 13, 2009
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