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參數(shù)資料
| 型號： | XC9510CSR |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector |
| 中文描述： | 同步降壓型DC / DC轉(zhuǎn)換器，配有LDO穩(wěn)壓器在加電壓檢測器系列 |
| 文件頁數(shù)： | 9/9頁 |
| 文件大?。?/td> | 116K |
| 代理商： | XC9510CSR |
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector
Preliminary
!
OPERATIONAL EXPLANATION (Continued)
< U.V.L.O. Circuit>
When the VIN pin voltage becomes 1.4 V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse output caused by
unstable operation of the internal circuitry. When the VIN pin voltage becomes 1.8 V or higher, switching operation takes place. By releasing
the U.V.L.O. function, the IC performs the soft start function to initiate output startup operation. The soft start function operates even when the
VIN pin voltage falls momentarily below the U.V.L.O. operating voltage. The U.V.L.O. circuit does not cause a complete shutdown of the IC, but
causes pulse output to be suspended; therefore, the internal circuitry remains in operation.
$
High Speed LDO Voltage Regulator
The voltage regulator block of the XC9510 series consists of a reference voltage source, error amplifier, and current limiter circuit.
The voltage divided by split resistors is compared with the internal reference voltage by the error amplifier. The P-Channel MOSFET, which is
connected to the VROUT pin, is then driven by the subsequent output signal. The output voltage at the VROUT pin is controlled and stabilized
by a system of negative feedback. A stable output voltage is achievable even if used with low ESR capacitors as a phase compensation circuit
is built-in.
< Reference Voltage Source >
The reference voltage source provides the reference voltage to ensure stable output voltage of the regulator.
< Error Amplifier >
The error amplifier compares the reference voltage with the signal from VROUT, and the amplifier controls the output of the Pch driver transistor.
<Current Limit Circuit>
The voltage regulator block includes a combination of a constant current limiter circuit and a foldback circuit. When the load current reaches the
current limit level, the current limiter circuit operates and the output voltage of the voltage regulator block drops. As a result of this drop in output
voltage, the foldback circuit operates, output voltage drops further and the load current decreases. When the VROUT and GND pin are shorted,
the load current of about 30mA flows.
$
Detector
The detector block of the XC9510 series detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or VROUT internally.
(N channel Open Drain Type)
<CE/MODE Pin Function>
The operation of the XC9510 series' DC/DC converter block and voltage regulator block will enter into the shut down mode when a low level
signal is input to the CE/MODE pin. During the shut down mode, the current consumption occurs only in the detector and is 0.6
μ
A (TYP.), with
a state of high impedance at the Lx pin and DCOUT pin. The IC starts its operation by inputting a high level signal or a middle level signal to the
CE/MODE pin. The input to the CE/MODE pin is a CMOS input and the sink current is 0
μ
A (TYP.).
The operation of the XC9510D to F series' voltage detector block will enter into stand-by mode when a high level signal is input to the CE/MODE
pin. The voltage regulator block will operate when a middle level signal is input. But when a low level signal is input, the voltage regulator block
will enter into stand-by mode. With the XC9510H to L series control can be PWM control when the CE/MODE pin is 'M' level and PWM/PFM
automatic switching control when the CE/MODE pin is 'H' level.
XC9510 Series
Semiconductor Ltd.
Data Sheet
9
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| XC9510CXXXSX | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter With Built-In LDO Regulator Plus Voltage Detector |
| XC9510D1333 | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter With Built-In LDO Regulator Plus Voltage Detector |
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| XC9510D1364 | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter With Built-In LDO Regulator Plus Voltage Detector |
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