參數(shù)資料
型號(hào)： XC9503B093AR
廠商： TOREX SEMICONDUCTOR LTD.
英文描述： 2ch Step-down DC/DC Controller ICs
中文描述： 2通道降壓DC / DC控制器芯片
文件頁(yè)數(shù)： 7/30頁(yè)
文件大?。?/td> 405K
代理商： XC9503B093AR
Operational Description
<Error Amp 1, 2>
The Error Amplifier is designed to monitor the output voltage and it compares the feedback voltage (FB) with the reference
voltage. In response to feedback of a voltage lower than the reference voltage, the output voltage of the error amp. decreases.
<OSC Generator>
This circuit generates the Switching Frequency which in turn generates the reference clock.
<Ramp Wave Generator 1, 2>
The Ramp Wave Generator generates a saw-tooth waveform based on outputs from the Phase Shift Generator.
<PWM Comparator 1, 2>
The PWM Comparator compares outputs from the Error Amp. and saw-tooth waveform. When the voltage from the Error Amp's
output is low, the external switch will be set to ON.
<PWM/PFM Controller 1, 2>
This circuit generates PFM pulses.
Control can be switched between PWM control and PWM/PFM automatic switching control using external signals.
The PWM/PFM automatic switching mode is selected when the voltage of the PWM1 (2) pin is less than 0.2V, and the control
switches between PWM and PFM automatically depending on the load. As the PFM circuit generates pulses based on outputs
from the PWM comparator, shifting between modes occurs smoothly. PWM control mode is selected when the voltage of the
PWM1 (2) pin is more than 0.65V. Noise is easily reduced with PWM control since the switching frequency is fixed.
Control suited to the application can easily be selected which is useful in audio applications, for example, where traditionally,
efficiencies have been sacrificed during stand-by as a result of using PWM control (due to the noise problems associated with
the PFM mode in stand-by).
<Vref with Soft Start 1, 2>
The reference voltage, Vref (FB pin voltage)=0.9V, is adjusted and fixed by laser trimming (for output voltage settings, please
refer to page 8). To protect against inrush current, when the power is switched on, and also to protect against voltage overshoot,
soft-start time is set internally to 10ms. It should be noted, however, that this circuit does not protect the load capacitor (CL) from
inrush current. With the Vref voltage limited and depending upon the input to the error amps, the operation maintains a balance
between the two inputs of the error amps and controls the EXT pin's ON time so that it doesn't increase more than is necessary.
<Chip Enable Function>
This function controls the operation and shutdown of the IC. When the voltage of the EN1 or EN2 pins is 0.2V or less, the mode
will be chip disable, the channel's operations will stop and the EXT pins will be kept at a highlevel (the external P-type MOSFET
will be OFF). When both EN1 and EN2 are in a state of chip disable, current consumption will be no more than 3.0
μ
A.
When the EN1 or EN2 pin's voltage is 0.65V or more, the mode will be chip enable and operations will recommence. With soft-
start, 95% of the set output voltage will be reached within 10mS (TYP) from the moment of chip enable.
XC9503 Series
2ch. Step-down DC/DC Controller ICs
The XC9503 series are multi-functional, 2 channel step-down DC/DC converter controller ICs with built-in high speed, low ON
resistance drivers.
7
相關(guān)PDF資料
PDF描述
XC9503B095A 2ch Step-down DC/DC Controller ICs
XC9503B095AL 2ch Step-down DC/DC Controller ICs
XC9503B095AR 2ch Step-down DC/DC Controller ICs
XC9503 2ch.Step-Down DC/DC Controller ICs
XC9503_1 2ch.Step-Down DC/DC Controller ICs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XC9503B093AR-G 功能描述:IC REG BUCK ADJ 1A DL 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開(kāi)關(guān):900kHz 電流 - 輸出:100mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR
XC9503B093ARN 制造商:Torex Semiconductor LTD 功能描述:
XC9503B095A 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:2ch Step-down DC/DC Controller ICs
XC9503B095AL 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:2ch Step-down DC/DC Controller ICs
XC9503B095AR 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:2ch Step-down DC/DC Controller ICs
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