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參數(shù)資料
| 型號： | XC910607 |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | PWM Control, PWM/PFM Switching Control, Step-up DC/DC Converters |
| 中文描述： | PWM控制，PWM / PFM切換控制，升壓DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 81K |
| 代理商： | XC910607 |
Preliminary
Operational Description
<Error Amp.>
Error Amplifier is designed to monitor the output voltage, comparing the feedback voltage (FB) with the reference voltage Vref. In
response to feedback of a voltage lower than the reference voltage Vref, the output voltage of the error amp. decreases.
<OSC Generator>
This circuit generates the internal reference clock.
<Ramp Wave Generator>
The Ramp Wave Generator generates a saw-tooth waveform based on outputs from the OSC Generator.
<PWM Comparator>
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 Controler>
This circuit generates PFM pulses.
The PWM/PFM automatic switching mode 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. Noise is easily reduced with
PWM control since the switching frequency is fixed. Because of the function, control suited to the application can easily be selected.
<Vref 1 with Soft Start>
The reference voltage of the XC9106/9107 series is adjusted and fixed by external applied voltage. (For output voltage settings, please
refer to the output voltage setting on page 6.)
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 error amp, the operation maintains a balance between the two inputs of error amps and
controls the EXT pin's ON time so that it doesn't increase more than is necessary.
The XC9106/9107 series alters soft start times by the setting value of reference voltage in order to protect against voltage overshoot and
also to protect against inrush current. Please determine soft start time by the formula equation.
TSS = 8.65 x Vref + 2.21
[Example Computation]
Vref = 0.9V, TSS = 8.65 x 0.9 + 2.21 = 10.0 ms
<Enable Function>
This function controls the operation and shutdown of the IC. When the voltage of the CE pin drops to 0.2V or less, disable mode will
be entered, the IC's operations will stop and the EXT pin will be kept at a low level (the external N-type MOSFET will be OFF) . When
the IC is in a state of chip disable, current consumption will be no more than 1.0
μ
A.
When the CE pin's voltage rises to 0.65V or more, enable mode will be entered and operations will recommence. The CE pin also
doubles with reference voltage in the XC9106/9107 series, and the range of reference voltage can be varied externally from 0.8V to
2.5V.
5
The XC9106 / 07 series are reference voltage (Vref) apply external step-up DC/DC Controler ICs. Output voltage will be set with external
resistors (RFB1 and 2) and Vref value. The series make it easy to control output voltage externally and are suited to software applications
that need to vary voltage such as LCD power supply for PDA.
Externally Applied Reference Voltage (Vref)
XC9106 / 07 Series
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
XC9106 / XC9107D xxx MR
0
5
10
15
20
25
30
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Reference Voltage Vref (V)
S
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XC9106 | PWM Control, PWM/PFM Switching Control, Step-up DC/DC Converters |
| XC9107D3MR | PWM Control, PWM/PFM Switching Control, Step-up DC/DC Converters |
| XC9107D1DL | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT08; Number of Contacts:3; Connector Shell Size:8; Connecting Termination:Solder; Circular Shell Style:Right Angle Plug |
| XC9106D | PWM Control, PWM/PFM Switching Control, Step-up DC/DC Converters |
| XC9107D | Capacitors, Ceramic Disc & Plate; Capacitance:200pF; Capacitance Tolerance: 5%; Series:CEC; Voltage Rating:50VDC; Capacitor Dielectric Material:Ceramic; Termination:Radial Leaded; Dielectric Characteristic:NP0 RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XC9106D | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:PWM Control, PWM/PFM Switching Control, Step-up DC/DC Converters |
| XC9106D1DL | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:PWM Control, PWM/PFM Switching Control, Step-up DC/DC Converters |
| XC9106D1DR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:PWM Control, PWM/PFM Switching Control, Step-up DC/DC Converters |
| XC9106D1ML | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:PWM Control, PWM/PFM Switching Control, Step-up DC/DC Converters |
| XC9106D1MR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:PWM Control, PWM/PFM Switching Control, Step-up DC/DC Converters |
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