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參數(shù)資料
| 型號： | XC9511B146SRL |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| 中文描述： | 同步降壓型DC / DC轉(zhuǎn)換器內(nèi)置LDO的同時加電壓檢測器調(diào)節(jié)器 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 180K |
| 代理商： | XC9511B146SRL |
Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector
Preliminary
!
TYPICAL APPLICATION CIRCUIT
SD : XB0ASB03A1BR (TOREX)
CIN
: 4.7
μ
F x 2 (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
#
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 >
XC9511 Series
22
μ
H (CDRH6D28, SUMIDA)
1.2MHz
The DC/DC converter of the XC9511 series automatically switches between synchronous / non-synchronous. The Schottky diode is not
normally needed. However, in cases where high efficiency is required when using the DC/DC converter during light load while in non-
synchronous operation, please connect a Schottky diode externally.
The XC9511 series consists of a synchronous step-down DC/DC converter, a high speed LDO voltage regulator, and a voltage detector.
600kHz
300kHz
L
FOSC
4.7
μ
H (CDRH4D28C, SUMIDA)
10
μ
H (CDRH5D28, SUMIDA)
SOP-8 (TOP VIEW)
Semiconductor Ltd.
The XC9511A to C series are PWM control, while the XC9511D to F series can be automatically switched to PWM/PFM control.
The PWM mode of the XC9511A to C series are controlled on a specified frequency from light loads through to 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 XC9511D to F series can switch to PWM/PFM automatic switching control. 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. The series can not control only PFM
mode. 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.
1
2
3
4
8
7
5
6
AVDD
PVDD
AGND
LX
DCOUT
VROUT
VDOUT
PGND
VROUT
L
CL2
DCOUT
SD
CIN1
( )
CL1
CIN2
+
+
+
+
Data Sheet
8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XC9511B14C3 | 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 parallel plus Voltage Detector |
| XC9511B14C4 | 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 parallel plus Voltage Detector |
| XC9511B14CSRL | 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 parallel plus Voltage Detector |
| XC9511B14SRL | 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 parallel plus Voltage Detector |
| XC9511C1433 | 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 parallel plus Voltage Detector |
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