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參數(shù)資料
| 型號： | XC9510 |
| 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)： | 7/9頁 |
| 文件大?。?/td> | 116K |
| 代理商： | XC9510 |
Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector
Preliminary
!
TYPICAL APPLICATION CIRCUIT
CIN
: 4.7
μ
F (ceramic, TAIYO-YUDEN)
CL1
: 10
μ
F (ceramic, TAIYO-YUDEN)
CL2
: 1
μ
F (ceramic, TAIYO-YUDEN), VROUT>1.5V
: 2.2
μ
F (ceramic, TAIYO-YUDEN), VROUT<1.5V
!
OPERATIONAL EXPLANATION
The XC9510 series consists of a synchronous step-down DC/DC converter, a high speed LDO voltage regulator, and a voltage detector. Since
the LDO voltage regulator is stepped-down from the DC/DC's output, high efficiency and low noise is possible even at lower output voltages.
$
DC/DC Converter
The series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase compensation circuit, output
voltage adjustment resistors, driver transistor, synchronous switch, current limiter circuit, U.V.L.O. circuit and others. The series ICs compare,
using the error amplifier, the voltage of the internal voltage reference source with the feedback voltage from the VOUT pin through split
resistors. Phase compensation is performed on the resulting error amplifier output, to input a signal to the PWM comparator to determine the
turn-on time during PWM operation. The PWM comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp
wave from the ramp wave circuit, and delivers the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle.
This process is continuously performed to ensure stable output voltage. The current feedback circuit monitors the P-channel MOS driver
transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback signals. This
enables a stable feedback loop even when a low ESR capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage.
< Reference Voltage Source >
The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.
< Ramp Wave Circuit >
The ramp wave circuit determines switching frequency. The frequency is fixed internally and can be selected from 300kHz, 600 kHz and 1.2
MHz. Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal
circuits.
< Error Amplifier >
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback voltage divided by the
internal split resistors. When a voltage lower than the reference voltage is fed back, the output voltage of the error amplifier increases. The gain
and frequency characteristics of the error amplifier output are fixed internally to deliver an optimized signal to the mixer.
< PWM/PFM >
L
FOSC
4.7
μ
H (CDRH4D28C, SUMIDA)
10
μ
H (CDRH4D28C, SUMIDA)
22
μ
H (CDRH4D28C, SUMIDA)
1.2MHz
600kHz
300kHz
XC9510 Series
SOP-8
(TOP VIEW)
The XC9510A to F series are PWM control, while the XC9510H to L series can be automatically switched between PWM control and PWM/PFM
control. The PWM mode of the XC9510A to F series are controlled on a specified frequency from light loads through the heavy loads. Since
the frequency is specified, the composition of a noise filter etc. becomes easy. However, the efficiency at the time of the light load may become
low.
The XC9510H to L series can switch in any timing between PWM control and PWM/PFM automatic switching control. The series can not
control only PFM mode. If needed, the operation can be set on a specified frequency; therefore, the control of the noise etc. is possible and the
high efficiency at the time of the light load during PFM control mode is possible. With the automatic PWM/PFM switching control function, the
series ICs are automatically switched from PWM control to PFM control mode under light load conditions. If during light load conditions the coil
current becomes discontinuous and on-time rate falls lower than 30%, the PFM circuit operates to output a pulse with 30% of a fixed on-time
rate from the Lx pin. During PFM operation with this fixed on-time rate, pulses are generated at different frequencies according to conditions of
the moment. This causes a reduction in the number of switching operations per unit of time, resulting in efficiency improvement under light load
conditions. However, since pulse output frequency is not constant, consideration should be given if a noise filter or the like is needed.
Necessary conditions for switching to PFM operation depend on input voltage, load current, coil value and other factors.
Semiconductor Ltd.
1
2
3
4
8
7
5
6
VDD
CE/
MODE
AGND
LX
DCOUT
VROUT
VDOUT
PGND
CIN
L
CL1
CL2
DCOUT
VROUT
SD
(
Data Sheet
7
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XC95103SR | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector |
| XC95106SL | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector |
| XC95106SR | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector |
| XC9510CSL | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector |
| XC9510CSR | Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XC9510_1 | 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 |
| XC9510_2 | 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 |
| XC95103SL | 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 In Series plus Voltage Detector |
| XC95103SR | 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 In Series plus Voltage Detector |
| XC95106SL | 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 In Series plus Voltage Detector |
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